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AW11 MR2
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Discussion Starter #1
Hi Guys,

First time poster, long time browser of the forums! I am attempting to build a mini-me D15 with carburettors. Ideally I would like D13 pistons in order to bump the compression of my build, however i have an '89 EF Civic for scrap that has a D14a1 lump in it that i would like to utilise if possible. My question is how much difference is there (in terms of diameter/height/dome/etc) between the D14 and D13 pistons? As i have never seen a D13 piston. Any help would be greatly appreciated!
 

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93 Legend L Coupe.
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Most people here aren't going to be able to help you. Rushi may be able to, but, he ignores this site mostly. [email protected] may also be able to help you, or some of the other guys from Europe or Indonesia.
 

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Discussion Starter #3
Thanks Beaver, Information on the european motors seems to be a little thin on the ground :( If I can't get any solid data i'll probably just go D13's to be on the safe-side
 

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Discussion Starter #6
Beaver, Yeah no doubt I'll end up dismantling the a1 in which case I'll get a hold of some pic's and dimensions (maybe even that elusive piston code?). Neman, I've seen that project before, looks great but I wanted higher compression without spending a lot of money ideally. Also I intend to utilize 4 motorbike carbs for this one - dependent on how far my limited funds and knowledge allow me.
 

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ed7
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You have all calculations there, but the dome on pistons isn't that big...

They look huge but if you compere them to p29 they suck(if you want yo go high)...
 

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Dome isn't the whole picture. Some of the smaller D pistons have a 30mm compression height, which is way more desirable than a PM7 29mm compression height. This keeps the SCR almost the same as the PM7/P29 pistons, but yields better combustion and easier/safer tuning.
 

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Discussion Starter #9
The calculations are based on the standard 14a1 pistons - my understanding is the d13's have a higher dome, i'm not certain how much this is hence the point of this thread. Also I'm using a d15b block which is taller than the d14 so the calculations won't add up for me, good reference though!
 

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Discussion Starter #10
I dragged the pistons out the old D14a1 block today (was a right bitch). Turns out the pistons are PM2 - This means little to me, but hopefully this might be of use to you Beaver? I've enclosed a couple of pictures, but i won't pretend I know what measurements you're after so just give me a shout if you want some measurments done - I would be happy to do them for you.

http://i897.photobucket.com/albums/ac171/mcchase/D-Series/IMAGE_070.jpg

http://i897.photobucket.com/albums/ac171/mcchase/D-Series/IMAGE_067.jpg
 

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Discussion Starter #12
I'm using a complete D15Z6 bottom end and the PM2 pistons with a Z6 head. I haven't checked the wristpins yet - I'll just prey they fit
 

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Discussion Starter #14
Crap. I'll have to bore them on a lathe when i get back to university. Are you sure of this? Have you seen the PM2 pistons before?
 

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Discussion Starter #16
Ok hi-comp, thanks for the prior warning. It looks like some machining will have to be done.
 
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