GT40s.com - View Single Post - Vacuum advance

Peter D · 02-13-06, 03:45 AM

Ray, you might want to look at what the various intake manifolds offer in terms of a vacuum chamber. My 8-stack setup is on a DC&O manifold & it has quite a large chamber built in under the centre section. A bleed hole runs into it from each intake port & it has a couple of vacuum take-off ports on top at the back. I think that TWM have a similar setup under their manifold.

We originally had all vacuum devices running off one of these take-off ports, but found that the ECU was getting unreliable readings when the power brakes got a bit of a workout. This problem was solved by moving the power brake line to the second port on the manifold.

Kind Regards,

Peter D.

02-13-06, 03:45 AM	#8 (permalink)
Peter D delaneyp Peter D Join Date: Sep 2001 Location: Sydney, Australia GT40: DRB #27 Posts: 1,245 Rep Power: 21	Re: Vacuum advance - is it needed? Ray, you might want to look at what the various intake manifolds offer in terms of a vacuum chamber. My 8-stack setup is on a DC&O manifold & it has quite a large chamber built in under the centre section. A bleed hole runs into it from each intake port & it has a couple of vacuum take-off ports on top at the back. I think that TWM have a similar setup under their manifold. We originally had all vacuum devices running off one of these take-off ports, but found that the ECU was getting unreliable readings when the power brakes got a bit of a workout. This problem was solved by moving the power brake line to the second port on the manifold. Kind Regards, Peter D.