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korijo's Avatar
 
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What kind of pistons are these?

All I see inside the piston is "TS". Any ideas? 94mm with 24mm pins.

Thanks for your help....

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Old 12-01-2002, 05:41 PM
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What kind of pistons are those? The kind that have less than 8:1 compression. 7.5 or 7.6 to 1 US spec pistons. Paperweights.
Old 12-01-2002, 06:24 PM
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c'mon now!!
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Old 12-01-2002, 06:28 PM
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I can see it on evilbay now: " genuine Porsche! German paperwieghts, set of four for the Porsche lover in your family....." Start the bidding at $1000 because it is on ebay, and you did say Porsche
JK
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Old 12-01-2002, 06:59 PM
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Put some Por-15 on 'em and I'll bet you might have something there.
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Old 12-01-2002, 07:10 PM
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100 bucks new. rings, pins, AND cylinders included. ALL NEW!!
Fair enough. They came with the cylinders, as far as I am conserned.

Leave me alone, I like POR 15. I would if I could.

Dont Hate Dont Hate

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Old 12-01-2002, 07:49 PM
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They also make nice ashtrays.

Hey. they'll work fine as long as you don't expect too much more than 90 HP. Work great with FI and Arco gas.

Last edited by Zeke; 12-01-2002 at 08:24 PM..
Old 12-01-2002, 08:20 PM
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Yup, thos look like the pistons that were in my engine before the Euro's were put in there. xcept mine had about 180,000 miles on them and didn't work
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Old 12-01-2002, 09:36 PM
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Ayup. I could use four ashtrays for the shop.
Them effin' domed pistons won't stand upright worth spit.
Those boogers will.
I'll start the bidding at 10 bucks for all....& you can keep the pins.
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Old 12-01-2002, 10:33 PM
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Just because I am trying to learn, puts a target on my back, sheesh.

You old men and your asstray jokes, sound like school girls giggling (hehehehe)

Stay cooool
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Old 12-02-2002, 12:05 AM
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heheheheheh.
I see we've all recovered from our Thanksgiving stupor!
Korijo, you can measure the dish in those babies using a syringe and flat plexi plate, and calculate the CR, but your esteemed elders appear to be correct about the 'ashtray effect'.
Winging it here, so someone step in, but my stock pistons had a 4cc dish, euros have less or none. My 'bargain' NOS 96 mm NPRs have a 7cc dish and in spite of the bore increase I had to flycut the heads to get the CR to where I wanted it.
Those may well be bus pistons.
You know, except for the shape of the dish, those look a lot - an awful lot - like my NPRs which were supposed to be very good. (Greg Aaronson at FAT: "Jeez, I wish I could still get those') He went on to comment that they were accurately made and that they had few problems compared to stuff they can get today.
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Old 12-02-2002, 04:52 AM
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Euro's are flat top, no dish whatsoever..........


Korijo, measure everything to see what your compression will be...it would be a shame to spend a bunch of money to be disappointed with a motor with too low of compression


If all else fails and the compression is pathetic....add a turbo or supercharger
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Old 12-02-2002, 08:36 AM
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The original European 94s (8:1 compression) had a dish, but it was a smaller one than the US-spec 914 2.0 pistons (7.6:1). The factory manual shows cut-away illustrations of both. There are also aftermarket Euro 94s that Mahle makes that are flat-topped.

Those pistons look like they have a much larger dish than the old Euro-spec 94s or the regular US-spec 94s. I would guess them to be Bus pistons.

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Old 12-02-2002, 08:53 AM
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Tighten up that deck and get a nice swirl out of 'em, thats all I could think to do.

Tight deck is a good thing.

Later,
Tom
Old 12-02-2002, 02:26 PM
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I've an old piston from a bus and one of the dished euro's Dave's talking about. this piston seems to have a more gradual slope to the center than those. It's hard to tell from this picture. How deep is the middle of the piston

PD
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Old 12-02-2002, 04:07 PM
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