marine carb clarification
#11
Charter Member
Charter Member
Join Date: Oct 2000
Location: Central, Ohio USA
Posts: 1,074
Likes: 0
Received 0 Likes
on
0 Posts
Some of the older marine carbs from Mercury did not have j tubes.
#12
Registered
Join Date: Jul 2008
Location: Darwin, Australia
Posts: 730
Likes: 0
Received 0 Likes
on
0 Posts
From Mr Dennis Moore's Book... (a personal favorite of mine) As well as the J-Tubes:
"Throttle shafts are grooved and slabbed to prevent fuel from leaking out of the throttle shafts if the accelerator pump is activated without the engine running, or if the engine is flooded. The grooved and slabbed throttle shafts direct the raw fuel back into the intake manifold where it is consumed by the engine."
For what it's worth, I run a BG Demon (non marine) carb on my BBC. I do hope not to blow up someday!
"Throttle shafts are grooved and slabbed to prevent fuel from leaking out of the throttle shafts if the accelerator pump is activated without the engine running, or if the engine is flooded. The grooved and slabbed throttle shafts direct the raw fuel back into the intake manifold where it is consumed by the engine."
For what it's worth, I run a BG Demon (non marine) carb on my BBC. I do hope not to blow up someday!
#14
Registered
Join Date: Mar 2006
Location: Lake George NY
Posts: 432
Likes: 0
Received 0 Likes
on
0 Posts
Final Answer
Holley Marine Carb We all know about J Tubes The Throttle shafts are grooved and slabbed to prevent fuel from leaking out of throttle shafts. The groved and slabbed throttle shafts direct the raw fuel back into the intake manifold. If a flood condition should happen.
Calibration; richer pump shot and mian metering circuit activated at lower rpm.
This is from Dennis Moore's book. Big-Block Chevy Marine Performance from HP Books. Section 1 The difference between Automotive and Marine Engines. Section 1 covers Electrical Systems , Fuel Systems, Fuel Pumps, Carburetors, Hoses, Crankcase Breathing, The book is a most for perfomance boaters doing there own worK
Calibration; richer pump shot and mian metering circuit activated at lower rpm.
This is from Dennis Moore's book. Big-Block Chevy Marine Performance from HP Books. Section 1 The difference between Automotive and Marine Engines. Section 1 covers Electrical Systems , Fuel Systems, Fuel Pumps, Carburetors, Hoses, Crankcase Breathing, The book is a most for perfomance boaters doing there own worK