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Piston information
http://www.gt4dc.co.uk/forum/viewtopic.php?f=13&t=50		 Page 2 of 3
Author:  TrackToyFour [ Mon Oct 31, 2005 12:52 am ]
Post subject: 
Interesting info Kris (or should I say Malcolm!)

So the question arises:

If you can buy Mahle manufactured Cosworth designed pistons only direct from JUN why are Mahle advertising pistons under the Mahle Motorsports brand in the USA?

Considering these Mahle Motorsport branded pistons are not available to buy (yet) I sense there is still more to this than meets the eye.
Author:  Kris [ Mon Oct 31, 2005 8:45 pm ]
Post subject: 
Don wrote:
Considering these Mahle Motorsport branded pistons are not available to buy (yet) I sense there is still more to this than meets the eye


Cosworth may have designed Jun's pistons but Mahle have their own performance division too. Hence the Mahle Motorsport pistons for sale in the USA. Mahle pistons themselves are likely to be high quality items

Thanks to "you know who" :)
Author:  Diceman [ Sun Oct 22, 2006 10:06 am ]
Post subject: 
Hmmm, with all these stated CR ratios which are worrying does anyone know if the Mahle jobbies are correect or 9.0:1 as all the others have screwed up with??
Author:  TrackToyFour [ Mon Oct 23, 2006 12:56 pm ]
Post subject: 
......buy them and find out, you know you want to ;)
Author:  keithk911 [ Mon Oct 23, 2006 5:35 pm ]
Post subject:  Jun piston
3sgte Jun pistons...mmm pricey

The JUN Super Piston Kit, manufactured by Cosworth in Britain

http://cgi.ebay.co.uk/JUN-FORGED-PISTON ... dZViewItem
Author:  andycaca [ Mon Oct 23, 2006 5:39 pm ]
Post subject: 
84mm bore tho, it says. surely some mistake?
Author:  CEL1CA [ Mon Oct 23, 2006 5:46 pm ]
Post subject: 
Opps non tech on again, but I thought standard size was 86mm ?
Author:  Gary ST165 [ Mon Oct 23, 2006 7:01 pm ]
Post subject: 
Quote:
You are bidding to buy a brand new set of JUN AUTO MECHANIC FORGED PISTON KIT FOR TOYOTA CELICA GT4 ST205 and MR-2 SW20 3S-GTE any year.

Bore diameter is 84.0mm.

Part number 1001M-T003.

You may be entitled for a discount on this product , please contact me for details.


jusk asked the seller to re-measure: 84mm or 86mm to end the confusion.

i also asked about the discount which we may be entitled to?
Author:  andycaca [ Mon Oct 23, 2006 11:05 pm ]
Post subject: 
gary, i suspect the discount may be via buying away from ebay, thereby circumventing fees etc. thats my gut feeling anyway :)
Author:  Gary ST165 [ Tue Oct 24, 2006 12:28 am ]
Post subject: 
ebay seller says:
Quote:
hi there,

thanks for your email.

discounts depends on how many sets you will be buying.

cheers


Quote:
84mm thats what it says on its website: http://www.junauto.co.jp/products/cylin ... ex.html?en

i dont keep these in stock as they are made to order.

cheers
Author:  krude [ Tue Oct 24, 2006 8:08 am ]
Post subject: 
Hummmmm I want a set :twisted:

Specifications of the JUN Pistons

Engine: 3S-GTE
Bore: 87.0
Wgt: 355
Comp. Height: 35
Piston Crown Shape: ∪
Piston Crown Vol: -12.45
Valve Recession: -0.4
Piston Pins Wgt: 103
Piston Pins Diam: 22
Piston Rings Top: 1.5x3.3
Piston Rings 2nd: 1.5x3.7
Piston Rings Oil: 2.8x3.1
Compression Ratio: 8.3:1
Compression Gasket: 1.2

* Piston crown shape marks: [ ∧ ] Convex, [ &cup ] Concaved.
* All compression ratios are the reference values for you.

These look like the correct figures, I'm sure the 84mm is a misprint.
Author:  two_OH_five [ Tue Oct 24, 2006 10:15 am ]
Post subject: 
:(

87mm doesn't sound much better than 84mm
:(
Author:  krude [ Tue Oct 24, 2006 12:22 pm ]
Post subject: 
two_OH_five wrote:
:(

87mm doesn't sound much better than 84mm
:(


87's with molybdenum (Think thats how its spelt) wet liners no good then?? :? :?
Author:  TrackToyFour [ Tue Oct 24, 2006 12:54 pm ]
Post subject: 
AFAIK no one has tried wet liners in a 3S-GTE and I don't even know if thats possible :?:

No one has managed to get dry liners to survive 500+bhp. I suspect there's some sort of differential expansion between the cast block and the spun steel liners which is causing them to fail.
Author:  krude [ Tue Oct 24, 2006 1:08 pm ]
Post subject: 
Couldn’t see why it couldn’t be done don, just a case of getting the block machined away enough to expose the water galleys to the liners once they are pressed in… or am I looking at this too simply again :? :?
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