Toymods Car Club Inc: Tech & Conversions => 7MGE bore spacing and overbore limit

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gianttomato
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Re: 7MGE bore spacing and overbore limit	Wed, 13 August 2003 14:14

I'll defer the 7M bore spacing to Ed, but the 2JZ is approx 94mm from memory....I can confirm this over the weekend. I probably wouldn't go nuts overboring 7Ms - you might just be tempting fate! I'd be using the best head clamping technology known to man! Another thing to consider is the compression height of the 2JZGE pistons vs. the 7M pistons. The 7M is 32.5 and the 2JZ is 34mm. Not sure where the piston crown for the 7M sits relative to the block deck, but Ed will know for sure. Gudgeon pin diameter is 22mm for both so no grief there. Hopefully the 7M piston sits 40 thou (1mm) shy of the block deck at TDC so potentially you could then correct for the 2JZ piston sitting 0.5mm proud of the 7M block by using a thicker head gasket. What all of this will do to your squish area is something else to consider. Certainly Jun, HKS and Toyomoto (in the States) offer stroker kits for the 2JZ(GTE) which bring the capacity out to 3.2 or 3.4 litres (depending on manufacturer). The Jun 3.2 litre kit is 1 million Yen (~ $14000 AUD) and includes a billet crank, forged rods and turbo pistons (however for that price, I'm sure if you specified a high comp piston, they might be obliging....). Sounds like a real tinkery kind of thing to do. I'd probably get a stuffed 7M and a 2JZ piston, have one bore bored to 86 mm and start measuring things. You could just drop a 1UZ in there for a lot less than this is going to cost you....I have to mention it! [Report message to a moderator]

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