The Ford Barn

dynaflash_8 · 03-05-2012, 02:12 AM

I put a burns downdraft intake on my Model A with a single 94 (model 8ba) carburator. Car is bone stock, and figured this would be a bit better carb than the leaky warped tillotson. Plus it looks neat. So i got it all set up and running this afternoon. Went to take it out for a drive and got to the end of my driveway before POP POP POP out the tailpipe like it had just run out of gas. Would not take any throttle at all. Stopped and let it rest at idle and it would take throttle again. Not another 800 feet and the same thing. Im thinking it might be that im using the stock gravity feed from the tank, but iv seen others run a similar setup and i imagine they dont have this problem.

Any imput? Im saving my pennys for a Stromberg 81

ken ct · 03-05-2012, 03:05 AM

The carbs too big in the first place and could need work internally. It could be made to work right with a jet change and smaller power valve by some one who knows what hes doing. OMO. ken ct.I have some 81's /stroms and ford ones!

V4F · 03-05-2012, 09:32 AM

ken ct is the best at these carbs . IMHO ............. steve

Jim Brierley · 03-05-2012, 11:37 AM

Don't waste your money on an 81, a 97 will work better. I'm running three 81's on my speedster and it is not too much. Start with stock jetting and you may need a fuel pump, regulated to 3 psi max.

dynaflash_8 · 03-05-2012, 02:40 PM

what do you guys recommend for a fuel pump?

hardtimes · 03-05-2012, 03:33 PM

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Let's see a picture of your setup, before purchasing a pump.
'28/'29 tank supply is LOWER than that of '30/31 tank (you don't say which you have).
Likewise, some downdraft intakes are HIGHER than others, which of course will affect gravity flow.

Try this prior to ANY change in what you have setup now.....fill the gas tank and see if your problem (pop/whatever)still exists. If no longer exists...you've narrowed down to fuel feed,eh! If problem continues..well I'd then look a carb condition.

Bruce Lancaster · 03-05-2012, 03:52 PM

Most current 94 kits have a rubber tip inlet needle that often has a tendency to stick shut. With gravity feed there is little force to blow it open.

03-05-2012, 02:12 AM	#1
dynaflash_8 Member Join Date: Jul 2011 Location: Auburn WA Posts: 73	Pop pop pop...Need down draft help! I put a burns downdraft intake on my Model A with a single 94 (model 8ba) carburator. Car is bone stock, and figured this would be a bit better carb than the leaky warped tillotson. Plus it looks neat. So i got it all set up and running this afternoon. Went to take it out for a drive and got to the end of my driveway before POP POP POP out the tailpipe like it had just run out of gas. Would not take any throttle at all. Stopped and let it rest at idle and it would take throttle again. Not another 800 feet and the same thing. Im thinking it might be that im using the stock gravity feed from the tank, but iv seen others run a similar setup and i imagine they dont have this problem. Any imput? Im saving my pennys for a Stromberg 81

03-05-2012, 03:05 AM	#2
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Pop pop pop...Need down draft help! The carbs too big in the first place and could need work internally. It could be made to work right with a jet change and smaller power valve by some one who knows what hes doing. OMO. ken ct.I have some 81's /stroms and ford ones!

03-05-2012, 09:32 AM	#3
V4F Senior Member Join Date: May 2010 Location: ca. Posts: 2,522	Re: Pop pop pop...Need down draft help! ken ct is the best at these carbs . IMHO ............. steve __________________ V4f

03-05-2012, 11:37 AM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,089	Re: Pop pop pop...Need down draft help! Don't waste your money on an 81, a 97 will work better. I'm running three 81's on my speedster and it is not too much. Start with stock jetting and you may need a fuel pump, regulated to 3 psi max.

03-05-2012, 02:40 PM	#5
dynaflash_8 Member Join Date: Jul 2011 Location: Auburn WA Posts: 73	Re: Pop pop pop...Need down draft help! what do you guys recommend for a fuel pump?

03-05-2012, 03:33 PM	#6
hardtimes Senior Member Join Date: May 2010 Location: South California Posts: 6,188	Re: Pop pop pop...Need down draft help! Sponsored Links (Register now to hide all advertisements) Let's see a picture of your setup, before purchasing a pump. '28/'29 tank supply is LOWER than that of '30/31 tank (you don't say which you have). Likewise, some downdraft intakes are HIGHER than others, which of course will affect gravity flow. Try this prior to ANY change in what you have setup now.....fill the gas tank and see if your problem (pop/whatever)still exists. If no longer exists...you've narrowed down to fuel feed,eh! If problem continues..well I'd then look a carb condition. Last edited by hardtimes; 03-05-2012 at 03:39 PM. Reason: ...

03-05-2012, 03:52 PM	#7
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: Pop pop pop...Need down draft help! Most current 94 kits have a rubber tip inlet needle that often has a tendency to stick shut. With gravity feed there is little force to blow it open.