<VV> Re: VirtualVairs Digest, Vol 31, Issue 7

[Tony Underwood]

At 10:24 AM 8/2/2007, ssmyers at adelphia.net wrote:



>Since all the heat is at the bottom ( exhaust side of head) is it 
>nuts to consider running the air the other direction ? From bottom 
>to top, and out ? So the cool air hits the bottom first? Not to 
>cmplicate everything
>  _______________________________________________

Why not run headers, with individual runners angling out the sides, 
thus eliminating that hot exhaust manifold which would otherwise be 
radiating several thousand watts worth of heat back onto the bottom 
of the engine...?   Spit it out the exhaust and not worry about 
it.   A lot of heat would be eliminated this way, simply by keeping 
it from radiating back onto the bottom of the engine.   Exhaust 
headers have long since proven to aid engine cooling in almost any 
engine simply by helping to get rid of hot exhaust gasses quicker and 
via a pathway which doesn't involve heat radiation back into the engine.

I've been well aware of how much raw heat sits there in those iron 
exhaust manifolds... eliminating them goes quite a way toward helping 
the engine remain cooler, especially on "cookdown" when a hot engine 
is shut off and sits there tinking and clinking, soaking heat off the 
iron manifolds into the heads and boiling the gas out of the carbs etc.



tony..