Compression Ratios...

Just curious, how would you go about lowering the compression ratio on a motor. Head gaskets? Is there anything else involved? I believe the comp. ratio on my 305 is 9:5:1, would it be possible to drop it? Say aroun 9 or 8 possibly?

Link, why in the world would you want low compression? Plan on getting in the geo metro class at the stirp?

Or he could be going in the other direction with a 30lb boost twin turbo set up.

Anyway, you should be able to drop the comp ratio by just finding new pistons.

HAHAHAHAHA!!!! Wrightz28, that's some funny sh**!!! No but stieh2000 is correct. Ding, ding, ding!!! I'm gonna boost the 305 during or after school. I already know the school is gonna go over things like this, but i wanted to ask here 1st, just to get an idea on how to do so.

C'mon Link, go higher compression, N/A with with a nice cam and shake some fillings loose.

flatter piston heads

I don't know how far i would get with the 305 N/A, but with money anything is possible. But with some boost, i can get some numbers i believe i'm looking for with some ease, with the proper knowlegde of course. I'm not going the "drop a bigger motor route" as i've already had plenty of chances to do so. I'll see wrightz28, just don't think i can get that far with it that way, but the idea about it is astounding!! Pull up next to a Z06 and shake his ass loose.
Z06 guy: "What you got there is that POS?"
Me: "305 Baby!!!!"
Z06 guy: "Ready for some new school, door blowing action?"
Me: "I don't think so pal"
And i proceed to but buslengths on the Z06. (Hey, we have the right to dream, right?)

Ok, but what's the practicality in this? How many times do you see a Z06, ta say anything about the opportunity to try and take it down?

just hate seing people start projects like this, get in way over their head and the car just sits and sits, then life catches up on you, you get older, get married, have kids, and either spend all your time updating your house, and worst case: wife is tired of looking at your scrap heep that all the old baby items area packed in boxes on top of and wants it gone.

Next thing you know, your cruis'n in a 4 door, a cool ride goes by with a nice exhaust tone, you shed a tear and start to feel nostalgic about your old ride.

Ok, but what's the practicality in this? How many times do you see a Z06, ta say anything about the opportunity to try and take it down?

just hate seing people start projects like this, get in way over their head and the car just sits and sits, then life catches up on you, you get older, get married, have kids, and either spend all your time updating your house, and worst case: wife is tired of looking at your scrap heep that all the old baby items area packed in boxes on top of and wants it gone.

Next thing you know, your cruis'n in a 4 door, a cool ride goes by with a nice exhaust tone, you shed a tear and start to feel nostalgic about your old ride.

No one asked for your life story...

Aint my life story, my backwards little firend.

Backwards? The hell you mean?

Wrightz28, you are scaring me man. I'll do this btw. I just need the knowledge, know how, tools, and funds to do these things. I don't plan on having kids no time soon (knock on wood), plus, while in school if you have good grades and perform well, you can make your car or whatever a free project. Choose who you want and what not, pretty neat. I'm definitely down for completing things i have started. I'm not startin it now, cause i gotta worry about school. Something i definitely wanna/will do in the future. Long term project.

Alright, Jim's floating around here somewhere, he knows what i mean.

as bad as it is, i'm sure that happens quite often. school is a good idea, i get a ton of money to go to school, and it's to be spent on things i need for school, transportation!

dish top pistons are one way... thicker head gaskets... cylinder heads with larger combustion chambers... etc

as bad as it is, i'm sure that happens quite often. school is a good idea, i get a ton of money to go to school, and it's to be spent on things i need for school, transportation!

HAHAHAHAHA!!! Great minds think alike!! I actually need for car for school aswell. Where i'm at i will need transportation, so that why i did all i did for the IROC. Just giving her some TLC, and she better treat me the same!!!

exactly! gotta have transportation to school

btw, the best part is all the af members are funding us! haha, i love taxes lol

Probably save money swapping in a used LS1/LT1. Add cam.

Probably faster that way as well.
Just because you pump in a ton of boost doesn't mean the motor is going to be able to use it well. You need to redo EVERYTHING on that 305 before adding boost.

I had previously thought of boosting my 305, and hypsi said that the head gaskets are the weakest link and I shouldn't go with thicker gaskets, pistons and or larger chambered heads are the way to go. depending on how much boost you want to run will determine whether or not you need to beef up the internals (forged crank, rods, pistons, etc..). 6-7 psi i believe will be ok with stock setup.

