www.gt4dc.co.uk :: View topic - Piston information

The source of JUN = Cosworth was a thread on the Skyline GT-R forum. There was quite a lot of detail so it seemed credible.

I have never seen anything which says Cosworth make Mahle pistons although if you have evidence to the contrary then I will stand corrected. Mahle are OEM suppliers and I see no reason for them to use an external supplier. Mahle supplied many of the F1 pistons in the turbo era as well as for the TTE run GT-Fours and most recently the dominant Audi R8 Le Mans sports prototype

I too find this hard to believe

TrackToyFour wrote:

The source of JUN = Cosworth was a thread on the Skyline GT-R forum. There was quite a lot of detail so it seemed credible.

Quote:

:This post is useless without links or the "archived" thread: :lol:

Author:	Kris [ Sun Sep 18, 2005 8:18 pm ]
Post subject:	Piston information
Some info I have accumulated regarding pistons Wiseco Part No - K552M865 86.5mm CR - 8.2-8.6 (what!?!) Gasket - 1.42mm Weight - 339g Accralite Part No - 1176co8632 86.32mm CR - 8.3 (unverified) Gasket - unknown Weight - unknown Part No - 1158xc8596 86.05mm CR - unknown Gasket - unknown Weight - 363.7g JUN Part No - 1001M-T003 87.0mm CR - 8.3 Gasket - 1.2mm Weight - 355g Ross Part No - 99823 86.5mm CR - 8.5 (allegedly) Gasket - unknown Weight - 370g Arias Part No - 3710100 86.0mm CR - 8.5 Gasket - 1.4mm Weight - 360g Part No - 3710101 87.0mm CR - 8.5 Gasket - unknown Weight - unknown HKS Part No - 2103-RT029 86.0mm CR - 8.7 Gasket - 1.2mm Weight - unknown JE Part No - Was 162109 now 252061 86.5mm CR - 9.0 Gasket - 1.4mm Weight - 343g Requires Piston Ring Part No - JG1004-3405. Ring widths - 1.0x1.2x2.8 Part No - 223126 86.0mm CR - 8.5 Gasket - unknown Weight - unknown Part No - 223127 87.0mm CR - 8.5 Gasket - unknown Weight - unknown Part No - 223125 86.5mm CR - 8.5 Gasket - unknown Weight - unknown CP Part No - SC7450 86.5mm CR - 8.6 * Gasket - 1.0mm * Weight - 323g * - CP list the piston as a 9.0:1 CR. CP have verified that using a 1.0mm gasket an 8.6:1 CR will be obtained. ACL Part No - 4MKRY9630 - 0.50 86.5mm Gasket - unknown Weight - unknown High Silicone Aluminium Alloy Double heat treated (T5 + T6) Available through www.acl.com.au Mahle Part No - TOY378405I04 86.5mm C/R 9.0 Gasket - unknown Weight - 323g High Silicone 4032 Aluminium Alloy Grafel anti-friction treated piston skirts Phosphate lubricated pin and ring lands If you have any more information regarding pistons then please let me know and I will update this list Thanks to GT4WRC for the ACL info Thanks to Peterpiper for the JE gasket info

Author:	TrackToyFour [ Mon Sep 19, 2005 12:03 am ]
Post subject:
My favourites http://www.horsepowerfreaks.com/perform ... ne/Pistons BTW they do make custom pistons (e.g. 86.0mm) but not yet available for the 3S-GTE

Author:	datajon [ Mon Oct 24, 2005 6:20 pm ]
Post subject:
any info on cosworth pistons. I have bought a few over the years, they do seem to last.

Author:	two_OH_five [ Mon Oct 24, 2005 6:42 pm ]
Post subject:
As far as I know the JUN pistons are supplied by Cosworth although this could just be urban myth

Author:	Kris [ Mon Oct 24, 2005 7:45 pm ]
Post subject:
I believe JUN = Cosworth = Mahle

www.gt4dc.co.uk http://www.gt4dc.co.uk/forum/

Piston information http://www.gt4dc.co.uk/forum/viewtopic.php?f=13&t=50	Page 1 of 3

Author:	TrackToyFour [ Mon Oct 24, 2005 10:00 pm ]
Post subject:
The source of JUN = Cosworth was a thread on the Skyline GT-R forum. There was quite a lot of detail so it seemed credible. I have never seen anything which says Cosworth make Mahle pistons although if you have evidence to the contrary then I will stand corrected. Mahle are OEM suppliers and I see no reason for them to use an external supplier. Mahle supplied many of the F1 pistons in the turbo era as well as for the TTE run GT-Fours and most recently the dominant Audi R8 Le Mans sports prototype.

