Warm air intake for Jubilee

Geo-TH,In

Well-known Member
I made this out of 4 inch saddle tee, 4 inch
aluminum dryer vent tubing, and a 4 inch adapter.
Tested it out today. outside temp 29, air temp
going in to carb 91. Works great, no more winter
stumbling under load.
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It makes no sense to me why you think you need that on that tractor. The muffler, air cleaner and air intake pipe from air cleaner are tucked under the hood and exposed to all of the engine heat already. ( a poor design in my opinion). My case tractors have the air cleaner mounted in front of the radiator, and the mufflers are above the hoods, and I have never had problems with the engines running in 0F conditions. Have just opened the high idle jet in the carb up a 1/4 turn in winter. Cold intake air makes more power, The reason why intercoolers are common on engines now days.
Loren
 
It would make sense to you if you would see how the engine wouldn't run in the cold, below freezing. I crank the main jet out in winter, up to 2 full turns past summer setting, and back in for summer. Engine would still stumble, almost die, when governor opened up under load. Carb would also ice up.

I'm happy with results. May even crank main jet back to summer setting.

Cold air is more dense, and requires more fuel too.
 
You should be able to leave jets set at summer settings.I put a set up on my tractor and it works great. In weather down in the 20s and colder the carb and air cleaner are warm as toast after runnig 15-20 minutea. I take mine off in summer. I know this was your first attempt at this. You may want to go down to a smaller air ducts. They do make some 2 1/2 inch air intake duct. If you use one about the size of the air intake on air cleaner the carb will warm up faster.
 

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