6-7 psi i believe will be ok with stock setup.
This depends on the compression. More boost can be ran with lower compression.

I was actually refering to all of the valvetrain, not the shortblock itself. They don't flow well enough to make boost worth it.
Good idea...yes.
Realistic for cheap...no.

Oh, I know the entire motor would have to be rebuilt and wouldn't be cheap aswell. This is gonna be a long term project. I know it would be cheaper to swap in a bigger motor (LT1/LS1), but i'm not tryin to recieved over night power and this is not something thats needs to be done right away. I, as a person, want to see what this little 305 is capable. I know it's the underdog of smallblocks and i always here "you should swap this and that in there instead. I'm not worry about cost (again, long term project that i'm not jumping into until i have a decent amount of knowledge on required subjects), as i have to worry about school and getting a decent paying job when i get out. I will do this, for the fact that motor is an underachiever in other people eyes and i believe that it has potential, as with any other motor, just not as cheap. You guys are all like family to me, and i appriaciate the fact that you look out for me and stuff, but this is just something i gotta do. My grandfather was in a similar situation once. And he shocked everyone with his results. Gonna fill his shoes again.

Hm.. If I had to fill anyone in my family's shoes it would have to be my step father.. but then that would mean that I would goto police stations and steal v8 cop engines overnight..

HAHAHAHAHA!!! Thats awesome. That is awesome. He's got some big balls to do that.

Well basicly he would go with a truck, him and his brother sometimes and others alone and would sneak in take about an hour or so just taking out the engine.. drive back to the house and then the next day the engine would be inside of his 2nd gen Camaro and over the weekend he would race it at the drag strip.. yup.

Well basicly he would go with a truck, him and his brother sometimes and others alone and would sneak in take about an hour or so just taking out the engine.. drive back to the house and then the next day the engine would be inside of his 2nd gen Camaro and over the weekend he would race it at the drag strip.. yup.

ah ha, I hope you removed your location from teh AF map before the po po comes and kicks your door in.

HAHAHAHAHAHA!!!! OMG!!! Your is uncle is da man!!! Yeah, i'd stop talking about too. Don't wanna see your house be broken into by cops on the 10 o'clock news for conspiracy to take police engines.

. You guys are all like family to me, and i appriaciate the fact that you look out for me and stuff,

awwwwwww :crying:

Link, i admire you determination, but for the cash involved..... You ever see the movie Christine? Anyway there's two old guys sitting there talking about Arnie, who was obsessed with the car and rebuilding (real bitch part was a little while later he finds out the car can rebuild it'self) but one guy makes a pont of how spedtarded Arnie works, putting new wipers on a busted windsheild. Follow?

That is a scary ass movie, i've had nightmares about it. It's the elvis caddy that goes around killing people in the worst ways? I've seen cars driving with no people in them. I gotta leave the angel dust alone man. I completely understand ya Wrightz. I'm not just gonna find some turbos, slap them on and think i'm speed racer like some people (i've gotta a freind who told me that if you put just a borla exhaust w/ "borla chip" yes "borla chip", you'll have over 500rwhp on WS6, these kinda people are out there). This is something that will be thoughly planned and thought out. I know it can be done and it will be done. As of right now, i'm satisfied with my 3slow5. I love it. Definitely the perfect stepping stone for people who have never driven cars that havethe power to throw into the sidewalk if you don't know what you're doing (has already happened to me, thank God she's OK). Now, i'm just gonna worry about school and finishing it, and getting a good job when i get out of school. Then i can start my project, however long it takes. i'll probably get a spare LB9 block for nothing and start from there. It'll be done. If i'm still alive in a few years, i'll be posting the project as its going on. I really appreciate your kindness Wrightz28, you kinda remind me of my father, and he's great man.

I'm kinda interested in what you grandfather did?

