capn

OK so

im looking at mazdatrixs' fly wheels andim a bit thrown off here it isnt a large one nut fly wheel, it seems it has it attached to the counterwieght.



i mean is the reliable? and or safer than the gigantor nut?

RotaryEvolution

iTrader: (30)

it looks as though it still uses a single large nut to hold the counterwieght in place but i have never seen a 2 piece flywheel like that, all the lightwight flywheels i have looked at were single piece technically speaking.

capn

well i mean the flywheel mashes the counterwieght on the eshaft, and here it sort of looks like it is bolted down by those six bolts, am i right to assume that or is it 6 bolts plus gigantor?

RotaryEvolution

iTrader: (30)

the counterweight looks as though it is mounted to the e-shaft with the 46mm nut then the flywheel is bolted to the counterweight with the 6 bolts.

capn

its 54mm

ddub

Thats just like all aftermarket flywheels, the counterweight is a separate piece. The counterweight bolts to the flywheel and then the flywheel/counterweight go onto the engine the same way it normally does with the stock flywheel nut.

capn

oh ok , so when i change the rear counter weight for the flywheel do i have to change the front?

ddub

No, the stock flywheel has the counterweight built in, and the one they provide (when you give them the year of your engine) will provide the proper counterweight to balance with the front.

RotaryEvolution

iTrader: (30)

no, it should be balanced unless it states you need a special front counterweight, which would be unusual unless it requires it for something like an all S5 conversion.

capn

ok gotcha thanks guys

RotaryResurrection

iTrader: (8)

IF you set out to make flywheels for the rx7, consider your options. IN a minute, you'll understand why this is the case.

Rotaries come with 2 diameters of flywheel, small (nonturbo) and large (turbo). But, every 2 or 3 years, they changed the weight of the internals and the balance of the flywheel itself to match. So, you have the option of making about 6 different flywheels in each diameter to suit every rotary out there, or you have the option to make only 2 flywheels, one in each diameter, and use the automatic counterweight that mazda already sells suited to each rotary engine by year/weight.

Also, it's much easier (and cheaper) to machine a flat flywheel, than it is to make a one piece flywheel with the more complex tapered hole/pad to mount on the e-shaft.