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Main : Mechanical : Engine A15 3

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A15 3
A15 3Popular
SubmitterDale91More Photos from Dale91   Last Update2009/2/21 12:40    Tell a friendTell a friend
Hits2526  Comments14    0.00 (0 votes)0.00 (0 votes)
A15 freshly painted block

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
ddgonzal
Posted: 2019/10/23 21:01  Updated: 2019/10/23 21:01
Moderator
Joined: 2001/5/3
From: 48 North
Posts: 31693
 Re: A15 3
these are the G34 pistons

They are used with closed chamber H89 head and the offset dish allows some measure of quench

Poster Thread
Dale91
Posted: 2009/2/21 13:24  Updated: 2009/2/21 13:24
Just can't stay away
Joined: 2008/12/14
From: Adelaide,SA
Posts: 101
 Re: A15 3
yeah i see what you mean how the dish is offset.
Ratsun_a14: yep the more the dish the lower the compression

Poster Thread
Dale91
Posted: 2009/2/21 13:17  Updated: 2009/2/21 13:17
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Joined: 2008/12/14
From: Adelaide,SA
Posts: 101
 Re: A15 3
yeah just looked at some other pic of a15's and yeah they r stock, they hav a fair bit of dish for stockies though, i thought they would be flat when we took the head to rebuid it

Poster Thread
Mildman
Posted: 2009/2/21 13:19  Updated: 2009/2/21 13:19
No life (a.k.a. DattoMaster)
Joined: 2003/9/2
From: SE Melbourne
Posts: 3195
 Re: A15 3
My A14 looks like this....your dish seems a little offset - different to mine anyway.

Poster Thread
ratsun_a14
Posted: 2009/2/21 13:20  Updated: 2009/2/21 13:20
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Joined: 2008/2/20
From: sydney
Posts: 173
 Re: A15 3
does the dish lower the compression? what is the compression of the motor with pistons like that?

Poster Thread
Mildman
Posted: 2009/2/21 13:26  Updated: 2009/2/21 13:26
No life (a.k.a. DattoMaster)
Joined: 2003/9/2
From: SE Melbourne
Posts: 3195
 Re: A15 3
Dude these are the pistons fitted to the motor the day it was built at the Nissan factory - the compression of the motor with these pistons is the Nissan specified compression ratio 9.0:1.

These are not special pistons that drop the compression ratio of the engine.

Have you seen a standard Nissan A series with flat pistons before? I never say never - but I've only looked inside 3 and they were all dished to some degree...

Poster Thread
clyons8
Posted: 2009/2/21 15:16  Updated: 2009/2/21 15:16
No life (a.k.a. DattoMaster)
Joined: 2007/1/22
From: East New Britain, Papua New Guinea
Posts: 6981
 Re: A15 3
Your standard A10's and GX's have the flats.

Never seen the bigger engines with standard flats.

I have seen the offset recesses before but never on any of my engines.

Poster Thread
datto1000wagon
Posted: 2009/2/21 22:03  Updated: 2009/2/21 22:03
No life (a.k.a. DattoMaster)
Joined: 2006/5/2
From: Darwin NT
Posts: 2079
 Re: A15 3
chris is on the money
a10's had flatys so did the majority of gx's except some used dished pistons
if you want super low comp then an a10 head would be the goods but its round port (doesnt really matter when its boosted) but some say the round ports are better with angles

Poster Thread
Dale91
Posted: 2009/2/21 12:53  Updated: 2009/2/21 12:53
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Joined: 2008/12/14
From: Adelaide,SA
Posts: 101
 Re: A15 3
nah just stock i think,

Poster Thread
ratsun_a14
Posted: 2009/2/21 12:56  Updated: 2009/2/21 12:56
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 Re: A15 3
i've never seen them dished likr that before. What brand r they do u know?

Poster Thread
Dale91
Posted: 2009/2/21 12:59  Updated: 2009/2/21 12:59
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From: Adelaide,SA
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 Re: A15 3
nah sorry but yeah think they r stock cause i haven't changed em, do you reckon these pistons would go alright with a turbo, i.e. lower enough compression. cause i was thinking of turboin it later on?

Poster Thread
ratsun_a14
Posted: 2009/2/21 13:07  Updated: 2009/2/21 13:07
Home away from home
Joined: 2008/2/20
From: sydney
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 Re: A15 3
Yeah i reakon they could be decompression pistons becase the standard ones are flat,But i could be wrong. i reakon they would be ideal for a turbo set up

Poster Thread
Mildman
Posted: 2009/2/21 13:14  Updated: 2009/2/21 13:14
No life (a.k.a. DattoMaster)
Joined: 2003/9/2
From: SE Melbourne
Posts: 3195
 Re: A15 3
Dish is pretty stock - I've had dished pistons in 2 A12's (early and late) and an A14 stock - not sure which engine has flat pistons stock....

Poster Thread
ratsun_a14
Posted: 2009/2/21 12:52  Updated: 2009/2/21 12:52
Home away from home
Joined: 2008/2/20
From: sydney
Posts: 173
 Re: A15 3
llooks awesome!!!

R they decompression pistons?