105mm Piston - Group buy?

Goose916 · Jan 25, 2016

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.

Goose916 · Jan 25, 2016

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.

bushmechanic · Jan 25, 2016

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

bushmechanic · Jan 25, 2016

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

tourist · Jan 26, 2016

How do you reckon this piston would fare in a 550 motor?

husabutt · Jan 26, 2016

Will the head require any machining to match the increased bore size?

bushmechanic · Jan 26, 2016

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

spanner · Jan 27, 2016

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.

bushmechanic · Jan 27, 2016

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

Goose916 · Jan 27, 2016

bushmechanic said:
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!

Goose916 · Jan 27, 2016

bushmechanic said:
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

I'm all over it on Friday! I'll call them and let you know. Since we are awaiting confirmation from JBS anyway, I'm going to follow Bushy's lead and inquire as to what it would take to build out a custom piston of our own and what it would take "run" wise. In any event, the tally to date is: Goose 4 (maybe 5 if necessary); Bushie 2; Spanner 1 (THAT'S OVER THE HALF WAY MARK ALREADY) Huzzah!

tdetlor · Jan 28, 2016

Id love to slap a 105mm in my 650. I have to look into thoroughly whats involved, but I think id pick one up for the sake of getting the order for the group.

Tim

WArdogG · Feb 4, 2016

I had also looked into the Wiseco pistons for Husaberg, as I saw they now list a piston for the BerG in their 2015 catalogue. The pistons are Build On Demand though, and same as for the 105mm, the minimum amount is 12 pistons.

I would also consider getting a 105mm piston if it will help to fill the order

bushmechanic · Feb 4, 2016

the main information is in here

http://husaberg.org/husaberg/19472-650-700-kit-do-yourself-thread.html

bushmechanic said:
pston diameter should be in the region of 104.67mm let the piston mnfr figure that from the bore diam and compression ratio

big piston valve pocket 3D model in the zip

piston volume -14.1cc, squish = headgasket thickness = 1.2mm

CR approx 12:1

valve pockets are same as 100mm 628 elko piston 39 and 35mm diameter should be just ok for up to 37/32mm valves and stock cam

more models with different valve pockets tomorrow

4567d1421673373-650-700-kit-do-yourself-thread-piston-stock-valve-pockets.jpg

STP file of piston top with stock valve pockets

http://husaberg.org/attachments/hus...rself-thread-104.6mm-piston-stock-pockets.zip

628 rod details http://husaberg.org/attachments/husaberg/4569d1421674463-650-700-kit-do-yourself-thread-628-rod.pdf

STP file of piston top with pockets for 38/33 valves and big cam (kibblewhites)

http://husaberg.org/attachments/hus...6mm-piston-38-33-valves1mm-deeper-pockets.zip

i suggest goose we ask for the one with big valve pockets to cover wider range

specs then are pin center to piston top 24.5mm

lower part of piston can be the same as a prox piston which they have at wiseco

PN# 01.6606.A

A: Diameter: 99.95mm

B: Total height: 41.20mm

C: Pin size: 20.00mm

D: Compression height: 14.50mm

G:Boss Space: 23.00mm

if they need a complete model of the piston lower half i can do it but im very very busy LOL

bushmechanic · Feb 4, 2016

liner outside dimensions in pdf for westwood

will need to spec ID final size at some point based on piston diam at a clearance of 1 thou per inch bore diam

also i recommend adding a groove on the top for a sealing wire ring and grooves on the od of the liner for beytter cooling

ill put these details up later but they are already uploaded in various locations on this site

the basic details required are all there we just need goose to take a big box of beer over to wiseco with some of his big pistons and liners and talk to the berg rider there

spanner · Feb 4, 2016

Bushie, the dish in my piston measures 7cc I think, 13.5:1

if possible I would like the valve pockets only and to finish the dish myself

Goose916 · Feb 4, 2016

I'll place the call tomorrow and let you guys know if I need anything else.

Goose916 · Feb 4, 2016

bushmechanic said:
liner outside dimensions in pdf for westwood

will need to spec ID final size at some point based on piston diam at a clearance of 1 thou per inch bore diam

also i recommend adding a groove on the top for a sealing wire ring and grooves on the od of the liner for beytter cooling

ill put these details up later but they are already uploaded in various locations on this site

the basic details required are all there we just need goose to take a big box of beer over to wiseco with some of his big pistons and liners and talk to the berg rider there

Once this job is done (2 weeks), I'm likely to do just that!

canolman · Feb 5, 2016

Just rebuilt my motor, new Elko and rings, replated liner.....

. Keep me in the loop for a future build, got a spare motor on the bench, 105mm does sound very good:spin:

Goose916 · Feb 5, 2016

Just got off the phone with "Al" a Husaberg guy who looks forward to dealing with us. Price is pretty much the same depending on the attributes we want. The armor coating on the top bumps the price as does the skit coatings. Still, not substantially and I felt his representations about the top coating were sincere (substantially deflects heat from the piston and con-rod and becomes harder in the process) Anyway, since Wiseco used to make pistons for Husaberg, he's confident and JBS, he's confident that ours should be no trouble. I've attached the types of "options" wiseco provides for your review and discussion. Still, 12 piston minimum.

105mm Piston - Group buy?

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