Facts about Evinrude/Johnson racing outboards made my OMC

[lars strom]

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[2us70]

How are you doing with all the rough weather up there?

[lars strom]

How are you doing with all the rough weather up there?

Thanks for asking. Well..Friday night around 7PM we got some bad weather. Heavy rain/wind and tornado warning around the lake area.
No damage and the storm traveled east and did heavy damage in western Illinois, Kentucky and TN.
Yesterday we went to a Christmas party and had some fun..

[WaterZebra]

Attachment 497929

That mid section does not look like a Mod 50? It looks like a SST45 or 45SS mid?
Can a Mod 50 powerhead be bolted to a SST45 mid? I wouldn't think a SST45 gearcase would last too long powered by a Mod 50 engine? Maybe a kilo but not lap racing.

[powerabout]

That mid section does not look like a Mod 50? It looks like a SST45 or 45SS mid?
Can a Mod 50 powerhead be bolted to a SST45 mid? I wouldn't think a SST45 gearcase would last too long powered by a Mod 50 engine? Maybe a kilo but not lap racing.

The mid was a one off I was told.
2cyl and 3 cyl powerhead bolt surfaces are completely different

[lars strom]

It was a modified short shaft 3 cyl. mid section used 1975..(The 45 SS mid section came many years later)
I used a similar 3 cyl. powerhead in a factory OE class boat 1975.
More about that here:..https://svera.se/blogg/racing-histor...-factory-1975/

Yes..it's Jimbo..he told me the record story.

[lars strom]

Roger Jenkins won the 1975 UIM OE class World title with a similar power-head on a racing mid section. He drove a Johnson and I drove the Evinrude.
The World Championship race was run in Aix-les-Bains, France.
I was still struggling after my big crash..Roger won pretty easy over Renato and Bob Hering racing the Merc 3 cylinders.

[lars strom]

OMC did have a APBA Mod 50/UIM OE class racing mid section/gearcase 1975.

Roger Jenkins raced a Johnson and I the Evinrude..here is a link for more:..https://svera.se/blogg/uim-oe-class-racing-1975/


Regarding the success for the UIM SE class Merc 650 XS in Europe...I get to that later...

[V pads]

Isn’t that an Eldredge lower on the mod 50?

[ron54]

Thanks for asking. Well..Friday night around 7PM we got some bad weather. Heavy rain/wind and tornado warning around the lake area.
No damage and the storm traveled east and did heavy damage in western Illinois, Kentucky and TN.
Yesterday we went to a Christmas party and had some fun..

Damn Lars, I wish I was as good looking as you then all them perty girls would hang on my arm..lol

[lars strom]

Isn’t that an Eldredge lower on the mod 50?

@ron54 Well..Thanks..some days are better than others..all friends of mine and Carina was keeping an eye on me..

I dont know what lower unit Fred Hauenstein used for the little hydro/Mod 50 record.
We used a different mid section and a V4 racing gear-case for tunnel boat racing in the OE class 1975..
Later 1976 the completely new OMC CC came for APBA Mod 50/UIM OE class.

[Instigator]

Didn’t catch that but looks right to me.

Isn’t that an Eldredge lower on the mod 50?

[lars strom]

....Regarding the success for the UIM SE class Merc 650 XS in Europe...I get to that later...

I did read somewhere else about the Merc 650 XS was successful in Europe..
Well..in Europe the 650 XS was raced in the UIM SE class and the Offshore E class..the two classes I raced in at that time.
The answer is the 650 XS could not compete with the production OMC 3 cyl short shaft and even less against the FT-19S.
In all the SE/E class races 1975 and 1976 no win for the Merc..
Here is the first meeting..


Beating the new SE Class Merc 650 XS was easy 1975…but a long story the first time..!!


The Scandinavian UIM SE Championship 1975 took place in Forsaa, Finland.

