Standard diesel for Bristol 29.9? - SailNet Community
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post #1 of 20 Old 03-04-2014 Thread Starter
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Standard diesel for Bristol 29.9?

I'm looking at a Bristol 29.9 this Friday. The ad says it has a Yanmar YB12 single cylinder 10hp engine. The age is the same as the boat, so it must be original.

The Boat US review says these boats were made with an Atomic 4 at first, then a 15hp Yanmar, then a 16hp Universal.

Is it likely that the owner and broker are wrong?

I'll know in a few days, but I'm just curious if anyone can confirm the stock diesel in a 1977 B29.9 (I think it is the 2QM15, but I might be confused with another boat). I can't find a reference for a Yanmar YB12, only a YSM-8 & a YSM-12.

It looks like a decent boat at a good price:

1977 Bristol 29.9 Sail Boat For Sale - www.yachtworld.com

...but a 10hp engine (even a diesel) isn't gonna move it very quickly.

Ken

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Last edited by CarbonSink62; 03-04-2014 at 03:09 PM.
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post #2 of 20 Old 03-04-2014
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Re: Standard diesel for Bristol 29.9?

I think the 29.9 started in 1977. So it should have been the A4, no? Saw an old add for a '77 29.9 that had a Yanmar SB12. Either way by the Yanmar numbers, whatever the YB12 is (maybe the YSB12?), it should have 12hp not 10hp.

http://shop.toadmarinesupply.com/mar...entification++

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post #3 of 20 Old 03-04-2014 Thread Starter
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Re: Standard diesel for Bristol 29.9?

Thanks, Barq.

I found site with the info from the original sales brochure and it also said 'Yanmar 15hp diesel'.

So, in 1977 (according to the site you linked to) that must have been a 2QM15 (raw water cooled).

I guess I'll know soon enough.

Ken

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Re: Standard diesel for Bristol 29.9?

I found my notes from a B29.9 I looked at last year; it had the 2QM15, from the factory, in 1979. So that where I got that idea.

While we're on the subject, how can a 15hp diesel take over for a 30hp Atomic 4?

Do diesel engines deliver their power at a lower rpm?

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post #5 of 20 Old 03-04-2014
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Re: Standard diesel for Bristol 29.9?

Atomic 4 owners rarely get 30 HP out of their engines; more like 10 - 20 HP under normal usage.
The Beta "drop in" A4 replacements come in a range of horsepower ratings from, say 12, 18 & 24HP.

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post #6 of 20 Old 03-04-2014
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Re: Standard diesel for Bristol 29.9?

http://sailboatdata.com/viewrecord.asp?class_id=1095

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post #7 of 20 Old 03-04-2014
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Re: Standard diesel for Bristol 29.9?

Brokers frequently get these details wrong - I'd do some checking. But it does look like the stock engine should be a Yamaha 2QM15.

I'd be rather cautious about a 35 year old, raw water cooled engine. It could easily be on its very last legs.

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Re: Standard diesel for Bristol 29.9?

Pretty boat! (I may be biased).

The original owner of my boat ordered it with an engine upgrade to the Yanmar 2QM20. I've not heard of a B29.9 fitted with a single cyl yanmar but I dont see why not, I imagine that there were options at the time.

But does seem that the 2QM15 was std equipment: Bristol 29.9

I dont think you'll have trouble pushing it with a 10 or 12 hp diesel, with the proper prop. My previous boat (2000lbs lighter) had an 8hp yanmar and did just fine. Having a few extra horses is noticeable but I would not consider it a deal breaker.


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post #9 of 20 Old 03-04-2014
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Re: Standard diesel for Bristol 29.9?

My Cal 28 has a YSM 8 ,thats rated @ 7 Hp and she does well 6 1/2 Mph Burns 1 liter per hour and takes all summer to burn a tank of fuel!...Dale

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post #10 of 20 Old 03-05-2014
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Re: Standard diesel for Bristol 29.9?

It might also be that the broker is using the std HP one can use ALL the time, ie 12HP, and the 15 hp is the 30 min max useage. I'm recalling my 85 2gm18 is 18 all the time, up to 20 intermittent in its rpm useage.

A motor that size will move your boat. but if it gets rough, fast current etc.....you may be slowing down some. My 7K boat does that with a 2blade prop! A 3 would be better.....

Marty

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