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Author Topic: Bigger valves in F2 head  (Read 1284 times)

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Offline dragracer

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Bigger valves in F2 head
« on: April 06, 2011, 09:59:02 am »
Is it possible to put larger valves in the F2 head on the stock seats or to install larger seats to accommodate bigger valves????????
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Offline classic bike tuner

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Re: Bigger valves in F2 head
« Reply #1 on: April 06, 2011, 10:32:22 am »
yes is possible   :  i have used mitsubishi  valves  35 mm   are to long need to be shortend  and  new groove for the collets after that the tip needs to be hardend with stellite  [welding]
these are 6,5 mm stem

http://cgi.ebay.com/ebaymotors/4G63-stainless-valves-stock-size-H-P-Eclipse-Turbo-_W0QQcmdZViewItemQQhashZitem588d5a956cQQitemZ380328645996QQptZRaceQ5fCarQ5fParts

you get a complete set of 16 valves  so you can do 2 engines   ;D
« Last Edit: April 06, 2011, 10:34:33 am by classic bike tuner »
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Offline kos

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Re: Bigger valves in F2 head
« Reply #2 on: April 06, 2011, 10:43:14 am »
We ran an special F2 head with 35mm intakes and 30mm ex valves on standard seats. We went down on EX valve from 31mm to 30mm to  make sure we had enough clearance between valves at different valve events. Intake went up from 34mm to 35mm.

KOS
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