9:1 cp pistons

[bpoweredhatch]

ok i just went to get my car tiuned and we ran into a tone of problems.he told me my cp was to low for the 9:1 pistons. 1st cylinder was 10 2nd&3rd 110 4th 140 is that normal.it has a fully built head crower stage 3 cams

[bpoweredhatch]

anyone lol

[Barefoot]

1st cylinder was 10 2nd&3rd 110 4th 140 hold on #1 had 10 psi. for the most part u want a 10% variation in pressure max.

[Atlblkz06]

I think you meant 100. Even 110 is low - something is up.

[Annihilation]

Thats pretty low atleast 180psi ... did you do a proper valve lash adjustment with stg3 cams? DOes teh car smoke on take off?

[Atlblkz06]

180 for a high CR N/A motor. 140 is about right for 9:1 CR I think.

[patrick4588]

180 for a high CR N/A motor. 140 is about right for 9:1 CR I think.

no. 9:1 should be around 160-180. a stock gsr has 220-240 if its healthy

[The BUCKY]

expected for where you got that motor

[bpoweredhatch]

i got the motor from andrew which he said someone built so im not sure if its a good motor or not.he suspposed to come check it out tomorrow and if its not gonna check out i guess where gonna go to court over this unless he wants to fix it like this weekend. i gotta have a car before i go back to college.but it was 140 110 110 140. itt has stage 3 cams in it but im not sure if the motor is even done right because everybody is sayin he is a bad person now

[Barefoot]

lol court so quick. u said u had the head off already correct.

[BTEC]

lol court so quick. u said u had the head off already correct.
owned!! Warranty void.

[Brian*]

hold on #1 had 10 psi. for the most part u want a 10% variation in pressure max.

x2... something is wrong bro :???:

[bpoweredhatch]

lol court so quick. u said u had the head off already correct.no he sent me a picture with the head off

[bpoweredhatch]

i dont know who said i took the head off but i never took he head off.for some reason he had to put a timing belt on when he got here.im not sayin he screwed me but he gonna try and come up tomorrow and fix it

[-S Double C-]

looks like no turbo lol!!

[bpoweredhatch]

what you mean looks like no turbo

[Barefoot]

i dont know who said i took the head off but i never took he head off.for some reason he had to put a timing belt on when he got here.im not sayin he screwed me but he gonna try and come up tomorrow and fix it


http://www.importatlanta.com/forums/showthread.php?t=211778
post #17


oh we took it apart i do know its built like he said it was

[bpoweredhatch]

we took the oil pan off not the head he offered to come take it apart to show me whats in it

[Barefoot]

we took the oil pan off not the head he offered to come take it apart to show me whats in itthank u for clearing that up for me

[bpoweredhatch]

that was my bad bro

[Barefoot]

i wasn't trying to make you look like a lair or anything just was confused.

[bpoweredhatch]

lol i understand i should of said.but if he comes thru and fix the engine tomorrow everything will be cleared.but its just so much from ppl thats makin me think even more

[bpoweredhatch]

hey someone lock this thread andrew came and fixed the engine it runs fine now time to go back and get it tuned

[BTEC]

hey someone lock this thread andrew came and fixed the engine it runs fine now time to go back and get it tuned
what was wrong with it?

[Barefoot]

atleast he got it working right.

[bpoweredhatch]

what was wrong with it?bad tb gasket,one of my intake mani fitting fell out,starter wasnt ground to good and etc....

[NevrNufTorq]

bad tb gasket,one of my intake mani fitting fell out,starter wasnt ground to good and etc....
none of that should have anything to do with your cp but gl with it :2cents:

[bpoweredhatch]

im not sure if the batt was gettin off enough power because the batt was dyin

[bpoweredhatch]

im not sure if the batt was gettin enough power because the batt was dyin

[81911SC]

im not sure if the batt was gettin enough power because the batt was dyinI'm quite sure that makes the least amount of sense I've ever heard.

[Barefoot]

something is wrong with this picture.

[Atlblkz06]

no. 9:1 should be around 160-180. a stock gsr has 220-240 if its healthy

220PSI = 15:1 compression. How do you get that from a 10:1 compression motor? Heat is the only factor I can think of that can affect pressure so drastically.

[Annihilation]

220PSI = 15:1 compression. How do you get that from a 10:1 compression motor? Heat is the only factor I can think of that can affect pressure so drastically.



these are hondas we make 180-240psi and less than 220hp LOL

but seriously

[Atlblkz06]

these are hondas we make 180-240psi and less than 220hp LOL

but seriously

:thinking:
None of these numbers are HP. 220PSI pressure.

[G.C]

How did all those things you listed fix your Compression.?

[bpoweredhatch]

well i talked to scotty he told me to let oil sit in the cylinders to built the compression back up.the 1000cc injectors must of washed the rings

[Annihilation]

:thinking:
None of these numbers are HP. 220PSI pressure.




this is how we get to 11:1 + comp ratios

http://www.importatlanta.com/forums/showthread.php?t=162463

[-S Double C-]

what you mean looks like no turbo

looks like no boost for you right now...lol what do you think it means!

[bpoweredhatch]

why you say that it runs now

[-S Double C-]

220PSI = 15:1 compression. How do you get that from a 10:1 compression motor? Heat is the only factor I can think of that can affect pressure so drastically.

tha hell you talking about my old 10:1 gsr motor had 240 all across the board and my 10:8:1 h22 had 270

[B18c1Turboed]

I dont think you understand, when your compression is low, its becasue of valve seals, or the rings in the motor.Your compression should not be that low. Something else when you put oil in the motor and do a compression test your, readings will be higher then, since the oil is sealing up the rings.

You need to take the car too a shop and have them do a leak down and a Compression test again. I dont mean to say this but i DOnt think you know what your doing.

Where all on here telling you something aint right. We aint saying it for our health. Of course Andrew gonna find stuff to fix, he dont wanna return a car or money. But something is seriously wrong!!!

[bpoweredhatch]

so does anyone know exactly a 9:1 should?

[B18c1Turboed]

http://www.honda-tech.com/showthread.php?t=2349162&highlight=compression+result

[Atlblkz06]

tha hell you talking about my old 10:1 gsr motor had 240 all across the board and my 10:8:1 h22 had 270

At 10.8 CR, 10.8 x 14.7 = 160psi. Why is the cylinder pressure 270?
270psi/14.7 = 18 times normal air pressure but the CR is only 10.8

CR should be a good way of estimating cylinder pressure but from your examples, obviously it isn't. What am I missing?

[-S Double C-]

my stock ls motor is 180 all across and i believe the compression is around 9:1 or 9:3:1 i forgot.

[LIKEG6]

My motor supposedly has low compression pistons and had 127 all the way across and I've never had any problems out of it.

[bpoweredhatch]

just redone the compression every cylinder was between 130 135