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gvr4 · 01-05-2013

The rods were machined for the bigger wrist pin.

The reason it's my intake valves that are so close is that the evo valve reliefs are backwards compared to the dsm, so the exhaust is sitting in the intake valve relief, which is fine, but the other valve relief is smaller, so the intake valve can't fit inside its relief. So normally, you're right, the closest point would be when the piston is chasing the exhaust valve closed on the exhaust stroke.

What's your valvetrain like in your race motor? I'm running all stock stuff, so I think I'll keep my revs a little lower with that tight of clearance.

01-05-2013	#20
gvr4 New Member Join Date: Sep 2012 Location: North Branch Drives: I walk. Too many broke vehicles Posts: 40	Re: Piston to valve Clearance? The rods were machined for the bigger wrist pin. The reason it's my intake valves that are so close is that the evo valve reliefs are backwards compared to the dsm, so the exhaust is sitting in the intake valve relief, which is fine, but the other valve relief is smaller, so the intake valve can't fit inside its relief. So normally, you're right, the closest point would be when the piston is chasing the exhaust valve closed on the exhaust stroke. What's your valvetrain like in your race motor? I'm running all stock stuff, so I think I'll keep my revs a little lower with that tight of clearance.