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Bill Baer · 07-15-2010, 07:30 AM

Tweaker

Well yea, if you don't have any problems somewhere between 250-300 passes I usually leak it down and if it leaks less than 10% it's fine.
I do however check the valve lash and valve spring seat pressures, change the oil and check the oil filter every 15-20 passes.
I also keep a close eye on MPH if it's off more that 2-3 MPH I start checking things
(Fuel filter, fuel pressure, ignition timing, valve lash/springs and if I'm real nervous I take the oil filter apart and check it for bearing materials)
The motor in the car has ~120 passes on it and the one I pulled out had ~300 and I need to freshen it (i.e. new: valves ,valve springs, roller lifters, pistons, rods and depending on the magnaflux inspection, maybe the crank).

Note this is based upon a steel connecting rod, stainless steel valve motors that I turn >7500 usually 7200 I wouldn't trust aluminum connecting rods for more than ~ 100 passes, less than that if you drive the motor down in the shutdown area.

07-15-2010, 07:30 AM	#12
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Dragster maintenance Tweaker Well yea, if you don't have any problems somewhere between 250-300 passes I usually leak it down and if it leaks less than 10% it's fine. I do however check the valve lash and valve spring seat pressures, change the oil and check the oil filter every 15-20 passes. I also keep a close eye on MPH if it's off more that 2-3 MPH I start checking things (Fuel filter, fuel pressure, ignition timing, valve lash/springs and if I'm real nervous I take the oil filter apart and check it for bearing materials) The motor in the car has ~120 passes on it and the one I pulled out had ~300 and I need to freshen it (i.e. new: valves ,valve springs, roller lifters, pistons, rods and depending on the magnaflux inspection, maybe the crank). Note this is based upon a steel connecting rod, stainless steel valve motors that I turn >7500 usually 7200 I wouldn't trust aluminum connecting rods for more than ~ 100 passes, less than that if you drive the motor down in the shutdown area. __________________ Bill Baer 3391 SC, 339B SC, QR Last edited by Bill Baer; 07-15-2010 at 01:31 PM.