Ok guys, so im kinda stumped here, im pretty sure i know whats going on, but i want some opinions...

My setup (important parts) is the following:

-d16y7 block w/a6 crank
-ported and shimmed pump
-76mm vitaras w/eagles .004 p2w
-sealed power rings from advance auto (top gap .019 2nd .022)
-z6 head
-stock headgasket
-57 trim w/sls mini log
-650cc injectors
-tial wg and bov
-tuned up to 22psi on pump and 30psi on 110
-afr's are 12:1 up to 14psi, over that they taper from 12:1-11.2:1 @30psi...
-total timing @14psi is 16*, total timing @22psi is 10* on pump...
no dyno numbers at 30psi, but the car made 281whp@14psi and 330whp@20psi...

so on to the problem, the only crankcase evac i had was leaving the black box port open to atmosphere (not the hole in the block, but the hole in the box lol), as well as the valve cover vent... 3rd trip to the track it started blowing a little oil out of the black box port, so i tapped the valvecover in two spots and it stopped pushing oil, and i thought i was in the clear... since then ive added 2 catch cans and just vented them to atmosphere and the car runs GREAT...

first comp test when the engine had 100 miles on it was 140 all across and pulls 21 lbs on the boost guage on idle...

fast forward 2400 miles and the car seems to have a little smoke coming from the catchcan, but still runs fine and boosts great, still holds 21 lbs on the boost guage, but i decided to do a comp test to be safe... from 1-4 it goes 60-120-120-80...

threw some oil in cylinder 1 and bumped it to 120 and a little oil bumped cylinder 4 to 140...

the car burns ZERO oil, pulls hard, idles great, afr's havent changed, pulls the same vac on the guage, doesnt smoke on idle/decel/wot! im stumped?! thinking that all taht crankcase pressure just waxed my rings maybe???

ive searched the forums 10000 times, ive read every crankcase evac thread 3 times over, i was just being lazy and didnt properly set it up before beating on the car...

thinking back i thouht maybe it could be ringlands, but even now, at 20psi the car ran 7.7@95mph on a 1.8 60 foot (approx 11.7x@12x 1/4), so its running like it should...

should i just forget it and run it, or tear it down? this IS a daily driver, keep that in mind... thanks for ANY assistance...




Modified by jarvis199 at 1:57 AM 10/24/2008

 

You do this test with the engine cold I assume? I wonder if maybe the .004 wall gap has something to do with it.

I only have the black box and valve cover nipped open on my setup, and I've seen a ton of Dseries guys that are the exact same and I've never really seen it cause any problems. I made 325whp on 18ps AFTER I put 3000 12-14psi miles on it, haven't changed anything.

IDK, if it makes the power and doesn't burn any oil, I wouldn't worry about it. But I'm in for answers/solutions anyway.

 

my old vitara setup that went 11.5 had 27k miles on it when i tore it down and it was still holding 130psi on a hot comp test, and that was with .008 wall clearances lol...

i really think it has something to do with the junky rings!

all comp tests were HOT w/the throttle plate open...

im about to tear this block down and throw some fresh rings and bearings in it and sell it (hastings this time) and im putting together another 75mm vitara block... oh how i miss the slap...

wondering if it could be in the head? but would adding oil make the comp numbers go up that much?

also, i checked my valve lash and its fine, proly shoulda made sure cam timing was perfect... i dont see the car running this well if it were a tooth off...


Modified by jarvis199 at 2:44 AM 10/24/2008


Modified by jarvis199 at 2:50 AM 10/24/2008

 

i believe i am in the same situation as you sir. went to the track filled my catch can in 4 runs, had oil in the #4 cylinder, things werent looking to good. Comp. test last night turned out to be 160-160-170-160 pretty good numbers.

What i would recomend and what i am going to do hopefully today or tomorow is do a leak down test. The leak down test will tell you everything you will need to know about your engine.

So i would say try that first before you go tearing it apart.

 

your compression numbers sound great, where is your catchcan located? and how is it plumbed?

im going to leakdown mine today, but im pretty sure its just junk rings...

 

catch can is plumbed from the black box on the back of the block, with the valve cover breather just open, ran out of hose.

Strange thing is though there was absolutely no oil coming out of the valve cover when i filled my car, weird.

Let me know how your leak down turns out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jarvis199 &raquo;</TD></TR><TR><TD CLASS="quote">your compression numbers sound great, where is your catchcan located? and how is it plumbed?

im going to leakdown mine today, but im pretty sure its just junk rings...</TD></TR></TABLE>

Oh **** I missed that you had autozone rings in it. Yeah, I don't see them holding up to much of anything, these hastings rings seem like they'll take just about anything.

And yeah, 75mm Vitara setups FTW! Old school slap style.

 

well, someone broke my leakdown tester, so i went ghetto and just took the valve outa my comp tester, put the cylinder on tdc and stuck her on there, cylinder 1 for sure has some ring blowby, but nothign to be that concerned about i dont think...

wtf do i do here lol... yank it apart and throw rings in? build a fresh blcok with .040? or throw some forged pistons/rods in this b16 i have in the back

i really wanna stay d!

 

what were your numbers from the leak down test?

 

no numbers... like i said someone broke it, so i just threw some compressed air in the cylinder with that cylinder on tdc and listened for leaks...

tried to call a buddy to borrow his leak down tester but no answer so i did what i could lol...

did find out cylinder 3 needed the intake valves adjusted tho lol...

oh well, building another block...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jarvis199 &raquo;</TD></TR><TR><TD CLASS="quote">
oh well, building another block... </TD></TR></TABLE>

As my dad always says, "it's just money right?"

 

lol i hate that saying lol

 

anyone have anymore suggestions?

 

I would do a leakdown before tearing it down. Who knows could just be something in the head causing that low of compression.

 

yea, i would love to do a real leakdown, but there is really no point, i put compressed air in cylinder 1 with it on tdc, and there wasnt anything coming past the valves, it was all rings... so i guess i got my answer...