Around 25 boats were in place at this beautiful Lake, and Mercury had just released the new 650 XS UIM SE class race engine and lots of people was hoping the new Merc could give the OMC drivers a run for the money.
Driver Bo Nilson (6) was backed up by AGB, the Swedish distributor for Johnson and I by Huzells, the Swedish distributor for Evinrude. (1)
The strongest Finn was Mercury’s Bimbo Aminoff and a few more drivers from Denmark
and Norway with the new Merc.
The rest was using OMC 3 Cyl. 75 Hp. Four heat and three counts as normally and a clock start.
I did not know how strong the new Merc was, but I was very well prepared and after
the first heat the good news was that the new Merc was no match (sorry
Mercury) and the fight was as usually between Bo (6) and me (1) and some other OMC
drivers.
In the second heat Bimbo Aminoff took the lead but after a few laps I past him and so did Bo but I made a mistake in one turn and Bo past me
for the win.
Well, I do not remember exactly but it came down to the last
heat and the winner of that heat was the overall winner of the race and I was
the lucky one again with only to tens of a second over Bo Nilsson, and I was now
the Scandinavian Champion for the third consecutive year.
Well not yet, because third was Mercury’s Bimbo Aminoff and he filed a protest.
Bo and I did not have any spray paint on our gear cases.
You where allowed to sharpen the skeg, and sand on the gear case if you still was within the template.
We pass that test easy, but the Chief technical inspector said that you must spray paint the gear case, and ours was just polished aluminum
so he disqualified Bo and me.
Bimbo Aminoff was now declared the winner and Bo Nilsson went nuts.
I know how angry he can get, and it turned ugly. After a major argument we left for Sweden and straight to Roland Rosenholtz, the Swedish Power Boat Federations chairman to tell him the
story, but he was already informed.
Mr. Rosenholtz made a few phone calls to Finland and UIM.
“There was nothing in the UIM rule book saying the gear-case must be painted/or not painted”
After a few days I received the Trophy and the price money
from Finland and I was officially the Scandinavian Champion 1975.
Thank you Roland Rosenholtz

Next story here….https://svera.se/blogg/racing-histor...secutive-year/

The Swedish Daily News Paper-Dagens Nyheter July 7 1975..(first picture)

[WaterZebra]

I did read somewhere else about the Merc 650 XS was successful in Europe..
Well..in Europe the 650 XS was raced in the UIM SE class and the Offshore E class..the two classes I raced in at that time.
The answer is the 650 XS could not compete with the production OMC 3 cyl short shaft and even less against the FT-19S.
In all the SE/E class races 1975 and 1976 no win for the Merc..
Here is the first meeting..


Beating the new SE Class Merc 650 XS was easy 1975…but a long story the first time..!!


The Scandinavian UIM SE Championship 1975 took place in Forsaa, Finland.

Around 25 boats were in place at this beautiful Lake, and Mercury had just released the new 650 XS UIM SE class race engine and lots of people was hoping the new Merc could give the OMC drivers a run for the money.
Driver Bo Nilson (6) was backed up by AGB, the Swedish distributor for Johnson and I by Huzells, the Swedish distributor for Evinrude. (1)
The strongest Finn was Mercury’s Bimbo Aminoff and a few more drivers from Denmark
and Norway with the new Merc.
The rest was using OMC 3 Cyl. 75 Hp. Four heat and three counts as normally and a clock start.
I did not know how strong the new Merc was, but I was very well prepared and after
the first heat the good news was that the new Merc was no match (sorry
Mercury) and the fight was as usually between Bo (6) and me (1) and some other OMC
drivers.
In the second heat Bimbo Aminoff took the lead but after a few laps I past him and so did Bo but I made a mistake in one turn and Bo past me
for the win.
Well, I do not remember exactly but it came down to the last
heat and the winner of that heat was the overall winner of the race and I was
the lucky one again with only to tens of a second over Bo Nilsson, and I was now
the Scandinavian Champion for the third consecutive year.
Well not yet, because third was Mercury’s Bimbo Aminoff and he filed a protest.
Bo and I did not have any spray paint on our gear cases.
You where allowed to sharpen the skeg, and sand on the gear case if you still was within the template.
We pass that test easy, but the Chief technical inspector said that you must spray paint the gear case, and ours was just polished aluminum
so he disqualified Bo and me.
Bimbo Aminoff was now declared the winner and Bo Nilsson went nuts.
I know how angry he can get, and it turned ugly. After a major argument we left for Sweden and straight to Roland Rosenholtz, the Swedish Power Boat Federations chairman to tell him the
story, but he was already informed.
Mr. Rosenholtz made a few phone calls to Finland and UIM.
“There was nothing in the UIM rule book saying the gear-case must be painted/or not painted”
After a few days I received the Trophy and the price money
from Finland and I was officially the Scandinavian Champion 1975.
Thank you Roland Rosenholtz

Next story here….https://svera.se/blogg/racing-histor...secutive-year/

The Swedish Daily News Paper-Dagens Nyheter July 7 1975..(first picture)

So, did the UIM update the rules for gearcase paint?
An old stock outboard racer taught me a trick to do with any running surface that had contact with water. Spray paint with flat black primer and wet sand with 400 grit.
The fine sanding scratches kind of form a "film" of bubbles with the water. Very similar to the slime fish have on their scales. Always did this with Merc Phantom Black and nobody noticed (LOL).

[2us70]

The Mercury inline motors all shared the same basic design. By the mid 1970s that design was pretty much maxed out. I found out that trying to keep up with those fresh designs was hard. In 72 and 73 the 650s were not competitive in the production class but still ok in the sport class. after 73 not so much.