Technical question about OMC sterndrive

[trionic]

I've a buy a second hand 1990 Four Winns Horizon 180 with an OMC engine.<br />On the engine, it's written Cobra 4,3L<br />With the number written on the block, I see that this is not an 4,3L but well a GM 3,8L. I've some question about this engine:<br />What is the horsepower of this engine?<br />Is it a big difference with the 4,3L? Need I change the gear ratio?<br />What is the setting of the timing point?<br />Has someone some experience with this engine (consumtion, couple, ...)<br />Has some one the wiring diagram of this engine?<br />Thanks in advance for your help !

 

[boatgrunt]

Re: Technical question about OMC sterndrive

Are you sure it's a 3.8? If the engine serial number/tag says it's a 4.3, I would be suprised to learn that it is actually a 3.8. GM did make Cobra 4.3's in 90. Either way, sounds like you need an OMC manual. Email Bob Johnson at viking7@cox.net. He is way cheaper than most ebay postings, and I just bought and returned a 1990 OMC shop manual. Good luck.

 

[Boatin Bob]

Re: Technical question about OMC sterndrive

OMC stopped using the 3.8 with the stringer drives around 1985-86 and only used the 4.3 beyond that. I suppose it's possible someone may have repowered the boat using a 3.8? See if you can find an OMC plate on a rocker cover or T-stat housing with an OMC model #.

 

[whywhyzed]

Re: Technical question about OMC sterndrive

3.8- 2 barrel: 170 HP<br />3.8- 4 barrel: 185 HP<br />4.3- 2 barrel: 190 HP<br />4.3- 4 barrel: 205 HP

 

[DHPMARINE]

Re: Technical question about OMC sterndrive

Could be a moot point either way.Bombardier is not supporting either type of sterndrive.Some parts are available, many are not.<br /><br />DHP

 

[KaGee]

Re: Technical question about OMC sterndrive

Hystat and myself still have 3.8's. Boatin Bob is right... there were no 3.8's in '90. GM replaced the 3.8 with the 4.3 mid '85.

 

[trionic]

Re: Technical question about OMC sterndrive

Many thanks for yours answers.<br /><br />I think the previous owner has change only the engine... I think it comes from a car because it isn't paint.<br /><br />There is no OMC plate.<br /><br />I hope it will enough powerful to make waterski.

 

[cobra 3.0]

Re: Technical question about OMC sterndrive

Makes sure the electrical(starter, alternator, ignition system) is MARINE and not regular auto parts or you can go KABOOM!