The carbs in the picture are OMC, for some reason Selva was never able to make their carbs work and would buy OMC Mod50 carbs for their engines. When Paul Kalb got wind of this he put a stop to the...
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Selva OE
The carbs in the picture are OMC, for some reason Selva was never able to make their carbs work and would buy OMC Mod50 carbs for their engines. When Paul Kalb got wind of this he put a stop to the...
MOD 50 Port Bridge
Early Mod 50's with two port bridges did not have any special honing done to them when produced. Factory (OMC Race Group) modified motors had the bridge ground away from the piston. Not exactely...
Nos
Fred,
The first time we used NOS we just shot it in front of the carb inlet. Ran a fuel line and NOS line. Ran this at St. Louis on the V6 the same year Mercury came with brakes. Later units were...
Mod 50
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...
MOD 50 Alky Kit
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...
Mod 50
Fred, they all got squese!
Mod 50- M31
The exhaust was put on the other side to take advantage of the piston thrusting against that side on the downstroke for a better seal. This does not change the tuning effect due to firing order,...
Mod 50
We tested just about every carb combination you could think of at the time. It was possible to see a few more horsepower with a larger carb but when tested on the race course lap times would always...
Mod 50
All the 3-cylinder race engines had stops. Mark 75 is correct on the function of the reed stop. Stop height and shape are very important. Early M50 engines used 0.010" thick stainless steel reeds,...
Exhaust
Sam, you got it! Kind of like firing 1-3-2 rather than 1-2-3. Depending on the engine this can help performance.
Exhaust
Fred,
Thats a great looking exhaust but not what you want for the Mod 50. Port runners are going to be way too long. If you think about the systems used on the Mod 50 & Merc V6 they are very...
Mod 50
David,
Not sure if you have to exhaust through the midsection or can run an open stack. The motor Fred used for the Mod 50 record had the exhaust into the midsection because of the rules for Mod...
Mod 50
Fred, the block you show the picture of was modified that way because the port rib cracked and that was the only way to try to salvage the block. This is not an ideal situation and will most likely...