>Any knowledgable motorheads able to discuss the pros and cons of the 180
>degree, flat-crank motor? Would it be legal in WC? Would it be
>advantageous if it were?
As far as I know, it's legal. Jr Johnson & others have experimented with
such engines in the past. I have to assume it's not advantageous,
since no-one is using it now.
>It's been a long time since I read the theory on this, but basically it
>results in two cylinders firing at the same time i.e., two simultaneous
>firing pulses every 180 degrees of crankshaft rotation instead of the
>conventional one firing pulse every 90 degrees. I have heard V8 motors
>like this run at the drags and it is some kind of weird sounding.... like
>a four banger on steriods.
>What I cannot remember is what advantage this has. Flatter torque curve?
>Higher torque curve? ??? Help.
I beleive there are two percieved advantages, one being that the exhaust
can be tuned more effectively (which would give a higher torque curve).
Unfortunately it is _extremely_ difficult to fit the exhaust headers needed
to be effective with a flat crank engine into a typical stock car (unless you
move the engine forward, which is usually a very bad thing from a
A second perceived advantage, which still seems to be the subject of
much debate as to whether it really exists, is that tires seem to have
slightly more traction with a flat crank engine. The idea is that the tire
has a brief moment between torque pulses to "recover". This was a
popular idea in motorcycle racing a while back, and also on the
Mercedes Indy engine (the "stock block" version that ran at Indy,
not the CART engine).