Thread:

prop size for a hot rod cruizer

what would be a good 2 blade prop size for 800ish hp in a 20' cambell tunnel v-drive, th400, unknown gears at this time

thanks, jeremie

I would say the one it came with.

Originally Posted by vdrive502

I would say the one it came with.

know thats a shoot from the hips answer you know of any boat that run bitchen with the gears and prop from a diff hp motor

Originally Posted by Scapegoat

Worthless with out gear size.

then i will go try too figure the gear size real quik

Originally Posted by 76Miller

Germ, call Ron Braskma (RB Props) or Prime Marine. They could probably get you pretty close the first time around. I have a set of 22's that I want to get rid of, but they might be to small for your application ? Is this that all white cruiser you had at the Avi a few years back ? You making the CP deal ?

no this is a new to me 1976 20'cambell tunnel v-drive cruiser th400 12*box i think got my race motor in it then blew the tranny should have the tranny back by the end of next week at the latest

not sure on the gears but after 10 rotations of the input shaft the output shaft rotated 23-7/8 turns. at the present time the boat has a 12/15 ss 3 blade on it

Originally Posted by 78CoLeBBF

not sure on the gears but after 10 rotations of the input shaft the output shaft rotated 23-7/8 turns. at the present time the boat has a 12/15 ss 3 blade on it

uuuh.. You sure?? That's comin' up on 140% over.... That's quite the gear set..

well i know for sure 1 rotation of the input shaft is 1-1/4 of the out put shaft. i probably got something mixed up when trying to keep count with the 10 revolutions of the input shaft

Originally Posted by 78CoLeBBF

well i know for sure 1 rotation of the input shaft is 1-1/4 of the out put shaft. i probably got something mixed up when trying to keep count with the 10 revolutions of the input shaft

You have 25's