L20b / Z22 Flywheeel interchange?

[Jester]

I have been holding on to this dang L20B flywheel for quite a while. It was in the back of one of my old parts trucks. Forgot how damn heavy it was. A couple weeks ago I picked up a Z22S with the flywheel. Didn't even think about the weight. Now last night I'm over at NKL DYM's and he offers we a freshly rebuilt L20B for my wagon. Mentioned I would just need the flywheel for L20. NO PROBLEM, I HAVE ONE. I dig out this old rusty L flywheel AND I grab the Z flywheel. HOLY CRAP.....WHAT A DIFFERENCE IN WEIGHT!!!!

Check this out.

 

 

 

Now the L20 has three alignment pins in it

 

 

And the Z22 only has a place for two. One is gone and the other is broken off.

 

 

I am thinking of using the Z22 flywheel behind the L20 with the Z22 truck clutch. Any one see a reason this wouldn't work after I have it balanced?

[Farmer Joe]

shouldnt be a problem at all.

 

i have a 84 z24 flywheel on my 77 l20b.

 

i went right to the z24 flywheel from an auto trans, so i dont know if theres any difference for the driveablility.

 

other than that, i think you should be able to use the 240 mm nissan clutch now. use the clutch and PP from the truck the flywheel came from..

 

good luck man!

[Jester]

I'll have to put them on the scale and see how much they weight in at. The difference is pretty crazy.

[wayno]

I also am using the Z24(240mm) flywheel behind my LZ23, never checked to see if there was a differance, giant clutch disc, thats all I cared about.

[Jester]

Cool. Sounds like I may see if that free 5 speed works or not while I'm at it. lol

[Sealik]

I'll have to put them on the scale and see how much they weight in at. The difference is pretty crazy.

 

 

21 lbs

 

Post 195+

http://community.ratsun.net/topic/25497-sealiks-shit/page__st__180

 

:D

[datzenmike]

Yup the ones with the scalloped back are about 21 lbs and 29 for the other. I had a 225mm from a 280zx and the extra weight isn't needed because the crank is longer with more mass. The Z24 one is also lighter.

[Jester]

Thanks for the link. I have a lot of reading to do now. :D

[Yrag]

I have been holding on to this dang L20B flywheel for quite a while. It was in the back of one of my old parts trucks. Forgot how damn heavy it was. A couple weeks ago I picked up a Z22S with the flywheel. Didn't even think about the weight. Now last night I'm over at NKL DYM's and he offers we a freshly rebuilt L20B for my wagon. Mentioned I would just need the flywheel for L20. NO PROBLEM, I HAVE ONE. I dig out this old rusty L flywheel AND I grab the Z flywheel. HOLY CRAP.....WHAT A DIFFERENCE IN WEIGHT!!!!

Check this out.

 

 

 

Now the L20 has three alignment pins in it

 

 

And the Z22 only has a place for two. One is gone and the other is broken off.

 

 

I am thinking of using the Z22 flywheel behind the L20 with the Z22 truck clutch. Any one see a reason this wouldn't work after I have it balanced?

[Yrag]

If all specs measure the same you should be fine. I machined down a L20 flywheel to less than half its weight once. It was for a circle track car running alcohol. It alows the engine to rev up much faster but you will loose torque.

[datzenmike]

If the engine side is scalloped like this it weighs about 21pounds. If it's flat across the back it's about 29 pounds. A heavy vehicle like a truck with a small L20B motor would likely have the heavier 29 pound one for storing rotating energy for take offs. Cars specially with 6 cylinders or larger Z22/24 motors might have the lighter ones.

 

 

It will work perfectly. If you were using the truck for hauling heavy loads you might notice having to rev and slip the clutch a bit more. What size clutch? 225?

[Jester]

This would be going into my wagon.

 

Looks like 9 1/1" across the face.