nitro gearcase?

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whats the difference between a reg gear case and the nitro gearcase on the short 70hp omc stinger/sprint??? and what r the advantages of a nitro?

[David]

Nitro gear case is 15:28 (1.87) prop diameter up to 13"
Regular gear case is 12:29 (2.42) prop diameter up to 14"

The Nitro advantage for a small boat is gearing. It's hard to prop a small boat with 2.42 gears to go very fast. And you want a smaller diameter prop on a fast little boat.

I don't see any advantage of the Nitro on a bigger boat. Nor do I know if you could get the Nitro gearcase from the factory with power trim.

[BarryStrawn]

In addition to the above, the bullet diameter is only 3 3/8" for the little case vs 4 1/8" on the fishin' version. The frontal area is one third smaller which is a major drag reduction at higher speeds.

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-thanks for the help, im in the process of buying the motor.... did the short sprint/stinger come standard w/ the nitro or the reg fishin L/U?
and what r the cubes on this motor?

[David]

If its 15" Stinger/Sprint, it came standard with the Nitro. 49.9 cube

[BarryStrawn]

Not always - I think a 15" 70 hp Stinger could be 1974 and came with the big case. Same for a 15" Stinger in 1973 which I think would be a 65 hp.

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how about 1986 sprint? ....im pretty sure its the nitro...
whats the approx weight of the motor? and i think its a 75hp not 70hp. im gonna try running it on an inflatable

[BarryStrawn]

If it is 15" engine and if it has the original gearcase, a 1986 75 would have the small case with 15:28 gears.

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sweet............. thankz 4 all your help!

[SCT]

Hey guys, what can you tell me about my Stinger from this info. Model #75ER78C and serial # J4948900?

Also, does anyone know of a Nitro for sale?

Thanks-

[Fast Fred]

you can make a 2to1 Nitro, for Punch, short course.:cool:

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hey fred r solid engine mounts a good idea? what boat/eng r u running?

[Fast Fred]

solid mounts are a good idea.
i'm runnin an omc looks, got a shot of me mid section for ya, with them thare Solid mounts
http://img292.imageshack.us/img292/566/pc030001ev5.th.jpg (http://img292.imageshack.us/my.php?image=pc030001ev5.jpg)
http://img292.imageshack.us/img292/4333/pc030003ox7.th.jpg (http://img292.imageshack.us/my.php?image=pc030003ox7.jpg)

[Fast Fred]

hears some Nitro's
http://img244.imageshack.us/img244/6317/p8230019kq5.th.jpg (http://img244.imageshack.us/my.php?image=p8230019kq5.jpg)
with the Works:eek: :cool: