how come my barry grant carbs won't work on my tunnel ram?

Question

I have a ford 302 motor with a tunnel ram. I bought 2 barry grant 525 vacuum secondary carbs road demon jr. carbs. part # 6282020vm when I get on the gas i get a back fire from the carbs and they are running extremely rich!!! how do i fix this? the backfire is extremely bad when i punch it in 2nd gear. I am have a t5 trans. I have adjusted the bowls and put smaller power valves in it to get it to run more lean. that hasn,t worked.

Answer 1

Question - did you have other carbs on the Tunnel Ram and if so how did it run?



If this is a change of both intake and carbs it could be a larger number of things (the number of items that are possible issues are narrowed if this is only a carb change and it is running poorly)



Generally to run a tunnel ram you need pretty deep (rear) gears and a pretty radical cam. I suspect you know this.



Personally if this is only a carb change I would look for something else at this point - timing and advance would seem to be possible candidates

Answer 2

A 450 cfm carb as an handiest foremost use carb is just too small to feed a 351 Windsor engine. U desire a 550-six hundred cfm carb to have a well sufficient float to role adequately. The tunnel ram will paintings at the inventory motor however U can have an excessive amount of quantity with the inventory cam and the engine will lavatory out on acceleration. U might re-jet the carbs and it is going to run greater however your great wager is to get a 550 to six hundred cfm carb and four barrel manifold and set up it.

Answer 3

The main thing for a tunnel ram carb is to have a big punp shot for the accelerator pump, 50cc,

This is to overcome the smaller vacume signal in tunnels,sounds like you may need smaller jets in the primary circut as well. BG does have tech support, email them with your motor size,gear ratio,trans,camshaft lift and duration, and if its a street or race car, and they will get back to you with jet sizes,pump shooters,PV ect.