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Engine Rebuild Plan


wil84911

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Replacing the tired 260Z motor in my 71 with 280Z block and head. Will run mild cam, lightweight flywheel, keep the triple Weber 40s. Car street driven and probably some autocrossing.

 

Would like increased compression. This good?

 

 

12/70 2.6 block E88 heads Mallory triple Weber 40s headers ext oil cooler Twice pipes Tokico Ilumina Eibach springs frnt/rear sways

 

 

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Not enough info.  Many piston-combustion chamber combinations.


Was staying stock pistons but open for suggestions.



12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways
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I tried to link datsunzgarage.com but it goes to some crazy crap.  Don't know what happened but they had a lot of good information on a ZX motor mod for 240s.  A member here, @Diseazd, has 5 of them I think.  It's an F54 flat top piston block bored .030 over with a P79 head shaved .080 with the earlier 280Z valves and Isky cam kit.  A real beast from all I've read from him.

Here's something to play around with, http://www.ozdat.com/ozdatonline/enginedesign/

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Still not enough info


Sorry I’m not well versed on engine internals. I simply have an idea of what I think I want to gain power so please pardon me. I’ve got a friend working on this for me.

Stock 280Z block and head (can’t even tell if early or late) but will be getting stage 2 cam, triple webers dcoe40, lightweight flywheel.

Anything I should be doing/upgrading or can do to add some power without going crazy expensive?

Any other details I need to specify kindly let me know.

IMG_0129.JPG
Heres the block.

IMG_0225.JPG
Heres the N42 head


12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways
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The engine has a head on it.  Looks like either an N47 or a P79.  Are you sure that's not a 280ZX engine?  If it's an N47 head there's no real benefit to swapping to an N42 head.

It's been very well described all over the Z sites about where the ID numbers are for the engines and heads.  Get those numbers and you'll be way ahead.

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The engine has a head on it.  Looks like either an N47 or a P79.  Are you sure that's not a 280ZX engine?  If it's an N47 head there's no real benefit to swapping to an N42 head.
It's been very well described all over the Z sites about where the ID numbers are for the engines and heads.  Get those numbers and you'll be way ahead.


That’s an N42 block with an N47 head which I won’t be using. It will mate with the N42 head in other picture.



12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways
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28 minutes ago, Zed Head said:

 If it's an N47 head there's no real benefit to swapping to an N42 head.

You're going to swap a similar head on to an existing short-block, and install a high-performance cam shaft.  So far.  You could just install the cam shaft and save the head swap money.

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You're going to swap a similar head on to an existing short-block, and install a high-performance cam shaft.  So far.  You could just install the cam shaft and save the head swap money.

 

That was the plan though rebuild that short-block but more research says an N42 performs better.

 

 

12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways

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5 hours ago, Zed Head said:

That's bad research.  They are identical except for the exhaust port liners.

That depends.. In europe for example we have no exhaust port liners…  therefore these heads can be better.  personaly i think there is not much if any diff. in the N42 and N47.   I've got a N42 on my 280zx and it has a compr. of 10.1 to 1 standard.  it runs very well.

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I’d venture to say all the early dished pistons BLOCKS are the same . Performance wise I would find a later flat top piston block. 

Cylinder head. N42 and N47 are the same except for the exhaust ports . The 42 lends itself to more porting advantages , but for just swapping parts it’s a wash 

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7 hours ago, dutchzcarguy said:

no exhaust port liners…  therefore these heads can be better.

That seems to be the assumption that is made, based on appearance.  But there is no data to back it up.  The big rectangular exit hole of the N42 head looks better compared to the N47 hole.  Bigger is assumed better.  But...no proof.  And Nissan's specs are exactly the same.

Just adding some info for wil849's search.  Lots of ways to spend money with no significant benefit.  And possibly make power costing mistakes, like putting round headers on square exhaust ports.  

Edited by Zed Head
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That seems to be the assumption that is made, based on appearance.  But there is no data to back it up.  The big rectangular exit hole of the N42 head looks better compared to the N47 hole.  Bigger is assumed better.  But...no proof.  And Nissan's specs are exactly the same.
Just adding some info for wil849's search.  Lots of ways to spend money with no significant benefit.  And possibly make power costing mistakes, like putting round headers on square exhaust ports.  


Thank you Zed. Thanks for everyone’s feedback. It really helps. We try avoiding the expense but want the best possible combo and I still make lots of mistakes.



12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways
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Good luck.  You can spend a lot of money just on the rebuild.  Check that head for warpage.  It might need machining, which will add cost.  A big shave will need camtower shims.  All kinds of nickel and dime stuff.

Your new camshaft will need a set of rocker arms and lash pads.  I'd put a list together and see where you can save.

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Good luck.  You can spend a lot of money just on the rebuild.  Check that head for warpage.  It might need machining, which will add cost.  A big shave will need camtower shims.  All kinds of nickel and dime stuff.

Your new camshaft will need a set of rocker arms and lash pads.  I'd put a list together and see where you can save.

 

Thank you.

 

 

 

12/70 260Z motor Mallory dist triple Weber 40s ext oilcooler headers twice pipes Tokico Iluminas Eibach springs frt/rr sways

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16 hours ago, siteunseen said:

N47 was the first oiling cam as far as I know, N42 had spray bars.  My 9/'76 N47 had both

Nope... N42 in my euro 280zx from early 1979..   ('79 was it's first year in the Netherlands! )  was already a self oiling cam..

 

 

20140710_143042 (1).jpg

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I tried to link datsunzgarage.com but it goes to some crazy crap.  Don't know what happened but they had a lot of good information on a ZX motor mod for 240s.  A member here, [mention=13264]Diseazd[/mention], has 5 of them I think.  It's an F54 flat top piston block bored .030 over with a P79 head shaved .080 with the earlier 280Z valves and Isky cam kit.  A real beast from all I've read from him.
Here's something to play around with, http://www.ozdat.com/ozdatonline/enginedesign/



I’m in the processing of building out a mirror website for datsunzgarage, a lot of information on that site.

I have the engine page up,
https://specterbyte.com/datsunzgarage/engine.html

Should be a couple days, I think I found a way to get the rest of the site up.
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