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The Problem with snowmobile jetski or rotax aircraft engine are they are too big. Those engine designers have way more freedom in design due to sleds...

Look at air cooled/water cooled snowmobile engines...? Loop scavenged (looper) with WAY more power per cc. The snowmobile engines usually have...

Find someone who can put the powerheads on a dyno and get real results. That would be my recommendation.

I would say that 39 mph with a 25hp is really good. Yes, get Ron Hill to help you.

Really cool pictures. I’m sure that Eddie Wolf won the A Stock Nationals at Green Lake in Seattle, Washington in 1959 in a Marchetti.

it makes more power but having the piston flat against the exhaust port rather then cocked over

WOA was considered an "Out Law" club. They made their own rules and McCullough Outboards kind of "Bank Rolled" them. One rule, APBA racers didn't...

As I recall, the two boys from Seattle with Sid Crafts were fast. I also recall that one of the two got his left side sponson knocked off in the...

1st & 2nd at Beloit in DSH with Sids were Bob Okner & Dick O'Dea both from NJ, the home state for Sid-Craft

I would try increasing the pitch of the prop an inch or so. Your RPMs went up cause you raised the engine - but your speed did not pick up much...

Hey Frank - I know it has been many years, but I would love to get my Dad a Marchetti t-shirt. Do you still have the digitized logo or any of the...

Many kinds of piston designs for the 49ci.. Far left is the 3 ring 1968 55hp, far right is the 1975hp Stinger piston (high top ring, flat top).

Then...why is the exhaust on the right side? Is the photo reversed? "Inquiring minds want to know!" Jeff

Yes, Mike Raich was the fast D ..... he set records at both Devils Lake, Lincoln City, Oregon... and Lawrence Lake, Yelm, Washington. He was fast for...

Living in Seattle, you probably remember when the bigger hydros were all cab overs until the Sid Crafts showed up. I don't recall their name, but...

I'll never forget sitting on the tailgate having an amazing conversation with Art Kennedy at the Miami Marine Stadium where a bunch of the drivers...

Same thing happened to me in the late 80s running SST140 in Augusta. Didn't worry about the fire hazard due to sitting in several gallons of high...

Well there you go... Thanks Ron. However I do know there were Catamarans prior to that, and I think they were the precursor to tunnel boats. ...

custom 49ci race engine from OMC

1978 Parker Enduro: Questions were asked about the start and the wreck at the start. I have written about my experience winning the 1978 Enduro with...

Is this still available?

What is that? Exhaust on the right hand side? Jeff

no good I'll give ya $100 to take it away...lol 31M race engine

72207 these any good

Here is the story on the 1956 Alky Nationals in Long Beach from the December 1956 edition of Outboard magazine.

Here are some Molinari tunnel race boats, in design time-frame sequence. Boat 888 the 1965 - 1966 look. Boat 46 the 1967 - 1968 look. Boat 12...

In an earlier post Cees vander Veldon talks about entering the race boat building business, and becoming a rival builder to the Molinari hull. Well...