Tilly Warpage

P

Pappabob

Member
Does anyone know of any "known" remedies for the heat warpage Tilly's are known to experience ???
Does anyone have any "brilliant" ideas for such a remedy ??

I'm thinking something like an aluminum "shield" plate that would block some of the radiated manifold heat or maybe something like the "bakelite" blocks that used to be used on Stovebolt Chevies ???
 
You could easily just make a flat or angled sheet metal plate to sandwich in between the carburetor mounting flange and the intake manifold flange. The thickness of the plate should not effect carb performance ................ unless it acts opposite to expected and radiates and confines the heat "around" the carburetor.

You may be overthinking this problem. Most Tillotson carburetors that have warped have seen significant usage. If your carb starts off without warpage, if timing is correct, if you're not using the car to drive 300 miles a day at top speed, then it would probably take quite some time before significant warpage occurs again. Just my opinion.
 
I don't believe it's a heat thing, pot metal will warp, crack, expand, crumble on its own given enough time. For many years I've restored antique coin-operated machines, not much heat there--some of the pot metal parts have turned to gray "dust" and crispy nuggets. There are different qualities of pot metal I have found.
 
I have had a 31 Model A - 5 Window Coupe for 43 years. Total Frame off Restoration in 1994. I have driven it many places at many different speeds and am now on my 4th Carburetor due to Warpage. The engine has never overheated and I do my best to keep the engine tuned properly all of the time. If it weren't for the fact that my Zenith was so finicky I would revert back to using it. I wish I could stop the Warpage!!! Your suggestions are WELCOME
 
Pot metal has zinc in it and is a battery. As the zinc turns to zinc oxide it will expand and warp. I think it takes moisture and air to oxidize so perhaps painting the carburetor with an epoxy paint will help. Just a guess. I am no chemist.
 
If you are asking about the warpage between the top of the carburetor and the base, then this is a common problem. One of the suggested cures is to put a piece of metal at the bottom of the top of the carburetor and using clamps on the ends to try bending it back down so the gasket makes a tight fit. Then check for the top to be level after bending with a straight edge. Key here is patience and not try to move it too much at a time. Also make sure the float valve is good. If the problem is between the carburetor and intake, try leveling the carburetor top where it bolts to intake with a file and straight edge. I made a spacer out of phenolic to put between the carb and intake with a gasket on each side of the spacer as was having vapor lock problems.
 
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