gear ratio on my volvo 280

[emsboats]

can anybody tell me the ratio on my 280 drive I bought it as a replacement to bolt to a 350. The company I got it from says its a 1:61 and they got thr info directly from volvo. I called volvo and they could not even tell me the pitch on my prop because it is listed as ex which at volvo means a nla part this is the number on the top of the drive on the plate 28131398B and the part number on the prop is 8132789 any help thanks

 

[emsboats]

Re: gear ratio on my volvo 280

so whats the math im looking for is it how many times the prop turns to how many times the input shaft makes a full revolution?

 

[emsboats]

Re: gear ratio on my volvo 280

ok my input shaft turned almost 1 and 3/4 times to the prop making 1 full rotation is that like a 1:61:1

 

[captmello]

Re: gear ratio on my volvo 280

1.61:1. Welcome.

 

[captmello]

Re: gear ratio on my volvo 280

Is this a new boat you've bought? What year?