Bob, I would like to try this solution but curious to the benefit of a fuel return with a Holley regulator. Unlike EFI, the unused fuel is not flowing back into the tank, it continues to sit in the bowls of the carbs until used. How is the fuel "cooling" in the carbs?
The percolation happening on my motor seems to be obviously related to heat from the headers because only the rear two IDA's are percolating, closest to the "bundle" (no isolators, turkey pan or shield barrier) and begins after a minute or two from turning the motor off. Odd thing is, #3 & #8 cylinders are the only two that percolate fuel into the throttle body. Is that normal? It's the same throttle body if you're to orient the carbs the same direction so my assumption is that there is an outlet for the fuel to escape easier at one throttle body than the adjacent one.
Tim[/QUOTE]
Tim all the suggestions regarding shields,spacers etc are all valid and play a big part in keeping the carbs cool. Running down the carbs makes sense but is a new one on me however we dont experience temperatures like you have over here. Fuel return is just another bit player, cool fuel is better fuel and without a return it sits in the pipe soaking up engine bay temperatures untill a needle drops , then charges the carb with hot fuel. That cant happen with a fuel return system.
Bob
The percolation happening on my motor seems to be obviously related to heat from the headers because only the rear two IDA's are percolating, closest to the "bundle" (no isolators, turkey pan or shield barrier) and begins after a minute or two from turning the motor off. Odd thing is, #3 & #8 cylinders are the only two that percolate fuel into the throttle body. Is that normal? It's the same throttle body if you're to orient the carbs the same direction so my assumption is that there is an outlet for the fuel to escape easier at one throttle body than the adjacent one.
Tim[/QUOTE]
Tim all the suggestions regarding shields,spacers etc are all valid and play a big part in keeping the carbs cool. Running down the carbs makes sense but is a new one on me however we dont experience temperatures like you have over here. Fuel return is just another bit player, cool fuel is better fuel and without a return it sits in the pipe soaking up engine bay temperatures untill a needle drops , then charges the carb with hot fuel. That cant happen with a fuel return system.
Bob
