Lightweight crank pulley - Page 7 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

effty_ac · 01-08-2014, 06:42 PM

[ame="http://www.youtube.com/watch?v=aZbe4bQTTCo"]http://www.youtube.com/watch?v=aZbe4bQTTCo[/ame]

jonbonazza · 01-08-2014, 07:16 PM

Apoc · 01-08-2014, 08:34 PM

Quote:

Originally Posted by stugray

You are correct. What some on here fail to understand is that you have more energy stored to use when you shift with the heavier components.
Same thing applies to lightened flywheels.
If you lighten your flywheel & pulley (all rotating mass) and try to "peel out" from a stop, you will have a much harder time than if you had the heavier rotating mass.

Ok a spinning crank pulley has kinetic energy which to my knowledge is not considered potential energy or stored energy. Also the rotating mass of the crank pulley is miniscule compared to rotating mass of the engine itself. I don't think a couple of pounds off the crank pulley will limit your ability of doing a burnout.

tennisfreak · 01-08-2014, 08:55 PM

My pulley kit has not limited my ability to do a burnout.
I'm trying to blow through these cheap ass stock tires so I burn out all the time!

Apoc · 01-08-2014, 09:05 PM

Quote:

Originally Posted by Monogram

http://www.engineeringtoolbox.com/fl...rgy-d_945.html

So it's still kinetic energy and won't make heavy flywheels allow a car to accelerate faster as they don't have more energy than what the get transferred from the engine. What you're saying is the kinetic energy present in the pulley will transfer back through the whole drive train and make the car accelerate faster?? Maybe for about a couple seconds after you drop the clutch. Funny thing is as you lighten rotating mass it becomes easier to accelerate. You are correct in that this pulley really only can show this when free revving so the real benefit is only faster throttle response.

Apoc · 01-08-2014, 09:17 PM

I

fizics

twag4 · 01-08-2014, 11:00 PM

Any additional rotating mass is going to be parasitic as RPMs increase, and will sustain revolution, kinetic motion upon RPM reduction. All added mass will both decrease rate of acceleration and decrease rate of deceleration. As someone else said, the further away from the center of rotation the weight is, this will have a slowing effect on acceleration and deceleration. Think of the figure skater who brings her arms and legs in, her RPM increases significantly with no other effort on her part. Sit on a stool that spins and turn with your legs and arms sticking out, then suck them in tight and your rotation will accelerate and you will likely be flung onto the floor. The point of my post is this: if you want a lighter pulley, buy it. If not, then don't. End of physics

Turdinator · 01-09-2014, 03:56 AM

This is a hilarious thread. Can we all just agree that lightening the rotating mass on an engine is good unless you are partial to revving it up and dropping the clutch. Ie in gear acceleration benefits from lightness and hard launches and clutch kicking benefit from more weight.

Captain Snooze · 01-09-2014, 04:22 AM

Quote:

Originally Posted by Turdinator

This is a hilarious thread. Can we all just agree.... .

No, because if you are microwaving popcorn there is no way a lightweight pulley will make it taste any better.

Ganthrithor · 01-09-2014, 04:38 AM

Quote:

Originally Posted by Captain Snooze

No, because if you are microwaving popcorn there is no way a lightweight pulley will make it taste any better.

I hear you can microwave popcorn with cell phones. I saw it in a youtube video once: it must be true. Lets have an internet debate about it!

Turdinator · 01-09-2014, 04:51 AM

Quote:

Originally Posted by Ganthrithor

I hear you can microwave popcorn with cell phones. I saw it in a youtube video once: it must be true. Lets have an internet debate about it!

No, no you got it wrong. You can recharge phone batteries by putting them in a microwave...

Captain Snooze · 01-09-2014, 04:54 AM

Quote:

Originally Posted by Turdinator

No, no you got it wrong. You can recharge phone batteries by putting them in a microwave...

What kind of sauce goes well with them?
(Ffs!! Google Images isn't returning anything of use when I search "batteries sauce".)

