'76 Merc 888/Ford 302
Havid a bit of trouble and need some advice from those who have been theer before. Engine was rebuilt 150 hours ago or less, carb rebuilt last year. All new fuel filters. Temp at idle, 140, temp after running 2/3 throttle for 30 min, no more that 170-180.
The problem I am having is that after long runs, it won't idle. I can run 2 miles and the temp stays under 160, no problems idling. I can run 12 miles at 170-180 and when I drop below 850 rpm, it struggles to run. I run a "fast idle" of 900-1000 rpm and it runs ok. Once the temp gets back below 150-160, it will idle ok again. I have a new impeller kit to put in it, but it has done exactly the same for a couple years and I did a new impeller last summer trying to make sure I was cooling ok.
The fuel line hangs 1/4 inch away from the block/intake most of its 12-15" length. Carb is teh stock Rochester 2GC on a Merc adapter to the Ford 2bbl manifold.
Would a carb spacer help? I have a line on a stock cast one. Have also considered getting some rubber hose to put around the metal fuel line to try to insulate it against the heat.
Even with short runs, I tend to let it idle for a coupel minutes to get back to 140, otherwise it takes a couple turns of the key to start, like it is having to get fuel back in the carb.
Any ideas on how to solve this problem?
Havid a bit of trouble and need some advice from those who have been theer before. Engine was rebuilt 150 hours ago or less, carb rebuilt last year. All new fuel filters. Temp at idle, 140, temp after running 2/3 throttle for 30 min, no more that 170-180.
The problem I am having is that after long runs, it won't idle. I can run 2 miles and the temp stays under 160, no problems idling. I can run 12 miles at 170-180 and when I drop below 850 rpm, it struggles to run. I run a "fast idle" of 900-1000 rpm and it runs ok. Once the temp gets back below 150-160, it will idle ok again. I have a new impeller kit to put in it, but it has done exactly the same for a couple years and I did a new impeller last summer trying to make sure I was cooling ok.
The fuel line hangs 1/4 inch away from the block/intake most of its 12-15" length. Carb is teh stock Rochester 2GC on a Merc adapter to the Ford 2bbl manifold.
Would a carb spacer help? I have a line on a stock cast one. Have also considered getting some rubber hose to put around the metal fuel line to try to insulate it against the heat.
Even with short runs, I tend to let it idle for a coupel minutes to get back to 140, otherwise it takes a couple turns of the key to start, like it is having to get fuel back in the carb.
Any ideas on how to solve this problem?
