Say guys, before I bought the Pantera I testdrove a Cerbera speed six. When you came of the gas it had this wonderful popping and banging going on witch I loved. My question is : can one provoke this on a Cleveland?
Original Post
Replies sorted oldest to newest
quote:Originally posted by suburb:
Say guys, before I bought the Pantera I testdrove a Cerbera speed six. When you came of the gas it had this wonderful popping and banging going on witch I loved. My question is : can one provoke this on a Cleveland?
I have been chasing down how to get rid of mine! Those pops are lean backfires caused by a air entering the exhaust. Could be because of a leaky gasket. In my case, the intake gasket was torn. For an intact system, it could be due to resonance or coincidence of fuel mixture. If you wanted to induce lean backfire, I suppose you could install a gulp valve in the header tubes somehow to let air in on decel.
I also love the popping and banging. My GT5 fitted with 180s will pop, bang and throw blue flame out the tail pipe which is an exciting show at night. I feel like a kid behind the wheel. However, I do not believe it is a lean condition in my case. I suspect that gaps in the 180s where the pipe slide together introduces air and ignites the residual fuel left over perhaps from scavenging.
My fuel mileage is lousy on the car and I have hesitated about leaning the mixture for fear that I would lose the flame throwing.
To each his own
My fuel mileage is lousy on the car and I have hesitated about leaning the mixture for fear that I would lose the flame throwing.
To each his own
quote:Originally posted by JTpantera:
... However, I do not believe it is a lean condition in my case. I suspect that gaps in the 180s where the pipe slide together introduces air and ignites the residual fuel left over perhaps from scavenging.
...
Lean meaning lean exhaust gas mixture. Normally the exhaust gas is rich enough, or lacking enough oxygen to ignite. Introduce O2 from some source like a leaky gasket or pipe, and you have backfire.
Another option to induce backfire would be to tinker with the PCV valve or other full vacuum port. If you could add an rpm activated valve that would open when the throttle is closed and RPM is above idle, but close when the RPM is in the idle range, then you might be able to introduce O2 in the decel stage, but not mess up the idle.
with TVR's it is their normal habitat 
When I went from the stock Autolite Carb with a damper on the throttle to the 720 cfm holley with no damper and I am on the gas and off quick I get that nice popping and banging only a couple of times. I do not believe I am causing damage by going lean it sure shocks some people on the off ramps smile!
Cool Jack how You impressed Your later wife. When I met my future wife I ignored her for a while, that pissed her off and everything went from then on 