Captain Snooze · 01-09-2014, 05:11 AM

Feeling peckish,what to eat?
Maybe a serving of pickled feet
Just remembered can not do that
Already eaten the legs off the cat
A dish of batteries is what'll have
Has to be better than a battered sav
Bit of garlic to complement
The taste of acid condiment
A twelve volt sandwich will be fully
Just so tasty with a lightweight pulley

Turdinator · 01-09-2014, 05:14 AM

Phone in microwave...

01-08-2014, 09:17 PM	#90
Apoc Senior Member Join Date: Jul 2012 Drives: Raven FR-S 6M Location: Calgary, Canada Posts: 638 Thanks: 348 Thanked 375 Times in 232 Posts Mentioned: 3 Post(s)	I fizics __________________ “The World is Flat” [\|\|•]=(86)=[•\|\|]

01-09-2014, 03:56 AM	#92
Turdinator Señor Member Join Date: Aug 2012 Drives: 86 GT/'74 TA22 Celica/Kangaroo Location: Melbourne, Australia Posts: 1,706 Thanks: 1,107 Thanked 769 Times in 480 Posts Mentioned: 13 Post(s)	This is a hilarious thread. Can we all just agree that lightening the rotating mass on an engine is good unless you are partial to revving it up and dropping the clutch. Ie in gear acceleration benefits from lightness and hard launches and clutch kicking benefit from more weight. __________________ 1974 TA22 Celica 2013 86 GT

01-09-2014, 05:11 AM	#97
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,830 Thanks: 4,058 Thanked 9,576 Times in 4,205 Posts Mentioned: 60 Post(s)	Feeling peckish,what to eat? Maybe a serving of pickled feet Just remembered can not do that Already eaten the legs off the cat A dish of batteries is what'll have Has to be better than a battered sav Bit of garlic to complement The taste of acid condiment A twelve volt sandwich will be fully Just so tasty with a lightweight pulley __________________ My car is completely stock except for all the mods.

01-09-2014, 05:14 AM	#98
Turdinator Señor Member Join Date: Aug 2012 Drives: 86 GT/'74 TA22 Celica/Kangaroo Location: Melbourne, Australia Posts: 1,706 Thanks: 1,107 Thanked 769 Times in 480 Posts Mentioned: 13 Post(s)	Phone in microwave... __________________ 1974 TA22 Celica 2013 86 GT Last edited by Turdinator; 01-09-2014 at 06:28 PM.

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01-08-2014, 06:42 PM	#85
effty_ac Member Join Date: Aug 2013 Drives: 2013 Raven FRS Location: United States Posts: 41 Thanks: 33 Thanked 12 Times in 11 Posts Mentioned: 0 Post(s)	[ame="http://www.youtube.com/watch?v=aZbe4bQTTCo"]http://www.youtube.com/watch?v=aZbe4bQTTCo[/ame]

01-08-2014, 07:16 PM	#86
jonbonazza Senior Member Join Date: May 2013 Drives: 2013 Scion FR-S Location: Aliso Viejo, CA Posts: 503 Thanks: 222 Thanked 177 Times in 80 Posts Mentioned: 3 Post(s)

01-08-2014, 08:55 PM	#88
tennisfreak Senior Member Join Date: Mar 2013 Drives: 2018 BMW M240i Location: Texas Posts: 1,768 Thanks: 692 Thanked 917 Times in 538 Posts Mentioned: 9 Post(s)	My pulley kit has not limited my ability to do a burnout. I'm trying to blow through these cheap ass stock tires so I burn out all the time!

01-08-2014, 11:00 PM	#91
twag4 Senior Member Join Date: Sep 2013 Drives: frs Location: The depths Posts: 749 Thanks: 355 Thanked 427 Times in 241 Posts Mentioned: 5 Post(s)	Any additional rotating mass is going to be parasitic as RPMs increase, and will sustain revolution, kinetic motion upon RPM reduction. All added mass will both decrease rate of acceleration and decrease rate of deceleration. As someone else said, the further away from the center of rotation the weight is, this will have a slowing effect on acceleration and deceleration. Think of the figure skater who brings her arms and legs in, her RPM increases significantly with no other effort on her part. Sit on a stool that spins and turn with your legs and arms sticking out, then suck them in tight and your rotation will accelerate and you will likely be flung onto the floor. The point of my post is this: if you want a lighter pulley, buy it. If not, then don't. End of physics

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