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Re: Molnar rods
[Re: AndyF]
#2174903
10/14/16 09:57 PM
10/14/16 09:57 PM
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Joined: Oct 2007
Posts: 4,228
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,228
New York
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horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM
X2, reciprocating weight X RPM^2 (with a tiny adjustment for rod thrust angle) determines rod breakage.
Boffin Emeritus
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Re: Molnar rods
[Re: polyspheric]
#2175199
10/15/16 11:41 AM
10/15/16 11:41 AM
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Joined: Apr 2003
Posts: 3,584
Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,584
Tulsa, Oklahoma
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horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM
X2, reciprocating weight X RPM^2 (with a tiny adjustment for rod thrust angle) determines rod breakage. Could you go through a calculation of this for us?
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Re: Molnar rods
[Re: 340Cuda]
#2175303
10/15/16 02:33 PM
10/15/16 02:33 PM
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Joined: Dec 2013
Posts: 4,918
Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,918
Wichita
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horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM
X2, reciprocating weight X RPM^2 (with a tiny adjustment for rod thrust angle) determines rod breakage. Could you go through a calculation of this for us? Don't encourage him...
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
9.92 @ 135mph with a 350 shot of nitrous and 93 octane pump. 1.43 60 ft. 3,750 lbs.
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Re: Molnar rods
[Re: GY3]
#2175436
10/15/16 07:19 PM
10/15/16 07:19 PM
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Joined: Jan 2003
Posts: 6,363
Aurora, Oh.
max_maniac
master
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master
Joined: Jan 2003
Posts: 6,363
Aurora, Oh.
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horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM
X2, reciprocating weight X RPM^2 (with a tiny adjustment for rod thrust angle) determines rod breakage. Could you go through a calculation of this for us? Don't encourage him... 
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Re: Molnar rods
[Re: max_maniac]
#2177074
10/17/16 04:49 PM
10/17/16 04:49 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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Actually there is a spreadsheet that has the program built into it to calculate acceleration and velocity of the piston for any stroke, rod length and rpm. I have it on my computer, don't know how to attach it, maybe I'll figure it out.
R.
Note in the spreadsheet the max acceleration numbers are always at the top, where velocity = zero. These numbers have units of ft/sec^2. To convert to Gs we divide by 32.2.
60,085 / 32.2 = 1,866 Gs. At that point a 500 gram piston is exerting an outward pull of 933kg or 2,055 lb.
Last edited by dogdays; 10/17/16 05:19 PM.
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That's almost a unthinkable as a modern combustion chamber or a cam not designed 50+ years ago.