steer me right! 20' allie

**Taver** · 06-13-2011, 07:30 PM

hey guys, just paid for a 1976 allison 20'. $500

! Ive got myself an 88 200 blackmax, bobs cone lower, and a jackplate waiting to go on it when i pick it up, i was looking for a good starting point for a prop for speed, i will definatly be doing absolutly NO skiing with this rig!

Any help would be appreciated

**Juggernaut** · 06-14-2011, 12:34 PM

Unless there's someone on s&f that has a similar boat, you're going to have to get it wet and try it out. then post peak rpm, top speed, holeshot ,engine height, prop pitch/style, and setback. With that info we can tell you how to tune in you setup.

**H20WKD** · 06-14-2011, 01:02 PM

Contact Todd at Hydromotive, KNOWS props and Ally's...http://www.hydromotive.com/news.html

**Taver** · 06-14-2011, 02:52 PM

Juggernaut, that is a very valid point! i have a couple props laying around for my buddies viper, he said i can try some of those out, a mix of choppers and cleavers. Thanks for the contact h20, i will definatly give him a shout

**H20WKD** · 06-14-2011, 04:26 PM

Originally Posted by Taver

Juggernaut, that is a very valid point! i have a couple props laying around for my buddies viper, he said i can try some of those out, a mix of choppers and cleavers. Thanks for the contact h20, i will definatly give him a shout

Taver, Have you been to the Allison Forum yet? If not, stop over lot of good people and info.

Pic's of our GSE, at Hydromotive, setting up prop height and getting a general check-up on our way from picking up in ARK.

Last Season on the "Big Water"

**whipper** · 06-14-2011, 05:48 PM

Like Robert said above. Join the Allison Owners Site. Its a forum like this one and very active so youll get answers right away. Oh and a big welcome to the Allison Family!

There will be lots of guys that can steer you right in setup with the Black Max in regards to setback, motor hight,props etc.. Hears a link. Just register then you can see the whole site. Between this site and Allison owners your need are covered. There are many other sites also but these two for you will work best for now. http://forum.allisonowners.com/index.php

Regards

James Watson

**Jack** · 06-15-2011, 02:02 PM

What model is your Allison?

**dbug10** · 06-15-2011, 06:09 PM

I ran a 30 Hoss on mine it was a 20' 78 or 79 model ran very good

**Taver** · 06-16-2011, 05:12 PM

its a 1978 gt20, the jackplate i have for it has a 7" setback

**perfmarine1** · 06-16-2011, 05:38 PM

Stock 200 14 1/2or1/4X 26 Hoss or 14'X 28 Hoss maybe Triton 1. Start 1" below

**Jack** · 06-17-2011, 07:37 AM

GT-20’s like round ear props and they like the prop down in the water. As stated start at an inch or inch and a quarter with 26p prop. Depending on the condition of the hull bottom GT-20’s run with their nose in the air. Be careful letting off the throttle quickly at speed they can get squirrelly. 7in. set back should be fine, mine is 8in. You will need to keep weight on the port side when running solo with side steer. With this setup you should run in the low to mid 80’s. Once you’re comfortable with the setup play with raising the prop and try all the props you can find. Good luck.

**Taver** · 06-18-2011, 06:17 AM

the engine is a little better than stock, not much work done, just reeds, and big bore carbs. I plan on mounting the battery on the port side to help with weight distibution a little. i have a 26 chopper that was modified to a 28, i might try that first, but i do have a stock 26 chopper i could borrow from a buddy. thank you for all your input guys