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Registered:
June 2002
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Hypothetically speaking (NA JZ Engines)
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Fri, 15 July 2005 03:48
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Just pondering away.
If you were to build a 2.5l NA beast (racing class rules say), would you use a 2JZ block to get a better rod ratio (similar to how civic type-R's use the same block as the B18C).
What are your thoughts on Alloy Rods??
Pistons? GT I recall you having a play with the FSE pistons, but the didn't acommodate the valves!?!?!
Are they up to taking 9-10k RPM, ringlands etc...?
What CR would have they given? And would shortening the rod have solved the issue??
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Hypothetically speaking (NA JZ Engines)
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Fri, 15 July 2005 04:02
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2jz's are stroked 1jz's with a bigger block.
If you put 1jz crank and pistons/rod in a 2jz block it would be about 3:1 compression ratio.
At least thats what I understand you are thinking?
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Location:
Brisbane
Registered:
May 2002
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Re: Hypothetically speaking (NA JZ Engines)
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Fri, 15 July 2005 04:07
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I think he's talking about 1JZ crank and pistons with longer (ie custom) rods to fit in the 2JZ block. Longer rods have many benefits in a high-revving engine.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Hypothetically speaking (NA JZ Engines)
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Fri, 15 July 2005 04:10
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Ahhh, I'm with theee.
Except the whole increase in rotating mass thing.
Hence the ali rods I suspect.
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Location:
Melbourne
Registered:
May 2002
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Hypothetically speaking (NA JZ Engines)
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Fri, 15 July 2005 07:01
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There is a 20+ mm difference in deck height so you'll need rods that are that much longer. Lots of extra weight there so you may not see the benefits you were hoping for.
With regard to Al rods, these are really a short term proposition only. They work fatigue very rapidly and are very likely to fail if not replaced. The drag racing boys use them but I believe they are replaced very regularly (I understand after every full power run?? - anyone confirm?).
Leaves you with a $4-6G bill for Ti rods - not pretty.
I was looking at 2JZGE VVTi pistons. Decided to go custom, but now plans are up in the air. Never really confirmed whether there was quite enough clearance for my 11mm lift cams, but I suspect there is enough for the stock 8.3mm lift cams.
I have some decent holidays early next year - I will be tinkering a fair bit and finally building the stupid thing then. Probably doing some other stuff though.
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