Replacing SB8 with a Beta10

[jneely]

I may be forced to replace my old reliable Yanmar YSB8 on our CD27 with a Betamarine 10. Can anyone tell me what modifications will have to be made in order to fit the new engine in? Also, can anyone give me a ballpark figure as to total installation cost? Thanks for all replies.

[csoule13]

Plenty of folks here have repowered with a Beta, though most of the YS8 models go with the Beta 14. I haven't done the repower, but the general impression I've gotten from other folks is that there are no real surprises. Costs are largely driven by the condition of the stringers currently in your boat and how much of the work you are willing to do yourself. The search function will avail you to a fine evenings reading.

For the Beta 10, I'm sure you are aware of the conditions with which they will actually sell you the engine. https://betamarineusa.com/portfolio/beta-10/

Unless costs were shockingly different, I'd go for the 14 every time. The 8-10 hp engines in our 27s are just underpowered, and the chance to get more oomph for lighter weight and smaller unit size seems like a win-win.

[jneely]

Thanks for your reply.

[fmueller]

I wonder if there is any difference at all mechanically speaking between the Beta 10 and 14. The 10 just skips the last 600 rpms and 3.5 hp with a redline at 3,000 rpm vs 3,600 for the 14.

Frankly, I almost never rev my Beta 14 that high ... usually keep it at or below 2400 and go 4.5 knots, so practically speaking (for me anyway) there would be very little day to day functional penalty with a 10 because the power curve / fuel curve is identical between the two up to 3,000 rpm. Not sure that missing high rev horse power would even be noticed much. But I did not know this in advance. I just went for the 14 because others had for the CD 27.

I thought the Beta 16 would be a tight fit in my 27. It IS a larger motor. The 10/14 block was tight enough.

I'm looking for a current price list and can't find one. It looks like about a 10% premium looking at earlier price lists. That's not much vs total cost if you replace other items. You'll likely have to get a new shaft/seal and prop. Probably exhaust and shifter/throttle too. If you do the install, that is where the big savings comes in, otherwise labor will almost double the hardware cost.

Also while you are looking - consider the Yanmar 2ym15. It comes stock with a 125 amp alternator vs 40 for the small Betas. Yanmar correctly assumes that a main function of these small motors is keeping batteries topped off - ie as much a generator as a motor ... I did not notice this either when I got the Beta 14. Might have gone for the Yanmar - both great motors.

[jneely]

Thanks for the replies.

[jfischgrund]

I replaced my YSM8 with the Yanmar 1GM10 and am quite happy with it. Expect to need different mounts, shaft, etc. I felt more comfortable with Yanmar in terms of service, warranty, parts availability, etc.