I should have been more specific on this from the get go...
The 514 BB car is running on 93 octane. It has 10.25 : 1 compression.
It does have pretty severe run on / detonation when I shut it off for 5-15 seconds..
What causes this? How is it harmful to the motor?
Also, under full load in 5th gear it has some detonation like at 2,500 rpms or so...what causes this?
One other issue, under full throttle for 3-4 sec it emits a large, large cloud of brownish smoke/dust... what causes this?
The motor is newly rebuilt. But the last motor had the same setup same problems and ending up self destructing by chewing up the cam, clogging the
oil pump... Could this have been caused by detonation issues?
As to carb size, Demon and other makers agree that 975 cfm is about right for a built 514. Some guys even run 1200 cfm+ dominators with no ill effects. My 975 RS Demon should be right on the money.
I'm going to the dyno/carb guy on friday to work on the problem.
Any thoughts on how to approach it?