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Old 11-26-2013, 10:14 PM   #55 (permalink)
BGTV8
A True Z Fanatic
 
Join Date: Dec 2009
Location: 03350 Australia
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Quote:
Originally Posted by phunk View Post
BTW I am curious if you guys are interested in this.

I have thought about constructing pistons that would be compatible with both VHR and HR cylinder heads. This means anyone who wants to make the change immediately or down the road is clear to go and will not have to do the bottom end again.

I already discussed this with CP and the conclusions we came to was that this was most likely very possible. We have to compare the valve angles between the HR and VHR cylinder heads and do a little math... but by adding some well planned exhaust valve reliefs to the pistons we could probably have a piston for the VHR bottom end with HR or VHR heads. Some research also has to be done to determine if this will or will not change the CR between one head and the other.

I was concerned about if you guys would care for this or not. I wasnt sure if people would feel there is a compromise in the pistons design to accommodate cylinder heads that they are not running. But this would sure be a lot easier on me for stocking in the future. On top of that, I am currently leaning more towards HR heads for my build, but I am not ready to commit to them yet... but I want to start my bottom end build!
So, if you can look at 13.0:1 in VQ37 bottom end with HR heads and 14mm peak lift I am interested (planning E85 NA engine for VQ engined sports car here in Oz). Std VQ37 stroke and rod-length. Key issue is sufficient meat on the crown to allow for valve relief .... bit off topic for this thread, BUT signalling my interest.
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