Cylender head valves for high boost use on small bore?
Turbo Mini Forums

as above can anyone recommend what valves are good for 20-30 psi boost on a small bore head (202)
also sizes should i favor the intake or exhaust for size ie big intake with small exhaust or small intake big exhaust?

edit will this combo be any good?

http://minisport.com.au/prod1721.htm

http://minisport.com.au/prod1722.htm

Edited by Turbo This.. on 17th Sep, 2013.

If you're planning on running that kind of boost I wouldn't be using those two pice valves, otherwise you could see the head departing from the stem. You want a stainless one piece valve. Though you're a bit limited on size, Minispares sell a larger inlet:

[url]http://www.minispares.com/product/Classic/Engine/Cylinder_heads/Valves_accessories/C-AEG588.aspx?100410&ReturnUrl=/search/classic/inlet valve.aspx|Back to search[/url]

& exhaust valve:

[url]http://www.minispares.com/product/Classic/Engine/Cylinder_heads/Valves_accessories/C-AEG587.aspx?100410&ReturnUrl=/search/classic/exhaust valve.aspx|Back to search[/url]

Though depending on the condition of the exhaust seat that valve may not be large enough to reclaim the seat.
Fitting the 29mm exhaust from a 1275 head would be an option, though these valves are longer so the springs need to be packed accordingly & it will upset rocker geometry a little.

Phil.

Edited by Turbo Phil on 17th Sep, 2013.

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