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372 oe piston options

Kiwioilboiler

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Hello,

I just tried to order a new piston for my 2008 372. Piston is 50mm, twin ring.
NZ ipls show two piston options:

503 93 92 71 EPA

503 69 12 71

I've included a pic of my serial # and inside the piston for clarity.

Anyone know what the difference might be between the two, there's $60NZD for a start here and i don't want a soft low compression bugger either.

Cheers, Adam.
 

Kiwioilboiler

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Pics.
 

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Kiwioilboiler

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Thanks, turns out ipl difference was single vs twin ring, with the twin ring version the more expensive.

I bought a single ring Meteor instead for total cost of the difference between the two OEM options......$60Nzd vs 90 or 150.
 

huskyboy

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Thanks, turns out ipl difference was single vs twin ring, with the twin ring version the more expensive.

I bought a single ring Meteor instead for total cost of the difference between the two OEM options......$60Nzd vs 90 or 150.
Good choice! Just save and reuse your oem piston circlips if you can. The meteor ones are usually ok though.
 

Czed

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I like them personally
And have made some great runner's with them.
Torquey and high reving
With the lighter than oe windowed 268 and 272 pistons
With less mass are easier to start than my
Oe and bigbore saws.
But many Porter's don't like them.
 

Kiwioilboiler

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I like them personally
And have made some great runner's with them.
Torquey and high reving
With the lighter than oe windowed 268 and 272 pistons
With less mass are easier to start than my
Oe and bigbore saws.
But many Porter's don't like them.

Great for a DIY project.

I read up a bit on this and both your names came up, but my local machinist wasn't keen to learn a new skill unfortunately. I even went as far as checking with @markds2 if he had a demo 26x piston. Even with no base gasket I get 1.0mm of squish so I definitely see the attraction of the popup method.
 

mdavlee

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I like them personally
And have made some great runner's with them.
Torquey and high reving
With the lighter than oe windowed 268 and 272 pistons
With less mass are easier to start than my
Oe and bigbore saws.
But many Porter's don't like them.
I never got the same power with windows in a piston over a solid sided one. I think the lowers need worked a lot to beat a stock piston and bottom fed
 

Kiwioilboiler

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I never got the same power with windows in a piston over a solid sided one. I think the lowers need worked a lot to beat a stock piston and bottom fed
So a full circle skirt 266 piston is out of the question too, due to extending down and blocking transfer entrance?
 

mdavlee

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So a full circle skirt 266 piston is out of the question too, due to extending down and blocking transfer entrance?
I won’t say it’s out but raising the lower entrance is needed. It takes a lot to even get to where the windows are feeding them.
 

Kiwioilboiler

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Well i reckon its a shame given how prevalent loose squish on 372s appears to be that Meteor don't offer some taller crown heights. My saw was 1.3mm or 50 thou squish with gasket in, so a piston with a taller crown by 0.75mm or 30 thou would be just the ticket. I'd even accept a 0.5mm or 1.0mm taller, both could be workable.
 

Kiwioilboiler

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IMG_20200728_094715.jpg IMG_20200728_095615.jpg So for those following (thanks for all the advice), and those reading this as research in the future...

A single ring Meteor 371/2 piston is approx 0.4mm taller than the oem twin-ring i removed. Dropped no-base-gasket squish from ~1.0mm to ~0.6mm. Which i can definitely live with. As always your mileage may vary......

Meteor is indeed the best option in my case.
 
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Kiwioilboiler

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I won’t say it’s out but raising the lower entrance is needed. It takes a lot to even get to where the windows are feeding them.
Its also out because the full window piston skirt won't fit in the case, needs the sides off to be able to go to BDC, as i noticed today while actually paying attention.
 
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