dizy in wrong?

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Oct 9, 2007 | 06:01 PM

#41

Bob Onit

Melting Slicks

Joined: Mar 2006

Posts: 3,342

Likes: 7

From: Connecticut

Quote:

Originally Posted by agent kronus

its the vac thing I'm trying to solve now!!

cheers

dave

Dave, Where did you hook up the vacuum gauge?

When you installed the Air-Gap did you use gaskets on the front and rear of the block or did you use RTV silicone?

Oct 9, 2007 | 06:23 PM

#42

agent kronus

Thread Starter

Racer

Joined: Jul 2007

Posts: 256

Likes: 0

From: Glasgow, Scotland

Quote:

Originally Posted by Bob Onit

Dave, Where did you hook up the vacuum gauge?

When you installed the Air-Gap did you use gaskets on the front and rear of the block or did you use RTV silicone?

the full intake manifold vac pipe on the carb, at the bottom coming out at a angle on the holley 750

I used rtv silicone for the sides

cheers

dave

Oct 9, 2007 | 07:30 PM

#43

Oldguard 7

Melting Slicks

Joined: Apr 2002

Posts: 2,337

Likes: 14

From: Norfolk VA

Sounds like a reliable source for a manifold vacuum reading. Does your vacuum guage have any colored areas or writing on it which indicate a condition such as late ignition timing, weak valve springs, a normal range area, etc. Btw what year is your vette and what mods have you made to your engine. Please take some time and fill out your profile because that will help other members identify your model year or similair mods on their vehicles making it easier to help with your issues.

cheers, mate

Oct 9, 2007 | 09:48 PM

#44

SmokinBBC

Drifting

Joined: Mar 2006

Posts: 1,526

Likes: 2

From: Oak Ridge NC

Quote:

Originally Posted by agent kronus

I played with dizzy, got the thing started, got the timing gun on it, sorted, set at 8 degrees intial timing, it does seem a bit lumpy, but my battery is dead, maybe that might cause it to be a bit funny!

got a vac gauge on it, still slows a low reading 11/12 hg, which was the same as before, defo no vac leaks, maybe worn valves causing low vac or different cam??

Still need to tune carb, which I will do soon

cheers

dave

Dave..check out this site for Vacuum readings...scroll down to the green buttons to get an example of the problem and possible diagnosis.

http://www.secondchancegarage.com/public/186.cfm

Oct 9, 2007 | 10:47 PM

#45

Oldguard 7

Melting Slicks

Joined: Apr 2002

Posts: 2,337

Likes: 14

From: Norfolk VA

I like that. I'm going to put it on my favorites page.

Oct 10, 2007 | 02:14 PM

#46

agent kronus

Thread Starter

Racer

Joined: Jul 2007

Posts: 256

Likes: 0

From: Glasgow, Scotland

Quote:

Originally Posted by Oldguard 7

done the profile mate, my vac gauge just has numbers on it, it reads about 11/12 hg, there is a "little need shake", on the vac gauge website below, says that is sign of cams overlaping, ie performance cams

cheers

dave

Oct 10, 2007 | 02:14 PM

#47

agent kronus

Thread Starter

Racer

Joined: Jul 2007

Posts: 256

Likes: 0

From: Glasgow, Scotland

Quote:

Originally Posted by SmokinBBC

Dave..check out this site for Vacuum readings...scroll down to the green buttons to get an example of the problem and possible diagnosis.

http://www.secondchancegarage.com/public/186.cfm

great website

cheers

dave