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Z20E with U67 Head


hobbes_the_cat

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Ok I want to run this by you guys and see if this idea is worth my time. would love to hear if anyone of you has actually run this combo... I searched and can't find anyone who has.

 

I have access to a complete z20e with low miles. I also have a U67 head with a nice cam, port work and unmodifed chambers.

 

I'm thinking if this z20e has factory flat tops I'll just drop the U67 on it and should get a decent street engine with around 9.0 compression without much fuss.

 

Is this a good idea or will it just feel like a stock L20b? Am I missing anything?

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I think the z20s has the flattops. Only way to know is to remove the head.

 

This motor is a little bit of a long rod. I wish I would have kept the z20 I had to do the same thing with.

 

 

If the pistons in your motor are dished, it's just barely. A C/C head would do amazing on that motor still.

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Z20E definitely have flattops (I had two sets) with two pair of tiny eyebrow cuts for valve clearance. Compression is 8.9 with a U-67 head.

 

Raising a half point of compression might gain you 3-4 hp above stock.

 

The Z20E has 152.5mm (6") rods vs. the 154.9mm for the L20B. You might gain another couple of hp from reduced side loading of the pistons. Long rods tend to favor ultra high revs but for normal use you probably won't notice the difference.

 

Definitely do this.

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Does this complete z20 have an FI intake manifold attached to it? If so, and you're not interested in it...? Send me a pm if you have any interest in parting with it at some future date.

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I always wondered about this build, Z22 block, Z20 crank/long rods, and VG30 pistons(88mm), with open L block head, I wish I had done this to the LZ2.3 build I am doing now, and I have/had everything I needed, but didn't understand what I had till it was too late.

 

That's barely 2.1 wayno. Long rod, I'll give you and if fed enough carb and cam and if you twist it really high would make more power.....but KA pistons, Z22 crank and L20B rods give you a low RPM stump puller. If you were building a race engine yes but I don't think you made a mistake.

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That's barely 2.1 wayno. Long rod, I'll give you and if fed enough carb and cam and if you twist it really high would make more power.....but KA pistons, Z22 crank and L20B rods give you a low RPM stump puller. If you were building a race engine yes but I don't think you made a mistake.

 

I probably would have been disappointed in it like I am with the L20b engine in the 520 now, that is why I am building the LZ2.3 to replace it, as I have no grunt or high RPM power, but it cruz's on the hiway just fine.

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Better yet, run it with the Z20E EFI stuff too. Super easy to wire up and will net better power/economy than a carb(s).

I thought about that but I would be putting it into a 71 510 so I'd need a Z transmission (just the engine is available) and I think oil pan mods and motor/ trans mount mods at least since the Z is at a different angle right?

 

I have tons of L series parts already so I wouldn't need to buy anything to build the hybrid. I do like the efi idea though...

 

Anyone know the hp numbers for a stock z20e from a 200sx? I certainly don't want to swap the L head into it just to make less power.

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About the same as the L20B for power there is no magic hidden power on an EFI 2 liter engine.

 

Put the L head on and run it in your 510. You can't run the EFI because the Intake will lean over too close to the pass side strut tower when in the L position.

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So the internets say that the Z20e is rated 100hp stock. An L20b is what, 96hp stock?

 

Pretty sure I can crack 100hp with the hot cam, port work and higher compression from the flat top pistons so I'm leaning towards the hybrid.

 

I appreciate all the input from you guys. I have played with a ton of Datsuns and owned a few hybrid LZ engines but for the most part have avoided building any of the engines.

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I thought about that but I would be putting it into a 71 510 so I'd need a Z transmission 

 

A Z20/Z22 trans is ideal, but it's just the angle that's different. A slight bend in your shifter and a few tweaks to the trans mount will let you use the trans you already have.

 

 

I think oil pan mods and motor/ trans mount mods at least since the Z is at a different angle right?

 

FWIW, plenty of guys have done this swap and just used the stock 510 pan with no ill effects. As for mounts, yes you'd probably want 720 engine brackets, or flip yours side to side and shorten one of them to even out the angle. 

 

You can't run the EFI because the Intake will lean over too close to the pass side strut tower when in the L position.

 

But why would you do that???  ^_^

 

 

 

But for real, I don't want to talk you into it, even though it sounds like I'm trying to. :P

 

I love the Z engines, and would switch to one in a heartbeat. They are easier to work on, less problems with carbs getting hot, more torque, etc. 

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Yes you can lean the L transmission to mate to a Z series engine but not by placing a wedge under the mount. The transmission won't rotate on it's axis without the tail lifting and fucking up the drive shaft angle. If you totally modify the trans mount on the car you can get this to work.  You're looking at bending the shifter about 20 degrees in all.

 

If a Z series run the Z series oil pan. A Z series in the Z series position with an L series pan will have it drooping down on the left side at 20 degrees. It will be the lowest point on the engine. Use a Z series pan or mod a Z series pan to fit a 510.

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If a Z series run the Z series oil pan.

 

I agree. Just said you could use the 510 pan.

 

 

Use a Z series pan or mod a Z series pan to fit a 510.

 

Would require mods to something. Either flip the crossmember and go 200SX/A10 front sump, or a bit of cut and paste on a truck pan. No Z pan works as is. 

 

But then again, the only pan Nissan ever built that works in a 510 is the 510 pan.   :rofl:

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You want to see what it takes to fit a Z into a 510?

 

Check out my build thread "half pint"

 

I swapped a z22 with long tail 720 trans into my 510 wagon. Customized oil pan, flipped from side to side L series engine mounts brackets, 510 engine mount rubbers, modified 720 trans mount on flipped 510 trans bracket, trans mount relocating brackets.

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^^^ I have read your thread. It's part of the reason I originally dismissed the idea of swapping in the complete z20. :) lots of little issues to overcome.

If I swap the L head onto the Z20 short block, I basically have a bolt-in engine for my 510. Plus I already have all the parts. That's an added bonus.

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