'03 SVT - leaned out in 6th gear, melted piston - Page 2 - Focus Fanatics
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Old 08-07-2013, 11:56 AM   #11
SuperStockAMX
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I suppose you could take out the oil squirters but I'm of the opinion squirters are a good idea so we're limiting them.
These are SVT (aftermarket forged) Pistons that fit the SVT rod (same compression height / pin, etc).

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Old 08-23-2013, 09:42 PM   #12
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Pistons coated. The coatings are by Tech-Line. The piston crown is a reflective coating which keeps is to keep the heat in the combustion chamber. The coating on the skirts is an anti-friction coating.
Should have the SVT back next few days.



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Old 08-23-2013, 09:47 PM   #13
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Pressed or floating pins?
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Old 08-23-2013, 10:20 PM   #14
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Just out of curiosity, what spark plugs where you running when this incident occurred? I have a buddy on the other forum with a thread about how the SVT can not use some plugs, as some SVT owners had similar experiences as you. He has a whole thread on it with great info on the other fourm. Let me know If you want me to pm you a link to his thread.
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Old 08-23-2013, 10:29 PM   #15
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^You have friends.



THIS IS NEWS!
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Old 08-23-2013, 10:34 PM   #16
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Floating piston pins and the shop clearanced the pins.

Was and will still use factory OEM spark plugs. I never had a problem with them.
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Old 08-23-2013, 10:40 PM   #17
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I would go to the SP463 plugs they are colder then the stock plug and are much cheaper

If those are the SVT pistons that Diamond makes for the Eagle rods (didnt know of any for the stock SVT rod which is longer then the Zetec rod) then your pistons will come just above the deck of the block and compression will be very high , have you checked the compression height against the stock SVT piston , I think you will find them taller

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Old 08-23-2013, 10:42 PM   #18
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The floating pin and lack of oil is what worries me ...
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Old 08-23-2013, 10:50 PM   #19
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I've stated it a few times, I had these pistons custom made for stock SVTF rods. Same compression height as OEM. Deck height will be the same as OEM. The only difference is use of a more readily available 1mm top ring land so I can get rings from Total Seal which will be a barrel face top ring and napier face second ring. V-groove between the top and second ring. Also the crown was dished with a 8* taper instead of OEM 5* taper. Possibly a +1/4 point in compression. Piston / pin assembly is only about 14 grams lighter than OEM.
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Old 08-23-2013, 10:55 PM   #20
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Quote:
Originally Posted by iminhell View Post
The floating pin and lack of oil is what worries me ...
Why is a floating pin a problem and why would there be a lack of oil? A floating pin and a pressed pin get the same amount of oil, just the pin hole and pin have different clearances.
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