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January 25th, 2016, 09:07 AM   #1
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105mm Piston - Group buy?

Spoke with Wiseco this morning and the piston they have on file (7943 M10483 5263D - Thanks Bushie) is proprietary to JB Racing.

1. He did say that if we could confirm that JB Racing is no longer interested in the piston, we could order it directly from Wiseco. Anyone in contact with JB Racing that could discuss with them and possibly procure permission to use the design?

2. The minimum order would be 12 Pistons at approximately $130-145 (usd) each. I would order 3 or maybe 4 if we're close. That leaves 8 or 9 for the rest - any interest? Let me know. Obviously, it's a money up front deal and it would take approximately 4 months to complete at Wiseco.

Let me know if anyone is interested. I'm trying to round up enough interest in the next 2 months to make this happen. Of course, the first hurdle with JB Racing would have to be met initially in order to get things rolling.
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January 25th, 2016, 06:52 PM   #2
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I'll email JBS Racing. However, they don't know me from Adam, and appear quite busy with their own motor. Anyone with an "in" to those guys? Even if uninterested in a big piston, I'd appreciate the help. Decided I'll go five, tell me there's interest in 7 more. ��
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January 25th, 2016, 08:47 PM   #3
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my 105mm piston has approx 350hrs on it.

it did crack but i was being rediculous with rpm, i suggest a limit of 8500.

the squish is quite large and the cr a bit low however i think ben is right in saying that a softer combustion explosion helps things last

by comparison my 100mm build with tighter squish and higher cr etc was toast at 100hrs, piston liner and big end all at roughly the same time



so ill take 2

and Ill email ben today

cheers Goose
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January 25th, 2016, 09:01 PM   #4
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in the meantime goose to perhaps unproprietise the design can you ask how much it would be for a piston with the same specs but 0.2mm taller and 0.2mm smaller in diameter?

would result in slightly tighter squish and a nicer end gap for the wiseco ringset

if they need more absolute value details rather than just suggested changes I have most of them
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January 26th, 2016, 08:39 AM   #5
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How do you reckon this piston would fare in a 550 motor?
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January 26th, 2016, 09:37 AM   #6
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Will the head require any machining to match the increased bore size?
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January 26th, 2016, 01:51 PM   #7
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It's too tall for the 550 tourist. A 105mm piston in a 550 would be interesting but need bigger valves really. Like the project spanner is working on

Bigger valves are good for a"650" with this piston but not essential.

I run 36 kibblewhites intakes and 32mm Subaru ferrea exhausts

Bigger valves move the power up in the rpm which might be good for measuring cocks but the engine wil last longer with less revs. It's stupid fast anyway lol
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January 27th, 2016, 02:23 AM   #8
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Not sure Tourist of the compression height difference between 650 and 550? but some material could be taken from the top of the piston, or a suitably shorter rod used, or thicker head gasket to some extent governed by cam chain length.
38mm inlets will fit the head with larger seats.
You would need a 105mm liner for the 550 which would be shorter than the 650`s.

husabutt, no head machining is required.

Put me down for one of those pistons Goose thanks.
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January 27th, 2016, 04:26 AM   #9
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Bens just let me know they will be restocking soon but ill see what time frame hes looking at.

really goose there is absolutely no reason we cant organize a slightly different piston of our own, i have already drawn 3d models of the valve pockets etc,

can you please find out the cost of a run of 12 similar pistons if we provide all dimensional details
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January 27th, 2016, 10:02 AM   #10
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Originally Posted by bushmechanic View Post
in the meantime goose to perhaps unproprietise the design can you ask how much it would be for a piston with the same specs but 0.2mm taller and 0.2mm smaller in diameter?

would result in slightly tighter squish and a nicer end gap for the wiseco ringset

if they need more absolute value details rather than just suggested changes I have most of them
There's a Husaberg rider at Wiseco! So, yes, more details the better!
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