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Old 25 September 2005, 08:24   #1
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New Yamaha 315 hp diesel with hydra drive

Is there anyone that have performance numbers and torque data of the new Yamaha 315 diesel engine that was released at the southampton boat show.

Revenger had a 29 with this inboard, any one know what speeds compared to the Yanmar 315?

The Yamaha engine is allso a 4,2 l Toyota block so i guess that the yamaha is the same high quality as the Yanmar engines, but what about the new hydra drive with duo prop, can this drive handel all the torque this engine produces when drive rough in big waves?

And is this a better drive than the mercruiser drives?

I know allot of people that have problems with blown mercruiser diesel x and allso the much stronger Bravo one XR drive combined with the Yanmar 315 engine.
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Old 25 September 2005, 13:54   #2
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Quote:
Originally Posted by searafting.no
Is there anyone that have performance numbers and torque data of the new Yamaha 315 diesel engine that was released at the southampton boat show.

Revenger had a 29 with this inboard, any one know what speeds compared to the Yanmar 315?

The Yamaha engine is allso a 4,2 l Toyota block so i guess that the yamaha is the same high quality as the Yanmar engines, but what about the new hydra drive with duo prop, can this drive handel all the torque this engine produces when drive rough in big waves?

And is this a better drive than the mercruiser drives?

I know allot of people that have problems with blown mercruiser diesel x and allso the much stronger Bravo one XR drive combined with the Yanmar 315 engine.
I briefly spoke to the Yamaha guy at the SBS stand. He told me the Revenger 29 at the show had the 275hp Yamaha, not the 315hp. It accelerated twice as fast, 6s compared to 12s for the Yanmar engine. Lost 2-3 knots on top speed but that is because the engine had less hp.
Apparently the 315hp engine is brand new but the Twin Rotating Prop Hydradrive has been available outside of Europe for a couple of years but Yamaha had some sort of agreement with Volvo Penta not to offer it within Europe.
I don't know if the Hydradrive is better than a Bravo 1 or Bravo 3. Certainly Yamaha has a veru good reputation for reliability and the Bravo 3 drive has a chequered history.
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Old 25 September 2005, 17:36   #3
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Quote:
Originally Posted by Flavio
Certainly Yamaha has a veru good reputation for reliability and the Bravo 3 drive has a chequered history.
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Old 26 September 2005, 09:28   #4
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...and the Bravo 3 drive has a chequered history....

A 8m BWM RIB is just being fitted with a Yanmar 315HP and one of the new Bravo 3 X legs down at the local boatyard. The B3X legs looks like it has been redesigned quite sigificantly since I (very briefly) considered it - lots of cooling fins and channels on top of the casing - I presume to address some of the heating issues.

It will be interesting to see how it goes with that combination (and whether it lasts )......

Dylan...
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Old 26 September 2005, 13:12   #5
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I know that the new bravo x drives look different on the outside, but they are the same on the inside as the late old style bravo x drives.

A bravo 3 drive has almost non prop slip and therfore i think that this drive will break earlier than a bravo 1 drive that have more prop slip.

And like i said i know people that break bravo one xr drives behind the Yanmar 315 and the xr i s supposed to be much stronger than the x drives.
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Old 27 September 2005, 08:18   #6
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Yamaha and Yanmar use 4.2l Toyota blocks. Yamaha 421 STIP1(265-270hp) and STIP2(240-250hp) are identical except the turbo. Information I have is the 250hp is for use up to 500 hours / year and the 270hp is advised when used less than 200 hours. 300hp for the same block is quite high and I believe it may be related to several reported cracked blocks and piston damage in Yanmar engines.
The "Yamaha Duoprop" has been in service for several years (Asia Oceania Middle east) and is preferred to standard drive for use on lighter boats.
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Old 27 September 2005, 09:24   #7
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Yamaha have put up some photos and specs on their UK website:

http://www.yamaha-motor.co.uk/produc...nts/sbs_05.jsp

Finally a 315hp that will be reliable and have that lovely hydra-drive!! Redbay 8.4m with a Yammy 315 in the back, mmmmmm!! I'll stop dreaming now
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Old 27 September 2005, 09:36   #8
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Quote:
Originally Posted by hamadi
300hp for the same block is quite high and I believe it may be related to several reported cracked blocks and piston damage in Yanmar engines.
To the best of my knowledge, the cracked block problem with Yanmar 300 engines is attributed to the different engine mount used by Yanmar as their marinisation kit and other engine component installation obstructs the engine mount position that Yamaha use. I can't comment on the piston damage though, I've not heard of piston failure on these engines in the UK... (yet?).
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Old 27 September 2005, 12:14   #9
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Piston problem info I got is from AIFO marine dealer who had the problem on his LUHRS (yanmar / shaft) and did a market investigation to find similar problems.
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Old 27 September 2005, 12:22   #10
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Quote:
Originally Posted by hamadi
Yamaha and Yanmar use 4.2l Toyota blocks. Yamaha 421 STIP1(265-270hp) and STIP2(240-250hp) are identical except the turbo. Information I have is the 250hp is for use up to 500 hours / year and the 270hp is advised when used less than 200 hours. 300hp for the same block is quite high and I believe it may be related to several reported cracked blocks and piston damage in Yanmar engines.
The "Yamaha Duoprop" has been in service for several years (Asia Oceania Middle east) and is preferred to standard drive for use on lighter boats.

Surely the engines can take more than that. They would need to in a commercial environment. Our 370 sti (165hp) has done 200hrs leisure use and i'm quite sure it will be used more in the winter
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