5.0 omc outdrive on a 5.7 liter motor? Will it work?

[chriscraft254]

I am looking to see if a omc cobra outdrive for a 5.0 liter motor will work on a 5.7 liter motor. What's the ins and outs, what can I expect the difference to be and are they even compatible? Thanks for any info guys.

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Anyone?

 

[Don S]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Hard to say. Assuming it's a dog clutch Cobra, it should bolt up with no problem.
Here is some year/model #/gear ratio information from the Seloc manual.

View attachment Cobra drives.pdf

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Thanks Don, it has bolted up fine. I was told the gearing is 18 compared to 16 teeth if that makes any sense. My mechanic really is not sure if it will work either, we have only tested it on land, not in the water yet. I admittedly do not know anything about gearing and how really the mechanics of the outdrive work. I am in a spot where he told me to try it and see what happens. If it doesn't work, I owe him nothing, if it does work, I owe him some cash. Whats your thoughts? He said he believes the outdrive was from a 88 or 89 model. I'm a carpernter not a mechanic, lol

I will see when I pick it up if I can find the model number on the outdrive. Where would that number be located on the outdrive? Thanks for the help and reference

 

[Don S]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

If it's on the boat, run it and find out. Your probably going to have to change props to get the WOT rpm down if they go over spec.

Might post over in the prop forum of what people get when they re-prop with the wrong gear ratio.

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

If it's on the boat, run it and find out. Your probably going to have to change props to get the WOT rpm down if they go over spec.

Might post over in the prop forum of what people get when they re-prop with the wrong gear ratio.

Thanks, will do. Thats what he thought as well, probably need to reprop. Will keep you posted on what happens. Question is am I trowing a bandaid on and hoping for the best or do you think it will be ok? What are the risks of running different gear ratio. The gear ratio for the 5.0L outdrive is 1.50:1. The 5.7L outdrive was 1.41:1. Man I hope this works

 

[Bondo]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Thanks, will do. Thats what he thought as well, probably need to reprop. Will keep you posted on what happens. Question is am I trowing a bandaid on and hoping for the best or do you think it will be ok? What are the risks of running different gear ratio. The gear ratio for the 5.0L outdrive is 1.50:1. The 5.7L outdrive was 1.41:1. Man I hope this works

Ayuh,.... What pitch prop were ya runnin' with the original drive,..??

Generally speakin', available prop pitches run from 'bout 15" to 'bout 23" pitch....

Whether ya can make the jump in gearin',..
Depends on where ya started in the available range of pitches....

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Ayuh,.... What pitch prop were ya runnin' with the original drive,..??

Generally speakin', available prop pitches run from 'bout 15" to 'bout 23" pitch....

Whether ya can make the jump in gearin',..
Depends on where ya started in the available range of pitches....

Was running a 14 3/8 X15 prop on the 5.7L Outdrive

 

[Bondo]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Was running a 14 3/8 X15 prop on the 5.7L Outdrive

Ayuh,.... If that was the 1.41, 'n yer goin' to the 1.50, ya got Plenty of props to pick from...

Probably a Better match than the original...

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Ayuh,.... If that was the 1.41, 'n yer goin' to the 1.50, ya got Plenty of props to pick from...

Probably a Better match than the original...

Great, guess I should check out the prop forum as Don S said. The prop I have now is an Apollo. Don't remember what was on it originally before repropping for the old outdrive. Thanks for the help guys, I do appreciate it. So basically if I reprop and get the boat to run in the proper rpm, you all think all will be ok?

 

[Bondo]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Great, guess I should check out the prop forum as Don S said. The prop I have now is an Apollo. Don't remember what was on it originally before repropping for the old outdrive. Thanks for the help guys, I do appreciate it. So basically if I reprop and get the boat to run in the proper rpm, you all think all will be ok?

Ayuh,... Sure,.... I Love Happy endin's,....

Throw a prop on it, 'n Try it,....

Ya need some base numbers to work with anyways,...

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

Ayuh,... Sure,.... I Love Happy endin's,....

Haha, me to. I'm pretty stoked guys, thankyou. Haven't been on the water in a while and actually exterior wise, this drive looks way better than my old one. Hopefully the internals are good as well.

 

[talies13]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

I have 5.0 and 5.8 both outdrives are identical. 5.7 should be to .

 

[chriscraft254]

Re: 5.0 omc outdrive on a 5.7 liter motor? Will it work?

I have 5.0 and 5.8 both outdrives are identical. 5.7 should be to .

The gearing is definately different in the 5.0 and the 5.7 according to the chart above they are different. They do look identical from the exterior.