Z24 block with KA head

[datzenmike]

 Actually the Release bearing collar for the Z24 is also the same used on the KA24E so you could get a KA24E pressure plate which has slightly more clamping force than the Z24 one. 450 vs. 400 Kg

[Socalman]

49 minutes ago, datzenmike said:

 Actually the Release bearing collar for the Z24 is also the same used on the KA24E so you could get a KA24E pressure plate which has slightly more clamping force than the Z24 one. 450 vs. 400 Kg

What year and model vehicle would I need to look up?

[Socalman]

Just now, Socalman said:

What year and model vehicle would I need to look up?

Those parts stores online or in person need to know. 😂 

[Stoffregen Motorsports]

On 4/4/2024 at 3:59 PM, Socalman said:

Not sure about the head, someone engraved over numbers 

I can't tell what that says, but we never use electric pencil to write on engine blocks when I was at Rebello. If anything, we used stamps, but we didn't generally label the motors we built.

Edited April 6 by Stoffregen Motorsports

[datzenmike]

On 4/4/2024 at 7:29 PM, datzenmike said:

 Actually the Release bearing collar for the Z24 is also the same used on the KA24E so you could get a KA24E pressure plate which has slightly more clamping force than the Z24 one. 450 vs. 400 Kg

 

Any '83-'86.5 Z20 or Z24 gas engine 720. Both used the same clutch. 400Kg/880 pound clamping force.

 

Clutch disc.......................... 30100-P9201

Pressure plate..................... 30210-10W00

 

Any '90- D21 Hardbody KA24E/KA24DE has the 240mm clutch with 450Kg/990 pound clamping force

 

Clutch disc............................ 30100-86G01 Japan Made

............................................... 30100-S4300 USA Made

Pressure plate...................... 30210-86G00 Japan Made

.............................................. 30210-S3800 USA Made

 

 

The 300zx also used a 240mm pressure plate with the VG30E and VG30DET that was 580Kg/1,276 pounds and 800Kg/1,760 pound.... I doubt you will need that.

 

[Socalman]

8 hours ago, Stoffregen Motorsports said:

I can't tell what that says, but we never use electric pencil to write on engine blocks when I was at Rebello. If anything, we used stamps, but we didn't generally label the motors we built.

What kind of HP did they put out on these?

[Socalman]

5 hours ago, datzenmike said:

 

Any '83-'86.5 Z20 or Z24 gas engine 720. Both used the same clutch. 400Kg/880 pound clamping force.

 

Clutch disc.......................... 30100-P9201

Pressure plate..................... 30210-10W00

 

Any '90- D21 Hardbody KA24E/KA24DE has the 240mm clutch with 450Kg/990 pound clamping force

 

Clutch disc............................ 30100-86G01 Japan Made

............................................... 30100-S4300 USA Made

Pressure plate...................... 30210-86G00 Japan Made

.............................................. 30210-S3800 USA Made

 

 

The 300zx also used a 240mm pressure plate with the VG30E and VG30DET that was 580Kg/1,276 pounds and 800Kg/1,760 pound.... I doubt you will need that.

 

Thank you!

[datzenmike]

The stock KA24E was about 140 HP. The Z24 is identical displacement however the Z24 piston dish is about 13cc larger than the KA piston and the KA-E head is about 8 or 9cc larger than the Z24 combustion chamber. If this has Z24 internals then the compression would be just under 7.5. I would have to conclude that KA24E pistons are in this Z24 block.

[Socalman]

28 minutes ago, datzenmike said:

The stock KA24E was about 140 HP. The Z24 is identical displacement however the Z24 piston dish is about 13cc larger than the KA piston and the KA-E head is about 8 or 9cc larger than the Z24 combustion chamber. If this has Z24 internals then the compression would be just under 7.5. I would have to conclude that KA24E pistons are in this Z24 block.

Why not just use the KAE block? 

[datzenmike]

I agree!!!! HRH did something like this with a Z24. Can't remember. If KA head on Z24 or Z24 head on a KA.

