VAC ADVANCE

[tonym]

I'm currently running a standard RV8 with a 35DM8 distributor. i have recently found out that the vacuum advance is not working, whilst under initial vacuum it advances, the module will not hold the vacuum. The question is this: - what effect is not having a vacuum advance doing to the running of the engine, and what is it doing to the performance? At the moment I'm using twin Stromberg carbs. :tu

[Philip]

Hi,
I have one you can have FOC, I bought it as mine was duff too, I didnt notice any difference with it but a mate of mine had the same problem and he noticed a difference with a carb setup. I have since changed over to a mappable system, so its no longer needed, email me your address if you want it.
philip.ringwood(at)ntlworld.com
Phil :tu

[osgood]

Tony, acceleration will be sluggish and may initially affect the top end if no advance state is achieved you will only be running 6 deg before TDC instead of a total of perhaps 28 deg's Eric

[roll control]

Tony, the weights in the dizzy control the timing. The vac advance is there primarily for fuel economy although as pointed out it can affect acceleration and top end performance :tu

Rob

[Philip]

Hi all,
Ive sent him my spare unit, :tu
Phil

[tonym]

Thanks for the advice, it helps explain why i don't feel that i'm getting the best out of my engine.
Thanks Phil' i look forward to recieving it in the post :tu