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Hi guys,
I got something you got to explain : the NLA pistons 12010-13M22 are those Euro pistons and i did a little research and found a list, that those are interchangable with the 12010-73A22 (which we use in our E16S) and also with the 19M22, 11M22,13M02 and the 15M02.
I found that strange that these pistons would really be interchangable.
I cc'ed a 73A22 and got approx 24cc so the pistons are not the same but listed as interchangable E15 pistons ?

Result:
Our S models got 24cc-pistons (like on the pic I posted before) with valve reliefs and 17,9cc for the head which makes a comp. ratio of 9,59:1.

The I-models got 17,9cc pistons (33M22) and 24cc for the head: comp. ratio of 9,59:1.

What is this did they put all the parts in a box shook it and voila an E-engine and so on...
 

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12010-13M22 - Motorsports Piston/Pin (E16, STD)
---76mm bore
---32.5mm comp ht.
---crown top
---approx 18cc volume
---comp. ratio: 10.8:1 (18cc head), 9.4:1 (25cc head)

I ordered a set of those and they are 24cc
 

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hi guys, i`m newbie here. from malaysia
i`m driving b11 yr 83, " heart swaping surgery" was done a yr ago from E13 to E15E (from hb12)
i`ve been searching around to get more info about my e-engine, i found that this forum has most complete info for this engine....

few question here,
anyone know the compression ratio for E15E? wat piston was using by this engine?
the only thing i know is the head is 15m head......any idea ?
thanks guys..
 

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go to the parts store. order some E15 pistons. '83 MPG, if they get that detailed. should be the same.

there was also some chatter on here about using the GA16DE pistons AND RODS for a long-rod E16. this'll get you better dwell and lower peak piston speeds for better ignition and less piston side load.

ah. there's a pic you threw up already... that's the deal. just cut some valve reliefs. you should be able to have a shop mill them in, provided you know the diameter and depth. the dia you can measure, and the depth can be measured by a decent shop with a depth gauge, you'll just need to make a plot of piston height and valve lift (from head surface) vs crank angle and do some addition/subtraction.

blown, PM'd ya.

wat is the different between normal e15 piston and e15 mpg model? any picture? sounds interesting with this....can swap to normal e15 engine? hehe... so much question...
 

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Good day everybody,

This thread seems quiet for almost 1 yr. How is every1??

I found some interesting info, does any1 know Datsun A14 engine??
The A14 piston has
32.5mm comp ht.
76mm bore (engine stroke 77mm)
19mm pin dia.
which is very similar to E-series n/a piston.

Any1 try this b4?
 

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Hello Ching,

You are sharp for noticing the similarities in the two piston designs. I used a set of A15 pistons in my E16 for more compression in the past. I did a write up with pictures HERE.

Mike
 

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Hi Mike,

Great write up. Thanks.
Isn`t it A15 piston have 30mm comp ht.?
How much cc in the piston dish?
I didn't measure the cc's of the piston dish. It was close enough to a flat top for my purposes. I think I may have incorrectly reported the piston application. You're right, they were A14 pistons and not A15's. The old hand written box I got them from said A15 on it, but I don't remember flat top A15 pistons ever being factory installed in a USA model B310. So they were '77-'78 A14 pistons after all. Thanks for clearing that up!

Mike
 

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Hi Mike,

I`m planning to increase compression ratio near to about 10 to 11:1 for my E15E , i have a 15M head. Which piston will be suitable? calculated A14 (deep dished) piston will be over 12:1.
What else should i consider with this high compression?
Any1 have any info for A15 piston dish & cc??

Thank you.
 

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where can i get some a14 pistons?
 

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Hi all,
i`ve found something interesting about e-series engine.
E13 doesn`t share the same cylinder block with E15 and E16, E13 use shorter (about 25mm shorter than E15) and shorter connecting rod (12X mm).
 

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So was the whole GA series rods and pistons in a E series block claim ever clarified?

With that in mind, I am rebuilding a E16s at the moment and have some piston questions.

These are from another dedicated n12 site



Now, mine is a '86 E16s with a 31M crank, 31m con rods, notched pistons and a 11m head of all things. I can understand the reasoning behind a high swirl for a carb, but why this over a 31m this late into production? Leftover stock I guess.

As pictured.




What confuses me the most is the notched pistons.
If the 31m pistons (large land pistons in previous images) work fine in a 31m crank regardless of the variant of head, why are these even present in my block?
Perhaps related to the 11m head to make up for the smaller CC size and/or leftover stock, again?

Now if I get replacement pistons, they will be of the 31m style.
They SHOULD work right or am I just over thinking the whole valve clearance issue?

Lastly, the head. Getting my hands on a 31m off a wrecker is a easy task, but I see the benefits of the 11m head.
Since carbs do not mix the a/f as efficiently as FI, the high intake velocity would help, as I use a Weber carb.
 
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