They are by far the best combustion chamber design short of a 5 valve with 3 int
2 exh.. Highest specific power output least trouble with detonation lightweight
valve gear that will go to 14k rpm without pneumatic valve gear. With it 18k rpm
is on the horizon.. a good 122 inch engine on gasoline will make 305 hp as a 4
cylinder 500 cc cylinders. At smaller displacements per cylinder 2.65 hp per
cubic inch N/A is an everyday job. They respond well to turbocharging and alky.
Nitro may not be as much of a help as it burns soooo slooooow.. I just finished
a 175 inch v-8 with twin KKK 27 turbos.. 830 hp at 8200 just breezing it at 18
lbs of boost and gasoline in endurance trim..another 1000 rpm and 10 lbs of
boost and over 1000 hp is a no brainer.. Cosworth has some 1.5L (91.5 cuin)
engines that will go over 1500 hp on alky..And this is old tech stuff. An old
Cosworth indy engine at 2.65 liter (165.6 cuin)and alky will go to 850 hp with 6
or 7 lbs of boost.. So is it better than a hemi.. ought to be obvious..
Dave
Bryan Savage wrote:
>
> Better combustion chamber. Shorter flame front travel and reduced
> stagnate end gas areas.
> The end gas areas are a primary source of combustion instability ( pre
> ignition and detonation)
>
> Very superior with gas. I don't know about fuel. (I now nothing about
> using nitro and little about alcohol)
>
> Bryan
>
> ardunbill@webtv.net wrote:
>
> >One of my West Coast Vincent friends,
> >Bill Martz, who enjoys the Ardun and LSR items I send him from our List,
> >wanted to pose a question to the technical experts here. Bill was half
> >of the Martz-Auger team that was famous in Southern California for years
> >in the '50s, campaigning a 90% nitro Vincent Black Lightning mc on the
> >dragstrips. He was the technical side, and his pal Tommy Auger was the
> >fearless lightweight rider. Some of you with white hair like me may
> >remember them from Hot Rod in that era. They sometimes got the ink.
> >
> >Bill's question is, what are the advantages of the four-valve head of
> >today compared with the traditional two-valve hemi head design(still
> >very much with us)? Thanks, Ardun Bill
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