First Generation Firebird-L Mailing List .........................................................................
I took my engine into the machine shop today to get an opinion on the drag (rotating torque) of my rotating assy. One guy, 30 years building experience, said its a little tight but shouldn't be a problem. The second guy, 25 years experience, said it's f'd up. I have about 45 to 50 ft-lb rotating torque, which is too tight. After a couple of hours taking things apart, measuring, debating specs, etc., we determined it is the oil ring set. The compression rings also seem to need some filing but its the oil ring set that is causing the massive friction. If you are doing a rebuild, you may want to stay away from Sealed Power pistons and rings. My bore/piston clearance is exactly to their recommended spec, 25 thousandths. But, things are way too tight. Butler said ignore the spec and go with about 40 thousandths, which is a bit of a leap of faith and another honing charge. I'll be calling the tech tomorrow since my machine shop can't give a solid recommendation for a fix, besides b uying a new set of rings to see if that fixes the problem. Sheen > > Does anyone know what the rotating torque spec is for a 400 or 455. This is > > the check you do after you have installed the crank and all 8 pistons and > > you are checking to see that there is not too much drag. I have an engine > > building guide book that says 20 to 30 ft-lb but this is not specific to > > our motors. > > Thanks,> Sheen> _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[EMAIL PROTECTED]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/> Donations: <http://FirstGenFirebird.org/store/cart.mv?999999> FGF Merchandise: <http://FirstGenFirebird.org/store>
