Flywheel Machining

[peterd]

Can someone tell me the right amount of weight drop off a flywheel so that it's still a practical car to drive around the city?

I was told that if I lose too much weight, the car will be a bit difficult to get moving.

thanks

Edited October 9, 2014 by peterd

[Mechanical Sympathy]

I don't think it's so much of an issue if you're machining *some weight from a standard flywheel.

 

For example, a Toyota 2TC engine has a flywheel that weighs around 11kg, whereas a 2TG flywheel weighs around 8kg.

 

Both factory flywheels, same bottom end, with no real adverse effects despite the 2TG flywheel being 30% lighter.

 

I think it's when you start getting down to aftermarket aluminium flyhwheels that weigh 3-4kg that driveability problems arise - and you won't machine that much from a standard flywheel

[peterd]

thanks for the quick reply. makes sense.

I should have mentioned it's for a k40 box but I'm sure the general theory works for everything.

 

(I must learn how to spell "machining" too)

Edited September 12, 2014 by peterd

[Mechanical Sympathy]

Even K engine flywheels got heavier over time as displacement increased and the engines went from powering rorty little lightweight hardtops to more mundane nun cars and work vans.

[filfrederick]

just make sure that it is at least 10mm thick everywhere and make sure all the corners are nice smooth radius's so there is no sharp corners to encourage cracking.

you will also need to get it re-balanced after machining.

 

i went as light as i could and also took a few kg out of the crank and it was still OK to drive around every day. a little tricky on hill starts but you get used to it.