OMC Cobra HELP. 3.0 to 3.1 L32 change?

[Spookeay]

HI Gang. Well I got a great deal. A 1990 Bayliner with a OMC Cobra and a 3.0 for $100

Everything works best I can tell. I did not buy the boat to use I got it for the stern drive to put on another boat. But I may have a problem.

My question is, Can I put a larger engine on this drive?

I need to have at least 160 HP for the boat I want to put it on.
Can I put the L32 160 HP V6 3.1? on this drive.

Will it take it and will it bolt up?

Any Ideas?

 

[Bondo]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Can I put the L32 160 HP V6 3.1? on this drive.

Ayuh,... Before Any of your other questions can be answered,....

What the 'ell is That.....

 

[Spookeay]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

The L32 is this.

The power rating of the 3.1 L L32 used in the Camaro and Firebird 160 hp@ 4,600 rpm and 200 ft?lbf torque @ 3600 rpm.

Applications:

* 1993-1995 Chevrolet Camaro
* 1993-1995 Pontiac Firebird

 

[Don S]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Where you going to find the marine exhaust manifolds, distributors, alternators, starters, and fuel systems needed to make it marine (aka legal and safe), couplers, exhaust Y's, flywheel covers, etc. etc.

 

[Bondo]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Applications:

* 1993-1995 Chevrolet Camaro
* 1993-1995 Pontiac Firebird

Ayuh,...

Unless it's been used in Boats before,...

It's Not an Option.... Period...

 

[Spookeay]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

OK Thanks, That's all I needed to know.

 

[abj87]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Isn't the L32 the N/A 3.8L which was used by omc. I'm not intirely sure but the 3.1 may be the same motor with less displacement.

 

[HT32BSX115]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

"new""

HI Gang. Well I got a great deal. A 1990 Bayliner with a OMC Cobra and a 3.0 for $100

We all know boaters are cheap! That why we come here to save a buck......A boater that's a Ham is EVEN CHEAPER!


$100 deals work great for old Hallicrafters, Collins & Drake stuff..........but not so good on boats powered by OMC....(I'm donning my fireproof suit now!!)


If you're going to replace your engine you just can't put any car engine in it...I believe there are a lot of I-4's & V-6's that won't bolt to that flywheel cover, If it's an automotive camshaft, you'll have problems with reversion (sucking water back up into the exhaust etc....) I could be wrong, but there's no automotive 3.0L engines out there...... also...I don't think it's ever been put in a car or truck.....

You'll have to use the marine carb, ignition and other stuff bolted to your current block or find suitable marine replacements...

I had an OMC Cobra in my current boat. I "replaced" it a different way...


If you just LOVE that boat, and cannot part with it, find another boat with a Mercruiser (or Volvo Penta) engine and drive and pull it out and replace your OMC stuff with the "new" stuff...


73/Rick

 

[chiefalen]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Miss, you want the drive for the other boat, did it have a cobra on it already?

And the other boat what motor did it have in it?

Make and model please.

 

[Don S]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

HI Gang. Well I got a great deal. A 1990 Bayliner with a OMC Cobra and a 3.0

Chief, Did you miss this?

 

[a70eliminator]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Ummm I think She bought it just for the drive.

Everything works best I can tell. I did not buy the boat to use I got it for the stern drive to put on another boat. But I may have a problem.

 

[Spookeay]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

OK Guy's

It was just a question! I have not had a chance to part the boat out or warehouse it yet. So I have not made the bell housing measurements. I just wanted to know if the out drive could take the horsepower increase. The business I own has a in-house machine shop so making manifolds and risers was not the issue. All the engine control management and such were not the question.. I just wanted to know if it could handle the HP increase.

Sorry for the confusion..

Take care?
Heather.

 

[Howard Sterndrive]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

I just wanted to know if it could handle the HP increase.

actually the question was: Can I put a larger engine on this drive?

and all the reasons above are why the answer is generally no, however,;

The small propshaft (13 spline) 3.0 Cobra drives were good to 140HP.
The 1990 and later 15 spline 3.0 mated Cobras were thoretically good to 260HP.

modern Car engines dont make their rated HP until around 5500 rpm, so an automotive 3.1 turning 4400 rpm in a boat would proabably make about 120HP.... so you would probably be going down in HP.

And with the 3.0 gear ratio, you will have a top speed of about 36 mph due to the gear ratio and availability of practical propellers no matter what HP you use. You would have to change gears in the drive to be able to use more HP.

btw, I've never seen a machine shop with a foundry in it. Marine exhaust manifolds are generally made of cast iron.
With about 50 to 60 hours of custom stainless tubing welding and bending a skilled craftsperson could make a set... 99% of machine shops would not have the equipment.
There is a place that makes manifolds for the modern 3800 GM V6, but they are about $2500

 

[chiefalen]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

OK, that out drive will handle up to 160 hp no problem.

The L6 was not made in 90' was never mated up to a cobra.

You never mentioned the other boat i asked you about. Size, and what motor and drive it had in it.

A 3.0 cobra will not handle a v6. You'll eat the gears with a large motor.

Don't get me wrong on this one cause i generally believe what people tell me.

Till proven wrong.

So what kind of machine shop you have?

You make manifolds also?

Risers also?

Interesting.

Have a pic of the joint?

Do you carry old omc parts?

If yes you on the net?

Maybe i can buy something when i need it.

