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Old 05 April 2015, 11:56   #11
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Country: UK - England
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Bl@@dy he!!

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Old 05 April 2015, 14:34   #12
Country: UK - England
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I'd be looking at stock Toyota pistons & get them machined to the specs of the Yam ones, especially if lower compression. Stock pistons are cheap for the cruiser engines from Milners 4x4.

Engine Piston Set (6) Std (no Rings) for Toyota Uk Land Cruiser HDJ80 - 4.2TD 1990-1998 UK/IMPORT

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Old 06 April 2015, 03:19   #13
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Give it a couple of hours of running
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Old 06 April 2015, 03:48   #14
Country: UK - Scotland
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Yamaha engine bits

I rebuilt an ME370 a few years ago and sourced the pistons via Kilmarnock Engine services, they reground the crank, cut the valve seats, skimmed the head, etc for me. They got them from A truck part supplier in Germany.
Different engine, but maybe worth a call?
Cheers Barry
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All I ask is a tall ship and a star to steer her by
the wheels kick and the winds song and the white sails shaking
a grey mist on the seas face and grey dawn breaking
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Old 01 September 2015, 14:00   #15
Country: Ireland
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Would it be possible to use a good 1hd ft engine block and use my original yamaha pistons with new rings .the bores are rusty on my old engine I was told .its a 432 sti 285hp version .yam man might be able to point me in the right direction .
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Old 01 September 2015, 17:08   #16
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Town: Sydney
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Length: 8m +
Engine: Yamaha ME 421STI x 2
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There are companies in the U.S. that will make pistons for you at a reasonable price. I got some made for my Porsche by JP Pistons about 15 years ago and I have done almost a million kilometres with them. They were a quarter the price than from Porsche and I got a custom compression ratio.

They do a lot of racing vehicles so make top quality stuff.

Probably not the first option, but certainly an option.
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Old 05 September 2015, 04:27   #17
Country: UK - N Ireland
Town: Co. Antrim
Make: Stormforce
Length: 10m +
Engine: Yamaha 420
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Not sure about 432 but all 422's use 1HDT block bore grade 2. Probably is the same since yanmar 6lp 315hp uses this block also. PM me for technical detail and sensible part source
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Old 09 September 2015, 07:11   #18
Country: Netherlands
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wiseco can make any piston yoy want. Google them
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Old 13 September 2015, 02:32   #19
Country: UK - N Ireland
Town: Co. Antrim
Make: Stormforce
Length: 10m +
Engine: Yamaha 420
Join Date: Apr 2015
Posts: 13
Yamaha pistons

Beware after market land cruiser Pistons. Some out there are not up to the higher cylinder temperatures.
Sure the combustion chambers can be CNC machined to lower CR but gudgeon pins are not as strong which would be the weak link in a 432 unit. Art Pistons used by Yam are nothing special in construction and accept a Toyota top ring but 2nd ring is thinner as is oil control. We regroove to accept an OE ring set, complex!!
Building one of these is more complex than your normal diesel with loads of very important tolerances and in particular a block change means a calculation for head gasket thickness.

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