CONFIRMED L28 with RB25 Flywheel and 350Z Clutch

[83turbo280zx]

This is the original thread on hybridz.org

http://forums.hybridz.org/topic/124844-confirmed-l28-with-rb25-flywheel-and-350z-clutch/?p=1167280

Sparknotes, I had a machine shop fabricate some spacers to adapt a RB25/RB26 flywheel to a L series. I know for sure the crank size is the same from 70-83 on the L series inline 6's. I would imagine the 4 cylinder versions are the same, but without having one to measure myself, I cannot prove. So if someone can possibly provide that information, that would be greatly appreciated.

I'm hoping this will also transfer over to people building the 4 cylinders and gain some interest there as well.

The basic premise of it, is the back of the L crank is 80mm, the back of a RB crank is 81mm, so there is a 1mm difference that needs to be accounted for. The flywheel bolts will not hold it, they will eventually shear as they are not designed to take the load.

So the spacer I have designed will fix this and allow you to bolt on a RB flywheel, and use a 350z clutch.

We used a XTD brand clutch, which the pressure plate seems to be thicker than some of your name brand clutches, so it rubbed the bell housing. We are using a 280zx transmission (FS571W- B), I have not clearance tested a T5 bell housing yet, but I will very shortly and update the thread.

Other members on hybridz.org have used Exedy, Clutchmasters, with no rubbing problems, so I'm hoping it is just isolated to XTD brands.

The lightweight RB flywheel is significantly cheaper than a Fidanza flywheel for the L series.

Fidanza - $330~  *240mm surface
XTD Rb flywheel - $162  *250mm surface (If 350z clutch is used)

You can opt to use a 350z clutch if you want to take advantage of the extra surface area and extra clamping force

Or if you want to stick with your turbo clutch, you can still use a turbo (240mm) clutch, the only difference obviously is the surface area used on the flywheel. But i did confirm a 240mm pressure plate WILL in fact slide on the dowel pins and bolt up to the RB flywheel. This is great if you just want a light weight flywheel but already have a performance turbo clutch, or want to keep the stock clutch, you can bolt it to the 250mm flywheel and only use 240mm of surface area.

This spacer is $30 shipped anywhere in the Continental US. I will ship international, it will just cost more.

Anyone interested please e-mail me @ sk84life1122@sbcglobal.net

I had a very limited run made by the machine shop, so if I run out, I will have to have another order made, which will usually take 2 weeks or so.

Pictures of the bell housing areas are provided in the hybridz.org link above, measurements will be provided in the coming weeks as I have a transmission to pull back out to install this spacer, so I will take more pics and post them then.

Pics of the spacer

[flatcat19]

Interesting.

[datzenmike]

The L20B/Z20/Z22/Z24/KA engines are all 6 bolt and will take an L series six cylinder flywheel.

Best 4 cylinder combo is a D21 240mm flywheel with a 300zx turbo clutch on it. I think 21 pounds for the flywheel.


How will you bolt a 240mm or a 225mm pressure plate to a 250mm RB flywheel??????? Or are you suggesting mismatching the clutch disc diameters?

 

[83turbo280zx]

The L20B/Z20/Z22/Z24/KA engines are all 6 bolt and will take an L series six cylinder flywheel.

 

Best 4 cylinder combo is a D21 240mm flywheel with a 300zx turbo clutch on it. I think 21 pounds for the flywheel.

 

 

How will you bolt a 240mm or a 225mm pressure plate to a 250mm RB flywheel??????? Or are you suggesting mismatching the clutch disc diameters?

 

 

 

 

You know I may be actually talking out of my ass lol. I can't prove that one for sure, but give me about a week and I will take a stock 240mm pressure plate and see if it will bolt up to the 250mm flywheel. I just assumed the bolt pattern and spacing was still the same, which it probably is, but as far as physical measurements, may be a tad bigger.

 

If i find that the 240mm and 225mm will not bolt up, I will strike that from the above post to avoid misinformation

[datzenmike]

The L and Z series flywheels come in 200mm, 225mm and 240mm. PP and clutch disc diameters and the bolt patterns are what defines what pressure plate will fit. 

[83turbo280zx]

The L and Z series flywheels come in 200mm, 225mm and 240mm. PP and clutch disc diameters and the bolt patterns are what defines what pressure plate will fit. 

 

Ok I confirmed today a 240mm clutch plate will line up with the dowels and bolt to the RB flywheel.

 

So if you wish to use a 240mm stock or performance clutch rather than the 350z clutch, you can do it.

[83turbo280zx]

I haven't tried a 225mm pressure plate, think I will order one just to see if it will bolt up, but i'm thinking it won't.

[jeph]

im currently running a nissan d21 truck flywheel with a act 350z 250mm clutch kit and it all fit perfect and works great.

 

i was recently using a d21 truck flywheel with nissan 300zx turbo exedy clutch kit all brand new and it did not hold over 200ft lbs of torque.