1G Flywheel step measure

[Adrian97]

What tools i can use to measure Flywheel step height? there is nobody in my area who can measure Flywheel step with dial indicator even machinist in my area does not know what is step height...
what do you think about this method ?

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[DSMPT]

What tools i can use to measure Flywheel step height? there is nobody in my area who can measure Flywheel step with dial indicator even machinist in my area does not know what is step height...
what do you think about this method ?

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You can't properly measure it with a caliper in hand.
If there is no machine shop that can properly do that for you, I recommend you to use an aluminum flywheel which has a replaceable friction plate, such as Fidanza.

 

[pauleyman]

I don’t know what you’re doing but that flywheel is not stepped. Stepped flywheels are used on the turbo cars. What do you have?

 

[DSMPT]

I think he has a 1g turbo. I guess the pic he attached is just for reference to show the method that he is talking about.

 

[motomattx]

Here you go:

http://www.roadraceengineering.com/clutchandflywheeltech.htm

 

[pauleyman]

Road race method works and notice the step is from the pressure plate mounting pads to the friction surface. The most direct method is with a depth mix. The flywheel in the ops original pic is a flat flywheel. The pressure plate mounts are the same height as the friction surface. Gonna guess this a euro 4g63 non turbo.

 

[Adrian97]

exactly pic is just method to show...

Yes, I know this page but it does not help me much
even digital caliper did not work properly ?
is something I could buy to measure it myself?
unfortunately here in europe, I can not find anyone who measures such things..

I have 1g GSX and ACT flywheel that needs to be resurfaced this time.

 

[motomattx]

You need a dial indicator, and a piece of flat plate with a hole in it for the indicator body to pass through, or an actual dial indicator holder would be much better.

 

[pauleyman]

As mentioned previously you need a depth mic. Every Machinist should know what this is if you mention it to them. If they don't you need to find a different Machinist.

 

[Kryndon]

Both the 1G and 2G N/A European DSMs have the flat style flywheel. The friction surface and the pressure plate mounting surfaces are parallel and at the same height/level. Step height is essentially the height difference between these two surfaces. On turbo flywheels, it's more important to get the correct step height (also based on aftermarket clutch specs).

On the N/A, because it is flat, your machinist needs to take off enough material so that both surfaces are completely flush with each other. This is much easier on the flat flywheels since you have a lot of material to work with. Just a slight pass on the surface would be enough to have them flush and shiny/clean. Personally I've taken my turbo flywheel to get machined and stepped properly, only to have the machinist take off too much material on the steps, so my step height is under the minimum limit, but it still works.

If you can't find a machinist that specifically does flywheels, look for a shop that rebuilds and machines cylinder heads. I'm sure they can set up their machine to run a flat mill/stone over the flywheel to get true flatness.

Also, since you've got a turbo GSX flywheel to be resurfaced, and since it's aftermarket (ACT), look on their website for the step height limits. It may be different than what the factory service manual calls for.

 

[donniekak]

Both the 1G and 2G N/A European DSMs have the flat style flywheel. The friction surface and the pressure plate mounting surfaces are parallel and at the same height/level. Step height is essentially the height difference between these two surfaces. On turbo flywheels, it's more important to get the correct step height (also based on aftermarket clutch specs).

On the N/A, because it is flat, your machinist needs to take off enough material so that both surfaces are completely flush with each other. This is much easier on the flat flywheels since you have a lot of material to work with. Just a slight pass on the surface would be enough to have them flush and shiny/clean. Personally I've taken my turbo flywheel to get machined and stepped properly, only to have the machinist take off too much material on the steps, so my step height is under the minimum limit, but it still works.

If you can't find a machinist that specifically does flywheels, look for a shop that rebuilds and machines cylinder heads. I'm sure they can set up their machine to run a flat mill/stone over the flywheel to get true flatness.

Also, since you've got a turbo GSX flywheel to be resurfaced, and since it's aftermarket (ACT), look on their website for the step height limits. It may be different than what the factory service manual calls for.

There is no way we could do a stepped flywheel in the machine we use to surface blocks/heads. You need a surface grinder. We have a flywheel specific machine we use.

 

[Adrian97]

I found a machinist that specifically does flywheels but they dont have tools to measure step height on my flywheel so what I can do is buy depth mic and take the flywheel with depth mic to machinist, resufaced and then measure with depth mic.

 

[Adrian97]

do u think flywheel resurfaced its necessarily ?
flywheel is new, has gone 200-500km.
btw. (its not mine flywheel).