Re: weird and heat shield
this is weird...the exhaust manifold is designed to heat the carburetor..with its heat riser....now we talk about heat cooling it with a heat shield....
. . .
Originally posted by bucky
1-does a weber 32-36 (or other carburated format ) NORMALLY need a heatshield to prevent a "dry bowl when engine is hot"
2-does a sprint exhaust bypass the need for a heatshield?
3-my understanding here..is that most people are running without heatshields...especially if they have changed carbs...
4-should a mechanical fuel pump be wrapped in insulation to prevent its absorption of heat?
Exhaust manifold is actually designed to heat plenum UNDER carburetor
to help emulsify fuel/air mixture FROM carb, NOT really the carb itself, though that IS a byproduct of the design and, hence, the reason for the heat shield under the carb.
The better the mixture is emulsified, the better it burns. In cold weather, gas in the mixture in plenum is more likely to return to liquid state and, remember, liquid gas doesn't burn very readily.
1. ALWAYS a good idea!
2. No, still a good idea!
3. What about good idea is not clear?
4. May be worthwhile, but "vapor lock" usually occurs in the gas line itself (smallest passage, easiest for "vapor lock" air bubble to form).