Howdy,
I posted these two questions on my "My New '78 FJ40 "44-40"" link ( https://forum.ih8mud.com/threads/my-new-78-fj40-44-40.799358/page-3#post-9373073 ), but I seldom get a response to questions I pose in that thread... probably just me not fully understanding MUD etiquette...
At any rate, I just returned from a 700+ mile maiden trip, during which, I had two minor issues with 44 - and would appreciate your thoughts:
1. Acceleration really bogs down on tough climbs - heading into Austin, NV, on US 50, from the east, the grade is fairly severe (we encountered many other more severe grades off road), 44 bogged down to 35 mph (never lower) and the vacuum gauge dropped to 1.
I assume the deceleration on the climbs were the result of the low compression numbers I reported earlier, in this thread. Am I correct that there is a direct correlation between deceleration and low vacuum? Stupid question? Perhaps... it seems obvious that when the engine isn't producing much power, it also isn't producing much vacuum, but I could be wrong.
2. 44 quit running, at 55 mph, just as we crested a grade, coming south out of Tonopah, NV- I coasted off the pavement, over the shoulder and up a hill (to ensure it would be safe to work on 44). I suspected 'fuel starvation' and pulled the air cleaner so I could check the (Aisin carb Jim C just rebuilt) sight glass. The glass showed no fuel and there was a ring of engine oil around the mouth of the carb.
I'm sure the engine oil was from the air cleaner - it always has a couple of tablespoons of oil in the air cleaner, from blow-by. I choked the carb and turned the key and the GR Starter got it started on the third try. I shut it down and restarted on the first try - no choke.
It was hot in Tonopah (about 100*) and the wind was BLOWING - I have a bastardized carb cooling fan, on a manual timer, so I turned it on for an hour and continued driving with the fan running and made the final 3.5 hour drive home, with no further problems.
I'm sure 44 died because the fuel boiled out of the carb - even though the engine never overheats (about half-way on the gauge), it is VERY hot under the hood.
Does anyone see this issue as something other than what I've diagnosed?
Thanks to all who respond!
I posted these two questions on my "My New '78 FJ40 "44-40"" link ( https://forum.ih8mud.com/threads/my-new-78-fj40-44-40.799358/page-3#post-9373073 ), but I seldom get a response to questions I pose in that thread... probably just me not fully understanding MUD etiquette...
At any rate, I just returned from a 700+ mile maiden trip, during which, I had two minor issues with 44 - and would appreciate your thoughts:
1. Acceleration really bogs down on tough climbs - heading into Austin, NV, on US 50, from the east, the grade is fairly severe (we encountered many other more severe grades off road), 44 bogged down to 35 mph (never lower) and the vacuum gauge dropped to 1.
I assume the deceleration on the climbs were the result of the low compression numbers I reported earlier, in this thread. Am I correct that there is a direct correlation between deceleration and low vacuum? Stupid question? Perhaps... it seems obvious that when the engine isn't producing much power, it also isn't producing much vacuum, but I could be wrong.
2. 44 quit running, at 55 mph, just as we crested a grade, coming south out of Tonopah, NV- I coasted off the pavement, over the shoulder and up a hill (to ensure it would be safe to work on 44). I suspected 'fuel starvation' and pulled the air cleaner so I could check the (Aisin carb Jim C just rebuilt) sight glass. The glass showed no fuel and there was a ring of engine oil around the mouth of the carb.
I'm sure the engine oil was from the air cleaner - it always has a couple of tablespoons of oil in the air cleaner, from blow-by. I choked the carb and turned the key and the GR Starter got it started on the third try. I shut it down and restarted on the first try - no choke.
It was hot in Tonopah (about 100*) and the wind was BLOWING - I have a bastardized carb cooling fan, on a manual timer, so I turned it on for an hour and continued driving with the fan running and made the final 3.5 hour drive home, with no further problems.
I'm sure 44 died because the fuel boiled out of the carb - even though the engine never overheats (about half-way on the gauge), it is VERY hot under the hood.
Does anyone see this issue as something other than what I've diagnosed?
Thanks to all who respond!
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