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Dimman · 01-17-2011, 03:24 AM

I'm going to re-post the link that one of the new guys threw up in another thread.
http://www.drive.subaru.com/Win11/itsWhatMakes.htm

A couple things I want to discuss. In this pic it shows that the cam carrier is not integral to the head anymore. They say it's done to reduce thickness and weight, but I'm not sure how I feel about it in terms of rigidity. I'm aware that the new finger followers can introduce side loads but don't know if this is significant to the cams/carrier. Or how much rpm would be needed for the carrier's rigidity to be an issue (assuming that it isn't as rigid as a one-piece head/cam carriers).

The second thing is an observation about what they are doing with the injector location. They are going from intake runner mounted injectors to cylinder head mounted injectors. This is the opposite of what Toyota did when going from the 7M to the JZ series. I don't think it'll be a huge issue but I just thought it was interesting that it's the opposite of what Toyota did over 15 years ago.

Finally, we haven't got any confirmation of a Toyota/Yamaha version of this head, particularly mention of the D4-S system. This is starting to get on my nerves. Is it rumour or just closely guarded?

01-17-2011, 03:24 AM	#50
Dimman Kuruma Otaku Join Date: Dec 2009 Drives: Mk3 Supra with Semi-built 7MGTE Location: Greater Vancouver (New West) Posts: 6,854 Thanks: 2,398 Thanked 2,265 Times in 1,234 Posts Mentioned: 78 Post(s)	I'm going to re-post the link that one of the new guys threw up in another thread. http://www.drive.subaru.com/Win11/itsWhatMakes.htm A couple things I want to discuss. In this pic it shows that the cam carrier is not integral to the head anymore. They say it's done to reduce thickness and weight, but I'm not sure how I feel about it in terms of rigidity. I'm aware that the new finger followers can introduce side loads but don't know if this is significant to the cams/carrier. Or how much rpm would be needed for the carrier's rigidity to be an issue (assuming that it isn't as rigid as a one-piece head/cam carriers). The second thing is an observation about what they are doing with the injector location. They are going from intake runner mounted injectors to cylinder head mounted injectors. This is the opposite of what Toyota did when going from the 7M to the JZ series. I don't think it'll be a huge issue but I just thought it was interesting that it's the opposite of what Toyota did over 15 years ago. Finally, we haven't got any confirmation of a Toyota/Yamaha version of this head, particularly mention of the D4-S system. This is starting to get on my nerves. Is it rumour or just closely guarded? __________________ Because titanium.