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Old 02-03-2008, 05:21 AM   #1
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Anyone using Wossner pistons in 9K?

Ive heard JE pistons might clack or make noise (even if fitted correctly) anyone hear anything about Wossner or currently running them- in a 9K. A friend of mine is running them in his MY Viggen. Quietest engine Ive heard.
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Old 02-03-2008, 05:54 AM   #2
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I have them in my 9-5 super wuitet but anohter guy has them in his viggen and they clack a bit when cold for a few seconds or a minitue or two til warm especially when cold out...
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Old 02-03-2008, 06:11 AM   #3
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Do you think that is a common issue with aftermarket pistons? (the clack?). As longs as you don't get clack when its warm I suppose? Are you running the JE or Wossner
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Old 02-03-2008, 06:46 AM   #4
 
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Do you think that is a common issue with aftermarket pistons? (the clack?). As longs as you don't get clack when its warm I suppose? Are you running the JE or Wossner

The "clack" you're describing is attributed to slight piston slap of a cold engine. That's common to most forged pistons when they're cold, which should just serve as a reminder to let the car warm up slightly before beating on it...

But you really don't need forged pistons with a 9000 unless you're planning to run huge boost, or if your original pistons fail....
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Old 02-03-2008, 07:28 AM   #5
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Im rebuilding an engine at the moment. Looking for 350-375hp range. Having short block rebuilt and head done along with lots of other things. I predict boost from 20+? depending on tuner. I want to stick with SQR.
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Old 02-03-2008, 07:45 AM   #6
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well Kaylan has 476whp on stock internals, just to give you an idea how tough that engine is.
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Old 02-03-2008, 07:50 AM   #7
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no clacking of pistons in my 9-5. very happy with the JE's so far.
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Old 02-03-2008, 08:12 AM   #8
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well Kaylan has 476whp on stock internals, just to give you an idea how tough that engine is.
I believe she has less than 1000 miles on the motor with that amount of power, so that really says nothing.
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Old 02-03-2008, 08:26 AM   #9
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Last time I talked to him, Terry from NC said he was still on stock pistons (at 400whp).
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Old 02-03-2008, 11:40 AM   #10
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forged pistons are small when cold, so when running lots of power which makes alot of heat, they can expand without blowing up. thats why race cars smoke and sound like crap when they are cold.
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can i get enough boost to put the head into the hood??
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Old 02-03-2008, 01:37 PM   #11
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I believe she has less than 1000 miles on the motor with that amount of power, so that really says nothing.
Im not the only person to ever do this with a 9k motor... just the only one in the US. (that posts on teh interwebz*)
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Old 02-03-2008, 02:50 PM   #12
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Im not saying the stock components can't handle the power, just doing a rebuild and want to know what people are running. AeroDynamic: Did you use the original pistons in a rebuild (or did you rebuild)? I know of your car (its nasty by the way).
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Old 02-03-2008, 02:58 PM   #13
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Im not saying the stock components can't handle the power, just doing a rebuild and want to know what people are running. AeroDynamic: Did you use the original pistons in a rebuild (or did you rebuild)? I know of your car (its nasty by the way).
Nope everythings stock and never been rebuilt. Blew the first head gasket last month and replaced it with stock.
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Old 02-04-2008, 06:55 AM   #14
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Im not the only person to ever do this with a 9k motor... just the only one in the US. (that posts on teh interwebz*)
Oh, I know

I'm just pointing out that your car was used as a reference that the motor can handle it safely, but with very little milage I don't think your car is a good example of longevity (yet) because of how few miles you have put on (thus far).

I'm not insulting you, so don't take it down that road

Just put some miles on that thing!
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Old 02-04-2008, 08:37 AM   #15
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Just put some miles on that thing!
Soon.
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Old 02-05-2008, 11:02 AM   #16
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The "clack" you're describing is attributed to slight piston slap of a cold engine. That's common to most forged pistons when they're cold, which should just serve as a reminder to let the car warm up slightly before beating on it...

But you really don't need forged pistons with a 9000 unless you're planning to run huge boost, or if your original pistons fail....
I get some light clacking when the motor first starts especially when its 0-20F and then it goes away as it warms up. I run the je forged pistons with the coatings on the top and sides.

You should be perfectly fine with stock pistons up to about 450bhp.

I did break some, but I was drag racing it with 30psi and mixed nitromethane with my w/m injection. It was a power-house and I now suspect my stock fuel pump was not up to the task. After installing my walbro 255 fuel pump, my a/f dropped a half a point and it went from 11.0/1 to 10.5/1 past 5500rpm with 27psi of boost.

John
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Old 02-05-2008, 12:37 PM   #17
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When I rebuilt the engine at 200,000 miles one consideration was to go to forged pistons
however the prospect of increased clearances ,worse oil consumption and a re-build at 50 k put me right off
so changed the rings deglazed the bores and ....well nothing else
60k running at 400 hp + I think I have proved the longeivety...
still using no oil between services (apart for gearbox oil which likes to spread itself on the floor every few thousand miles)
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Old 02-05-2008, 09:27 PM   #18
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HHHMMM, I thought you can make you're end gap pretty darn tight and with something like total seal rings, the blowbye is very minimal if the motor is set up tight. The min for my set-up was .015", Turbo charged .017-.022" then nitrous at .022-.024"

These end gap settings of the compression rings and oil rings would determine the amount of oil blow*bye I would think.

The saab oe ring specs are around .021" I think, that might let some bye, but my motor is not using hardly any oil at all.... Forged JE with .017" for gt3071 and 400+bhp

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