Re: Molnar rods
[Re: J_BODY]
#2171153
10/09/16 10:18 PM
10/09/16 10:18 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
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I Live Here
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Mt. Vernon, Ohio
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Andy, you are going to like them, I have the 6.535 rod in my 512, and they checked out spot on.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Molnar rods
[Re: birdtracker]
#2171337
10/10/16 07:30 AM
10/10/16 07:30 AM
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Joined: Mar 2006
Posts: 9,841 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,841
MI, usa
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What do you think the horsepower limit is on those? Birdtracker Mines never been on the dyno but runs 9.0@148 3350lbs. 7.100" Molnar with 2.200 pin". Bob weight with a little careful ring pack choice was less than with my BME aluminum rods. Doug
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Re: Molnar rods
[Re: birdtracker]
#2171364
10/10/16 10:26 AM
10/10/16 10:26 AM
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Joined: Apr 2003
Posts: 3,514 Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,514
Tulsa, Oklahoma
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What do you think the horsepower limit is on those? Birdtracker If you ask that question of Tom Molnar (who is a great guy), he will tell you horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM. Give him the weights and he can tell you the RPM you should not exceed with the rod. Bill
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Re: Molnar rods
[Re: 340Cuda]
#2171450
10/10/16 01:29 PM
10/10/16 01:29 PM
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Joined: Mar 2006
Posts: 9,841 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,841
MI, usa
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What do you think the horsepower limit is on those? Birdtracker If you ask that question of Tom Molnar (who is a great guy), he will tell you horsepower has nothing to do with it. It is a function of piston/pin/ring weight and RPM. Give him the weights and he can tell you the RPM you should not exceed with the rod. Bill Exactly. I told Tom my piston/ring/pin weight along with no power adder. Gave him a self imposed 7500 rpm limit. He said that they were more than enough. Doug
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Re: Molnar rods
[Re: AndyF]
#2173930
10/13/16 07:21 PM
10/13/16 07:21 PM
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Joined: Jan 2003
Posts: 2,094 central texas
krautrock
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,094
central texas
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Wait until you see the pistons for this engine. JE is designing a Mopar big block piston based off the LS design. The sides are moved in so the pin is shorter than normal. Should be really lightweight. sheeeeyit. is it 1.32CH? so it could be used in a 451?
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Re: Molnar rods
[Re: dogdays]
#2173955
10/13/16 07:48 PM
10/13/16 07:48 PM
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Joined: Dec 2013
Posts: 4,680 Wichita
GY3
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master
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Wichita
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That weight total is making me laugh.
The stock piston/rod/rings/pin assembly from my '86 318 weighed more than that! Something like 1540 grams.
Shoot, the late LA motor rod at 758 grams is heavier than AndyF's bigblock rod!
R. It looks like my numbers (in the other thread) translated to over 6 lbs. of savings in the rotating assembly vs. the factory LY rods and cast pistons.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Molnar rods
[Re: AndyF]
#2173956
10/13/16 07:49 PM
10/13/16 07:49 PM
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Joined: Dec 2013
Posts: 4,680 Wichita
GY3
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master
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Wichita
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Wait until you see the pistons for this engine. JE is designing a Mopar big block piston based off the LS design. The sides are moved in so the pin is shorter than normal. Should be really lightweight. I'm curious to see rod/piston total!
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Molnar rods
[Re: '72CudaRacer]
#2174062
10/13/16 09:53 PM
10/13/16 09:53 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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same here with Icon pistons.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Molnar rods
[Re: krautrock]
#2174436
10/14/16 11:42 AM
10/14/16 11:42 AM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Wait until you see the pistons for this engine. JE is designing a Mopar big block piston based off the LS design. The sides are moved in so the pin is shorter than normal. Should be really lightweight. sheeeeyit. is it 1.32CH? so it could be used in a 451? Yes it will be, that is the rod length and piston Ch I have with my 3.9 stroke crank.
running up my post count some more .
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Re: Molnar rods
[Re: GY3]
#2174437
10/14/16 11:43 AM
10/14/16 11:43 AM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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That weight total is making me laugh.
The stock piston/rod/rings/pin assembly from my '86 318 weighed more than that! Something like 1540 grams.
Shoot, the late LA motor rod at 758 grams is heavier than AndyF's bigblock rod!
R. It looks like my numbers (in the other thread) translated to over 6 lbs. of savings in the rotating assembly vs. the factory LY rods and cast pistons. Factory piston and pin in a big block mopar is a little over 1000 grams.
running up my post count some more .
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Re: Molnar rods
[Re: AndyF]
#2174903
10/14/16 10:57 PM
10/14/16 10:57 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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master
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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 12:41 PM
10/15/16 12:41 PM
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Joined: Apr 2003
Posts: 3,514 Tulsa, Oklahoma
340Cuda
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master
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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 03:33 PM
10/15/16 03:33 PM
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Joined: Dec 2013
Posts: 4,680 Wichita
GY3
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master
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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. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Molnar rods
[Re: GY3]
#2175436
10/15/16 08:19 PM
10/15/16 08:19 PM
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Joined: Jan 2003
Posts: 6,351 Aurora, Oh.
max_maniac
master
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master
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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 05:49 PM
10/17/16 05:49 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
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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 06:19 PM.
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