Trying to install an Aluminum flywheel on my 12A - RX7Club.com



Trying to install an Aluminum flywheel on my 12A

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Old 03-16-17, 04:46 PM
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Trying to install an Aluminum flywheel on my 12A

I bought an Aluminum flywheels and been having problems with it. First the pressure plate didn't make contact with the clutch plate. I was told that this flywheel is made to fit two different pressure plates and I would have to make 0.315 spacers to move the friction plate up higher I did that and it fix the problem. After I did this and went to install the engine and now the pressure plate hits the bellhousing at the area of the starter. The spacers do not change the the location of the pressure plate so that is not why the pressure plate hits the bellhousing. So how do I get this to work? Do I need to grind out the bellhousing next to the starter? Do I need to take out the spacers and machine the mounting stand offs that hold the pressure plate. If I machine them off and if so will the torque arms on the pressure plate hit the towers (stand offs) that have a locating pin that isn't used on my set up.Is there a pressuer plate that has a lower profile or is smaller around. It needs to be around 3/8s of an inch lower to clear the bellhousing.This is for a 1984 RX 7.In the pictures I am pointing at he torque arm and you can see now the towers ( stands) hold the pressure plate uo of the flywheel. The next picture shows the etched number M5-5791. The counter weight can be seen in the next picture and in the last picture I am pointing to the area that the pressure plate hits the bellhousing. This is a spare trans but is the same trans that is in the car.
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Trying to install an Aluminum flywheel on my 12A-_3154774.jpg   Trying to install an Aluminum flywheel on my 12A-_3154775.jpg   Trying to install an Aluminum flywheel on my 12A-_3154776.jpg   Trying to install an Aluminum flywheel on my 12A-_3154770.jpg  
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Old 03-16-17, 11:18 PM
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215mm vs 225mm?
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Old 03-17-17, 09:02 PM
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I have the 225MM clutch. If I can buy a 215 mm pressuer plate I would think that would give the clearance need to fit. Can I run the 225 clutch with 215 pressure plate Or do I need to buy both clutch and pressure plate? Do you know if the two clutches have the same bolt pattern? Also can I use the same throughout bearing?

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Old 03-18-17, 10:39 AM
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If there are standoffs on the flywheel, it is meant for 225mm pressure plates. If the flywheel is flat faced, it is meant for 215mm pressure plates.

Likewise, locating dowels are only used on 225mm pressure plates. 215mm only used two shanked bolts to locate it to the flywheel.

Racing Beat (I think) used to make steel flywheels that were flat faced and you used thick spacers in order to use 225 pressure plates on them. This may be where your ".315 spacer" confusion lies.

Looking at your first image, it looks like you're trying to bolt a 215mm pressure plate to a 225mm flywheel. This clearly won't work

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Old 03-18-17, 11:32 AM
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Thanks for the post. So is the 225 MM pressuer plate a lower profile? What can I do to fix this. The problem is the pressure plate hits the bellhousing were the bellhousing dips in for the starter. Do I have to grind some clearance on the bell housing. The engine comes within about 1/8 inch of mating to the bellhousing. If it took out between 3/16s to 1/4 it should fit. Or is the a different pressue plate that would fix this?
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Old 03-18-17, 11:36 AM
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You should never have to modify the flywheel or the transmission.

The 225mm pressure plate has a significantly shallower profile. This is how I was able to quickly identify your pressure plate as a 215mm unit.

I don't have any images of a 225mm pressure plate but I do have a video, you can see that the pressure plate is practically flat-faced in comparison.


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Old 03-18-17, 11:42 AM
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215mm is practically flat-faced.
225mm has a much taller step-height.
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Old 03-18-17, 11:44 AM
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215mm is practically flat-faced.
225mm has a much taller step-height.

Flywheel, yes. Pressure plate, the opposite. On a 225 pressure plate the mounting flange is practically co-planar with the torque straps.

Regarding cross-pollination, I've twice successfully used 215mm disks in 225mm systems. I plan on doing it a third time with at least one of my RX-7s, both of them if I can't find a cheap 5.5" clutch setup for the 12A car.

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Old 03-18-17, 01:48 PM
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Oh, I see what you're saying. I'd need to walk out to the garage and examine both sizes to confirm of course but it is not a big deal.

Here's to hoping we didn't confuse the OP too much.
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Old 03-20-17, 06:19 PM
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I want to keep the Aluminum flywheel because it has been balanced with the rotors and E-shaft. I measured the fiction plate on the flywheel and it is 225 MM. the clutch disc and pressure plate measures 215 MM.I was hold because there was a gap between the pressure plate and clutch disc with the 215MM plate. I needed to make 0.315 spacers. So that fixed the gap problem but when I tried to install the engine to the Trans I found the pressure plate hit the inside of the bellhousing. So I hope that the 225 MM pressure plate has its friction plate that hang down lower so that the profile would sit lower on the flywheel. I would have to remove the 0.315 spacer and maybe this will end my frustrations
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Old 03-20-17, 06:23 PM
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i have a 215mm aluminum flywheel, lmk if you want to trade for your 225
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Old 03-20-17, 07:52 PM
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I want to keep the Aluminum flywheel because it has been balanced with the rotors and E-shaft. I measured the fiction plate on the flywheel and it is 225 MM. the clutch disc and pressure plate measures 215 MM.I was hold because there was a gap between the pressure plate and clutch disc with the 215MM plate. I needed to make 0.315 spacers. So that fixed the gap problem but when I tried to install the engine to the Trans I found the pressure plate hit the inside of the bellhousing. So I hope that the 225 MM pressure plate has its friction plate that hang down lower so that the profile would sit lower on the flywheel. I would have to remove the 0.315 spacer and maybe this will end my frustrations
You need a 225mm clutch pressure plate. Using the wrong pressure plate is an exercise in futility. You actually made a clutch disk spacer?

The flywheel should never be balanced to the assembly. You balance the counterweight. The flywheel is an expendable wear item.

As far as I know, ALL available flywheels nowadays are 225mm. That is the standard diameter from 1983 to 1992 and a 225 flywheel will work on a '82-earlier engine with the correct clutch and counterweight.

Personally I just want to use a 215 clutch for the lighter clutch disk. Have never had a problem with slippage, but lots of problems with synchronizers.

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Old 03-21-17, 06:18 PM
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When I bought the car it was a PRO 7 car so the engine was stock. It came with a cast iron flywheel and a 215 MM four puck clutch and pressure plate. I am going to order a 225MM four puck clutch and high proformance pressure plate.
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Old 03-22-17, 07:36 AM
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i have a brand new (older, but not ran) RB 4 puck clutch disk i'm not using, it is 225mm. if interested, shoot me a PM
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Old 03-22-17, 10:09 AM
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Doe's it have springs or is it without springs? How much?
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Old 03-22-17, 10:38 AM
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no springs, $70 shipped?
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Old 03-29-17, 07:06 PM
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I just received the 225 mm clutch and pressure plate and that fixes the problem I had. Hope that the next guy that is like me and doesn't have money will be able to know how to fix this problem.
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Old 03-29-17, 07:08 PM
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no springs, $70 shipped?
I had already ordered the parts. Sorry I hope you can sell it that's a great price.
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