Gas Carb too Firewall distance
06-17-2019, 05:21 PM
#1
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Gas Carb too Firewall distance
What is the rule of thumb for mounting a rear facing carb on a gas engine what distance from firewall for air flow and proper performance?
06-18-2019, 12:17 AM
#2
If there is enough room for the choke plate to open, you have sufficient clearance for the engine to breathe. I have several models that pass this test and they have been running fine for years. I'm sure that more distance is better, but so far I've had no issues. Hope this helps.
06-18-2019, 02:08 PM
#4
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+1, I like an inch also but have had a few engines that had a bit less. I some cases where space was tight, I bored a large hole in the center of the firewall and capped the back side with a piece of thin ply. This creates a sort of bowl in the firewall for additional breathing space. A hole through the firewall into the engine box is completely acceptable and is common.
