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Old 12-05-2012, 04:07 PM   #1 (permalink)
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Default what kind of pistons are these?

I can't tell if they are stockers or je 8.0s?
And what should the piston to wall clearance be, I can't find the specs. Thanks guys!

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Old 12-05-2012, 04:14 PM   #2 (permalink)
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look like je's they don't have the arrow or the dimple that stockers have have you pulled the pan to see if there is aftermarket rods?
they also have a more brushed finish than stockers which look almost polished when clean
they also look like they are over sized the dome on stockers extends to the edge of the piston wall

Last edited by loroku; 12-05-2012 at 04:19 PM.
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Old 12-05-2012, 05:01 PM   #3 (permalink)
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I had the pan pulled a few months ago to do my windage tray and bshaft delete, didn't see anything obvious, but I wasent sure what to look for and oil kept dripping on me...
The car and motor was from a garage that use to race it. They said they rebuilt it before they sold it to my friend(who I bought the car from). So I'm guessing it was overbored. But when I push on the pistons they have a lot of play, but I had perfect compression and perfect 23in/mg vacuum. also didn't smoke untill I blew the turbo up.

Thanks for the response
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Old 12-05-2012, 11:01 PM   #4 (permalink)
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can you check the size of the bore?
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Old 12-06-2012, 10:41 AM   #5 (permalink)
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Haven't been able to get back out to the garage yet. Ill take my dial bore gauge out tonight.
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Old 12-06-2012, 11:02 AM   #6 (permalink)
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A "lot" of play isn't that unusual. Keep in mind that you "lot" and my "lot" is subjective solely based on opinion. I thought my engine had a lot of play with .020 Wisecos. It was definitely in spec. Just felt weird when pushing the piston around.

Moral of the story, when in doubt measure it!
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Old 12-06-2012, 12:13 PM   #7 (permalink)
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I'm trying to measure but I can't find the spec anywhere! I saw .040" for wiescos in one thread.

Pulled the valves today, trying to figure out if they are oversized or not. They are tripple keepers, but I know a few company's do it tripple.
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Old 12-06-2012, 02:52 PM   #8 (permalink)
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that exhaust valve looks horrible intake might be the the exhaust is defiantly stock sized
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Old 12-06-2012, 09:02 PM   #9 (permalink)
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Exhaust isent that bad, seen worse, my friends subaru was caked in white carbon lol. The head was rebuilt I can tell, it seals way to well to be a stock head, but its stock. I finally found a picture online of the stock valves. Glad I get to improve something! Just found a ACT XTD 6puck sitting in my bellhousing. Todays been a good day.

Anybody know much it cost to get a head machined for oversized valves?
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Old 12-07-2012, 02:24 AM   #10 (permalink)
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they look like metal ones, but dont quote me.
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Old 12-07-2012, 12:14 PM   #11 (permalink)
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If you can pull the pan and take a look, the inside of the skirts should be marked IIRC.

Looser tolerances with Forged slugs is perfectly normal as to allow for their increased expansion compared to cast.

(Side note on that, I once almost nabbed a perfectly healthy Talon GSI for pocket change. It's owner didn't know it had a forged bottom end and that the "knock" he was horrified by when cold was just piston slap... lolololol.)
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Old 12-07-2012, 02:20 PM   #12 (permalink)
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um ik my local guy does it for $200 for valves call up SI valves out of california i think i got os valves for my early style head for $150(im a 1gener)
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Old 12-08-2012, 08:07 AM   #13 (permalink)
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Quote: Originally Posted by Bloo magoo View Post
they look like metal ones, but dont quote me.

Woops
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Old 12-08-2012, 08:17 AM   #14 (permalink)
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Quote: Originally Posted by loroku View Post
um ik my local guy does it for $200 for valves call up SI valves out of california i think i got os valves for my early style head for $150(im a 1gener)

Less than I expected, I called my machine shop and he gave me a run around about how he needed to have the head and new valves to see if it would fit, I'm like its a srt4 and everybody and their sister has oversized, give me a quote, well blahblah. I just told him ill go elsewhere.

I know the price of valves, ill just got with the rev ups on modernp.


And I'm waiting on a JE owner to comment with his spec clearance. I can't find it anywhere. I called je and they forwarded me to 2 people...
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