Some problems after cam install...

[Maverick3169]

I put some 264/272 in my car a while back, with no problems.
The one thing I did notice was that my vaccum was off. It used to sit at around 20-21... but now only at 9-10. At first I figured that is was normal for a car with these cams.

This wasn't a problem until just recently, when I tried to stall my car. I don't race much, but when I tried, it took forever to even stall to 3K. Now, before the cams, I was able to stall to about 4200, at full boost (21psi). Also, I noticed that I have more lag... I can't hit 21psi until about 4100 rpms, when before it would reach it by 3800.

Something else I heard which I thought was strange was this little whistle when just barely getting on the gas in gear. It almost sounds like a little bird chirp, but I'm not in boost at the time. I'm not sure if this is related or not, and I can't remember when I first started noticing that noise. Maybe my CBV is going bad? It's a stock 1g.

Any suggestions?

 

[Maverick3169]

Can you tell me what the vaccum is usually at when cans are done?

How about that bird chirp noise I'm hearing out of boost?

 

[Maverick3169]

triple check your cam timing, your probably off a tooth.

Wouldn't my car suffer performance wise? The car runs great, except for the added lag.

Actually, my wideband reads 16.1 when I'm going from 5% throttle to 15%... this only happens for a split second and it's always out of boost. Not sure if that means anything.

Thanks again.

 

[andymoraitis]

Agreed. Those cams will drop vacuum, but not to 9-10 in./hg. That's way too low. Based on your previous readings, you should be seeing 15-16 or thereabouts. The chirp noise is tough to pin down. When you re-check the timing marks, it might not be a bad idea to see if you can re-create the sound and isolate the location.

Keep us posted,

Andy

 

[95talon_in_ma]

Probably related. A vacuum line is off, or has a hole, and it's throwing off your reading at the same time making that whistling noise. Check them all, even the ones under the throttle body.

Just a thought...

 

[Maverick3169]

When it's in park I read around 9-10 for vaccum... in gear only 6-7. It also tries to stall in reverse if I jab the throttle. Also, the idle drops to 500-600 rpm while in gear.

Sorry, I'm trying to provide as much info as I can here.

 

[Maverick3169]

Agreed. Those cams will drop vacuum, but not to 9-10 in./hg. That's way too low. Based on your previous readings, you should be seeing 15-16 or thereabouts. The chirp noise is tough to pin down. When you re-check the timing marks, it might not be a bad idea to see if you can re-create the sound and isolate the location.

Keep us posted,

Andy

I don't know how I can replicate the bird chirp... it only does it when I'm in gear and getting on the throttle out of boost.

 

[Maverick3169]

I don't have my emission devices hooked up if that matters.

 

[Maverick3169]

What would happen if the PCV was bad?

 

[Maverick3169]

Cam timing is good.

Can anyone tell me what symtoms a bad PCV would give off?