 

I know that the KA-E head has two oil drain back holes, one that opens into a coolant passage in L and Z series blocks at the back. This has to be sealed off on the head.

 

Z24 rods are thicker a have to be heavier. rod bearings are the same but KA mains are a lot narrower.

 

L and Z series engines circulate coolant from the pump into the right side of the block cylinders while the KA pumps coolant into the left side. From here the coolant goes up into the heads. Both engines are cross flow so I don't think this would matter much. It all depends on the head gasket holes.

[Stoffregen Motorsports]

Using the Z block allowed the use of standard L series accessories, water pump, etc. This was a detail aspect that doesn't matter, but some guys wanted it that way.

 

HP ranged from 200-240 in street trim. Back in the '90s. Rebello is now making over 240 with his big bore L series.

16 hours ago, Socalman said:

What kind of HP did they put out on these?

 

[Socalman]

On 4/6/2024 at 11:11 AM, datzenmike said:

 

Any '83-'86.5 Z20 or Z24 gas engine 720. Both used the same clutch. 400Kg/880 pound clamping force.

 

Clutch disc.......................... 30100-P9201

Pressure plate..................... 30210-10W00

 

Any '90- D21 Hardbody KA24E/KA24DE has the 240mm clutch with 450Kg/990 pound clamping force

 

Clutch disc............................ 30100-86G01 Japan Made

............................................... 30100-S4300 USA Made

Pressure plate...................... 30210-86G00 Japan Made

.............................................. 30210-S3800 USA Made

 

 

The 300zx also used a 240mm pressure plate with the VG30E and VG30DET that was 580Kg/1,276 pounds and 800Kg/1,760 pound.... I doubt you will need that.

 

I ordered a 1990 D21 clutch kit, everything seems the same as what came with it, except the pressure plate is shorter than what I ordered, is this going to be an issue? 

 

[datzenmike]

 

 

The left one is the shorter?

 

Diaphragm height is critical or a different matching release collar must be used.

[Socalman]

6 minutes ago, datzenmike said:

 

 

The left one is the shorter?

 

Diaphragm height is critical or a different matching release collar must be used.

Yes, the left is shorter, but the teeth (I assume diaphragm) in the center are the same height, just the housing is taller, so I think kit should be ok to use without issues?....

[Stoffregen Motorsports]

The teeth are called fingers and they can be shaped differently and look different, but when bolted down to the flywheel, they could end up the same height. Speculating of course, but I have seen this.

 

So bolt it up with the disc and compare the finger depth that way.

[datzenmike]

Probably true of almost all Datsuns but I'll stick to the 71B here.... The slaves and the masters all push about the same amount of fluid and move the clutch arm the same amount... 1.18" at the slave. This is important because the clutch arms are all the same so there is a narrow range of motion or the release bearing. If the diaphragm fingers are too tall the release bearing will be up against them even with the pedal all the way up. Pressure plate will not be clamping the disc fully, and there is slippage. On the other hand if the diaphragm fingers are lower the release bearing won't travel far enough to fully release the clutch disc and hard shifting and synchro damage will result. The release collar is the variable to allow for longer or shorter finger heights.

 

The sweet spot measured from the flywheel surface, back past the diaphragm fingers, past the release bearing and to the very back of the collar* I found is 89.4mm. I wrote the link down 15 years ago but it's dead now. Much later someone on the realm said 92mm so... pretty close.

 

*I believe it's the back of the collar and not the two wings that the clutch arm contacts.

 

Maybe someone withj their transmission could measure the bearing collar and bearing and the diaphragm finger heights and add them. Is it near 89.4mm or 92mm???

[Socalman]

On 8/27/2008 at 1:57 PM, bonvo said:

http://i70.photobucket.com/albums/i100/bonvo/kaz25-2.jpg

 

looks like a strong runner and look at the complete exhaust system that comes with it:eek::lol:

 

http://i70.photobucket.com/albums/i100/bonvo/kaz25.jpg

I wonder what distributor that is on this? 

[Stoffregen Motorsports]

Looks like a Mallory.