Lightened Flywheel Thread

[Enchanter]

Taking weight off the crank pully will help but not nearly as much as the flywheel simply because there is far more power needed to accelerate the flywheel due to the weight being further from the center.

[Rodger]

I know BRD Racing in the US make an alloy crank pully for the T series motors.

http://www.brdracing.com/brdcatalog03.html

Regards

Rodger

[jezza323]

Taking weight off the crank pully will help but not nearly as much as the flywheel simply because there is far more power needed to accelerate the flywheel due to the weight being further from the center.

thats true, but every lil bit counts sometimes!

[sillycar chick]

I think I might make myself a lightweight crank pulley for my 20v, doesnt matter which end the weights removed from right?

Just for your interest:
http://www.technotoytuning.com/productdetail.php?p=121

[Sam_Q]

thanks for the links, I would go for the crank pulley because I can make it smaller at the same time

[love ke70]

dragging it up again but id be wary of going an aluminium front pulley as they do not have the rubber ring so its not a proper harmonic balancer.

[love ke70]

if by making it smaller you mean reducing the radius remember this will spin all your ancillaries run faster. which is often not a good idea.

if you mean width ill just go back to my box

[WDE_BDY]

Smaller crank pulley will spin acessories slower, smaller accessory pulley will spin accessory faster.

Callum

[love ke70]

hes right.

im tired

how far will you be revving the motor?
if your not going much more than stock and its a daily i wouldnt consider it a very bright idea.
you WILL lose oil pressure low in the revs
if my 1g is anything to go by quite a bit at idle speeds

[Billzilla]

you WILL lose oil pressure low in the revs

How do you figure that? The front pulley has nothing to do with the oil pump.
If you're going to make a new pulley, I'd be making a new larger one for the alternator as it doesn't need to spin as fast as it does.
Just leave the stock front pulley and run the alternator at around 120% of crank speed.
I also ran a 3kg alloy flywheel on the back of my engine and it was fine ..... once you got used to it.

[Rodger]

Rubber ring in which engine's front pulley?

The T and R series motors do not have them. Do the A series?

I am sure that a motor which is being developed with lightweight spinning mass does not need a harmonic balancer type pulley.

Regards

Rodger

[YLD-16L]

The T and R series motors do not have them. Do the A series?

Hi Rodger, the A series do have a rubber layer in the crank pulley. Upgrade pulleys for the 4AGZE and such don't tend to have the rubber layer though and don't suffer any detrimental side effects.

[Rodger]

Well there you go!

Now I'll also have to double check my 3S-G build also, I am throwing the pulley away anyway so it is just for future reference.

Regards

Rodger

[love ke70]

right, my bad on the oil pump front. anyone say i wasnt thinking?
id just rather run a harmonic balancer rather than an alloy pulley. its obviously done for a reason...

[Sam_Q]

alright thanks bill I think I will do just that,