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

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ed_ma61
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Lost in the K hole
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May 2002

Re: 7MGE bore spacing and overbore limit	Wed, 13 August 2003 14:31

hehehe...ok with an 83.5mm bore, youre looking at a grande 6.78mm between the bores. you bore the sucker out to 86.00mm, and youll have 4.28mm between the bores the HKS mhg bore dia is 85.80mm, and this is not allowing for any reduction in dia when you torque the head down and compress the gasket. dont forget, the head gasket needs block material at its edge to bite into, ie you cant have the mhg the exact same dia as the block bore. so, at a wild guess, id say 85.00mm is the max bore size catered for by that mhg. like i mentioned above, smart machining of existing components will yield you a pretty high performance 7m. there is plenty of scope within the factory tolerances to be quite creative. redline is your only enemy unfortunately. probably maxing out around the ~7000k mark. the 7m's talent is in its bottom end torque (thankyou stroke) and its best to remember this when planing mods. attempts to make it a high revving beast are misplaced... its not all bad, brute numbers are still on its side thats where the 2jz is different, you lose the low end torque, but gain rpm freedom (and overall just higher torque figures at higher rpm) with which to play (8000rpm). this opens up a can of worms with cams etc which are not as well utilised by the 7m. but with cams comes BIG $$$$ 2 different engines really. i just like the 7m cause theyre so plentiful and relatively cheap, you can go nuts hacking into them, and if you balls it up, its not much of a saga that and i cant afford the cams, so the 7m can offer me more in other areas which i can maximise without having to spend too much i dont wreckon 2.989891 Litres, 11:1comp/r, twin throttles, head port and extractors will go too shabbily (all on the stock ecu) cheers ed [Report message to a moderator]

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