Talk to Dean Nickerson in PA.

Chris, what good is it if you can't count on your motor to shift and stay running? Are you kidding?

Amen,

Or have to replace starters once a month.... :eek:

Most of them can be set up correctly...if not, they belong on crash boxes with dual starters. :drink:

Is it possible, the following influences some amount of surge ?

1. Blower shaft pulley to engine crankshaft pulley ratio.

A. When the blower pulley is smaller than the crankshaft pulley,the ratio is said to be over driven. Therefore,the more the ratio is over driven,the engine and blower will have a greater RPM differential. Subject to lowest idle RPM, the blower will be least efficient,fuel puddles, fuel ignites,RPM increases and blower increases efficiency. The excess fuel is used and RPM decreases....so goes the cycle.

B. The Bypass valve should equalize pressure at the top and bottom of the blower case and therefore reduce fuel puddling.
Subject to puddling, the spark plugs may stay cleaner. The Bypass valve may be most beneficial on the over driven ratio.

2. The more timing is advanced the more vacuum will fluctuate.

3. The more cam overlap is increased the more puddling is encouraged.

4. Subject to inter cooler fin count per square inch,corrosion and tube arrangement, puddling may increase.

5. The blower case size (8-71 vs. 14-71) , design,condition and etc. may encourage puddling/surge.

6. The flywheel weight may encourage/discourage RPM fluctuations,spark plug condition,puddling and dock manners.

There are several other factors that are of consequence.

What is your opinion ?

Simple, lean the idle.

This is true in a race car application, but with a giant boat, huge blower and bending hoarspower a couple of times it is a little more complex than a lean issue..........

If it was simple everyone would be duing it RIGHT>>>>>>>>>>>>