my b16 compression

[2poor2tune]

ok i did a compression check on my b16a and this is what it read.
1-10.9
2-11.2
3-12.0
4-12.0

tell me what this means. is it a bad motor or what?

[2poor2tune]

well there was 2 different readings on the guage. so the other would be around 178 or 175 all the way across. i rechecked them. so does this mean the motor is good

[bambam89lx]

Originally Posted by 2poor2tune

well there was 2 different readings on the guage. so the other would be around 178 or 175 all the way across. i rechecked them. so does this mean the motor is good

that does seam a little low. but do NOT worry. You're motor does seem like it's in excellent shape by how close the comression is in each cylinder.
You can't got by the "numbers"...you just have to maker sure each cyllinder is withing 15 psi of each other. Every compression tester is different so you can't relate your results to someone else's motor unless you test another motor with the same compression tester, and do it the same way (turn it over the same amount of times).
You're good man.

[2poor2tune]

yes. thats all i wanted to hear. its even better to hear it from you. i can trust you. you seem like you know alot. so tell me why my car aint starting up. i have spark for sure and fuel for sure. i did do you mulit point swap to it but it is getting fuel to each cylinder and spark. im pretty sure i have the firing order correct. 1342 from the bottom left side of the dizzy. i dont know what to do. i might sound like an idiot but can i just turn it over without a exhaust manifold on. just to see if it will start. or will it not start?

[turtlecrxsi]

Originally Posted by 2poor2tune

yes. thats all i wanted to hear. its even better to hear it from you. i can trust you. you seem like you know alot. so tell me why my car aint starting up. i have spark for sure and fuel for sure. i did do you mulit point swap to it but it is getting fuel to each cylinder and spark. im pretty sure i have the firing order correct. 1342 from the bottom left side of the dizzy. i dont know what to do. i might sound like an idiot but can i just turn it over without a exhaust manifold on. just to see if it will start. or will it not start?

The way you described your firing order doesn't sound right. Should be...
34
12

I guess if you mean from bottom left counter clockwise then that would be correct...

[sblkcamaro70]

compression of 175 is awesome. i doubt you could get that out of a new motor unless your running high compression pistons. i beleive a normal motor is around 130.

[turtlecrxsi]

Originally Posted by sblkcamaro70

compression of 175 is awesome. i doubt you could get that out of a new motor unless your running high compression pistons. i beleive a normal motor is around 130.

I believe b16 has 10.2-5:1 compression and that seems pretty high in my book.

[Hybrid1990crx]

my b16 had between 180-190 across the board.

when i did my first swap i wired up vtec wrong and that caused it to not start. trying unhooking the vtec solenoid and the pressure switch and see if it starts. if it does that means you wired it backwards.

[2poor2tune]

oh i havent even wired vtec yet. i thought it was an option if i wanted to or not. i know it needs the knock sensor but i just figured it would run crappy. but i dont think i put my tps sensor on correctly. could that be the cause maybe it isnt even reading an idle.

[bambam89lx]

Originally Posted by turtlecrxsi

The way you described your firing order doesn't sound right. Should be...
34
12

I guess if you mean from bottom left counter clockwise then that would be correct...

that's exactly what he said bro. 1342 starting from the bottom left of the dizzy. you even typed it out...the "1" is in the bottom left. A bad tps wouldn't stop a car from starting, it will just run rich. Also, 130 IS low as shit for any honda motor.

my mini me for comparison is at 215 all the way across (i rebuilt it).
my lsvtec is 260-270 all the way across.
my old b20 motor was 175-180 all the way across (9.2:1 compression)

I did these all with the same tester, and tested them the same way.
DON'T use these numbers to compare to your motor. Every compression tester is different.

You're supposed to have the car fully warmed up first. Then, disconnect the ecu or main relay, hold the throttle fully open, and crank each cylinder like 10 times (or until compression doesn't go any higher).

This is straight out of the Haynes manual
B16A2:
Standard=184psi
Minimum=135psi
Maximum variation between cylinders=28psi

Just using that for educational purposes. Like i said, don't compare these numbers to the book, because chances are, you aren't using the same tester they did.

Also, if you don't have an exhaust manifold on your motor right now, the compression numbers will go up when you bolt one on, as well as the exhaust.

I already pmed you, but i'll say it again anyway. If you don't have a manifold bolted on, it won't start. It may, if the motor was high compression (like 13:1 or higher). You're compression is just bleeding out of the cylinders when the cams overlap.

[FrodoGT]

how bout that video of the hatch that ran wide open for like 20 mins with no coolant, had no header at all...not doubting you at all, nor am I willing to fire mine up without a header to prove you wrong, just interjecting..

[bambam89lx]

Originally Posted by FrodoGT

how bout that video of the hatch that ran wide open for like 20 mins with no coolant, had no header at all...not doubting you at all, nor am I willing to fire mine up without a header to prove you wrong, just interjecting..

do you know what the compression was in the motor? what was the motor's displacement? what cams? Did it idle on it's own, or did he have to hold the gas down all the way? I'd be interested to see that video if you have a link...just curious. The guy who did that is retarded anyway, it's not smart to run your motor without coolant for an extended period of time, and it's not smart to run it without a manifold...it will overheat his exhaust valves and valve seals without scavenging from the exhaust.
I didn't say it was impossible. I just said his STOCK b16 won't start without a manifold of some sort. Most V6/V8's can do it no problem...because they have alot of displacement.
This is what's going to happen (as long as the motor is mechanically sound otherwise):
1. he is going to bolt on the manifold
2. it will start

[sblkcamaro70]

Originally Posted by FrodoGT

how bout that video of the hatch that ran wide open for like 20 mins with no coolant, had no header at all...not doubting you at all, nor am I willing to fire mine up without a header to prove you wrong, just interjecting..

not sure what his purpose was but i know they have competitions with small blocks where professional builders will build a fresh motor put no oil in it and see how long they last.

[FrodoGT]

Well I was really just referrin to it running with no header..

[2poor2tune]

yeah frodo is right i have seen that video. the arent stupid well i think so. they were just trying to blow it/ssee how much it could take. but then again they could have just said that and they are in fact stupid but who knows but them. anyway. i just put the header on i got today. its from a 94+gsr integra. and by the way never buy one for your crx with probly any b series in it. it sits very low i guess i will post pics. my car aint that low. this thing hits the ground when i check my suspension. up-down-up-bang-up bang is just a sneek peek of what happens.