Fast Fred's Secrets of the OMC MOD50's Thread #1

[Fast Fred]

Thare are three power heads, guna talk about the first one the 19s.
this is a Tradewinds motor,port exhaust standard 49ci case + .030
uses the long rods same size as the Big twin, thare are mod 50 rods,
the dif' bein the wrist pin hole, stock mod 50 rods run the big wrist pin and caged wrist pin bearing. the big twin rod is the best set up, thay make a kit to run the big wrist pin in the small rod hole with full complament bearing.
steal crank, the stock mod50 19s pistons are two ring dome style with finger port tranfur holes. the case it self is the same as the production case,
the rib under number three exhaust port is cut to let water run in to case , this moda ran no thermostat, did have a water pump, 6 amp alternater,
the exhaust exit is also cut to except the mod 50 exhaust plates.

the front 1/2 on this one has the same jog as the stock intake with 4 over 4
pedal reed blocks, the reeds also had two smaller reeds on top that sat sideways with three 1" 2bbl carbs. was lookin for 100-130oct avgas out of the box.

the Preface of the Owner Manual

" This motor has been engineered and assembled to give the professional race driver, who desires to have a motor with extra capability, a motor which incorporates very high performance with quality and workman ship."
thares more but to the point
I've heard alot about how much hp this moda made on gas, 200hp, 150hp, 135hp, not !!!!!!!!! like it or not 100hp-105hp @7200rpm
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[Fast Fred]

this is the FR-19S

[Fast Fred]

this is the 19S powerhead

[Fast Fred]

Next is the Manawa motor , got to take some pic of it,

[Fast Fred]

the second generation , after the 19s but before the 31M thare is but another
MOD50 case, vary fue were made, looks just like the 19s, but in side it is vary dif', just so happens, i got one, made about 10-12more hp than the 19s
we'll take a look at it,



and as it would be, them mercs of the time were makin far, far less hp
than thay would like you to beleve, like 60-75hp at the most

[Fast Fred]

this is the reed blocks of the 19s

[tsrt]

Next is the Manawa motor , got to take some pic of it,

Fast Fred,

Please email me topspeedracingteam@yahoo.com . I was thinking of sending sst60 powerhead to you for modification. It is outlaw in this class in our country. We can do anything to the powerhead. I’m located Malaysia. Many things to talk about!


Regards,
David
TOPSPEED RACING TEAM

[Detroit Whitey]

Fred i got to have one give me a price call me up .i would call ya but i lost your phone # any way i need a plate bad let me know

[David_L6]

100hp-105hp @7200rpm
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I wonder what those motors were turning with a racing lower unit on a tunnel hull and how many horsepower they were making at those RPM's???

[Fast Fred]

hp falls off, but that don't mean she won't keep turnin up, which will give the hull some vary long legs.