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

[Fast Fred]

Ya, stuck it.
we see that the water passes goin back to the adapter are closed,
all the water is dumped off the head cover.
Center section is Dry

[Fast Fred]

anybody Know if they Made ( the Factory) a
Mod50 FT( shiftable foot) 31M just in case i need one

[Fast Fred]

I'm thinkin no on the 31m FT,cuzz thares no toob for the shift rod. I can make one.
any way, baffels, also called stuffers, for the carbs,they keep the gas in the bowl ware it needs to be. RED would indicate alcohol resistant.

as opposed the White, witch is for fuel.

[Fast Fred]

on page 5 of the 1976, OWNER MANUAL AND PARTS CATALOG, theres a note,
says

"if alcohol Fuel is to be considered, wright to factory for special alky carbs,
fuel pump rebuild kits and full instructions for use."

lookin for them instructions, any year
thanks
FFX-61

[Fast Fred]

today, the bay is frozen still, about 1/4 mi. out,

lookin at the Homologation Sheet for OMC race Modas, in 1976 the FR-19s is listed and a FT-19s, no FT-31m Listed any year.


ice, the limitin factor.

[NERSTROM]

The alcohol kit was usually used in Europe for the OE Class. Kit included larger jets and "Gross-jet" needle seat assembly. Pump kit was just rubber material which would tolerate the alcohol. Best performance gain was had when compression ratio was increased and spark timing changed.

[Fast Fred]

was thinkin that the carbs i got would have the alcohol jets in them cuzz thay got the alcohol stuffers, and thay apear to be untouched, was thinkin the timin would need to bump up, could you say how much psi at crankin speed on gas, and then on Alcohol,
thanks

[NERSTROM]

There is some misconception on the stuffer, color did not mean gas or alky. Early stuffers were one color later ones another, no more-no less. ABPA MOD 50 was a gasoline only class. UIM OE was Alky until about 1978 or 1979 when the rules changed and it became gasoline. The FR-19's were all built for gasoline. Some European racers wanted to run with alcohol so the conversion kit was made and supplied to them. We never tested compression using cranking psi, too many variables to be accurate. We only used cc volume measured to the top of the spark plug hole. The MOD 50 engines with pressed in sleeves were a lot better than the cast blocks.

[Fast Fred]

so sounds like these carbs are most likely gas,thats cool , and the stuffers, well, yup gots some. that clears that up.
would you say 22-24cc on gas?

i do have one of them thare press in cases, with the strightin front 1/2's,got them carbs for it, guna have new liners put in it shortly, lookin a round for the exhaust plates for it, i've collected about every thing else for it.

[Fast Fred]

be getin some shots soon, of an FT, in MOFO'in Action , although, not on my hull