Compression and leakdown results in. . . .talk to me guys
 

Well as some of you may know ive been having probs with somking sincce my 1st run at the track on sat.
well i rechecked the compression and im getting weird results that could be debateble

Compression
1-175
2-195
3-175
4-179

Leakdown
1-12-13%
2-12-13%
3-60%
4-12-13%

now im thinking maybe it has something to do with valves, i didnt get a chance to do a valveadjustment yet thinking i would be straight and nothing int he head would have changed https://honda-tech.com/forums/images...s/emhammer.gif I asked my block builder and he said becuase of the ring gaps being loser because of the power and boost output we plan on making there would be a little more leakdown , but they still seemed high, obviously cyl 3 is redicuouls.
What does everyone think? i dont think its headgasket at this point unless its getting blowby on just #3, but what are the odds in that ? like i said best thing i can come up with is either bent valves, or need to be adjusted. It did kinda sound like they might have been knocking since we put the motor in ? i thought it was psitons slap maybe? https://honda-tech.com/forums/images...s/emhammer.gif for me again

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

60% https://honda-tech.com/forums/images...s/emsmileo.gif even 10-12% is a little high. I dont know how that cylinder is makign 175 compression.

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

Do the leakdown again. except this time drop alittle oil into cylinder 3. If the leakdown gets better, then rings are toast, if it doesn't, then its the head.

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

On cylinder 3 when you were doing the test, where do you hear the hissing? i.e., exhaust, intake, oil fill-hole, etc? You can diagnose the problem for sure from that.

Re: Compression and leakdown results in. . . .talk to me guys (servion)
 

thats the thing, its hard to hear where its coming from ? i couldnt tell .

its weird that its getting that much compression though
BTW this motor is 500 miles on the rebuild. im hoping that its not rings yet? how possible could that be it was tuned dead on . with a/f

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

Two things, whats ur CR? Maybe 9:1, if it is, then those #'s are find.

Why are you boosting with 500 miles? Id say you spent a lot of money io build it up. Id do a 750 break in hands down.

That 60% scares me, do the test again, oil do the oil trick to see if its your rings or your ring lands.

- Fred

Re: Compression and leakdown results in. . . .talk to me guys (FredoSP)
 

750 miles? why , the rings are seated after 20 miles. i seated the rings and drove around for a week to get miles on it and broke it in , i tihnk 500 miles is enuff,
im gonna try the leakdown again if i get time .i gotta give the tester back tommorow, and i dont have a compressor at home , so i gotta run to my moms to user her BF's, thats 45 min away , i might just have honda do it next time . and try a valve adjstment while they are at it if they dont think anything is wrong with the rings.

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

Sounds like we're having some similar issues. Your Compression is in way better shape then mine atleast. I'll be doing a more thourough Compression test and a leakdown on Saturday. I'll post what we figure out in my case.
Mark

Re: Compression and leakdown results in. . . .talk to me guys (01ITR#700)
 

man, wtf is going on? Ring-bake week?

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

if a/f and timing has been good, then the motor was built incorrectly, or had incorrect machining done.

breakin with boost. https://honda-tech.com/forums/images/smilies/emthup.gif https://honda-tech.com/forums/images/smilies/emthup.gif https://honda-tech.com/forums/images/smilies/emthup.gif https://honda-tech.com/forums/images/smilies/emthup.gif

breakin without boost is like dumb!

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

see i dont think its rings thuogh. it smells and looks like unburnt fuel , and my plugs look like they are running rich for some reason.
i noticed this after i hit boost cut on the hondata on sat morn . but for all i know it coulda been smoking bfore that and i never noticed , i might just take it for a valve adjustment and pray

Re: Compression and leakdown results in. . . .talk to me guys (itr206)
 

ok well honda redid the leakdown and said the air was coming from the oil fill hole, so that means deff bottom end issue from what they said,either sleeves, rings or pistons.
FUCK, back to the drawing board i guess.