IMCO Shorty and Extension Box Help

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04-02-2011 | 09:51 PM

#41

AIR TIME

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From: EASTON MA.

Quote:

Originally Posted by jeffswav

Thats really only going to raise you up 1". You could go much higher than that, that will be real expensive and not a lot of speed gain, maybe 2 MPH. Just doing the shortie without the box will get you 2-3 MPH. With what you have I would take a closer look at the stellings and keep your current lower. Unless you want to raise your engine up 3" and do the raised imco box.

best bet go with stellings raise it up add 2'' shortie some guys useded the imco shaft so they could use the coupler.

04-02-2011 | 09:57 PM

#42

AIR TIME

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From: EASTON MA.

Quote:

Originally Posted by TW720HVY

So much information and misinformation (not saying your is misinformation

) since I started this project. I am starting to get very nervous now that I'm into this project.... the last thing I want to do is spend thousands for minimal gains if any at all.

I have a call into Stellings and I will see what they say.

The one thing I want to do for sure is get the E-box on now before the engine goes back in.

man if your motor was out you could of done the imco 3'', just have your tails for exhaust modified, good luck Iam shooting for late may to test mine with a couple of 5 blades.

04-02-2011 | 10:08 PM

#43

AIR TIME

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From: EASTON MA.

Quote:

Originally Posted by fireboatpilot

I've never heard of any ext. box lowering the "X" Sorry to jump in so late in the game. Even the neutral (so called) boxes are made on the slant, compensating for transom angle. I've never seen a straight box that would push the "X" down. I have Stellings boxes and in the neutral position theres a slight raise and adjustable up to 3" raise. I chose Stellings because it uses a shaft and "U" joints to connect to the engine and raising the engines wasn't required. Since I also pushed the engines forward 2' I used drive line bellhousings and trans replacers so I was able to retain the Bravo rubber couplers and save some shock to my drives.

its the set back not the x like with obs on brackets the motors are set higher on a 24'' bracket compared to a 8'' or 12'' bracket. if a boat comes with a high x from the factory and you get prop slip high ,you could add a n box and find out the slip goes down =prop is in cleaner water 12'' back which would be like having your prop 1'' deeper. my slip with the shortie was 12 to 13% with a b1 prop.ps sorry for all the posts its late and I posted as Iread. good luck and as soon as I hit the water Iwill post how my raised height worked as posted I have a few 5 blades to start with and 2 b1 drives. time for bed later guys.

Last edited by AIR TIME; 04-02-2011 at 10:29 PM.