Don,
cool to hear stories like this but stop giving the OMC guys ideas!
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| FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's http://hpbc.ca/viewtopic.php?f=24&t=4061 |
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| Author: | Hounddog [ September 30th, 2018, 10:26 am ] |
| Post subject: | FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
Matt your'e got to like this! SD was the S750 class......T750 motors on small tunnels. OMC is tops in our T750 here. In the 1980's overseas the top runner was a yamaha/mariner 60 hp https://www.screamandfly.com/attachment ... 1500306975 Originally Posted by lars strom We tried the new stock Evinrude 60 2 cyl. 1980 when it was released from OMC in the UIM SD class but the Mariner 60 was much faster. (Also 2 cyl). Bertil Wik was racing the Mariner 60 in the UIM SD class and he won every SD class race for years. He got the nick name "Super Bertil" from that era. Now the bad news. In the USA they were able to get 70HP out of the mid 1980's OMC motor. ANTHONY McCULLOCH On a modified 45 powerhead we were running #63 mains after: 1- porting reed blocks & using carbon reeds w/o stops 2-adding velocity stacks to carbies 3- mill head more than 45 specs 4-matching ports block w/sleeves 5-dry out and coat 45ss exhaust tuner Some of the other things can not mention a public forum but things above were considered fundamental to get a 45ss to go from 6,200 on the test wheel to turn 7,000 or an increase of about 8 hp = 70hp on 93 octane gas. Did you ever get your critch going?...what kind of performance did you get out it? We are running high 60's @ 7200 rpm with great acceleration. same rpms with other props means we are up against pipe Fixing to go to 1.87 gearcase with lowater pick-up and some other things. Will test on sst60 test wheel. |
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| Author: | mattmak [ September 30th, 2018, 1:18 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
Don, cool to hear stories like this but stop giving the OMC guys ideas!
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| Author: | craig737 [ September 30th, 2018, 5:31 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
Ha Ha! I'm on it! |
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| Author: | Hounddog [ October 1st, 2018, 11:52 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
The interesting fact about the T750 twin cylinder motors is the good models were made in the early 1980's. After that the outboard manufacturers change those models to 3 cylinders. The twin cylinder models were built very well and many twin models became their COMMERCIAL model. The horsepower rating was crankshaft rating in the early 1980's. When the motors became prop shaft rated their hp rating was normally 5 hp less. So the 60 hp models are 55 hp at the prop. There is only ONE motor T750 twin that had a crankshaft rating over 60 hp in the early 1880's The 1982 SUZUKI DT65ESZ was 65 hp at the crank. So it would be 60 hp at the prop. https://www.brownspoint.com/store/pc/suzuki/dt65.asp PDF is on the link https://www.youtube.com/watch?v=x47rk4cYQNk The video shows this motor has very big carbs, and the parts book shows very large reed cage with 4 four pedal reeds and a small tuner. Got to like the reeds....http://www.boyesen.com/power-reeds-257.html With the same mods as the OMC listed above.....it should be a plus 70 hp motor in race prep.. Maybe we can get people interested in building some T750 motors this winter. |
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| Author: | LittleCharger [ October 2nd, 2018, 11:05 am ] | ||
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's | ||
T750 guys are gonna be in trouble next year!
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| Author: | craig737 [ October 2nd, 2018, 12:45 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
Paul does this mean you want to sell your existing t750 motor? lol |
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| Author: | LittleCharger [ October 2nd, 2018, 5:04 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
craig737 wrote: Paul does this mean you want to sell your existing t750 motor? lol Jes doesn’t have that much confidence in my mechanical abilities with a chizler 
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| Author: | sheuninck [ October 2nd, 2018, 8:33 pm ] |
| Post subject: | Re: FOUND SOME INTERESTING UIM SD CLASS HISTORY..1980's |
LittleCharger wrote: T750 guys are gonna be in trouble next year! https://www.screamandfly.com/showthread ... -outboards |
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