The real benefits of lightweight pulleys (quantified)

[Ultramaroon]

Originally Posted by humfrz

I remember back-in-the-day, when I was a child, I tried to convince my grandpa that if he let me drill holes in the arms of that drive pully on the steam engine, it would be lighter and spin faster, thus allow the thrashing machine to run faster and we could get done thrashing sooner.

He told me to go back up to the farmhouse and bring back another jug of iced tea -


humfrz

Grandpa was a smart man.

[Tcoat]

Originally Posted by humfrz

I remember back-in-the-day, when I was a child, I tried to convince my grandpa that if he let me drill holes in the arms of that drive pully on the steam engine, it would be lighter and spin faster, thus allow the thrashing machine to run faster and we could get done thrashing sooner.

He told me to go back up to the farmhouse and bring back another jug of iced tea -


humfrz

Would probably have 3 or 4 holes done by now.

[mrg666]

We are discussing crank pulley like it is the only rotating part connected to the crankshaft. The other side of the crank shaft is connected to the flywheel (or flexplate for AT) which is connected to transmission, transmission shaft, differential, two wheels, two tires, and two brake rotors, right? We have been talking about merely the crank pulley on one end of the crankshaft.

[humfrz]

Speaking of pulleys, can you imagine kids today being allowed to be around machines like this


humfrz

[humfrz]

Originally Posted by mrg666

We are discussing crank pulley like it is the only rotating part connected to the crankshaft. The other side of the crank shaft is connected to the flywheel (or flexplate for AT) which is connected to transmission, transmission shaft, differential, two wheels, two tires, and two brake rotors, right? We have been talking about merely the crank pulley on one end of the crankshaft.

I think you're a bit late to the party, there, mgr666


humfrz

[nikitopo]

Originally Posted by Ultramaroon

Nah. People either get it or they don't want to because they're emotionally attached to justifying their purchases. I got far enough to confirm my suspicion but got bored with my little paper. I should finish it.

Personally, I'm not emotionally attached with my purchases. I tried a few things among the years and some of them are now in the dustbin. The level of this car is very high from the factory and many times it is not easy to have even a small improvement without a compromise. The thing about the pulley topic is just that it is a popular discussion across all the car forums. Different people want to show they are experts and knowledgable on things they cannot really understand and in general to show off. Funny thing is that noone from these people will post any before and after results either on a dyno or with logging to confirm that gains are zero or not. So, it is a discussion just for the discussion ...

[mrg666]

Originally Posted by humfrz

I think you're a bit late to the party, there, mgr666


humfrz

No beer left for me ?

[FRS Justin]

Originally Posted by humfrz

Speaking of pulleys, can you imagine kids today being allowed to be around machines like this


humfrz

ya im sure a few arms would be missing if they played with that monster.


Hey I will let you try my vape if you put your finger here... smh

[FRS Justin]

I personally just love this forum because you never know where the topics will end up lmao

[humfrz]

Originally Posted by mrg666

No beer left for me ?

Nope, you're cut off. Why? Because you're starten to repeat yourself - repeating others is OK - but, not yourself.

OK, maybe one for the road


humfrz

[tomm.brz]

Originally Posted by nikitopo

Personally, I'm not emotionally attached with my purchases. I tried a few things among the years and some of them are now in the dustbin. The level of this car is very high from the factory and many times it is not easy to have even a small improvement without a compromise. The thing about the pulley topic is just that it is a popular discussion across all the car forums. Different people want to show they are experts and knowledgable on things they cannot really understand and in general to show off. Funny thing is that noone from these people will post any before and after results either on a dyno or with logging to confirm that gains are zero or not. So, it is a discussion just for the discussion ...

Starting with you

When do you dyno your car to prove you have gains from pulley?

[nikitopo]

Originally Posted by tomm.brz

Starting with you

When do you dyno your car to prove you have gains from pulley?

Are you blind? I provided dyno numbers some pages ago. There was another dyno plot at Nasioc with the same gains, but I cannot find it right now. I also did some acceleration measurements and my car was checked by a local tuner too, but not just with the pulley kit modification. Too many changes to have a before and after image for everything.

So, stop reading too much the internet and find a local tuner and work with him on your targets. Some prefer lightweight mods and to stay NA, others prefer to go FI from day one. We live in a free world and thankfully there are different options.

[nikitopo]

Originally Posted by mrg666

We are discussing crank pulley like it is the only rotating part connected to the crankshaft. The other side of the crank shaft is connected to the flywheel (or flexplate for AT) which is connected to transmission, transmission shaft, differential, two wheels, two tires, and two brake rotors, right? We have been talking about merely the crank pulley on one end of the crankshaft.

Only front pulleys and flywheel are BEFORE the transmission and the gearing. Engine rotating internals are also constantly changed and get lightweight and with less friction by manufacturers to increase fuel efficiency and get better response. Are they dumb too on saving a few hundredth or even tenth of grams from these parts? You can focus also on other rotating parts after the transmission, but they won't have the same advantage.


Anyway, got to go. Too many posts for this week and reached the limit of my quotas

[steve99]

Originally Posted by humfrz

Speaking of pulleys, can you imagine kids today being allowed to be around machines like this


humfrz

Just imagine the Health and Safety inspector seeing that contraption, have heart failure.


Or imagine the number or warning signs required


Beware of rotating parts
Do not put hand in machine
Keep long hair tied back
Warning high noise levels
Eye and hearing protection must be worn
Warning machine may start automaticly
Beware of belts
Do not allow children to play in area
Do not enter feed area if machine operating

Contact with rotating or moving parts may be hazardous
Beware of material being ejected from machine when in operation

......
......


No common sense these days