 

[Spookeay]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Gezzz.

I asked a general question and I am attacked.
Or that is how it looks?

I only asked 3 questions:
Q. Can I put a Larger Engine on this drive?
Q. Can I put a L32 On it?
Q. Will the bolt pattern work?

What did I say to get every one on my case?

BTW, Yes we can make manifolds and risers and pretty much any thing we need. We have A CNC shop and this was not part of my question.

MY GOD! This has been so rude!

Do I look like a wounded elk?

To answer your questions:

- The boat it is going in is a 1969 Bourm Sea Camper House Boat.
- It came with a Merc 150,HP inline 6
- The machine shop is part of my import automotive business . We maintain Porsche, Lexus, Mercedes, JAG and BMW. We also do Performance upgrades on all the above autos.

Here is a link if you want to confirm it:

http://yp.yahoo.com/ypResults.py?st...=35072&msa=0000&slt=33.0871&sln=-86.0717&cs=5

Watch this video:

http://www.youtube.com/watch?v=PBl0V2FaZj0

and you will see I am in uniform in parts of it with my name and my company's name on my shirt matching what I linked to above.

Yes. I get my nails dirty!!!!!! I work in the shop too. Ain't it sad a girl works on engines and knows a milling machine from a lathe, a plasma cutter from an oxyacetylene torch, and a impact from a OBDII/CAN scanner!

Also What U-Joint do you need a photo of? There are 2 on the out drive - both are U Joints in a collar.

Yes, I have some OMC parts. I am just getting into the Marine Salvage business and was looking for some help because in technical issues I am still learning about marine mechanics. I did not expect to get the 5th degree on a innocent and very basic question?

Should I build a cross?
And do you need a spear?

 

[chiefalen]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Ok i don't give a rats behind about you ego. I have known and admire a few female mechs.

Here the real dope.

Rebuild that L6. When you have it out of the boat ether rebuild the drive or go with a newer model like a gen 1 or gen 2.

My inexpert opinion, go with a gen 2.

Check the transom good for rot.

That L6 is one of the best motors ever designed. And is a marine motor.

If you chose to go with a gen 1 i have everything but the drive.

Meaning the inside transom bracket, bellhousing, and everything on the outside of the transom, but the drive. I have the gears but notshell of the upper or lower drive.

Good luck maim.

If you need more help just post.
.

 

[Bondo]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

MY GOD! This has been so rude!

Ayuh,....

I have No doubts about your abilities,...
Don't make up your mind about iboats based on 1 poster's comments...

Yes, I have some OMC parts. I am just getting into the Marine Salvage business and was looking for some help because in technical issues I am still learning about marine mechanics.

Based on that,....
Let me warn you,... OMC has been Out of Business for over 10 Years now,...
Some Parts are NLA,.. The Knowledge about them is also dying...
If you're looking to repower something,...
Go with Mercruiser, or Volvo....

OMCs are Great for junking out,+ Reselling the scrap parts, as there is No factory support left,+ the poor suckers that own them, Still need Parts...

And,...
The last thing about transplanting Marine drives is,...
Make sure your Gear Ratios are correct,... Otherwise,.. It'll be Impossible to Prop it Right....

Watch this video:

http://www.youtube.com/watch?v=PBl0V2FaZj0

I watched your Video,... Very Cool...

When watching the hull on plane,.... It seems to have Too much wetted surface...
It appears that you should be running more positive Trim, or possbly you have a Hook in the hull...

Btw,.....
That looks like 1 Painful boat picture,....

 

[HT32BSX115]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

ell,

I didn't think I was all that rude......
I love the art! I can see why you might want to keep the boat...

What Bondo is suggesting is exactly what I did with my boat...

You might also install something like this in it....
It covers all your favorite "low band" freqs

Regards,

Rick



EDIT,


Ok,

I watched the video.. (cool video btw)

That's an outboard. You want to replace the transom and put a stern drive in it?

That of course is "do-able" A lot of work IMHO that may not be worth it and would change drastically the way the boat handles (because it would change the CG) AND reduce dramatically the amount of room you have in the back.......

Nice restoration job too! I would bolt a new 225 Evinrude ETEC on the back and call it good! very light engine compared to a big heavy stern drive....

//SK

 

[Gary H NC]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

Nice restore...loved the video!

I agree with Bondo,don't let one persons posts get to you Heather...

As far as the repower a good donor boat with a Merc setup would be ideal.
A 4.3 with the Vortec heads would be great in that boat.It would put you in the 200 HP range.

 

[chiefalen]

Re: OMC Cobra HELP. 3.0 to 3.1 L32 change?

I'm confused, if it has a outboard, than it has to stay a out board.

If it is a merc. i/o than it makes no sense to go to a omc.

If it has a L6 in it, would be tough to go to a 4.3.

Can be done. If there is room in the engine bay.

The 4.3 will have to be a merc. volvo, or omc but the drive gears will have to match the hp of the motor.

This boat i don't believe is a speed boat if it had a L6.

Tell you what if with enough money you could drop in 2 -7.4's with 2 bravo 3's.

But after 3 minutes at wot the boat will shake apart, and all you will see on the water is the transom and the out drives and motors like wiley cayote.
Going crazy fast and she will be yelling how i stop this thing. Hanging off the steering wheel hair blowin in the wind legs straight out in back.

Now i'd pay to see that.

Ha.