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Buying a 91 3.3 Turbo, need advice

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Old 05-23-2012, 06:41 AM
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NJPhoto
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Originally Posted by Frank 993 C4S
That's pretty vague. Leak down results are usually expressed in %.
Yeah that's what I was expecting.

So I decided to bite the bullet today and put down a deposit. Hopefully pick it up next week, then a 500 mile trip home to get acquainted
Old 05-23-2012, 06:56 AM
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Sharker
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Strap in and enjoy the ride.. Grats on the pending purchase
Old 05-23-2012, 03:22 PM
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ralt
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Agree with Frank993 c4s, they should give you numbers. With compression, all six cyl should be close be high or low. Ie its better to have 6 at 115 than 5 at 130 and one at 110. On leak down 5% or less on each. again, even is better
Old 05-23-2012, 03:27 PM
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ralt
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For some reason when I posted a note in reply it went to another thread. So start again, Compression numbers should be even or close be they high or low. all 6 at 115 is better than 5 at 130 and one at 110.
On leak down you want 5% or better on all 6. Again even is better.
Old 05-23-2012, 09:23 PM
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Once I get the car it wont be long before its up at a Porsche specialist in Brisbane getting a proper look over and some freshening up. The owner told me he had put 5000km on the car in 6 years, so im guessing most of the leaks are dried up seals. Because the car is an import its value wont hold like an Australian delivered model so I am not too concerned about keeping it as stock as possible (it already has coilover suspension and a RUF exhaust), so a 3.6 motor swap might be in the cards if its current motor gives out.

Thanks for all the input guys, it has been very helpful. Now your going to have to put up with a lot of newbie 911 owner questions! I already have a decent list of parts ready to be ordered and I am looking forward to spending many hours getting the car back into A1 condition.
Old 05-24-2012, 12:16 PM
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JBurer
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Originally Posted by ralt
Agree with Frank993 c4s, they should give you numbers. With compression, all six cyl should be close be high or low. Ie its better to have 6 at 115 than 5 at 130 and one at 110. On leak down 5% or less on each. again, even is better
Agree with the first comment regarding compression being consitent across cylinders, the second needs to be qualified, however.

On a cold motor, leakdown of > 20% on a 3.3 Turbo motor is what FBR considers to be rebuild time. Got the impression from talking to them that an average motor was in the 10% range when tested cold.
Old 06-24-2012, 06:45 PM
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Not much of a PPI. Minimum they should do a compression check although leak down is preferable. Have the engine washed down and see where the new oil drips from.
Old 06-24-2012, 06:53 PM
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theporscheguy
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Did you follow through with the purchase and drive it home? If so, how did the 500 mile drive go?
Old 06-24-2012, 09:18 PM
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Originally Posted by theporscheguy
Did you follow through with the purchase and drive it home? If so, how did the 500 mile drive go?
Yes I did, Made it home without any issues. You can check it out here.....
https://rennlist.com/forums/964-turb...-new-ride.html



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