Chris Wilson Posted February 8, 2007 Share Posted February 8, 2007 The stock MKIV TT pistons are cast with a cooling gallery in the crown, like Skyline ones, fed with oil from a fairly large oil squirter hole in the con rod. All the forged ones I have yet to see haven't got this gallery. I found Tomei ones for my own Skyline engine that are forged, and have a cooling gallery. They don't do Toyota ones thaogh. I am 90& sure they don't exist, which is a shame as they remove a LOT of heat very effectively. Anyone seen any? Quote Link to comment Share on other sites More sharing options...
ajazyasin Posted February 8, 2007 Share Posted February 8, 2007 what would they look like? Quote Link to comment Share on other sites More sharing options...
bondango Posted February 8, 2007 Share Posted February 8, 2007 2JZ at bottom http://www.tomei-p.co.jp/_2003web-catalogue/058_EJ22_piston.html#2JZ And explanation of oil cooling proporties.. http://www.tomei-p.co.jp/_2003web-catalogue/050-051_piston.html You'l need to google-translate Quote Link to comment Share on other sites More sharing options...
ajazyasin Posted February 8, 2007 Share Posted February 8, 2007 ahhhhh! ok:) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 8, 2007 Author Share Posted February 8, 2007 2JZ at bottom http://www.tomei-p.co.jp/_2003web-catalogue/058_EJ22_piston.html#2JZ And explanation of oil cooling proporties.. http://www.tomei-p.co.jp/_2003web-catalogue/050-051_piston.html You'l need to google-translate I don't think the Tomei 2JZ-GTE are available with cooling channels. I have the English vesrion of the cooling channel info at: http://www.chriswilson.tv/tomei/efr_index.html Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 8, 2007 Author Share Posted February 8, 2007 The price is far too cheap for them to be CC pistons, for a start. Quote Link to comment Share on other sites More sharing options...
Alex Posted February 8, 2007 Share Posted February 8, 2007 Hmm how much do the Tomei's weigh? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 8, 2007 Author Share Posted February 8, 2007 Hmm how much do the Tomei's weigh? My Skyline RB26 ones at 86.5 mm, with cooling channels, were 475 grammes from the factory, with titanium coated rings and pins fitted. I got them down to 430 grammes by machining and hand finishing. I could get more off them with modern tapered pins, but didn't go that far. I can find no reference to Toyota 2JZ-GTE pistons on their current site, using the English option, sorry. Quote Link to comment Share on other sites More sharing options...
bondango Posted February 8, 2007 Share Posted February 8, 2007 Sorry Chris not something ive looked at TBH, noticed the 2jz listing on the site a while back, but after just checking it seems that the 2jz isnt the only one not covered for the OC'd forged. Ive found the english stuff i had on the OC's forgies.. Quote Link to comment Share on other sites More sharing options...
Wez Posted February 8, 2007 Share Posted February 8, 2007 From 320deg to 260deg on top of the piston, thats a huge difference. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 8, 2007 Author Share Posted February 8, 2007 From 320deg to 260deg on top of the piston, thats a huge difference. It is, that's why the OE pistons have this, it allows a cast piston to work where a potentially noisy, and more expensive forged one would normally be used. It's also why these turbo engines generate such high oil temps. Quote Link to comment Share on other sites More sharing options...
Wez Posted February 8, 2007 Share Posted February 8, 2007 Its mad when you think what is actually going on at 6500rpm Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 8, 2007 Author Share Posted February 8, 2007 Its mad when you think what is actually going on at 6500rpm Even madder at 20,000 RPM plus! Quote Link to comment Share on other sites More sharing options...
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