New Zealand Datsun Club

My engine builder thinks my flywheel is too heavy. I was 13kg and I have already had 4kg taken off it 2 years ago making it 9kg now but he thinks it needs more which I agree with but as I am already a short person I cant really afford to have anymore cut off my legs when it flys to bits from being too weak. What are your guys thoughts and has anyone taken more than the amount I have done already and does anyone now if they are a weakfish or strong flywheel. Ideally id love to put a tilton or quarter master 7.25'' but it isn't happening this time round so thoughts would be great.

cheers
Craig

Be careful taking anymore off. All the strength is in tHe casting

Get someone to make you a steel one. I'd offer if I had the spare time.
Stronger than cast iron. Make it so the friction face will suit a tilton plate for later on.

nzdatman wrote:Get someone to make you a steel one. I'd offer if I had the spare time.
Stronger than cast iron.

What would a rough price be on making one if I was to get one made? A tilton Button/flywheel are cheap as chips and there is one to fit an L series but I am not fussed on a twin plate clutch setup and a hyd throw out bearing as yet.

You can use an RB one if you get a 1mm shim made for around the spigot. I used one pretty much the same as this (the 2nd picture) on the 26 so they can hold up to 8,000rpm and a bit of abuse. He says they're about 6Kgs. You'd have to get it redrilled for a 225mm clutch if that's what you're using.

http://www.trademe.co.nz/motors/car-par ... 425822.htm

went back to the machine shop that originally machined my flywheel and they are not keen to take any more off it as they said they are not the strongest anyway so im leaving it for now and will eventually change to a quartermaster or tilton 7.25'' twin or triple plate setup so thanks all for your input but im keen to keep my legs and loose a small fraction of power.

I don't think you'll power as such will you? Just a little bit of acceleration? Not really 100% sure on that one.
To machine a one off steel flywheel, reusing the original ring gear, I would allow around $600 off the top of my head. Those rb ones for $350 seem dirt cheap, probably making them in low volume production and getting some good economy that way. Once you've done one and got the program written you could bang them out a lot quicker.
What are the Tilton sit-ups worth?

nzdatman wrote:I don't think you'll power as such will you? Just a little bit of acceleration? Not really 100% sure on that one.

My very limited (and probably wrong) understanding from limited reading:

Heavier Flywheel = maintains more momentum especially through vertical travel aka going up hill etc and hopping off the accelerator through to lurching ground clearance etc

Lightened flywheel is the converse. Better acceleration but you lose momentum through power and weight shifts.

Something like that. I am sure somebody here can correct me.