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04-23-2011, 09:40 PM
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#1 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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It's an oversized piston for a Toyota Crown 7M. 0.50 over.
Which also means that block and head have probably been shaved at least once before they got to you. The part number for the Supra 7M-GE in that size is 42070.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal.  Tip Jar --->  Last edited by cre; 04-23-2011 at 09:45 PM. |
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04-24-2011, 01:55 AM
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#2 |
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walbro fp
Join Date: Dec 2010
Location: spokane
Posts: 479
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hmm. well they spec out at stock bore (83mm...) so idk how they could be .50mm/.020 over. both sets are stock bore for a 7mge, so now im really confused.
as far as i could find, the crown only used the 7mge for 4 years, 87-91, then they switched over to the jz series or various other 4 cyl and diesel motors. doesnt say whether they were high compression, but since it would be a jdm motor, its very possible. either way, its too bad we cant order pistons like that for our 7ms. id buy a set. might strip these down and use them on another block.
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87 toyota 4x4 single cab short box pickup, 7MGZE. |
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04-24-2011, 02:21 AM
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#3 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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It's possible they're from a different engine altogether and as such the first five digits are different. But out of the 7M's family, that number would be for 0.50 over sized pistons (yes, 0.50mm). I can't find anything else and nothing pertaining to the MKIII Supra or any North American vehicles. If you research it and find more I'd love to know. I'd speculate about it being a superseding p/n if not for the fact that it's already taken.
BTW - Toyota liked that bore... there are a number of pistons which will fit the 7M but aren't meant to.
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04-24-2011, 02:38 AM
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#4 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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Are they Aisin pistons?
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04-24-2011, 03:24 AM
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#5 |
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walbro fp
Join Date: Dec 2010
Location: spokane
Posts: 479
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yep they are aisin, its cast onto the opposite inner piston skirt. yea im curious too. ill see what i can dig up, might have to see about calling a few dealerships, or tomoco themselves.
the last few dealers i called didnt know jack shi* bout anything..  if i find out more ill post it up tho.
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87 toyota 4x4 single cab short box pickup, 7MGZE. |
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04-24-2011, 05:16 AM
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#6 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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It may also be used in the Cressida too, but the difference in compression ration is news to me... Then again, the Crown was an interesting case; It even had traction control available for the 7M.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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04-24-2011, 05:54 AM
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#7 |
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walbro fp
Join Date: Dec 2010
Location: spokane
Posts: 479
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yea its news to me too. the fact i got two motors with the same pistons is kinda crazy.
but yea, never seen em b4 with a stock motor. then again, out of the 3 ive seen apart, two have had the high compression bits.
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