Well he used to race his chevy wagon at New England Dragway back in the late 70's early 80's. His nick name was cool breeze and his car was called something like, super mouse, super mini mouse, i gotta asked my father. Anyways, he and a bunch of his racing buddies used to go there and compete against one another. All his buddies used big blocks , while he only used a mere 350 small block. But it's they way he did things with the small block that had him destroying all the big blocks. He just had the "knack" for this stuff. I really wish i had the chance to meet him, would of been able to learn alot of things from him. He did most the stuff by hand, like port and polishing the intake and exhaust ports, at 2am in the morning. Pure dedication. His buddies had nitrous powered motors and still couldn't hold a candle to his N/A. The one thing that stood out the most that my pops told was one night, some idea just popped up in my grandfathers head. So he went over to a home supply store and bought about $20 worth of items and built a spacer for the carb. The amazing part, no bullshit, was when he went to dyno the motor. He picked up 52hp from that spacer that he made. A-fu**in-mazing!!! I really wanted to meet this him, now i see where i get some of this stuff from. It's in the blood. Also, the car was an 83 Chevy Wagon (big car, looks like a caprice) had about 650hp and ran low 10's. He was ahead of his time, because he didn't have much money like some of the big dogs who he went up against that he was beating. Pretty amazing guy.

man that's a great story. I hope you pull off the 305 build, it would be awsome to have a hefty 305 around here. I'm getting an ls1 as soon as I can afford it, it's just too much money for me to build a 305. Did you ever figure out your gear ratio, I saw where you posted over at thirdgen?

That is a scary ass movie, i've had nightmares about it. It's the elvis caddy that goes around killing people in the worst ways?

twas a '57 Plymouth Fury Damn I wish I could upload pics, I have one of it when I went up to the auto museum last.

a borla exhaust w/ "borla chip" yes "borla chip"

Shit! I forgot to put the chip in, nowonder why it didn't work right :wtf:

. I really appreciate your kindness Wrightz28, you kinda remind me of my father, and he's great man.

i'm just a say like it is type person. And I know you're not expecting to just turn a bolt here or there and be done, you've come a long way in short time. :thumbsup:

His nick name was cool breeze

:spit:

haha, we had cool breeze too. He was this bum that rode the subway all the time, drank maddog 20/20 pissed it in the bottle and drank it again. Nasty ass shit, but after a while, meh, that's just cool breeze man. :lol:

Haven't heard that name in years.

Speaking of hefty 305's, I'm hoping pretty soon to get back to work on mine, do a lttle cam dance and go from 275 to hopefully somewhere in the 290's, but again quite a bit of torque (50 ft lbs) :D

man that's a great story. I hope you pull off the 305 build, it would be awsome to have a hefty 305 around here. I'm getting an ls1 as soon as I can afford it, it's just too much money for me to build a 305. Did you ever figure out your gear ratio, I saw where you posted over at thirdgen?

Not yet. I still gotta but all that crap on my car now that I have everything. Just been really cold lately. I mean COLD!!! I will test it as soon as i get THE ROC on the road, i will see what i have. I've thought about LT1/LS1 plenty of times already, but i really appreciate this motor, i kinda like be the underdog.

i'm just a say like it is type person. And I know you're not expecting to just turn a bolt here or there and be done, you've come a long way in short time.

Thanks man. I love this place. It can be a very good environment (except when we get some trolls in here). I've learn you gotta read, research and get your facts stright before you jump the band wagon. I know people who think the do one thing and all of the sudden you have an Enzo (borla chip kid). I guess thats what happens to certain people who have mommy buy them $10000 car for nothing (not addressed to all who have parents who do this, just him). He's what we call a modest prick.

What was the thridgen ? on ratios?

i don't like posting there, people get realy conceeded and fussy on how you word things. I just go for the classifieds and local boards.

:spit:

haha, we had cool breeze too. He was this bum that rode the subway all the time, drank maddog 20/20 pissed it in the bottle and drank it again. Nasty ass shit, but after a while, meh, that's just cool breeze man. :lol:

Haven't heard that name in years.

Speaking of hefty 305's, I'm hoping pretty soon to get back to work on mine, do a lttle cam dance and go from 275 to hopefully somewhere in the 290's, but again quite a bit of torque (50 ft lbs) :D

ROFLOL!!! Thats funny as hell. He even had T-shirts and hats. Had some fans i guess. Good to here your Z's is getting back on the road.

Oh.. well just to let you guys know he did this back at my old town and stuff, also he doesnt live with us anymore and it was my step dad.

don't know about back on the road. I need a distributer in a bad way.

Sorry about that Rally. Hope i didn't get carried away. Btw wrightz28, i thought you got the distributor at the swap meet? Has your car been started since then?

No the day before the swap, I yanked it to see what I had to work with. Nobody had a electric adv. stock dist., they were all vacuum. At the swap I got a the MAF and a extra snorkel with it for $20. Man even the snorkel you can't find for less than $30.

