Piston to valve clearance

[ddeane]

Hi
In the process of assembling my new engine. It is a 1GG with a HKS (2GG) head. The HKS head has 1mm bigger inlet valves and the HKS cams provide increased lift. Have checked the clearance - assembled engine with modeling clay on top of the piston and rotated everything - unfortunately I have only 25 thou clearance with the inlets, exhaust are all ok. Reference indicates that I should be aiming at 100thou, approx 2.5mm.

After advice on who in the ACT I could entrust the pistons to. Has anyone have experience with anyone.

Cheers Craig

[Billzilla]

After advice on who in the ACT I could entrust the pistons to. Has anyone have experience with anyone.

Neil Trama, none better - http://www.neiltrama.com
You'll be needing at least 0.060" clearance as well.

[ddeane]

Neil Trama, none better - http://www.neiltrama.com
You'll be needing at least 0.060" clearance as well.

Thanks for the response. Mate you don't know where Neil has got to do you? Cos I can't seem to track him down.

Cheers Craig

[Billzilla]

He's shifted house recently, I'm not sure of his new address but you should be able to contact him through his web site.

[ddeane]

Thanks. Managed to find his mobile number. He closed his business some years ago and now only does some work at home and restricts himself to Lotus cars.

Cheers Craig

["Z" UTE]

Craig, give Batesy a call, I am sure his engine machinist could fly cut those pistons, for you. Steve Millar has a piston jig that may be suitable for locating the pistons in a milling machine.

The alternative is to close and hone the big ends of the conrods. This will effectively shorten the rods.

cheers Chuck.

[allencr]

The alternative is to close and hone the big ends of the conrods. This will effectively shorten the rods.

WTF Yes, 2 or 3 HGs are also effective!!
Make a cutter out of an old valve by grinding some notches in it.
Solder, silver solder, braze a cutter on an old valve.