Changing from a Gm 4cyl to a V^6?

[vokitsdf]

Have a 1987 Bayliner Capri with OMC Cobra and GM 3 L. engine that all of a sudden filled the crankcase with water. Engine was rebuilt 6 months after purchase new, because dealer failed to allign and set up correctly and main bearings scored. <br /><br />Is there a V6 engine that will bolt to the flywheel cover, or do I need to change outdrive with this conversion? There is only room to swing a 12 3/4 dia. prop on the original unit.

 

[anesthes]

Re: Changing from a Gm 4cyl to a V^6?

THe outdrives are different ratios but you can prop the difference, or cam the difference. You want the RPM range to be about the same if you cam the difference.. You really need a donor marine engien though for all the accessories, and make new motor mounts.<br /><br />-- Joe

 

[Colorado Boat Nut]

Re: Changing from a Gm 4cyl to a V^6?

good question i have been pondering the same thing lately, any ideas what the 6 would be out of?<br />wouldn't a Buick Grand National Turbo V-6 be enough<br />it was about a 14 second car as it came from the factory if i remember correctly<br /> im not sure how many HP but im sure it will take the high rev's well and make lots of them <br />What about the exhaust though any ideas on that<br />hum <br />see ya <br />CBN

 

[Spidybot]

Re: Changing from a Gm 4cyl to a V^6?

Just a word of caution:<br /><br />Automotive engines and marine engines are not the same.<br /><br />Yes, the blocks and some basic parts but all the alterations to make it seaworthy involves a bunch of issues. First of all the matter of safety (electrics designed to run in a closed compartment), fuel equipment (more rigid) etc. Next the actual rebuild of head (cooling system, intake, exhaust). Then the cooling system (sea- or sweet water) with pumps and filters. The exhaust manifold/risers/elbows.<br /><br />It can be done, ofcourse - it's just not all that simple.<br /><br />The blocks used for marine engines comes from the major engine factories. Not so that any given marine supplier always uses the same brand block and not so that any given block is used by one marine supplier only. So finding one to fit your drive can be a matter of checking more makes - remembering that you want to reuse the accessories.