Je pistons - Page 4

Nathan · 19th January 2004, 11:09 AM

87mm.

Martin F · 20th January 2004, 11:13 PM

This table is still a bit rough and empty, but thought i'd post up for more input.

Piston & Conrod Specs

If any of you have more info to fill in the gaps could you send it over or add to thread.

Chris Wilson · 20th January 2004, 11:24 PM

What's the "Volume" column supposed to ndicate Martin?

Martin F · 20th January 2004, 11:28 PM

Total engine capacity. Some of these seem to change from the stock 2997cc, i guess due to piston diameter (cylinder overbore) and crown shape.

Nathan · 21st January 2004, 12:09 PM

The TODA piston isn't actually for the JZA, it's for the SW20, which is why it has a very low compression in the JZA- summat like 7:1. I only posted the info because they COULD be used, but they will never give you 8.5:1. TODA do not make a specific JZA piston AFAIK.

....bollox......scrap all that. My measurements were based on using the stroker crank (90mm) so the TODA MR2 pistons hanging off stock internals will be even lower compression....a 5.5:1 2JZ engine anyone? 4 bar boost...?

Martin F · 21st January 2004, 12:12 PM

Hmmmmm info came from here

http://www.todaracing.com/products/t...iston_kit.html

Apart from the weight which you provided. Are you saying that it wasn't the 2JZ piston ?

Nathan · 21st January 2004, 01:04 PM

Nuts. You're right. The thing that has thrown all this out is that we have been trying to find a decent piston that gives the compression we want on a stroked crank. the weight I gave you WAS from an MR2 piston yes (from TODA's 2.2 MR2 kit). In the end we have gone for an HKS piston with a shortened rod and 2mm gasket. I honestly didn't know that TODA made 2JZ pistons- in the past we have only ever used HKS ones if building on stock dimensions. The good thing is that the HKS pistons with a 2mm gasket will give 8:1 CR. Just about the right drop for a nice amount of boost without going silly. TODA list theirs as 8.6:1 like you say but we don't know with what gasket do we?

Sorry for the conf

Martin F · 21st January 2004, 01:38 PM

Quote:

Originally Posted by [b

Quote[/b] (Nathan @ Jan. 21 2004,13:04)]TODA list theirs as 8.6:1 like you say but we don't know with what gasket do we?

Where the supplier has quoted a compression ratio, i've assumed this is with a stock gasket. Do you reckon thats a bit sweeping ?

Nathan · 21st January 2004, 04:02 PM

Hmm....dunno.... Most people would use a thincker gasket anyway so it would be nice to know what the TODAs would give with a 2mm gasket. I'm not sure what the stock thickness is..I've got one here somewhere I think....

Syed Shah · 21st January 2004, 04:59 PM

1.6mm IIRC.

19th January 2004, 11:09 AM	#31
Nathan Senior Member None - Don't currently own a MKIV Supra. Join Date: Sep 2003 Location: Essex Posts: 605	87mm. __________________ Nathan TDI PLC We like VVT-i's, especially ECU solutions :-)

20th January 2004, 11:13 PM	#32
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	This table is still a bit rough and empty, but thought i'd post up for more input. Piston & Conrod Specs If any of you have more info to fill in the gaps could you send it over or add to thread. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

20th January 2004, 11:28 PM	#34
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Total engine capacity. Some of these seem to change from the stock 2997cc, i guess due to piston diameter (cylinder overbore) and crown shape. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

21st January 2004, 12:09 PM	#35
Nathan Senior Member None - Don't currently own a MKIV Supra. Join Date: Sep 2003 Location: Essex Posts: 605	The TODA piston isn't actually for the JZA, it's for the SW20, which is why it has a very low compression in the JZA- summat like 7:1. I only posted the info because they COULD be used, but they will never give you 8.5:1. TODA do not make a specific JZA piston AFAIK. ....bollox......scrap all that. My measurements were based on using the stroker crank (90mm) so the TODA MR2 pistons hanging off stock internals will be even lower compression....a 5.5:1 2JZ engine anyone? 4 bar boost...? __________________ Nathan TDI PLC We like VVT-i's, especially ECU solutions :-)

21st January 2004, 12:12 PM	#36
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Hmmmmm info came from here http://www.todaracing.com/products/t...iston_kit.html Apart from the weight which you provided. Are you saying that it wasn't the 2JZ piston ? __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

20th January 2004, 11:24 PM	#33
Chris Wilson Non-Approved Trader Join Date: Sep 2003 Location: Shropshire Posts: 247	What's the "Volume" column supposed to ndicate Martin?

21st January 2004, 01:04 PM	#37
Nathan Senior Member None - Don't currently own a MKIV Supra. Join Date: Sep 2003 Location: Essex Posts: 605	Nuts. You're right. The thing that has thrown all this out is that we have been trying to find a decent piston that gives the compression we want on a stroked crank. the weight I gave you WAS from an MR2 piston yes (from TODA's 2.2 MR2 kit). In the end we have gone for an HKS piston with a shortened rod and 2mm gasket. I honestly didn't know that TODA made 2JZ pistons- in the past we have only ever used HKS ones if building on stock dimensions. The good thing is that the HKS pistons with a 2mm gasket will give 8:1 CR. Just about the right drop for a nice amount of boost without going silly. TODA list theirs as 8.6:1 like you say but we don't know with what gasket do we? Sorry for the conf __________________ Nathan TDI PLC We like VVT-i's, especially ECU solutions :-)

21st January 2004, 04:02 PM	#39
Nathan Senior Member None - Don't currently own a MKIV Supra. Join Date: Sep 2003 Location: Essex Posts: 605	Hmm....dunno.... Most people would use a thincker gasket anyway so it would be nice to know what the TODAs would give with a 2mm gasket. I'm not sure what the stock thickness is..I've got one here somewhere I think.... __________________ Nathan TDI PLC We like VVT-i's, especially ECU solutions :-)

21st January 2004, 04:59 PM	#40
Syed Shah Member Join Date: Sep 2003 Location: Milton Keynes Posts: 192	1.6mm IIRC. __________________ UK 6sp BPU J-spec NA R6 rip Soarer TT

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