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Re: what about sidedrafts? (archive)
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Posted by WH on September 25, 2000 at 11:02:09:

In Reply to: Re: what about sidedrafts? posted by Dwight H. on September 25, 2000 at 10:16:09:

what about sidedrafts, they don't have any vaccum advance hoses.

Which dizzy is best suited for weber 40 DCOEs?

Thanks


Just my guess but since these carbs would normally be used with high performance engines with high compression a vacuum advance dist would not be needed because it would tend to cause the engine to knock. On this type of engine, a tii mech advance dist with less advance would be required and thus no vacuum port is provided.

Actually you could use a vacuum distributor with sidedrafts on the street. The reason many don't is the four separate intakes and lack of consistant vacuum for a distributor. If you tie all the intake runners together it can be done. Probably with better mileage to boot.

The main reason why racers etc don't use a vacuum distributor on the track is the constant shifting at high rpm. It is better to set the timing at maximum total advance with a mechanical dist. (which can be curved to suit the engine) than wonder where the timing is with a vacuum assisted one?

WH

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