Facts about Evinrude/Johnson racing outboards made my OMC

[powerabout]

Hi Lars
Do you know where the uim class letters came from oe on oz etc?

[lars strom]

Hi Lars
Do you know where the uim class letters came from oe on oz etc?

Well..not sure what you mean but for example..UIM SE - S was for sport (some rules for the boat and production outboards) and E for the cc between 700 to max 850cc..UIM OE was O for no rules and E for 700 to max 850 cc.
Same with UIM SD and OD..but less cc.
Same with UIM OA-OB-OC etc..all Konig hydros back then with no rules only minimum and maximum cc.
UIM ON was no rules boat or engine but between 1500 to max 2000cc
UIM OZ was no rules and unlimited everything.
Must be outboards in all the classes above.

[WaterZebra]

Well..not sure what you mean but for example..UIM SE - S was for sport (some rules for the boat and production outboards) and E for the cc between 700 to max 850cc..UIM OE was O for no rules and E for 700 to max 850 cc.
Same with UIM SD and OD..but less cc.
Same with UIM OA-OB-OC etc..all Konig hydros back then with no rules only minimum and maximum cc.
UIM ON was no rules boat or engine but between 1500 to max 2000cc
UIM OZ was no rules and unlimited everything.
Must be outboards in all the classes above.

What were UIM production criteria in terms of units built?

The APBA had this laughable rule regarding outboards that they had to be capable of being bodily (human) lifted from the transom. (LOL) Trying do that with a 400+ lb 4 stroke these days? Only thing I saw that came close to this rule was 2 people with a pipe and lifting eye taking V6 powerheads off. I never saw anybody trying to do this with OMC V8s either.

Only the Mod U APBA class essentially allowed you to experiment and tinker with stuff. Even the MOD and Formula classes had some form of constraints. I used some classes of racing to "test" things because of race site rescue personnel being handy (I couldn't afford to buy a "Lake X") and even offered to sacrifice my points just to run and collect data. When my co-racers couldn't stop complaining about even those concessions, it started to become easier to stay home and start selling equipment.

The engine claimer rule was a great idea for the stock classes because I was amazed at the great lengths some racers went to stretch the production engine technical rules.

[TimK]

Like new for sale by Javier Reveron.




Attachment 454302

Hello Lars,
I'm interested. Call or text two four 8 - seven seven 0 - six eight nine 7. Thanks!
Tim

[oldschoolltv]

Always wanted to put a 45ss on a fliver boat

[lars strom]

Hello Lars,
I'm interested. Call or text two four 8 - seven seven 0 - six eight nine 7. Thanks!
Tim

Hi Tim,
I did see the Johnson SST-45 for sale on FaceBook and I think this link is to the seller.
https://www.facebook.com/javier.reveron.3

[lars strom]

What were UIM production criteria in terms of units built?

Thats a very good question..if I remember right the outboard factories was suppose to build 1,200 units of a specific outboard model to be approved by UIM as a standard production outboard legal in the SE class.
Back around 1970 both Konig and Carniti built the SE class outboards below but we all know at that time they where not even close to 1,200 units.
UIM change the rule and the factory must promise to build 1,200 units over a few years.
OMC started doing the same thing 1973 with the 65SS..Merc followed by the 650 XS.

[lars strom]

Hello Lars,
I'm interested. Call or text two four 8 - seven seven 0 - six eight nine 7. Thanks!
Tim

Hi again Tim..
I guess the seller have three new SST-45. Please contact him direct if you are interested.
Not sure how this Whatsapp works.

[manuelr_ve]

Hi thank Lars. My WhatsApp +584249647192

[lars strom]

Dennis and Dewey Berghauer at Havasu, 1967. It would have been an easy win for them, but they ran out of gas.
Thanks Ron Hill for the picture.

[powerabout]

Well..not sure what you mean but for example..UIM SE - S was for sport (some rules for the boat and production outboards) and E for the cc between 700 to max 850cc..UIM OE was O for no rules and E for 700 to max 850 cc.
Same with UIM SD and OD..but less cc.
Same with UIM OA-OB-OC etc..all Konig hydros back then with no rules only minimum and maximum cc.
UIM ON was no rules boat or engine but between 1500 to max 2000cc
UIM OZ was no rules and unlimited everything.
Must be outboards in all the classes above.

Thanks but I meant where did the letters come from, I guess just made them up?

was OZ always there but not used till the V8 or it came to fruition when OMC needed that class?

[lars strom]

was OZ always there but not used till the V8 or it came to fruition when OMC needed that class?

Well..OMC raced the OZ class way before the F1-V8..The Rotary and the CCC was OZ class engines...and the Merc T4.

[powerabout]

Well..OMC raced the OZ class way before the F1-V8..The Rotary and the CCC was OZ class engines...and the Merc T4.

of course, thanks for that
So ON and OZ came about at the same time?

[Mark75H]

Thanks but I meant where did the letters come from, I guess just made them up?

was OZ always there but not used till the V8 or it came to fruition when OMC needed that class?

Yeah, the last group of letters were just made up by UIM, supposedly to avoid confusion (make class ID clearer)

A, B, C, D, E, F, G, I, J, N are basically sequential from 250cc to 2,000cc (250, 350, 500, 850, 1000, 1200, 1500, 1700, 2000)

ON was around for a while before OZ

[lars strom]

of course, thanks for that
So ON and OZ came about at the same time?

Well..in late sixties there was only the the smaller cc in line 6 Merc and OMC V4..not even ON..more like OI..over 1,000 cc but less than 1,500 cc.
My guess is ON and OZ was in the UIM rule book about the same time..maybe ON first.
The OMC Rotary won the UIM OZ class 1973 in Windermere,UK.

http://svera.se/blogg/omc-and-the-rotary-outboard-took-the-overall-win-in-windermere-1973/