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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Motorman on July 10, 2015, 03:29:24 PM

Title: Fox 35 Speed Fantasy Engine Build
Post by: Motorman on July 10, 2015, 03:29:24 PM

Ok you know the rules, must use at least the Fox 35 crankcase and must remain plain bushing. Here we go:

Crankcase Fox 35, 50th or 60th anniversary for most metal. Head and backplate bolts tapped 5-40 and motor mount lugs machined flat for pan mount

Piston and sleeve, SuperTiger G21-29 ABC  will fit by taking .010" off the OD

Conrod, 7075-T6 custom length and bushed with phosphor bronze.

No more baffle so head can be billet hemi with turbo plug and generously finned for cooling (plain bushing runs hot)

Crank, custom solid 4130 shaft no timing hole, full circle crank web and counter balance with extended crank pin

Back plate, billet rear valve with SuperTiger disk timing 35/60

Venturi, 5/16" with SuperTiger NVA


Your turn,
MM

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: C.T. Schaefer on July 10, 2015, 04:34:37 PM

Cool phantasy! But not mine. Got my own. >:D

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: Paul Smith on July 10, 2015, 07:20:23 PM

There's a whole AMA Rule Book full of events where you can build an engine and not be hindered by the Fix case.

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: Motorman on July 12, 2015, 02:05:18 PM

Tommy, did you find a turbo charger small enough to fit a Fox?


MM

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: bob whitney on July 12, 2015, 02:27:22 PM

i have plans for a supercharger

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: Motorman on July 12, 2015, 06:29:47 PM

But it still has to be rear valve or the crank will snap right? Isn't there something in the speed rules about super chargers?

MM

Title: Re: Fox 35 Speed Fantasy Engine Build
Post by: Paul Smith on July 13, 2015, 12:05:04 PM

Supercharges are legal.  Just not compressed gas cylinders.