New 850/SE/FE thread from Mod50 thread

[formeone]

Since so many complained and thought this 850 stuff was not related to the Mod50/inflatable stuff, its now spun off to this new thread of its own

mine a 49.7 cube,, we run in 850 class here or the square block 65hp from the early 70"s most everyone else race the kidney shaped70-75hp style blocks same inside almost heheheh

[850cc racer]

so yours is the block with the square exhaust cover? like about 6inches wide.. not like all the other 49ers... i have one of those blocks!!

[Powerabout]

just curious
Will the MOD 50 side plates fit on the old 3 cyl block?

[Tim Kurcz]

For Powerabout & others,

The Mod-50 uses the same crankshaft and ignition system as the 49.7 fishing motor. The early looper you talk about with narrow rectangular exhaust has no boost port - only transfers. The later engines are more potent because of the added boost port and improved internal features.

The early Mod-50's used 3-port exhaust like the 1970's fishing engines with cast in sleeves, but were later upgraded to 2-port exhaust pressed in sleeves, both using the die-cast fishing block. All had 2 boosts, 2 fingers, and one boost intake ports.

The "kidney" shaped Mod-50 exhaust cover fits all fishing blocks (with some machine work) except for the early rectangular cover engines and makes a BIG difference in power. The "pulse" tuning effect often referred to comes from this development.

Basically there are many differences in engines and specs to answer your question - after all it was a MOD class!

Tim

BTW: What elevation to you run?

[Powerabout]

Many thanks Tim
Happy New Year

So the later 2 port sleeve went into the fishing block without any block behind the bridge then?
Am I reading that correctly?
So you can fit a late MOD 50 sleeve into a fishing motor?

Cheers
Powerabout

[Fast Fred]

1.540 on a stock 49.7 75hp block goin by this APBA spec sheet, intake ports are in a high state of tune. Mod 50 from the top of the deck to the top of the exhaust port, 1.300

[Fast Fred]

So the later 2 port sleeve went into the fishing block without any block behind the bridge then?
Am I reading that correctly?
So you can fit a late MOD 50 sleeve into a fishing motor?

no chance, no way., yes block behind the bridge

[Powerabout]

Thanks Fred
I figured as much

So we have....

1.540 on a stock 49.7 75hp - Short rod
1.393 on a SST 60 - in between rod
1.300 on a Mod 50 - long rod
1.???? on a M31 - long rod

Cheers

[formeone]

cool thanks guys for your imput,,, ,, where the intake height different as well or???

[Fast Fred]