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t3h r0XX0r!!
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Update: added 33M head. incidentally, i've one for sale. i don't know the deck thinckness, but you could cut it to up the compression, and it does have the high-flow, low-swirl intake ports...
 

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Discussion Starter · #44 ·
Lazarus_023 said:
Update: added 33M head. incidentally, i've one for sale. i don't know the deck thinckness, but you could cut it to up the compression, and it does have the high-flow, low-swirl intake ports...
Hi Guys,
Just a note here. I read in the Nissan motorsport catalog that quote: "Compression increases in E-series engines should be obtained with the use of alternate pistons and NOT by cutting the cylinder head [OE thickness = 120mm/4.72"].

Another reason not to cut the head is that you will retard the cam timing considerably, and the timing belt will be too long as well.
 

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Moved on...Ciao!
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Kewl! This is the thread I was looking for. In my quest to build up another E16i for my beloved Pulsar, I dug up an old head from a Japanese crate engine swap I did 3 years back. This head is the 52A; What I can tell you is...

* Valves are 37mm intake/30mm exhaust
* Combustion chambers are full-concave
* 10mm passage drilled through head from front to back between
cylinders 2 and 3
* 3mm hole next to #3 intake port clear into coolant jacket
* Separate rocker and valve cover studs

I still have the 33M head that came off the donor engine I got recently; For $75, I got a great deal! Little to no wear on a 117K E16s; You can still see the cross-hatch marks on the cylinder walls! But...can anyone tell me anything about the 52A head?

blownb310 said:
Another reason not to cut the head is that you will retard the cam timing considerably, and the timing belt will be too long as well.
That depends on how much you cut the head. There's a reason why the camshaft pulleys have a second camshaft pin locator notch; It compensates for any re-decking of the head.
 

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just rattle can it
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recycled_toddler said:
I wouldn't...really. If nothing's happened so far, why tempt fate?
Well, I haven't started the motor yet sooo...I tried to forsee all of the harmful effects of a head swap, and I dont beleive mine's been shaved. Oh well....if it blows up, it blows up.
 

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t3h r0XX0r!!
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recycled_toddler said:
52A; What I can tell you is...

* Valves are 37mm intake/30mm exhaust
* Combustion chambers are full-concave
* 10mm passage drilled through head from front to back between
cylinders 2 and 3
* 3mm hole next to #3 intake port clear into coolant jacket
* Separate rocker and valve cover studs
please check the inlet ports. do they have the high swirl or straight inlet ports? also, are the ports the same diameter as the E16? check the combustion chamber volume if you can...

recycled_toddler said:
can anyone tell me anything about the 52A head?
three possibilities...
1) it's out of an F310 or early pulsar, they had "A" part numbers, IIRC.
2) it's from a JDM (or at least non-american) engine, i think the japanese engines had different castings.
3) It's an actual warranty replacement engine. for simplicity's sake, they had the best of everything installed to cover all eventualities.

NOTE: i added the above info on the 52A to "the list"
 

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Lazarus_023 said:
please check the inlet ports. do they have the high swirl or straight inlet ports? also, are the ports the same diameter as the E16? check the combustion chamber volume if you can...
Ports appear to be the same in diameter and design as the 33M; I wouldn't know the difference. What would I be looking for? The combustion chamber cc amounts to approximately 21cc. The valve heads are unshrouded; the chambers are full-dish, true hemi.

BeEleven said:
Well, I haven't started the motor yet sooo...I tried to forsee all of the harmful effects of a head swap, and I dont beleive mine's been shaved. Oh well....if it blows up, it blows up.
Pull the plugs and hand-crank the engine. If anything binds up, you got probs. Best of luck.
 

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t3h r0XX0r!!
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recycled_toddler said:
Ports appear to be the same in diameter and design as the 33M; I wouldn't know the difference.
can you look straight down the port and see the valve stem? that's a straight port. if the port takes some kind of swirly bend wrapping around the valve stem, that's a swirl-port.
 

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Lazarus_023 said:
can you look straight down the port and see the valve stem? that's a straight port. if the port takes some kind of swirly bend wrapping around the valve stem, that's a swirl-port.
Ah, OK. It's the swirl port, just like the 33M. 52A has swirl ports.
 

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I am about to put a E15ET head onto a E13 block. I am expecting to see small power gains due to the bigger valves and smaller combustion chamber. does anyone know where i can get a decent performance cam from?
 

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fingers said:
I am about to put a E15ET head onto a E13 block. I am expecting to see small power gains due to the bigger valves and smaller combustion chamber. does anyone know where i can get a decent performance cam from?
I got a Schneider cam for sale it's a 280' and I believe it has .460 of lift ....
 

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E15et head

Hi there guys i have a question about E15et head
The one that i have on the engine has a stamp 25M i have never heard of it before i just brought the car & noticed it wasn't a 15m head.Any info would be greatly appreciated.

Jimmy
 

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Discussion Starter · #58 ·
jimmyet46 said:
Hi there guys i have a question about E15et head
The one that i have on the engine has a stamp 25M i have never heard of it before i just brought the car & noticed it wasn't a 15m head.Any info would be greatly appreciated.

Jimmy
That's very interesting Jim.

It must be an Australian market casting. We never had those here in the USA. I'd love to hear if there are any differences/advantages in the 25M head.
 

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25M head difference

blownb310 said:
That's very interesting Jim.

It must be an Australian market casting. We never had those here in the USA. I'd love to hear if there are any differences/advantages in the 25M head.

About the 25M head the exhaust valve is 1 mm small in diameter the intake valve is the same. I would say it is a non turbo head.

Just a note it has a US tag on it with part number once i get it back from the machine shop i will post it



Jimmy
 

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blownb310 said:
The last head that I know of is known in the Nissan Motorsport catalog as the "Fuel Injection" [or FI] head. These did not come on any US market Nissans. It also wears the 15M casting number, but that number is not visible on the outside of the head like the others. It can only be seen under the valve cover. This head is essentially the same as the Turbo head in every way, except that it is a "thinwall" casting, for normally aspirated use. My understanding is, that this is a European O.E. head, where emmisions are not as stringent as the US versions. These heads were sold through Nissan Motorsport [I bought three of them], but are now NLA [no longer available]. About five years ago,I actually bought the last "FI" head, and was told by Nissan Motorsport, that they now are selling actual Turbo heads. And I'll tell you, that the price went way up too!
I've got 15M FI head!
:jawdrop:

I didn't know this until I took a closer look to my head and it really is it. How valuable are these heads today???
 
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