Sam: All the race engines were water cooled externally and charged cooled internally. The snowmobile was air cooled externally and charged cooled internally. By contrast, the Mazda engine is water cooled externally, but oil cooled internally. Oil cooling allows more HP, because the fuel/air mixture is not heated as in charged cooled, but adds complexity, weight and increased friction hp. The bucket and shroud weighed 35/40 lbs as I recall, add the weight of the gearcase and my guess is your guess is a little low.
Guys:
They say memory is the second thing to go. I have been corrected on my story. It was Rich McKinley that barrell rolled at Galvaston, not Bobby Whitt and Bobby Herring won the St. Louis race, not Billy Seabolt.
Last edited by Rotary John; 05-26-2009 at 05:05 AM. Reason: spelling
Guys. I can't swear all four of these engines were the latest no thru bolt vintage and even though I know all 4 were dyno tested prior to being boxed up, I don't know for sure the dyno sheets were actually packed in the boxes. Some day someone will find these engines and if I'm still around, I can identify which is what. One thing I don't recall mentioning before, the cast snowmobile flywheels were replaced with flex plate wheels some time in '75 as a weight saving measure.
Wayne, there it is in your post, it was the Conroe race I was at, I was working the pits for Rick Clausen at that race
Seems to answer where Scott. I didn't go to Conroe in 1973, but that must be where you saw them.
Great info Rotary John. I remember how deep the transoms were at Galveston. I didn't pick up on the photo with the empty motor and how the boat floated much higher until you mentioned it. Some good inside stuff.
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