Author Topic: Lightening rotating assembly  (Read 3344 times)

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Offline Sirdeuce

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Lightening rotating assembly
« on: April 17, 2010, 08:19:58 PM »
Better to lighten flywheel or engine internals? Light weight crank, rods, pistons, with standard weight flywheel. or just removing half the flywheel mass with standard weight internals?
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Offline BigMike

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Re: Lightening rotating assembly
« Reply #1 on: April 17, 2010, 11:28:13 PM »
The flywheel has the largest diameter and thus the largest moment of inertia. Any change to it will make a greater difference than changes made to internal components.

If we can only do one and not both, then I say standard internals with a light weight flywheel. Also we'll retain the durability of the stronger engine internals.
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Offline Sirdeuce

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Re: Lightening rotating assembly
« Reply #2 on: April 17, 2010, 11:52:58 PM »
How 'bout the case of a torquer? 22R in a 4X4 truck. Lighten internals, but use a heavy flywheel.
"I slept with faith and found a corpse in my arms on wakening; I drank and danced all night with doubt and found her a virgin in the morning."

Offline BigMike

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Re: Lightening rotating assembly
« Reply #3 on: April 18, 2010, 01:47:49 PM »
Reciprocating mass is as reciprocating mass does. The case for a truck would be to build up inertia so that slight inclines in the road has less affect on the vehicles velocity, and also when rock crawling, so that a sudden drivetrain impulse doesn't overpower the idle speed torque output of the engine.
-/_/___/__________\___\_\-
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```````````````````````       
R135
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  246

     My 1987 Supercharged 4A-powered 6-speed MR2

Offline Sirdeuce

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Re: Lightening rotating assembly
« Reply #4 on: April 18, 2010, 06:04:13 PM »
Just trying to find a way to reduce overall mass while keeping enough energy stored to lug those low rpm loads. I guess I was thinking it would be better to have all the weight in the flywheel instead of spread throughout the engine.
"I slept with faith and found a corpse in my arms on wakening; I drank and danced all night with doubt and found her a virgin in the morning."

Offline BigMike

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Re: Lightening rotating assembly
« Reply #5 on: April 18, 2010, 10:43:58 PM »
I guess I was thinking it would be better to have all the weight in the flywheel instead of spread throughout the engine.


I think we should do both: light internals and light flywheel. What flywheel are we going to use? We could use my 9-pounder if yours is crazy light.
-/_/___/__________\___\_\-
|______________________|
|-------\___________/------|
```````````````````````       
R135
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  246

     My 1987 Supercharged 4A-powered 6-speed MR2

Offline Sirdeuce

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Re: Lightening rotating assembly
« Reply #6 on: April 19, 2010, 11:53:54 AM »
My flywheel is 9lbs, 200mm. Yours may be better if it's a 212mm.
"I slept with faith and found a corpse in my arms on wakening; I drank and danced all night with doubt and found her a virgin in the morning."

Offline BigMike

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Re: Lightening rotating assembly
« Reply #7 on: April 19, 2010, 06:36:59 PM »
Pictures taken from my SUPER old page located here: http://bigmike.marlincrawler.com/stage1/running_gear/toda_trd/index.html


My TODA wheel, 9.5 lbs:
-/_/___/__________\___\_\-
|______________________|
|-------\___________/------|
```````````````````````       
R135
└┼┼┤
  246

     My 1987 Supercharged 4A-powered 6-speed MR2