Did UIM SD allow engine modifications and what fuel was used? Thx
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Did UIM SD allow engine modifications and what fuel was used? Thx
All UIM SD engines in the seventies must be homologated..you could take out material as long as it was within the homologation, but not add material.Quote:
Originally Posted by Ronster43
You could only use "pump gas"
So you could "blueprint" as long as you didn't add material. In other words...you could grind to max tolerances. That was different from US SD rules where you could do nothing.
My brother won the APBA EP closed-course nationals in 82 or 83. In inspection, they noticed that his cylinder head had a different finish than 2nd and 3rd place. They impounded the head and later awarded him the win when OMC approved it as "from the factory that way".
UIM also change the inspection rules in the mid eighties in the same way. You could not touch anything. Turned out very difficult to enforce. Inspection people made lots of errors.Quote:
Originally Posted by Ronster43
I preferred the UIM OD, OE, ON and OZ classes. No rules only max cc.
Back to the late seventies..more exact 1978
The Swedish Powerboat Federation changed the max cc for the SD class to a bit higher CC so Evinrude/Johnson 55 Mariner 60 and Yamaha 55 could race in local Swedish SD class races. (They where all over 700cc)
My #1 Delicato-Clerici/Evinrude 55HP
A Swedish SD Class race boat from 1978..
I was asked by OMC to try to make this engine work in the local SD class.
There was one big success..the Stockholm Grand Prix 1978..
I grabed the overall win...Well.. the race was one hour and most SE/OE boats
broke down..
As always..you win on the last lap..not the first..
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Well..the Mercury boys love to bring up Bristol 1982 when Mr. Bill won the OZ class race over the OMC V8. The fact is Renato was leading the race when his Martini sponsored titanium boat with Evinrude V8 broke down. (There is a video to confirm that)
Yes..I know..you win on the last lap..!!
The Mercury boys suddenly forgot about Bristol 1980. (The last race for the T-4 at that time frame)
Mr. Bill was leading the last race with the big bore Merc T-4..He broke down and Renato won with a much smaller Evinrude V6 CCC.
The first picture is the start of the Bristol race 1980.
Mr. Bill, Tom Percival & Roger Jenkins used the T-4.
Hard to see but Renato is in there with his #1 Molinari/Evinrude V6 CCC.
The second picture is Mr. Bill with his dead T-4.
Third picture is the headlines after the race.
Fourth picture is the Evinrude advertising after the Bristol race 1980
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Cool picture of the 45 SS.
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Ready to go to Key West 1993 to watch the Offshore race.
My Chevy truck and the Offshore 24 CC boat with 2 X 150 Evinrude V6 OceanProAttachment 484728
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Mixed from the Keys..and my Offshore 24 CC boat with 2 X 150 Evinrude V6 OceanPro.
A very good little boat..Used it a lot in Florida.
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Never did like the use or definition of the word "homologated" by the APBA technical committee. Why not say "blended", "make common", etc? Placed the entire burden of what the word meant on the poor race inspectors. UIM had it right........DIMENSIONAL.......material added or removed had no bearing. OEM was jibberish. Like these engine builders weren't dealing with their own variation? Dealers or racers who had deep pockets had a distinct advantage over the common racer. They had access to boxes of inventory to find the perfect part (weight, dimension, finish, etc). It wasn't an issue in mod or unlimited classes and the problem really stopped in its tracks with an engine claimer rule.Quote:
Originally Posted by lars strom
I always liked to call my motors "carefully assembled" I never failed inspection on one of my motors.
I got this picture from a friend of mine in Finland..
Thanks
Its a local built racing tunnel boat powered by a production Johnson 3.6 GT V8 300HP.
One of the first V8 Johnson in Finland 1985
Must have been an evil handling race boat.
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Was that motor as heavy as it looked?
The 1985 production V8 with 20 inch shaft was 540 pound.
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More about the 1985 production V8.
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