Question on switching heads and such

Well im going t buy an si head and throw it on my dx block i dont need the ecu right? i know i need the ecu if i convert it to multi point but what if im not going to do that, can i just buy the head and thats it? Also if i replace the head with a rebuilt head o miles then isnt that almost like the engine is rebuilt because there are not many problems from the block like ever so tell me what anyone thinks about that also :screwy:

if i were you i would just save up for a B16 and do the conversion yourself. It's really not worth it to do the head swap on the DX.

peace

nah dude, see i overheated my dx therefore im pretty sure i fucked the head over royaly i just need to get a new head so i can slap it on and SELL it!!!!!!!!

I've had funny oil burning problems when I put a rebuilt head on a block with only 100k on it. It was a 86 civic, but I was told by a mechanic that the combination of new the new head parts and the old rings creates higher compression, and that somehow causes oil to get past the old rings.

I know that sounds funny, but it happened to me.

If I were you, I would try to get a used head from a junkyard that has close to the same milage on it, and slap that on.

I've had funny oil burning problems when I put a rebuilt head on a block with only 100k on it. It was a 86 civic, but I was told by a mechanic that the combination of new the new head parts and the old rings creates higher compression, and that somehow causes oil to get past the old rings.


yup...this is a very common problem when the head is rebuilt and the rings are left alone.. rings must always be done when putting new valve springs, seals, etc...

nah dude, see i overheated my dx therefore im pretty sure i fucked the head over royaly i just need to get a new head so i can slap it on and SELL it!!!!!!!!
along with what marked001 said i would also like to add...

when it over heats not just the head gets fucked. the bottom end can warp as well. if the bottom is warped and you stick a different head on (rebuilt or not) you take the chance of the gasket not sealing. you would have better luck sticking the warped head back on...at least it's warped the same. BUT...why would you want to rebuild a warped head to stick back on a warped block. LMAO

throw it in the gutter...go by another. in the words of dropshop "d stands for disposable"

Hi, Lisa.
I've spent the last three weekends installing a used head on my 86 Integra, which is a D16A1 motor...except for DOHC, it's the same as yours (minus a few ccs).
After working my ass off getting the old one off and putting the other head on, I don't think it was worth the time and effort.
I spent $200 on gaskets(Head gasket, intake and exhaust gaskets), new water pump, timing belt, heater hoses, etc. Plus the $150 I spent for the used head (they are hard to find, so I had to take what I could get.)
Now that I've found one in a junkyard, I could have bought an entire motor for $200...plus $50 for a water pump, $40 for a timing belt...
Anyway, because the gaskets are so costly, you could install an entire engine for the same price.
Plus, you could be done swapping one D-series motor for another one in a day...instead of screwing around for six days trying to replace frickin' head.
Flunky
PS-I paid extra for Beck Arnley gaskets...they cost a bit more than what Autozone had in stock, but a little extra money for critical parts is worth it, in my opinion.

You can keep the DX ecu if you do the MPFI swap and install a resistor box.
The SIs do indeed have a different ECU, and you'll want it eventually.
Flunky

hmmm well i guess i should replace the whole engine then it had like 207k miles anyway its tims to put her to rest hehe

anyone want to sell me their si or dx engine!!!!!!!!!!!!

along with what marked001 said i would also like to add...

when it over heats not just the head gets fucked. the bottom end can warp as well. if the bottom is warped and you stick a different head on (rebuilt or not) you take the chance of the gasket not sealing. you would have better luck sticking the warped head back on...at least it's warped the same. BUT...why would you want to rebuild a warped head to stick back on a warped block. LMAO

throw it in the gutter...go by another. in the words of dropshop "d stands for disposable"
so true, i warped the block and head when i blew my head gasket last year. i just replace the whole engine with one from attarco in berekley ( engine was $275) if you need one right away i would go to them, i think its only like $225 now... they are low mileage replacement japanese motors...

hmmm well i guess i should replace the whole engine then it had like 207k miles anyway its tims to put her to rest hehe

anyone want to sell me their si or dx engine!!!!!!!!!!!!
You can have my ZC SOHC for $25,000! Nah, make it $30,000.

If you do put a head on, check the engine block with a true-bar, there should be no more than .002 gap. Not much room to mess with. Fuck a 4-banger, throw a 5.7L LT1, LT4, LS1 in it.

so true, i warped the block and head when i blew my head gasket last year. i just replace the whole engine with one from attarco in berekley ( engine was $275) if you need one right away i would go to them, i think its only like $225 now... they are low mileage replacement japanese motors...

thats cool and everything but arent you having problems smogging now?

thats not the engines fault. its my cat being dead..im 99% sure. the engine you buy from them is basiclly just the block and head, no dizzy, intake manifold, exhaust manifold, etc..

You can keep the DX ecu if you do the MPFI swap and install a resistor box.
The SIs do indeed have a different ECU, and you'll want it eventually.
Flunky



judges??? WRONG. sorry, the DX ECU is made to fire 2 non sequential injectors. It doesnt have the capacity to use a cylinder position sensor, crank angle sensor, or fire 4 injectors; sequential or not.

bottom line... MPFI with a PM5/PM9 ECU will run on two cylinders. I know this from personal experience, back when i didnt have a clue about that kind of stuff.

I cannot speak from experience in this matter.
I haven't done the MPFI swap, although I very seriously considered it. I even bought the intake manifold for it, but sold it to another member when I needed cash.
I was going by the "How-To" information here:

http://www.4thgenerationcivic.com/

on Ami's site. I didn't see anything there which said you needed to upgrade the ECU as well.
Flunky

i can get u a s1 crx head 4 $25....but u'd have to pay 4 shipping

I cannot speak from experience in this matter.
I haven't done the MPFI swap, although I very seriously considered it. I even bought the intake manifold for it, but sold it to another member when I needed cash.
I was going by the "How-To" information here:

http://www.4thgenerationcivic.com/

on Ami's site. I didn't see anything there which said you needed to upgrade the ECU as well.
Flunky
you 100% need the ecu. yes you need to change the resistance (which is why you need a resistor box). but that only deals with the impedance the injector is running off. i'm trying my best to put this in easy to understand terms. the ecu controls the flow thru the injectors.

with DPFI the gas flows in and goes to each port (2 of them...making it dual ;) ) as needed. the ecu isn't controling the flow. with MPFI the gas is delivered at a predetermined flow to each injector...which is ran by the ecu.

shoot, did that make sense? i tried to make sense, LOL!

im actually not going this route anymore (just buying a head im almost positive the block has to be warped my boyfriend drove this thing until it shut itself down from overheating cuz hose came loose and all water drained :eek7: anyway hes not a dumbass he has no liscence and there was a cop behind him, no way he wanted the cop to stop

anyway i think what i meant was i wanted to put an si head on a dx block running it dpfi and dx ecu, and wanted to know if that would work because im just trying to get it running as cheaply as possible to sell the focker

itll work fine. but you need to make sure the block isnt warped.