11-27-2013, 06:59 PM
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#11 (permalink)
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Base Member
Join Date: Feb 2012
Location: Ontario
Posts: 61
Drives: '10 Nissan 370Z M6
Rep Power: 14
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Quote:
Originally Posted by phunk
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!
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I,for one, won't be going to HR heads. I remember reading an article on the differences between the VHR and the HR and one of the things that they pointed out was that the HR head had "sharper" edges in the combustion chamber compared to the VHR. This, although it might not seem that big of a deal, could potentially cause hot spot in the combustion chamber... not exactly what you want in a high compression boosted engine.
Phunk, do you think you could work in a group buy for CP rods also? Maybe get a bit of a cheaper price from CP for the combo? Or free coating?
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