JE, I'll look at whipples web site....Are you familiar with the valve ?

Thanks, LE

PS: We have found a highly engineered valve for holding vacuum on a dry sump motor. Kind of a must have. Might work for bypass on the blower.

Tommy at Chief Engines has a cure for that surging idle that involves a vacuum line to the metering block.

Damn, that sounds cool.

It does sound cool but it's rough on tranys' and drives, depending on who's on the sticks.

Ron Potter has a good set up, his motors don't seem to surge nearly as badly as most.

AS to the root cause, I'll leave that to the engine gugrus'.

If you take the time to set them up it is possible to get a strong smooth idle. Get all the shutters even and make it run on the idle circuits.

I wonder if our motors have that. We have minimal surge compared to others who have blower motors.

I have zero surge with only a slight hunt when shifting into neutral but that's normal for a blower motor.

The surging is caused by fuel puddling in the intake. The line that goes to the metering block is most likely a boost reference line...this has been done for years.

EFI fixes that! :D

Me Too!!!

Easy work-around. Warm your motors up in neutral. Shut them down and restart in gear.