Originally Posted by fast75vega
Originally Posted by Rigsby
I love both stories (wazup & fastvega) about the budget motors & cast bottom ends (and stock 305 rods) in motors running in the 10's & spinning 7K to 8300... that is awesome!! Gives us hope & courage to build on a budget with results!! Of coarse- like wazup says within reason & balanced well.
my motor was balanced and no noticeable vibration at all and 100 pounds of oil pressure going do the track... 45 pounds at idle :wink: i was told by a few old racer/motor builders including the man that builds my motors ... that for every 10 pounds of oil pressure...you can spin a motor 1000 rpm's.... i like to leave a buffer zone and never fully tested their theory..... lol they say the crank/rods fail when the oil barrier between the two fails and you get metal on metal.... it made sense to me and they been racing long before they had all these aftermarket parts now days
I have heard this theory too; but I assume you would need to be more concerned about valve float & failing top end before the bottom would fail?? Wazup's motor shifted at 8300 & you shifted at 7K... could you really see that much more gain out of the power curve w/ 1300RPMS more above 7K? I assume this must have been a bigger difference in cam specs & head flow? I could build a motor similar pretty cheap & maybe reduce the comp some & run pump gas for street w/ 4spd.... it would be fun & cheap... sorry for the hi-jack on this thread.