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Cam Gears

monga

By monga,
in Engines & Forced Induction

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Batfink Rookie

Batfink

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obviously lighter cam gears would be better, hey? less rotating mass, and all that. Means less torque, but better revability, ive been told. Thats flywheels, anyway. Does it matter much with cams?

I always thought that lightend flywheels make no difference to power and torque? :D

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qikstagea Mentor

qikstagea

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Posted (edited)

A lightened drivetrain wil rev more freely, meaning basically that you will speed up quickly. Imagine spinning a light bicycle wheel, campared to spinning a heavy car wheel. The light wheel is easier to get up to speed, but has less momentum, so wont spin for as long, provided the resistance and friction was the same as the heavier car wheel. Hence the lightened flywheel, and carbon driveshafts, lightweight racing wheels etc.

Less weight will give you better acelleration, but you lose torque, because there is less momentum in the engine, and in some cases youll actually perform less ie slowing down when you come to a hill, due to reduced inertia in the rotating mass of your engine. all physics, dude.

I didnt think something so small as a cam gear would matter much though...

Edited by qikstagea
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otto Collaborator

otto

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Posted (edited)
A lightened drivetrain wil rev more freely, meaning basically that you will speed up quickly. Imagine spinning a light bicycle wheel, campared to spinning a heavy car wheel. The light wheel is easier to get up to speed, but has less momentum, so wont spin for as long, provided the resistance and friction was the same as the heavier car wheel. Hence the lightened flywheel, and carbon driveshafts, lightweight racing wheels etc.

Less weight will give you better acelleration, but you lose torque, because there is less momentum in the engine, and in some cases youll actually perform less ie slowing down when you come to a hill, due to reduced inertia in the rotating mass of your engine. all physics, dude.

I didnt think something so small as a cam gear would matter much though...

KEWL so seeing as power is the rate at which you do work ie torquexrpm(laymans terms i know multiplying rpm by torque wont give you kw) and adding heavyer stuff to the rotating mass gives me more torque(apparently according to you) howmuch extra torque and power do you think i will get from adding an extra 20kgs to my flywheel??

Did you ever consider the losses involved in getting the rotating mass to turn adding weight to the rotating mass does nothing for the engines output torque or power just makes the enging take longer and more force to wind down which i quess can be considered torque but not the torque we are interested in...i think thats enough torque on talk or was it the other was around.

Edited by otto
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Topaz Grand Master

Topaz

Posted
Posted

Also, I don't know the difference but the HKS ones are made of Duralumin and Nickel whereas the Tomei's are 100% Duralumin.

EDIT: just did a quick search and Nickel is actually stronger than Duralumin on the 'Vickers Hardness' test. 638MPa compared with 450MPa respectively.

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