Crappy 94mm pistons

Bleyseng · Post by **Bleyseng** » Sat Jun 22, 2013 10:54 am

Trying to show what the flat top 94mm pistons with "short skirts" do. Lots of rocking in a 2.0l so after 5k are junk. I used them in a pinch but what a waste of money.

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Post by **Amskeptic** » Mon Jun 24, 2013 12:25 am

Bleyseng wrote:Trying to show what the flat top 94mm pistons with "short skirts" do. Lots of rocking in a 2.0l so after 5k are junk. I used them in a pinch but what a waste of money.

(Sent from my iphone)

Yetch. I could not perform any sort of armchair forensics from the pictures. Looks like a host of serious issues.
Colin

72Hardtop · Post by **72Hardtop** » Tue Jun 25, 2013 1:17 am

I'll bet they could be heard at first start (cold) as well. What piston/cylinder set did you use?

Bleyseng · Post by **Bleyseng** » Tue Jun 25, 2013 7:19 am

They were AA 94mm flat tops and a little noisy at startup.

Post by **Amskeptic** » Tue Jun 25, 2013 8:49 am

Bleyseng wrote:They were AA 94mm flat tops and a little noisy at startup.

We are waiting for Kubelwagen to post picture of his failed piston to compare skirt area.
He had a collapsed crown and a horrible "channel" down to the first ring where its gap resided. Looked like the Columbia space shuttle heat failure due to pre-ignition detonation damage.

The skirt areas are looking way too small for these big 94mm pistons which have to run extra clearance when cold.
Colin

Bleyseng · Post by **Bleyseng** » Tue Jun 25, 2013 6:35 pm

Amskeptic wrote:
Bleyseng wrote:They were AA 94mm flat tops and a little noisy at startup.
The skirt areas are looking way too small for these big 94mm pistons which have to run extra clearance when cold.
Colin

Yes, definitely! Its a poor design and it proved it in 5k... The design works great in a V8.

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Crappy 94mm pistons

Crappy 94mm pistons

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