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Index > Engine/Drivetrain > Thread: Carb. Icing
Thread: Carb. Icing
Uncle-Jim


Revvin Up
Posts: 64
posted January 21, 2003 08:54 AM

Carb. Icing

I'm hopin' that some of you have solved this problem, or can give some clever idea's.
This time of year when driving in snow, rain, fog, and temps around 28 - 36, one or both of the carb venturi's will ice up so bad, the engine won't idle. Carb icing has been a common problem with every non-F.I. rotary, however Mazda solved the problem by wrapping the thermal reactor with a cover and sucking warm air with that heat tube.
My problem is that I have headers on my REPU, I still have the heat tube and plate in place, but it doesn't appear I'm getting enough warm air off the headers keep the venturi's from freezing up.
Anybody know how they keep ice out of aircraft carbs?
I've been thinking of rigging up some sort of heating element above the throats, but I don't want to torch up my engine either.
TIA,
Jim
____________
Uncle Jim
72 Rx-2 Show Car; '77 REPU (250K & goin' strong) 2 - '76 Cosmo's

       
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brad


Rotorhead
Posts: 1665
posted January 21, 2003 11:25 AM

Bend that thermal reactor cover to fit on the headers and run a metal flex hose up to the air filter.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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Uncle-Jim


Revvin Up
Posts: 64
posted January 21, 2003 12:15 PM

I did bend the cover like you suggest, and the heat tube is in place, however I could get the cover closer, and maybe cover with some appropriate insulation.
____________
Uncle Jim
72 Rx-2 Show Car; '77 REPU (250K & goin' strong) 2 - '76 Cosmo's

       
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repuguru


Redlining
Posts: 319
posted January 22, 2003 08:43 PM

If you've access to a welder just weld a short piece (2 inches) of muffler tubing the diameter slightly smaller than your heat riser flex hose directly to the header. You only can tack it in two spots when you mate the flat bottom part of the tube to the round header, so it not a major problem.
The air will easily draw in from around the header.

I don't have this done to my truck, but I have had another car I had from somewhere up north that had this done.
The heat shield from the stock thermal installed over the headers is working fine for me. But we also have few extremely cold days here.

On one of the few cold days, I start the truck up and let it run on choke for about 3 or 4 minutes, then shut it off and let it sit for about 2 or 3 minutes. The heat radiating up from the motor will warm the carb enough to bring it above freezing and allow the venturis to work properly.

       
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