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Kris
 Post subject: Piston information
PostPosted: Sun Sep 18, 2005 8:18 pm 
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Car Model: ST205
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 :D

Thanks to GT4WRC for the ACL info
Thanks to Peterpiper for the JE gasket info

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95 ST205 - slept for 10 years, now waking up...
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Turbocharging - the replacement for displacement


Last edited by Kris on Tue Nov 28, 2006 11:38 pm, edited 5 times in total.

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TrackToyFour
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PostPosted: Mon Sep 19, 2005 12:03 am 
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Location: Perth, Western Australia
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My favourites :D 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 :cry:

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Don
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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
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datajon
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PostPosted: Mon Oct 24, 2005 6:20 pm 
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any info on cosworth pistons.

I have bought a few over the years, they do seem to last.
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two_OH_five
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PostPosted: Mon Oct 24, 2005 6:42 pm 
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As far as I know the JUN pistons are supplied by Cosworth although this could just be urban myth
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Kris
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PostPosted: Mon Oct 24, 2005 7:45 pm 
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I believe JUN = Cosworth = Mahle

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95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
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TrackToyFour
 Post subject:
PostPosted: Mon Oct 24, 2005 10:00 pm 
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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.

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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp
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two_OH_five
 Post subject:
PostPosted: Tue Oct 25, 2005 10:23 am 
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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: :lol:

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
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Kris
 Post subject:
PostPosted: Tue Oct 25, 2005 10:42 am 
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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.

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement
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krude
 Post subject:
PostPosted: Tue Oct 25, 2005 11:01 am 
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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??

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two_OH_five
 Post subject:
PostPosted: Tue Oct 25, 2005 12:12 pm 
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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 :shock:

Hold on to your pocket protectors. This thread contains much nerdery
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TrackToyFour
 Post subject:
PostPosted: Tue Oct 25, 2005 1:59 pm 
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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: :lol:


OK Steve, here is the conclusive proof that Cosworth make JUN pistons http://www.junauto.co.jp/products/cylin ... on-kit/?en

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Don
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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp
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two_OH_five
 Post subject:
PostPosted: Tue Oct 25, 2005 2:10 pm 
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place, me, that's, put, my, in

re-arrange to form a well known expression LOL
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krude
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PostPosted: Tue Oct 25, 2005 2:30 pm 
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Interesting link Don, one set of figures say the bore is 84.0mm, then further down another set say it's 87.0mm

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Kris
 Post subject:
PostPosted: Tue Oct 25, 2005 2:31 pm 
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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! :shock: DOH!

So, if they can't get the diameter of their piston correct, do they know who is supplying them their pistons! :lol:

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement
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Kris
 Post subject:
PostPosted: Sun Oct 30, 2005 10:52 pm 
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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! :)

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
_______________________________________
Turbocharging - the replacement for displacement
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