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E31 vs E88 vs N42


blue_leaf

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Well I have narrowed down my possible choices of the head to this three for various reasons. Could anyone give me a clear answer as to which one flows best stock and which one is easy to improve (= minimum financial investments:) )? My engine is to stay NA and FI. I am aiming to have compression of low/mid 10s (btw can I use 100 octane fuel - the highest octane fuel available from pumps here in Australia as far as I know?). Also I am using an L28 block with flat top pistons and read somewhere that an E series heads will give me the required compression without any modifications - can anyone confirm this?

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Umm, let's think a bit here. If you are planning to stay with injection (and there's no reason not to if yours is working well), neither the E31 or E88 heads will work without serious mods. Neither of those heads have the notch to clear the injectors, nor do they have the holes for the injection manifold studs. Of the three you listed, your only reasonable choice is the N42.

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Don't forget a P90(best flow) and a copper head gasket(in the required thickness).

Will

As far as I know the P90 never was available in Australia - you are welcome to correct me here.

Umm, let's think a bit here. If you are planning to stay with injection (and there's no reason not to if yours is working well), neither the E31 or E88 heads will work without serious mods. Neither of those heads have the notch to clear the injectors, nor do they have the holes for the injection manifold studs. Of the three you listed, your only reasonable choice is the N42.

Oh, ok. Thanks for the info I didnt know that - this makes the choice much simpler :)

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As far as I know the P90 never was available in Australia - you are welcome to correct me here.
We didn't know that you were in OZ, it would be helpful for the future if you put your location in your profile so we can see things like that.
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And should you find a P90, you may not be happy with the compression it gives without modifications. On an L28 with flat-top pistons the P90 is only going to give 8.8:1 or so. Maybe 9.0 if you mill it a bit.

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G72S20 has the idea 'Sport Classic at Castlereagh near Sydney are a good source for all Zed parts, Carlos....... will find what you need.

Highly recommend P90 injected L28 (F54) sourced in Australian for 240Z 'Sport'. For N/A or boosted this is the best possible combination for L series within availability or price range.

The other options in Australia are P90a or E88 (R30) version with injection shaped inlets

Early E30 and E31 heads are getting super long in the tooth, not usually in good enough condition to consider. Good luck

cheers

Steve

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I'd recommend an N42 for alot of the reasons stated above. I'd also go with an N42 in general since P90's are over priced and under compressed :).

P90 is the best head for turbo charging stock. For N/A I reakon the N42 is the best to begin with.

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As far as I know the P90 never was available in Australia - you are welcome to correct me here.

Actually the P90 was available here although somewhat rare. It could be found on the 1980's patrol's. It was also available on some late 280zx's although I can't confirm the ZX part. It was definately found on some model's with the L-series.

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Hi Gav,

good comment, got to agree on the N42 for a stock as a rock change over maintaing compression with the flat tops with minimal work.

I am a very happy P90 supporter myself, In my case I bought my P90 head off the shelf, factory new in Sydney many years ago. Did a performance build on an L28 looking for those low 10 compression numbers, flows sweet N/A on injection (daily driver).

cheers

Steve:classic:

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Of the three head you ask about - the N42 flows the best stock, it has larger intake and exhaust valves to begin with. (44/35 vs 42/33).

The N42 & E88 have close to the same combustion chamber size and design. E88 is 44.7cc and the N42 is 44.6. By comparison the P90 had a 53.6cc combustion chamber... so you'd have to mill it to get the compression up - then most likely shim the cam towers to get the correct height to keep the chain tight etc.

An N42 with Flat Tops should put you right around 9.5:1 as I recall, but if you mill it a bit, then unshroud the valves it will come out between 9.5:1 and 9.8:1. You'll have to cc the combustion chambers when the initial work is done... to see where you end up. Just do a little Port Matching and your good to go.

With any of these older heads - be sure to have your machine shop check them closely for micro cracks before you put any serious money into them.

Good luck,

Carl B.

Clearwater,FL USA

http://ZHome.com

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  • 3 weeks later...

I have an L24 engine (E88). From what I read it's not the best engine to swap. But this is the engine I have, so I decided to add some:

headers and exhaust system by Monza,

ignition sist. its a crane XR3000 with crane ps91 e-core coil, (like to know if the best distributor for this sist must be the Mallory UNILITE electronic).

Im also planning to change camshaft (factory one) for a Performance Camshaft, Stage III, 70-83 (from the Z store) The specs are

"Grind: 17034. Lift(In/Ex): .460/.460. Duration(In/Ex): 270/280. Characteristics: Rougher idle, excellent performance. Pulls hard from 3000-6500 RPM."

For now Im going to use the SU carbs but going after($$$:cry:) for a Weber Triple Carburetor Kit, 40 DCOE.

Please help me with the info on distributor and what do You think on this engine swap.

Bad trip the trany its a manual 4 speed and R180 (I would like to change it for 5 speed and a R200, but dont have the money for that now, so later will be if can not sure if L24 can use a 5 speed trany.

Streets here in Panama are short but sometimes I like to drive to the beach that is 50 miles from home, so like to go kind of fast.

What Im looking is to have a very fast street car; is this ok for what Im looking for?

My first Z and I know this forum is full of people that really know about this beautiful girls so all comments are welcome.

Thank You for your help.

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