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4-valve aircooled motorcycle heads
Posted: Sat Jan 12, 2008 10:10 am
by Wally
I post this for Michel Wilson, who was recently at a Autosport show in Birmingham, England.
"I was told that the heads are prototype castings for a new 1500cc bike
being developed for Rickman Metisse which is due to be announced in
June."
Still very interesting as it is not a 4 in line. Curieus if the two inside exhaust valves stay cool enough with this concept.
Greets,
Walter
Posted: Sat Jan 12, 2008 11:05 am
by yilon
Admittedly, it has been more than 50 years since the AJS 'triple knocker' addressed the question. The triple knocker was a three [yes 3] cam single that had two front mounted exhaust cams/valves. During the long trip up to 1,500 feet in altitude [from sea level] during the Isle of Man race, the triple knocker gave the [then European] competition two choices, 1) back off and let the AJS win; 2) burn their exhasut valves and let the AJS win. Some teams tried strategy 1), some tried strategy 2). In either case, the AJS won.
Now, they have learned a lot about air flow and cooling in the last 50 years, but I wouldn't want to be riding an air cooled four valve per cylinder motorcycle up the Isle of Man climb to 1,500 feet while chasing a liquid cooled machine. [I HATE IT when I burn exhast valves.]
Posted: Sat Jan 12, 2008 11:53 am
by eugene
You can always try to cool the exhaust valves with a RSK look-alike cooling system, if you want to use such heads in a TIV
Posted: Thu Jan 17, 2008 10:00 pm
by Piledriver
I'm curious what the bore centers and max size are
I bet those would cool just fine on a street car.