Machining Pistons to run 20v head... And FCR's on a 20v?
09-11-2013, 07:17 PM
Post: #1
Machining Pistons to run 20v head... And FCR's on a 20v?
Anyone up on this?

I might be running a 20v head on my 16v, is pocketing a high comp 16v forged piston to take the 5th valve something that can be done?

Also, anyone ran FCR's on a 20v head? This head has no VVti to worry about, so my current FCR's should theoretically go on with a new inlet manifold and a Dizzy relocation kit.. Right?


Driftworks - - DangerStyle - NightSpirit
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09-15-2013, 01:08 AM
Post: #2
Machining Pistons to run 20v head... And FCR's on a 20v?
[Image: AEU86 AE86 - Machining Pistons to run 20... on a 20v?]

Quote:At the time I built this engine no one did decomped 5 valve pistons,
so I bought some Arias forged and then custom flycut the pistons
myself on a mill to suit the ST head, I then blended the valve pockets
so there were no nasty sharp edges, then balanced the whole assembly.
One Aussi did this when building a 20V turbo engine, so I guess it is
possible. Might pay to get an old 16V piston and drill a few holes to see
how much meat there is in the dome where you need to cut... and
measure the valve to piston clearances very carefully.

Cheers... jondee86
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