The Ford Barn

broommaker · 10-19-2012, 02:59 PM

We got the timing set dead on, new set of points, purrs like a kitten. A couple days later started backfiring, don't idle good at all and when you acccelarate it wants to backfire bad. It has a Tilly Model x carb, I removed it everything looked good except the flange to the manifold was warped, got it flat by sanding on a marble slab with sand paper, the top and bottom half of carb was warped got it flat by sanding on the marble slab, except the top half. I removed all parts and gaskets and replaced screws and three clamps, caught my wife gone, placed it in the oven at 350 degrees for 30 min. let cool. Put it back togather and it is still backfiring. With the engine running and spraying either in the front of the manifold near no. 1, engine seem to smooth out, must be manifold leak don't you all think, new gaskets and be sure mating surfaces of manifold are a good flat surface. When you accelrate it will backfire so bad it don't have power to pull itself. Am I on the right road, any help will help...

Jim, the ole broommaker

700rpm · 10-19-2012, 03:07 PM

It sounds like it's running lean. Maybe sucking air somewhere, or maybe you got some grit in the gas that's obstructing your carb jets. I don't know from Tillotsons, only Zeniths, but a manifold leak is a good place to start.

It could be a bad condenser too, or old ethanol gas.

painterrick · 10-23-2012, 01:47 PM

I would bet on an air leak somewhere carb,intake ?

BILL WILLIAMSON · 10-23-2012, 02:31 PM

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The Dog & I are at the door, we can't hear it, goose it two or three times so we can diagnose it. Bill W.

10-19-2012, 02:59 PM	#1
broommaker Senior Member Join Date: Oct 2011 Location: Reynolds Sta. Ky. Posts: 106	1929 Model A backfiring We got the timing set dead on, new set of points, purrs like a kitten. A couple days later started backfiring, don't idle good at all and when you acccelarate it wants to backfire bad. It has a Tilly Model x carb, I removed it everything looked good except the flange to the manifold was warped, got it flat by sanding on a marble slab with sand paper, the top and bottom half of carb was warped got it flat by sanding on the marble slab, except the top half. I removed all parts and gaskets and replaced screws and three clamps, caught my wife gone, placed it in the oven at 350 degrees for 30 min. let cool. Put it back togather and it is still backfiring. With the engine running and spraying either in the front of the manifold near no. 1, engine seem to smooth out, must be manifold leak don't you all think, new gaskets and be sure mating surfaces of manifold are a good flat surface. When you accelrate it will backfire so bad it don't have power to pull itself. Am I on the right road, any help will help... Jim, the ole broommaker

10-19-2012, 03:07 PM	#2
700rpm Senior Member Join Date: May 2010 Location: Portland, Oregon Posts: 5,903	Re: 1929 Model A backfiring It sounds like it's running lean. Maybe sucking air somewhere, or maybe you got some grit in the gas that's obstructing your carb jets. I don't know from Tillotsons, only Zeniths, but a manifold leak is a good place to start. It could be a bad condenser too, or old ethanol gas. __________________ Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole.

10-23-2012, 01:47 PM	#3
painterrick Junior Member Join Date: Sep 2012 Location: Sapulpa,Oklahoma Posts: 16	Re: 1929 Model A backfiring I would bet on an air leak somewhere carb,intake ?

10-23-2012, 02:31 PM	#4
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: 1929 Model A backfiring Sponsored Links (Register now to hide all advertisements) The Dog & I are at the door, we can't hear it, goose it two or three times so we can diagnose it. Bill W. __________________ "THE ASSISTANT GURU OF STUFF"