question about compression with probe pistons

[a_sesshoumaru]

i checked my compressions two days ago and they all were 135psi, i have an almost virgen cylinder head and block, maybe 4 thousands were removed in total, i have probe pistons and a hks 1.5mm head gasket, i remember before puting the probe pistons that the dish was deeper than stock, am i right? i know i dont have worn rings or bad cylinder walls cause my engine was fully build like 5 or 6 months ago and no smoking, consuming oil, or water, everything normal, should i raise the compression to 160psi? i was thinking i could remove the middle steal layer in a gasket i have for spare and just put the two thin layes, would this be correct? Thanks

 

[Mr. Y]

I don't see reason to worry... Your compression is equal, don't stir engine to work!

Are you sure compression test has performed right? Charged battery, opened throttle, warm engine etc...

PS: Probes AFAIK get slightly lower CR to your engine.

 

[a_sesshoumaru]

yea i did it the right ways just the warm part i am not sure, i went from my house to my friends workshop like 10 minutes away, i left the car cold for about 30 minutes and then we decided we should check the compression of my car, the engine still felt hot with our hands, but maybe it wasn`t enogth, lavor for me is free, just wondering if i should raise the compression and if i could use the head gasket the way i said?

 

[HommerSimpson]

well you could use a 1.2mm gasket...dont know the math would be..but around 150 is what i would want at the very least...
guess need to see if that .3 mm is what you need

 

[zachm611]

turn up the boooost lol jk now im starting to be curious since i have probe pistons as well and have not got my engine rebuilt yet. keep us updated!

 

[Adjuster]

It will be slightly lazy down low, but you can run more boost with the lower static CR.

I would not tear into a good running motor just to find a few points of static CR on a turbo engine.

Seriously, just run higher boost when you want more power, and enjoy the low loads on the engine the rest of the time.

 

[a_sesshoumaru]

It will be slightly lazy down low, but you can run more boost with the lower static CR.

I would not tear into a good running motor just to find a few points of static CR on a turbo engine.

Seriously, just run higher boost when you want more power, and enjoy the low loads on the engine the rest of the time.

very convincing, anyone else? do i leave it that way? i just worried because the tsrm says the compressions should not be below 130psi, i am affraid i am almost there with good parts.

 

[IJ.]

What cams and did you use adjustable gears?

 

[Quin]

The TSRM assumes the stock CR. Yours is no longer stock, the number is void.

 

[a_sesshoumaru]

What cams and did you use adjustable gears?

stock cams and stock cam gears

 

[IJ.]

You sure you got the cam timing right?

 

[a_sesshoumaru]

You sure you got the cam timing right?

yes, very sure. If i move one tooth the camgears they would be off the marks in the cover

 

[IJ.]

Ok just checking as it's the only thing I can think of that would drop Comp across the board like that.

143 is very low, I see 160 here with JE's and a 2mm HKS which put me at 8.26:1.

 

[a_sesshoumaru]

Ok just checking as it's the only thing I can think of that would drop Comp across the board like that.

143 is very low, I see 160 here with JE's and a 2mm HKS which put me at 8.26:1.

Should i try to take the middle layer out of the head gasket? just leave the two thin ones?

 

[IJ.]

NO!

I'm with the guys on this it's even across the board I'd retest it with another tester to be sure and leave it alone!

If the 2nd tester reads the same just crank some timing in and some boost and enjoy.