D-series valve compatability
I figure HMT is probably the best place to post this, I would search but I can't find any good terms to use.
I'm wondering if it's worth the time/money and possible machine work to retrofit some larger OEM D-series valves into my B7/A6 head. IIRC both the Z6 and Y7 have larger valves, and I have a spare Z6 head lying around. If anyone can give me pointers, it'd be much appreciated, if it's too much work, I'm just gonna skip it for now. |
Re: D-series valve compatability
Get a valve angle job.
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Re: D-series valve compatability
the valve stems are the wrong length, and with stock bore, the smaller valves flow better.
If you were to go to a 78mm bore/sleeve, you could step up to 1mm larger valves. |
Re: D-series valve compatability
Why the difference in valve size between engines with the same bore then, just curious?
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Re: D-series valve compatability
Originally Posted by Minor Threat
Why the difference in valve size between engines with the same bore then, just curious?
I don't know the lift of a z6/y7 vs. b7/a6 off the top of my head. Just a thought... |
Re: D-series valve compatability
Hrm. It's only a .5mm difference in size, but I guess it is a tiny bore.
Originally Posted by ProzacOverdose
Get a valve angle job.
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Re: D-series valve compatability
Originally Posted by Joseph Davis
Hrm. It's only a .5mm difference in size, but I guess it is a tiny bore.
Yup. |
Re: D-series valve compatability
Eh?
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Re: D-series valve compatability
Should I bother getting a valve angle job done?
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Re: D-series valve compatability
Those pimpshit Big Name valvejobs are just moving the seat radius outward a hair, as much as they can without sucking the valve back into the head under load, and blending the bowl a little. Thusly, unported LS flows as well as stock B16/GSR.
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