sushibug

Well I have been non-turbo for maybe six months now and I FINALLY got around to check my compression. FYI before I tell you the results I used to run a Greddy SOHC Turbo Kit on my 94 Civic Si @ 10psi. Compression results are as follow:

130, 125, 125, 160



feel free to leave any comments or questions. i'll check back on this thread regularly if anyone actually needs a response from me.

DLOTYPER

i would be concerned with all the cylinders besides number one,,, do a leakdown test to make sure,,,i thought if they fell within 25% of each other then your ok, but im not sure, are you happy with those results???i would be a little worried about them,,,, hope that helps

4gen

dude, those are not good numbers.

CivicSoul

deffinetly not good #"s! Do a leakdown!

ahobbs

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sushibug &raquo;</TD></TR><TR><TD CLASS="quote">Well I have been non-turbo for maybe six months now and I FINALLY got around to check my compression. FYI before I tell you the results I used to run a Greddy SOHC Turbo Kit on my 94 Civic Si @ 10psi. Compression results are as follow:

130, 125, 125, 160



feel free to leave any comments or questions. i'll check back on this thread regularly if anyone actually needs a response from me.</TD></TR></TABLE>

I know you know those aren't good numbers becuase of the icon.

Maybe time for a rebuild

Pengo

ouch. what was ur fuel setup at 10 psi?

ion_four

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pengo &raquo;</TD></TR><TR><TD CLASS="quote">ouch. what was ur fuel setup at 10 psi?</TD></TR></TABLE>

I'm guessing some combo of stock or slightly larger than stock injectors, the blue box, or an FMU. all of which are unacceptable for 10psi, IMO.

sushibug

yes i know the results are bad. im deciding whether or not to rebuild right now. thinking about moving to a better car. i dont know how to do a leakdown test.. i thought it required some fancy machinery?

i ran 10psi @ the track with a 12:1 fmu, inline fuel pump, stock injectors/pump, and a missing link. i just think my engine simply couldnt handle the boost. it was rebuilt by an iffy shop with no real strong components.

twkdCD595

leak down is just like a compression test with the difference being that you use compressed air to charge the cylinder and measure its rate of "leak down". also tester is a bit more complex but not as difficult to use (in my opinion). air compressor or small compressed air tank is required.

btw listen for air leak sounds and note their location.

Andrew 825SM

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sushibug &raquo;</TD></TR><TR><TD CLASS="quote">i ran 10psi @ the track with a 12:1 fmu, inline fuel pump, stock injectors/pump, and a missing link
</TD></TR></TABLE>

Hmm could that have been the problem...I don't think stock injectors can hold up to 10 psi.

AbaZ

First add oil to the cylinders and redo your compression test to see if they go up.... I'm sure the rings or ringlands are broke. A leak down test will only decifier if its your rings not sealing or your valves. Unless you have a few burnt valves, or some real shitty valve seats, or even a slightly blown head gasket.

Its a D-series, dime a dozen

PoW3l2BaN

after adding oil, the cylinders were within 10 of each other fyi. this means its definitely rings right?