150HP Diesel Re-power Questions - SailNet Community
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post #1 of 2 Old 09-12-2010 Thread Starter
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150HP Diesel Re-power Questions

Will be re-powering my ketch in a couple of months with a 135-175HP 6 cylinder natural diesel. Would prefer 150HP or greater. Transmission will be an axial 2:1. Current engine is a dead 165HP Fiat with Velvet drive.

Prefer a new engine but a credible rebuild could work.

Three questions:

1. Will start making the calls to engine peddlers next week. Have Gulf Marine, Trans Atlantic Diesel, Gold Coast, and Northern Equipment on my list. Any other recommendations? Anywhere in the US is OK.

2. The old engine was a hard mount-- bolted steel to steel. The driveshaft it mates to is fixed and cannot be modified. When I go to rubber mounts, the engine will crawl around and stress the shaft. Looked at CentaFlex coupler options but the price is breathtaking -- about $2400. Is there another way to accommodate the movement of the engine -- a short jack shaft with U joints etc -that anyone has seen that will work well?

3. Any engine or transmission recommendations would be helpful as well.



Last edited by kaakre; 09-12-2010 at 05:49 PM. Reason: spelling
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post #2 of 2 Old 09-12-2010
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Beta Marine are just launching a new 150HP diesel that may be of interest or are you looking at rebuilds? Engine mounting brackets and compatibility with your existing configuration will be a big issue, this is something most engine suppliers will not help you with and could be very frustrating if you lack the skills to work out the geometry and build mounts.

Regarding transmissions, I would rebuild your Velvet Drive as they are an 'axial' transmission, even with reduction. Most new transmission will be 'drop center' to allow for the reduction gearing. This means you will probably have to modify your engine beds to raise the engine by the amount of the 'drop center'

(drop center means that the output shaft of the transmission is below the level of the input shaft, this can be greater than a couple of inches)

Last edited by r.furborough; 09-12-2010 at 09:24 PM. Reason: Additional comments on Geometry
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