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Re: Piston speed, some math to rap your head around! [Re: gregsdart] #3289532 02/14/25 09:59 PM 02/14/25 09:59 PM
Joined: Nov 2010 Posts: 1,398 Carson City, Nevada Biginchmopar pro stock
Biginchmopar pro stock Joined: Nov 2010 Posts: 1,398 Carson City, Nevada	Originally Posted by gregsdart I was curious just how much stress i put on my 549 spinning it 8,000 rpm and came up with this. At 4.315 stroke, at max piston speed, that piston goes up to 102 mph at roughly mid stroke, then back to zero at tdc and bdc. Piston speed calcs say 5800 . I am happy to report no pistons left thier assigned positions!! I'm glad to report nothing has let the block yet. 4.100" Stroke 9500 rpm You have to keep things light that's for sure!

Re: Piston speed, some math to rap your head around! [Re: Biginchmopar] #3289570 02/15/25 01:31 AM 02/15/25 01:31 AM
Joined: Aug 2003 Posts: 44,266 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 44,266 Bend,OR USA	I think the blown alcohol motors are spun up to and over11,500 RPM I do know a former PSCA 10.5 outlaw racer that replaced the rods and pistons every 30 runs or so, I'm thinking he would never tell me the truth about where he shifted that BAE billet hemi motor The engine builder did slip once when I said something about shifting one of those motors near 10,000 RPM, he indicated that they shifted that motor over that, probably nearer 11,500 RPM Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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