About one year ago i purchased a 95 civic that already had a swap (B16A(JDM))
Done.
Once i had it a checked the compression, looked for leaks, ETC.
The compression test read:
Cyl #1 ---- 175
Cyl #2 ---- 170
Cyl #3 ---- 175
Cyl #4 ---- 175
one year later i re checked them after a hard racing season with SCCA.
Result: all Cyl's stayed the same.
Next Question: Is 175 for a JDM B16A to low? i've heard it should be about 190+?
I had a chance to talk to the guy that did the swap.... he said they put C5 pistons in it ..... the reason i'm asking so much about this is that i have a RevHard Stage 2
Turbo ready for install .... wanting to make sure these pressures are a good thing.
Dont want to Blow anything!!
Is there anyway of telling if he did "Indeed" put diff/new pistons in it without dismantling the whole thing?
Thanks for any and all Help and Info on this matter

Purplehaze-95

 

as long as the #'s are all within range of eachother

uve basicaly got 175 across the board which is fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Morning Call &raquo;</TD></TR><TR><TD CLASS="quote">as long as the #'s are all within range of eachother

uve basicaly got 175 across the board which is fine</TD></TR></TABLE>

Looks good to me man, all the numbers are very close to each other which is awesome.

 

my jdm b16a sir2 gets 210 across

but its the same range that matters -+20psi

if it has type r pistons in it shouldnt it be higher in compression??

 

Thanks .... now i know my rings are in good shape .... had leak down done today
"All" checks out just fine!!
Next question: With #'s that low for a JDM B16A ... would not C5 pistons lower the compression more do to the B18C5 having a Stroke of 87.2mm compared to the JDM B16A's stroke of 77.4mm? Or would they equal out?
Again i'm waiting to install a 7psi Turbo Kit and am wanting to make sure the Turbo wont compremize the engine do to diff pistons being added!!
If a JDM B16A ='s 210 on a compression check and mine being 175 .... wouldnt that mean that the compression has been lower'd do to the C5 pistons Correct?
Thanks for all the Info reguarding my 175 Comp. check

Purplehaze-95

 

i would adjust the valves to get that 170 back up to 175

 

Did you do the test at WOT? When I did mine, I got numbers around 150. Checked the helms, and it said to do it at WOT. Rechecked, and I got around 205 on each cylender.

 

If you want to add the turbo with 7 psi, which is a safe pressure, wouldn't you want the lower compression so it's easier for the compressed air to get in and fire in the chamber? Go SCCA!

 

Different Compression testers vary reading

ALSO something as simple as a cam change can give "different" compression readings

I only use those testers to guage the diff in cylinder variance.