So I put the dist. back in with a extra ign. module, coil and rotor. Started a million times, ran, drove once then parked so the salt wouldn't eat it, plus I yanked insurance on it for the winter.. Wen't to move for snow removal and it was pulling it's horseshit again, haven't touched it since (month?)

Damn, that sucks monkey balls. So do you still think it's the dist.? I remember when I 1st got my car, it started everytime and ran perfectly on the way home. As soon as i got to the house (all the way from NH), she started pulling and jerking like shit, like she was going into shock. Couldn't figure out what the dam problem was. Pulled the plugs, and they beyond fouled out. Must of been the original plugs (not really, but damn they were old). I know you've already checked the plugs, so what is wrong with the dist.?

Bad shaft bushing. So it hops all over the damn place unit the rotor finally twacks the carbon tabs in the cap, grounds it out and fries the coil's carbon button and then poof, terrible spark.

Damn, that stinks. So you have to get one from an '85 Tpi? Can you get an aftermarket dist.? Shouldn't be as much as an OEM one, i think.

All i keep running across is vacuum advance. I did find one that was elec. but it was WAAY out of line on price. You'd think somebody would have one laying around :unno:

Well, hopefully something pops up for ya dude. That way you can have your baby back on the road.

Actually i'm not even really worried about it anymore. I'm hoping that the job I applied for falls in to place, then I'll be a 10 minute drive to work, in a provate lot, where nothing is around anyway. That way I can park the Z while while I finally drive my Rambler American after a 6 year coma. With the Z in it's place, I'll be able to get a bit accomplished on it.

Nice. Hope you get the job man.

Oh yeah, out of the ghetto. Luckily my car ahs been 150% reliable and not left me starnded. Cuz I've seen cars that broke down in the morning, and by the evening commute are frames on cinder blocks, no lies. It's getting better but damn, in broad daylight, nobody stops to wonder what the hell is going on.

But yeah almost 7 years, 2 batteries, 1 alt. and brakes. Times it did somewhat let me down, fuel pump but that wasnt' so bad cause it was right in front of my house. And then the crank sensor system that was altered for my by some little prick. But that let loose just as i got to work, and made it home half assed together. Buicks, I'll endorse the hell out of em. For a 20 year old car can't complain, oh that's right I rebuilt it when I bought it :D

Now i probably just cursed myself for the ride home.....

Part that will suck aobut the new job, i'll actually be working and not pissing the day away here looking like I'm working.

Our cars have been through a lot. I might not be able to post on here that much once i go to school. There are no computers for lolly gagging, but i'll try and find a way to post.

Link, why in the world would you want low compression? Plan on getting in the geo metro class at the stirp?
possibly turbo or supercharger, they dont like high compression

Nah, you have a computer room, you have to becasue they watn to expose you to Mitchell and Alldata. You just need to be sneaky to get internet access. But the general rule of thumb was as long as it was sutomotive related it's fine. Plus I'm paying for the damn thing anyway so wtf?

possibly turbo or supercharger, they dont like high compression

We covered that already. Then the thread kind of took off from there. But it's Links thread.

Hey, it's all good. Been covered already babs. And wrightz28 you are right, there is a computer and this is automotive relative so it'll work.

Oh, I know the entire motor would have to be rebuilt and wouldn't be cheap aswell. This is gonna be a long term project. I know it would be cheaper to swap in a bigger motor (LT1/LS1), but i'm not tryin to recieved over night power and this is not something thats needs to be done right away. I, as a person, want to see what this little 305 is capable. I know it's the underdog of smallblocks and i always here "you should swap this and that in there instead. I'm not worry about cost (again, long term project that i'm not jumping into until i have a decent amount of knowledge on required subjects), as i have to worry about school and getting a decent paying job when i get out. I will do this, for the fact that motor is an underachiever in other people eyes and i believe that it has potential, as with any other motor, just not as cheap. You guys are all like family to me, and i appriaciate the fact that you look out for me and stuff, but this is just something i gotta do. My grandfather was in a similar situation once. And he shocked everyone with his results. Gonna fill his shoes again.
Sorry to bring this back from page 2, but....

The main problem with the 305 is the bore I believe. There isn't any.
Anything is possible. I just would rather see you happy with all that money and work into the car instead of disappointed.

I have faith in you Link, I think you can make one hell of a beast out of that 305 and I'd be more than happy to advise you on any ideas.

Thanks Geno. It's gonna be one helluva ride when it's done, whenever that is...