Finding drive ratio?

[Wide Open]

Is it possible to determine the drive ratio from the SN? I am looking for a new prop and the Mercury prop selector wants to know the gear ratio. I of course don't have any idea but based on the previous owner I assume it is whatever it came with stock. The boat is up in the sky because I am working on the trailer brakes so I don't want to climb up in there and turn the engine unless I have no other choice. The drive is a 1990 Alpha I SN 0D309970.

 

[wire2]

Re: Finding drive ratio?

What engine? Typically, I believe V8's are 1.5:1 (or 1.47:1), 4's & 6's are 2:1, (1.98)

 

[180shabah]

Re: Finding drive ratio?

What engine? Typically, I believe V8's are 1.5:1 (or 1.47:1), 4's & 6's are 2:1, (1.98)

Don't forget the 1.65 and 1.89's......

 

[Wide Open]

Re: Finding drive ratio?

Sorry didn't realize the engine mattered.
It is a 1990 4.3 (carb). The options according to the Mercury are: 1.47, 1.62, 1.81, and 2.0.

 

[180shabah]

Re: Finding drive ratio?

Engine and elevation, determine which ratio would have been installed.

 

[Coors]

Re: Finding drive ratio?

180 having fun..

 

[wire2]

Re: Finding drive ratio?

Don't forget the 1.65 and 1.89's......

Another successful day; I've learned something. Thanks.

 

[njlarry]

Re: Finding drive ratio?

Have you learned your ratio yet? Have you emailed Merc or is the info on their web?

 

[Wide Open]

Re: Finding drive ratio?

Have you learned your ratio yet? Have you emailed Merc or is the info on their web?

No not yet. I have been working on the brakes and am still having issues so I will get back to the drive ratio once the brakes work. I haven't emailed Merc yet nor have I been able to find anything on their website.