Bristol 34 engine and prop shaft and prop - SailNet Community
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post #1 of 7 Old 10-23-2018 Thread Starter
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Bristol 34 engine and prop shaft and prop

Hi all Iím the new owner of a 1971 Bristol 34 and I am so excited to get her back in the water, but.... it has some things that I have to figure out first and number one is the power plant. I know it came with an Universal atomic 4 but the engine and prop shaft and prop are gone and I have to figure out what I need to replace them. Iím going to go with a yanmar engine because of there availability and Iím a deisel mechanic and they are easy engines to fix. I have a kanzaki 2.62:1 trans that I may use if itís good enough. The guy I bought the boat off of threw in a 2 cylinder yanmar deisel that needs some tlc but it may be too small. Any help in this area would be of massive importance. Thanks
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post #2 of 7 Old 10-23-2018
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Re: Bristol 34 engine and prop shaft and prop

If it were my boat I would look at upgrading from the Atomic 4 with a Beta Marine Beta25. Beta markets their engines as Atomic 4 upgrades, and has done much of the homework for you. Betas are also based on a Kubota block, and Beta Marine readily provides cross-references for parts. Hint: Diesel Tractor parts are much cheaper than Marine Diesel parts.
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post #3 of 7 Old 10-23-2018
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Re: Bristol 34 engine and prop shaft and prop

You are going to want at least 20 HP, 30 would be best. so that means 3 cylinder Yanmar. it is a lot of expense and work to re power so it is worth going to the 30 hp models/ 3Gm, 3Qm and 3Ym models would be what you want Ym being the latest. if I was going to re power that boat I would look for a 3YM30. you will pay a little more but well worth the improvements they have over the older models. pay a little now or pay for it latter when parts get harder to find for the older models. many of the older models are raw water cooled, are you in fresh or salt water? whats your budget for the engine

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Re: Bristol 34 engine and prop shaft and prop

Beta 25 voter here
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post #5 of 7 Old 1 Week Ago
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Go Beta, repowered my 1977 Bristol 29.9 two years ago with a Beta, like was said above parts are more affordable via the tractor side, same part #s unlike Yanmar.

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Re: Bristol 34 engine and prop shaft and prop

Quote:
Originally Posted by Pegu club View Post
Go Beta, repowered my 1977 Bristol 29.9 two years ago with a Beta, like was said above parts are more affordable via the tractor side, same part #s unlike Yanmar.
No need to denigrate Yanmar. They have been amongst the gold standard for years with constant development and improvement. Their parts have been easy to find and I have an ancient 3gmf.

I too like the betas. A number of friends have them. After they have been around for a while, maybe the sailboat makers will start using them in new boats and their older engines will be talked about like the older Yanmars.

I would buy what fits best in your boat. What needs the least reworking as far a physical layout, transmission and prop.

That would be the reason for my decision, not some marketing info or any info denigrating a tried and true brand like Yanmar. They both make fine engines. Yanmars has been tested over time.

BTW the thread is more than a few years old, but reviving it for the correct reasons made sense to comment on.


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post #7 of 7 Old 1 Week Ago
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Not denigrating anything, just stating a difference, Yanmar makes a good engine everyone knows that, they just set up parts purchasing so they can get a higher price, to say that is not denigrating when it’s how they do it.

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