In halted traffic-->Engine Surging/reving

[ewingr]

My engine is a 350 Chevy engine, and is has a B&M Street Blower (5lbs boost) with a Holley manifold referenced power valve.

The problem I am having is that if I am in stopped traffic for a period of time (i.e. a rod run consisting of 5000 participants, and stopped or moving 1-2mph for 5 minutes)...when traffic then picks up the engine surges. For example, it's as if I were pushing the pedal, letting up, pushing, letting up. This happens until I get moving to 30 mph for a few seconds then clears up.

One thing I am sure of is that it is getting quite hot under the hood...and when I get moving the air flow relieves that heat. I expect it is heat related.

That being said, I'm not sure in what way.

Any thoughts?

[AlmostStock]

I think your correct to suspect heat. The fuel in the lines under the hood may be getting too hot causing a heat soak problem. When the car is moving you not only get better air flow to cool it down but the fuel is moving through the lines faster giving it less time to heat up. I had the same symptoms on a new Trans am. The dealer tried unsuccessfully to correct the problem many times. The final fix was a small electric fan ducted to my carb fuel bowl. It helped a lot. Of course your system is different with the blower but try cooling down the incoming fuel somehow(cool can?) and I bet it won't happen.

[ewingr]

Thanks.

I was thinking also that possibly it was vapor locking...which is probably more or less what you are talking about. I might try putting heat shield tape of something around the fuel line and see if that helps.

The cool can is an interesting idea too.