Another leakdown and compressiok test question
05-25-2018, 07:21 PM
#1
Race Car
Thread Starter
Another leakdown and compressiok test question
Did test on a 1995 993 with 177000km(110k miles)
993 leakdown test; all cylinders 2-4% except cyl 3. It's 9%. .
Compression is all within 10% of each other. Average 175psi
Your expertise please
Thx
993 leakdown test; all cylinders 2-4% except cyl 3. It's 9%. .
Compression is all within 10% of each other. Average 175psi
Your expertise please
Thx
05-27-2018, 08:13 AM
#4
They look good numbers. My understanding is anything below 15% is fine. Above 20% start thinking about a rebuild.
My car is currently having a 3.8 build. Cylinder #5 had 80% leakdown and the car was still running strong.
My car is currently having a 3.8 build. Cylinder #5 had 80% leakdown and the car was still running strong.
05-27-2018, 04:12 PM
#6
Seb,
If the test was for a PPI, I would ask for the actual numbers on each cylinder!
If the test was for a PPI, I would ask for the actual numbers on each cylinder!
993 leakdown test; all cylinders 2-4% except cyl 3. It's 9%. .
Compression is all within 10% of each other. Average 175psi
Compression is all within 10% of each other. Average 175psi
05-27-2018, 08:34 PM
#7
Race Car
Thread Starter
Originally Posted by nine9six
Seb,
If the test was for a PPI, I would ask for the actual numbers on each cylinder!
If the test was for a PPI, I would ask for the actual numbers on each cylinder!
You mean compression numbers?
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05-28-2018, 12:00 PM
#8
Race Director
9% leakdown is not great. Could be a valve guide, could be some carbon on a seat (although I doubt it). That said, my car had one cylinder at 8% and the car burns barely any oil, runs fine, good power, etc, so not a deal breaker. Could give you some ammuniition to lower price.
05-28-2018, 02:25 PM
#9
RL Technical Advisor
JMHO,
9% LD isn't a deal killer, especially when the other cylinders are excellent. I suspect a piece of carbon may be stuck on the valve seat and there are ways to dislodge that.
9% LD isn't a deal killer, especially when the other cylinders are excellent. I suspect a piece of carbon may be stuck on the valve seat and there are ways to dislodge that.
05-28-2018, 06:52 PM
#10
Either flat bed Your car and have the engine rebuilt or drive the hell out of it for like ten Years and rebuild it after that or drive it for a furter ten Years!
I just drive My 993 and never do a leak down test, as long as it drives OK I just keep driving it!
I just drive My 993 and never do a leak down test, as long as it drives OK I just keep driving it!