The real benefits of lightweight pulleys (quantified)

[humfrz]

Originally Posted by mrg666

We cannot neglect the rotating components after transmission since whp is what we are trying to gain. Saving weight from the crank pulley has negligible effect on power compared to all those connected to the crank shaft when it is engaged to wheels. Shown in independent tests, light crank pulley has no effect on whp of our cars. I agree with you though that there might be some power gain if flywheel, transmission shaft, wheels, tires, and rotors are also lightened. Regarding accessory pulleys, I wouldn't touch water pump since engine cooling is more important than 1-2 HP gain, AC pulley is not engaged unless AC is on, alternator pulley might help but the gain is not worth the trouble. I am not reiterating (@humfrz is annoyed when I repeat myself) the vibration damping part of discussion. Enjoy driving your car!

Oh, not annoyed, just concerned. Short term memory loss can sneak up on you

Now, what were we talken about ?


humfrz

[humfrz]

Originally Posted by NoHaveMSG

Or crawling inside of it in the dead of summer to fix a clog.

I have replaced so many flywheel bolts on a baler in the heat I get woozy thinking about it.

You have been there

Yep, sitting on the tractor, when you notice a extra large clump of hay going into the bailer and just know it's gonna choke on it. BAM, the sheer bolt on the flywheel snaps. OK, get in there and pull the clog out of the bailer with your bare hands.

Then, replace the sheer bolt - NOT WITH A CASE HARDENED BOLT!

(I've told that story before)


humfrz

[mrg666]

Originally Posted by humfrz

Now, what were we talken about ?


humfrz

I think we were talking about crank

[humfrz]

Originally Posted by FRS Justin

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

Yep, back in those days, on the farm, there were two kinds of kids, the quick, and the ones missing body parts.

I remember my grandfather setting me up on a couple sacks of grain near the big drive pulley on the engine (he was babysitting). I had lots of fun catching grasshoppers and placing them on the drive belt as it returned to the engine. The fun was to try to guess whether or not the grasshopper would jump off the belt before it got squashed by the drive pulley.

About twice a day, my grandfather would have to shut down the machine and scrape all the dead grasshopper carcasses off the flywheel - because they were making it heavy and slowing down the machine -


humfrz

[nikitopo]

Originally Posted by FRS Justin

Yes for mpg purposes lightened internals help but at a cost. The inertia is lost and performance suffers greatly at the bottom end.

You are the only here with a point and without a childish response and yes performance could suffer in this area. Nevertheless, the FA20 engine has a strong torque at low rpm's and I don't feel my car to have an issue. In fact, after installing a lightweight flywheel and a 3 puck clutch it launches much better than before and with an immediate bite.

[NoHaveMSG]

Originally Posted by nikitopo

You are the only here with a point and without a childish response and yes performance could suffer in this area. Nevertheless, the FA20 engine has a strong torque at low rpm's and I don't feel my car to have an issue. In fact, after installing a lightweight flywheel and a 3 puck clutch it launches much better than before and with an immediate bite.

You are still posting suspect info to support your claims. We are talking about lightweight pulleys. I will say again, the dyno for the kit you posted has an under driven alt pulley.

http://www.toda-racing.co.jp/en/prod...lley-fa20.html

Developed to give lighter and sportier engine characteristic. By reducing the overall weight (and inertia) of the pulleys, and by modifying the alternator pulley ratio to take advantage of the more sporty use, the burden on the engine is reduced helping to improve acceleration performance.

I still don't believe those claims until I see a 3rd party dyno.

[NoHaveMSG]

Originally Posted by humfrz

You have been there

Yep, sitting on the tractor, when you notice a extra large clump of hay going into the bailer and just know it's gonna choke on it. BAM, the sheer bolt on the flywheel snaps. OK, get in there and pull the clog out of the bailer with your bare hands.

Then, replace the sheer bolt - NOT WITH A CASE HARDENED BOLT!

(I've told that story before)


humfrz

I didn't get to sit on the tractor. I usually jogged ahead with a pitchfork trying to spread out the clumps in the winrows before it happened. Wasn't always successful

[mrg666]

Originally Posted by NoHaveMSG

You are still posting suspect info to support your claims. We are talking about lightweight pulleys. I will say again, the dyno for the kit you posted has an under driven alt pulley.

http://www.toda-racing.co.jp/en/prod...lley-fa20.html



I still don't believe those claims until I see a 3rd party dyno.

I posted the third party dyno results earlier. There is no HP gain.

Edit: Here you go
https://motoiq.com/fluidampr-the-independent-test/3/

[nikitopo]

Originally Posted by NoHaveMSG

You are still posting suspect info to support your claims. We are talking about lightweight pulleys. I will say again, the dyno for the kit you posted has an under driven alt pulley.

http://www.toda-racing.co.jp/en/prod...lley-fa20.html

They under-drive only the alternator and this gives a max. of 1hp gain. It is a supplementary change and not the basic change. If you don't trust them it is your problem. I am not a representative of them here nor a seller.

Originally Posted by mrg666

I posted the third party dyno results earlier. There is no HP gain.

Edit: Here you go
https://motoiq.com/fluidampr-the-independent-test/3/

I'll say it again and for the last time. If you do a dyno on 5th gear you won't see any gains. I mentioned this already many times. The rate of the rpm increase is much slower and you'll lose all the advantage of the lighter rotating mass.

[humfrz]

Originally Posted by NoHaveMSG

I didn't get to sit on the tractor. I usually jogged ahead with a pitchfork trying to spread out the clumps in the winrows before it happened. Wasn't always successful

So, did you get blamed for the baler jams ?

In my younger days, we had our hay custom baled. After digging out Canadian thistle in the field where the first few bails were spit out, I learned to burn the first few bales that came out of a custom baler ..

When I was a teen ager, I decided to go into business for myself, baling hay. So I bought a $200 hay baler. Oh, yes, I soon found out why it sold for so cheap - the twine tying fingers were wore out. So much for the profits the first year -


humfrz

[NoHaveMSG]

Originally Posted by humfrz

So, did you get blamed for the baler jams ?

In my younger days, we had our hay custom baled. After digging out Canadian thistle in the field where the first few bails were spit out, I learned to burn the first few bales that came out of a custom baler ..

When I was a teen ager, I decided to go into business for myself, baling hay. So I bought a $200 hay baler. Oh, yes, I soon found out why it sold for so cheap - the twine tying fingers were wore out. So much for the profits the first year -


humfrz

No, the guys that initially raked the winrows with the tractors got the blame. They would go too fast and it would bunch it up into clumps. We could only do so much running out front trying to fix it.

[Somerandom18]

Should get the Fluidamper for engine protection not phat gainz.. Was the first mod I did to this car since I plan on keeping it until the wheels fall off.

Sent from my Pixel XL using Tapatalk

[humfrz]

Originally Posted by NoHaveMSG

No, the guys that initially raked the winrows with the tractors got the blame. They would go too fast and it would bunch it up into clumps. We could only do so much running out front trying to fix it.

There is a clump coming up - now, where did that kid go


humfrz

[humfrz]

I'm sorry, I'll leave the thread alone now -


humfrz