Non E15ET head, on E15ET block?

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N12turbo_DK2300
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Non E15ET head, on E15ET block?

Post by N12turbo_DK2300 » Thu Jul 23, 2015 6:40 pm

Hi
I'm brand new to this forum :) ...and the proud owner of a rusty Nissan Cherry Turbo N12 (as it is called in Europe).


Im considering installing a head from a E15S, on my E15ET block. From what I could see parts on valves, valve rockers etc.. everything.. is the same, so should work?

Then I found this nice article:
http://forum.n12turbo.com/viewtopic.php ... light=head
I could find the code on my old head to be correct, but the new head doesnt have any code at all (???) - but it was taking from a E15S engine, but you never know what previous owners did in the last 30 years...
E15S head should (from the article) be with high swirl intake ports.


Anyway: E15S head on a E15ET engine?

Let me hear your thoughts:
"Just don't do it!"
"Meh.. should work"
"I've done it before, it went (insert comment)"


I hope to hear from you guys :)

Best regards, one of the few N12 Turbo owners in DK.

15exa
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Post by 15exa » Fri Jul 24, 2015 6:22 pm

i had an e15s block with e15et head, that worked fin, so it should work the other way around,

are you swapping for any reason in particular? purely due to availability?

N12turbo_DK2300
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Post by N12turbo_DK2300 » Sat Jul 25, 2015 5:57 am

Mostly availability...
My current head does have some damages (discovered at las rebuild), plus this makes for the option of building a complete "new" enige, while still using the old one.
Everything is acutally prepared - just needs to put them together - and this was where I started getting cold feet :-/
My logic after comparing all partnumbers on nissan4u.com, told me the head should be the same (no P/N on the head, but everything attached to it...), until I found the article in this forum. I can identify the "15M" head, but no identification on the other.

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tassuperkart
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Post by tassuperkart » Sun Jul 26, 2015 1:44 pm

Any head will fit right on.
You just have to watch for valve/piston clearances.

But since you are using an E15s head on an ET engine, clearance will hardly be an issue.
The only thing that will vary much is the combustion chamber volume.

Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.

N12turbo_DK2300
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Post by N12turbo_DK2300 » Sun Jul 26, 2015 8:55 pm

By just doing an optical inspection, I couldn't see any differences. And everything has boltet on just fine :) Just hope everything can handle the 100+HP instead of 75.
The article I linked to, talk about the 15s head has some "high swirl intake" as the 15et head would have low swirl. Would that mean anything?

Thanks for the input so far. As I'm half way there, and summer holiday is up (and the DK summer this year is rubbish, so why not spend it in the garage) -I'll think I will give it a shot :)

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tassuperkart
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Post by tassuperkart » Tue Oct 13, 2015 4:10 pm

If the head is off an E15s, (11m) then its slightly lower compression that the E15 (15m) head.
the "high swirl" ports are a port that direct the incoming charge around a corner to create more "swirl" as the gas charge enters the valve area and combustion chamber.
these heads will bolt straight on but are a bit restrictive compared with the 15m head with its direct path to the valve.
Secondly, the inlet manifold may have somewhat different port shapes to the 15m head so you may need to grub the head out to match the manifold ports. I cant confirm this tho. Depends if the E15s was efi or not.

Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.

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photoglossy
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Post by photoglossy » Wed Oct 14, 2015 4:12 am

tassuperkart wrote:Depends if the E15s was efi or not.

Oracle
EFI E15S? All E15S motors are carbie, thats what the 'S' stands for. Carbie
:P

E15E is the code you're searching for, which have the 15M Head also.

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tassuperkart
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Post by tassuperkart » Thu Oct 15, 2015 10:54 am

Mah bad
I should have written E15e

Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.

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photoglossy
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Post by photoglossy » Fri Oct 16, 2015 3:41 am

Old man memory blank :p

N12turbo_DK2300
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How it went

Post by N12turbo_DK2300 » Thu Apr 07, 2016 6:07 am

Hi
So bad of me to not get back with the result...
...so time to do so now :)

The operation went well, and the engine purrs like a kitten. Everything fitted together just fine, and the engine is great again. Wohoo!
It also passed the Danish version of MOT and became street legal :)

It is currently stored in a barn during winter, waiting for the spring to come (which should be soon).

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tassuperkart
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Post by tassuperkart » Wed Apr 13, 2016 1:54 pm

Good stuff and good to hear.

PG..... thaaaaaaaaanks maaaaaaayyt!!!!!

Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.

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