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View Full Version : Turboed comp. numbers....


gfrg88
05-05-2006, 06:20 PM
does anyone now around how much the compression on a tubo b18 is supposed to be?? its not the same as stock is it?? oh and this is with 8.5:1 pistons

TIA :cheers:
AccordEpicenter
05-05-2006, 06:30 PM
go at least 9-9.5-1
gfrg88
05-05-2006, 07:08 PM
no thats not what i meant, the car puts out 105 psi of compression, is that about right?? but yeah thats what the plan is for the next engine, 9.0 JE pistons ;)
shepherd79
05-05-2006, 09:13 PM
105 psi? say good buy to your rings.
they are shot.
you should be getting around 165-180 psi or 150 psi minimum.
I say time for a full rebuild and let some one tune it next time.
gfrg88
05-05-2006, 09:19 PM
105 psi? say good buy to your rings.
they are shot.
you should be getting around 165-180 psi or 150 psi minimum.
I say time for a full rebuild and let some one tune it next time.

but the car runs great. its running 13s on 10 pounds of boost. but what we're not sure if the pistons are 8.0:1 or 8.5:1 :dunno:

and its been tuned by a my bros friend at a shop, dynoed at 249 whp.
mkymonkey
05-05-2006, 09:37 PM
so this is your brother's car?


sorry i dont have anything to contribute. i just thought you were getting a b18 on YOUR car
gfrg88
05-05-2006, 09:40 PM
ha, i wish it was for the accord. yeah its for my bros car, im always trying to help him out in some way. he doesnt like going to other car forums since theyre all assholes like, hes always asking me to post on here :D
mkymonkey
05-05-2006, 10:57 PM
i can be an asshole! watch....you bastard! lol

so whats the b18 in? an integra or a civic?
gfrg88
05-06-2006, 10:58 AM
its in 90 teg. and you, yes your an asshole ;)


anyone else now what compersion (psi) this engine should be with low compression pistons?????
gfrg88
05-06-2006, 07:21 PM
anyone????
shepherd79
05-07-2006, 09:16 AM
here is the deal, if look at stock engine compression, for example 3g carb motor (86 model) it had 8.8:1 compression and the book says 175 -180 psi.
So on 8:1 or 8.5:1 you should have 160-175psi. Make sure you do the compression test with TB fully open.
Most likely you need to rebuild the motor. I bet it will pick up extra 50+ hp after you rebuild.
FyreDaug
05-07-2006, 11:00 AM
Sounds like something is shot, hows the head on it?