Author:	two_OH_five [ Tue Oct 25, 2005 10:23 am ]
Post subject:
TrackToyFour wrote: The source of JUN = Cosworth was a thread on the Skyline GT-R forum. There was quite a lot of detail so it seemed credible. :This post is useless without links or the "archived" thread: Quote: I have never seen anything which says Cosworth make Mahle pistons although if you have evidence to the contrary then I will stand corrected. Mahle are OEM suppliers and I see no reason for them to use an external supplier. Mahle supplied many of the F1 pistons in the turbo era as well as for the TTE run GT-Fours and most recently the dominant Audi R8 Le Mans sports prototype I too find this hard to believe. Mahle are one of the biggest "OEM" piston suppliers covering most things from motorbikes to dump trucks! Unless they have some sort of range sharing agreement with others to fill in blanks in their product range Waiting to be corrected now LOL

Author:	Kris [ Tue Oct 25, 2005 10:42 am ]
Post subject:
Quote: I too find this hard to believe eek! Have I made a boo boo? I wish I could find the info I had on pistons that I "remember" to say that these were pretty much one and the same...maybe the grey matter has failed me! Anyhow, the above info on pistons has been updated with fresh info i.e. adding ACL data.

Author:	krude [ Tue Oct 25, 2005 11:01 am ]
Post subject:
Miguel told me that TODA do pistons for our car’s, have been looking around but can’t seem to find anything to back that up, can anyone here throw any light on this??

Author:	two_OH_five [ Tue Oct 25, 2005 12:12 pm ]
Post subject:
BTW, I forget whether it's the Ross or JE but There was a huuuuge thread over on mr2oc about them. Apparently whichever it is assumes a 1.4mm HG to get the claimed 9:1 CR in an MR2 (possibly Gen II). Use of a stock HG results in a CR of >9.5:1 Hold on to your pocket protectors. This thread contains much nerdery

Author:	TrackToyFour [ Tue Oct 25, 2005 1:59 pm ]
Post subject:
two_OH_five wrote: TrackToyFour wrote: The source of JUN = Cosworth was a thread on the Skyline GT-R forum. There was quite a lot of detail so it seemed credible. Quote: :This post is useless without links or the "archived" thread: OK Steve, here is the conclusive proof that Cosworth make JUN pistons http://www.junauto.co.jp/products/cylin ... on-kit/?en

Author:	two_OH_five [ Tue Oct 25, 2005 2:10 pm ]
Post subject:
place, me, that's, put, my, in re-arrange to form a well known expression LOL

Author:	krude [ Tue Oct 25, 2005 2:30 pm ]
Post subject:
Interesting link Don, one set of figures say the bore is 84.0mm, then further down another set say it's 87.0mm

Author:	Kris [ Tue Oct 25, 2005 2:31 pm ]
Post subject:
Well, that clears that up! Just opens up another can of worms as they quote the piston they make for the 3SGTE to be 84.0mm! DOH! So, if they can't get the diameter of their piston correct, do they know who is supplying them their pistons!

Page 1 of 3	All times are UTC + 1 hour
Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/

Author:	Kris [ Sun Oct 30, 2005 10:52 pm ]
Post subject:
Regarding the "Cosworth - Mahle - JUN" Statement I made... A knowledgeable guy called Malcolm dropped me a line 1. Cosworth design JUN pistons. 2. Cosworth, only design the pistons, they don't actually make them. 3. Mahle have the tooling under licence from Cosworth to make the pistons known as Cosworth pistons, and it is actually Mahle who manufacture the JUN pistons with Cosworth stamping. 4. You cannot buy JUN pistons straight off Mahle without the brand-tax, this is not possible due to a tooling agreement. Thanks emicen!