So, I'm pulling about 9vac at idle and I was wondering if maybe it was the cams, I have crower 2's with JE 8.8:1 pistons, and plan to run 15psi very soon, right now, I have no turbo on the car. I have looked absolutely everywhere for a vac leak and have found nothing, I was thinking because of the bigger cams, my vac would be lower at idle. My car runs great besides the idle which I made a lot better by bumping up the idle so it won't lope. Anyone, I really want to know why I am pulling only 9vac at idle, TIA. Help would be great.
~Jeffo


Like my tail lights? Get used to looking at them.

do you have compression #'s?

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

I would first check your cam timing marks. Even one tooth off will cause the symtoms you have- rough idle,but off idle is fine. Not sure how much the crower 2s will effect idle quality, others who use them can comment on that.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
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My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

Well, my marks align perfectly, but I did have the head shaved twice, I can't remember how much. I did however mess with my adjustable cam gears and retarded the intake cam 1.5 degrees and the idle got better and I got +2 more vac on my gauge. I tried advencing the timing on the intake cam 1 degree, but the idle got worse and power went to crap. I just don't know where to adjust the exhaust, or even if I should, I havn't gotten a single check engine light since rebuild. Thanks for the help so far though.
~Jeffo


Like my tail lights? Get used to looking at them.

Ok, nevermind, I went -2 on the intake and then it idled like shit and vac went to 10, so I am stumped. I thought I read that with the crower 2's, you'll pull low vac, is that true? I really hope it is, anyone with crower 2's?
~Jeffo


Like my tail lights? Get used to looking at them.

Same as any big cam. You're fine, don't panic.

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'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



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Ahhh, this sudden rush of happines has rushed over my body. Sweeeeeeeeeet, I actually rebuilt it right!! WAHOOOOOOO. J/K Anyhew, thanks for the info, and it's turbo time.
~Jeffo


Like my tail lights? Get used to looking at them.

I got the crower stage two cams with 10.5 pistons and i get around 10-11 of vac so you are fine and about the idle i get pretty lopey idle but i already got used to it.

I loved the lope when I first got my car back together until everyone started saying I had a vac leak and it wasn't supposed to idle like that. Thanks to the help of 2gnt, I am back to loving the lope. Thanks a ton for the help guys, I feel invinsible now. Lope is the shit huh, I'm gonna get a sound clip of it so everyone can hear it.
~Jeffo


Like my tail lights? Get used to looking at them.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

FYI, if you have an ignition with timing retard control, that can also cause this. If you turn the timing knob on accident or a pressure switch goes to crap and pulls out a bunch of timing, you will see the same thing. I know this isn't the case here, but just so people know...there it is

Matt
1995 Eclipse GS
2.0L, S16g Turbo, 8 Injectors, 26psi

1998 Eclipse GSX
2.3L Stroker, AEM EMS Converted to Speed Density, FP3065 Turbo, 35psi , and so on...

Yup i have the crower stage 2's with 8:1 and i have around 9-10 for vac with no leaks.