backfiring through stromberg 97
 

I replaced the engine my 30 Tudor due to the previous engine snapping its crank. This rebuilt engine is an inserted non pressurized engine with snyder head on top. The distributor is a petronix 12 volt and the carb is a new stromber 97 fed from a low pressure regulated fuel pump.

The engine was timed at top dead center and the started. once started the engine will idle, but when the accelerator is pressed it back fires out the top of the carb. If the accelerator is pressed further the backfiring gets worse.

I did a compression check and all cylinders read exactly 60#.

Might any of you have any ideas where I should look next.

Thanks,

Dave

Re: backfiring through stromberg 97
 

Recheck the timing marks, they may be off.

Re: backfiring through stromberg 97
 

Sorry but in my opinion the 97 is a little over kill on a model "A". I think your flooding out the engine. ken ct.

Re: backfiring through stromberg 97
 

May be to lean. It all depends on a lot of things, Manifold, timing, cam, carb.
I would try a bigger jets.

Re: backfiring through stromberg 97
 

Factory 97 jets were 0.045 with a #65 power valve. Available jets go down to 0.033. You need a special jet wrench to remove them. You can check the size in place if you are careful with wire size drills. Vern Tardel has a book about Stroms. LINK

Re: backfiring through stromberg 97
 

Spitting back is caused by either too lean or too retarded spark. Check the operation of the accelerator pump. One 97 is definetly not too big for the A, I am running 3 of the 81's on my speedster with great success. Jets are stock.

Re: backfiring through stromberg 97
 

Re: backfiring through stromberg 97
 

A stock cyl head should have more than 60# comp.you should have a lot more than that with a 5.5 head.Seems like its running too lean to me.