70 Datsun 521 newbie

[Greaser2]

It is very stiff, it will likely break something at the pedal connection.   

[d.p]

Look in my thread for the one I got.  Roadster 200mm heavy duty 650kg clutch.  Haven’t installed it yet but comes highly recommended.  
 

Going on an L20b and 79 ZX 5 speed.  

[d.p]

F it here it is: https://www.ebay.com/itm/Datsun-Roadster-Exedy-Clutch-Kit-w-HD-600kg-Cover-fits-1600-2000-PL-510-521-620-/233202857988?_trksid=p2349624.m46890.l49292

[datzenmike]

Well it should be OK to use in the 2+2 and the 280zx. The only difference is your clutch master and slave and the mechanical advantage of your clutch pedal..

[Greaser2]

1 hour ago, d.p said:

Look in my thread for the one I got.  Roadster 200mm heavy duty 650kg clutch.  Haven’t installed it yet but comes highly recommended.  
 

Going on an L20b and 79 ZX 5 speed.  

So you have a Roadster 200mm flywheel?

[Greaser2]

1 hour ago, datzenmike said:

Well it should be OK to use in the 2+2 and the 280zx. The only difference is your clutch master and slave and the mechanical advantage of your clutch pedal..

Yes, looking at what the master/slave setup is on the 2+2. 

[datzenmike]

The 521 is 5/8" I couldn't find what the master is on the zx.

 

There is also the mechanical leverage of the pedal.

[Greaser2]

1 hour ago, datzenmike said:

The 521 is 5/8" I couldn't find what the master is on the zx.

 

There is also the mechanical leverage of the pedal.

5/8 as well.  The slave is 3/4.  I currently have a 11/16 slave. 

[d.p]

I have a 6 bolt 200mm flywheel off an L20b out of a 610 IIRC.  So no not a roadster but the same size.  

Edited November 23, 2020 by d.p

[Greaser2]

So a 3/4 slave for the 280z fits perfectly on the dogleg. The pedal is significantly softer now, surprised how much of a difference 1/16 makes.  

[mrbigtanker]

On 11/23/2020 at 5:22 AM, d.p said:

I have a 6 bolt 200mm flywheel off an L20b out of a 610 IIRC.  So no not a roadster but the same size.  

Bozo the L20B is a 6 bolt and L18/16 are 5 bolt.

[d.p]

8 hours ago, mrbigtanker said:

Bozo the L20B is a 6 bolt and L18/16 are 5 bolt.

Ok? Greaser has an L20b in his truck and I have an L20b on a stand with 6 bolt flywheel.  Bozo. 

Edited December 2, 2020 by d.p

[mainer311]

Bozosoku?

Edited December 2, 2020 by mainer311

[banzai510(hainz)]

simple to remember   applies t L20 motors

L20 in cars  200mm

L20b in trucks 225 mm   both 6 bolt   trucks needed a heavier flywheel to help get it going. the stored energy mass

[d.p]

Lol tanker in here trying to drop knowledge and getting his ass paddled over it.  

 

 

 

[mainer311]

44 minutes ago, banzai510(hainz) said:

simple to remember   applies t L20 motors

L20 in cars  200mm

L20b in trucks 225 mm   both 6 bolt   trucks needed a heavier flywheel to help get it going. the stored energy mass

 

You sure the flywheel is heavier? The 200 and 225 was only the clutch diameter, but the OD of the flywheel is the same.

[datzenmike]

But the engine side is scalloped on the lighter wheels.

I think these are 240mm but also have a 225 from a z car and from a truck that look like this. Left is about 21 pounds and the right is about 29 pounds.....

[mrbigtanker]

46 minutes ago, d.p said:

Lol tanker in here trying to drop knowledge and getting his ass paddled over it.  

 

 

 

You don't see me with a thousand questions on heredo you ? And no I don't pay everyone to work on my truck. Can you just finish it already it really is simple.Well maybe not for you.

[mainer311]

[mainer311]

53 minutes ago, datzenmike said:

But the engine side is scalloped on the lighter wheels.

I think these are 240mm but also have a 225 from a z car and from a truck that look like this. Left is about 21 pounds and the right is about 29 pounds.....

 

Hmmm, now I gotta take a look at the one that I got with my short block. I wanted to lighten it a little bit, but it may already be the lighter one.

[banzai510(hainz)]

we all learn something new sometimes.  No big deal.   AI LEARNED THERE IS A 5 BOLT TRUCK FLYWHEEL THAT IS A 225MM but is rare and not really brought up.

 

 

Mainer I got a 5 bolt that lighten to like 11pounds but I was scared to run . Thats why people use the Aluminum forged ones . The cast stock ones could get a crack and then go thru the trans tunnel and cut your legs off.  I would give it away but don't want liablility issues. The guy who sold it to me said it was fine then I read on here you have to be careful.

Edited December 2, 2020 by banzai510(hainz)

[datzenmike]

 

 

1 hour ago, banzai510(hainz) said:

we all learn something new sometimes.  No big deal.   AI LEARNED THERE IS A 5 BOLT TRUCK FLYWHEEL THAT IS A 225MM but is rare and not really brought up.

 

 

Mainer I got a 5 bolt that lighten to like 11pounds but I was scared to run . Thats why people use the Aluminum forged ones . The cast stock ones could get a crack and then go thru the trans tunnel and cut your legs off.  I would give it away but don't want liablility issues. The guy who sold it to me said it was fine then I read on here you have to be careful. 

 

Happened to Don Garlits. Took away part of his foot. One of the reasons he pioneered the driver in the front of the engine AA/F 'cars'.

 

The one year only '74 620 with the L18 engine was 5 bolt and 225mm PP

 

12310-B7900 superseded to 12310-11W00

 

You can turn a regular L series down on a lathe to these dimensions. Round all corners and have balanced.

 

 

There's a reason flywheels are the weight they are. It's to store kinetic energy used to get a heavy car going from a stop. Once moving it's of no use at all and absorbs engine power when accelerating that extra weight. Racing would be fine for almost no flywheel at all. Stop and go street car? Well if you like revving and slipping the clutch. I'm guessing my L20B is a 21 pound unit. I wouldn't go below 15. There's always someone that has a 9 pound aluminum wheel and claims he has no problem driving it. Just like loud exhaust... it's fine for some but gets tiresome really quick for others. 

 

[banzai510(hainz)]

I have a 10pound alum and its fine. I didn't notice a HUGE improvement but got it used for 100$

[njp.18]

On 5/31/2019 at 8:48 AM, Greaser2 said:

So, while waiting on wheels, finished up my steering wheel. My steering wheel was too far gone so decided to go with a Grant wood wheel. The Grant 4591 adapter fits great but leave a 1” gap so no horn or turn cancel. I found a 3.25” Dia. x 1.25” long 6061 aluminum stock for a spacer for $20 shipped . I used a exacto knife to carefully cut the glue holding the copper ring on the grant hub adapter. Took the aluminum to a local machine shop and had a recess milled in each end, one for the copper ring and the other end for the hub adapter. Then the center has milled out for $50. 

I then added 5 holes to the spacer, one for the horn wire, two for pins to cancel the turn signal and two I tapped for a screw to mount the adapter. 

painted the out edge, assembled everything on the column. 

Pretty happy, no gap and the horn and turn cancel work. 

why does the gap cause the horn and turn cancel not to work?

[DanielC]

The horn relay grounds through the steering shaft.  With a gap,no ground.

The pins have to flip a cam on the turn signal switch to cancel the turn signal.  With a gap, the pins do not reach far enough to flip the cam that cancels the switch.