Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Boat Engine 383
Thread: Boat Engine 383
View Single Post
  #20 (permalink)  
Old 02-23-2013, 09:05 AM
bondo's Avatar
bondo bondo is offline
Last photo:
Join Date: Nov 2002
Location: Chaumont Bay N.Y.
Posts: 967
Wiki Edits: 0

Thanks: 9
Thanked 17 Times in 17 Posts
Originally Posted by F-BIRD'88 View Post
Originally Posted by crussell85
Is this a bad out drive?
I'm not real up on this Penta drives. I am of the opinion they are light duty.
This hi perf 383 motor build recipe I laid out is no wimp.

Hot rodding a boat is not the same as hot rodding a car.
It is never cheap.

A Mercruiser Alpha drive (V8 {1.5:1 ratio} in good condition is the minimum.
Mercruiser will tell you you need a Bravo Drive for this engine.

Any all V6 engine drives will not work.
The stock default thru the drive exhaust routing will not work.
Ayuh,.... I believe you'll find that the SX drives are cone-clutch drives, which are miles ahead of the Merc Alpha drives, more like the Bravos, but not quite as heavy duty...

It's a dependable drive up to 300 hp, 'n still dependable over that, if the operator has self-control over his righthand...
in other words, skip the WOT jackrabbit starts, 'n yank back on the throttle if by chance ya clear the water, 'n catch air on a wave...

'n,... The thru-prop ain't so much the problem, but the open plenum exhaust manifods are the choke point in the exhaust flows...
The vortex created by the prop, actually helps pull the gases out...

Originally Posted by F-BIRD'88 View Post
If the SX drive on your boat is not in excellent condition do not hot rod the engine.
A worn drive will not last behind a powerfull engine. A 4 cyl V6 drive or drive for a 305 is light duty and usually the wrong internal ratio.

If this is a light duty drive just enjoy your boat for what it is.
Or it will soon become a lawn/driveway ornament.
Only the Ratio changes, each drive is as strong as it's sisters....

'n, of course, a Worn out drive isn't dependable, regardless the amount of power applied...

There's No reason the OP shouldn't move forward with his Plan,...
383s are stuffed into boats, quite regularly...

If crussel would like a more Marine rated conversation 'bout this,...
Feel free to stop by iboats boatin' forums,...
There's many conversations there, 'bout this exact thing...
Reply With Quote