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It's a trap...
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Compression and leak down numbers - look good?
Hello all, I just wanted to give an update on my rebuild that I was fortunate enough to have had this board to help me through. I got my compression and leak down test results back and they look pretty good to me. Do these numbers look good to you?
Compression and leak down test results. Compression 3. 155 psi 6. 160 psi 2. 160 psi 5. 150 psi 1. 160 psi 4. 160 psi Leak down 3. 0.0% 6. 1.0% 2. 2.5% 5. 1.0% 1. 2.0% 4. 1.0% 
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Run like the wind, straining the limits of machine and man.... 2006 Atlas Gray Carrera 4, '81 911SC Black on Tan (SOLD), 2006 Acura RSX Type S, '13 Dodge Durango (wifeys). |
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05-28-2016, 09:35 AM
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I Wonder
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Readings like that for leakdown dont get any better. Are you sure #3 isn't seized. Ha Ha. Thanks Rob
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05-28-2016, 09:47 AM
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It's a trap...
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I'm pretty pleased. I would not even have began to think about doing the rebuild myself without this board and Wayne's book.
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Run like the wind, straining the limits of machine and man.... 2006 Atlas Gray Carrera 4, '81 911SC Black on Tan (SOLD), 2006 Acura RSX Type S, '13 Dodge Durango (wifeys). |
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05-28-2016, 05:35 PM
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Member 911 Anonymous
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Any numbers prior to?
Heck under 10% of each other is pretty damn good ��
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-28-2016, 06:46 PM
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dmart2rp
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Did you rebuild using Alusil cylinders?
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05-30-2016, 08:10 AM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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Never seen 0 leakdown.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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05-31-2016, 04:24 AM
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Registered
Join Date: Jan 2015
Posts: 1,499
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Check calibration of leakdown tester gauges. In any event they are great but 0 is impossible.
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05-31-2016, 05:03 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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Quote:
I built 100's of bearing housings for jet engines that used a piston ring with an overlapping gap like TotalSeal rings. Never had one show zero |
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05-31-2016, 05:43 AM
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Registered
Join Date: Jan 2015
Posts: 1,499
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Yes, the gauges have to be calibrated to read exactly the same for a given test psig to give an accurate leakdown %.
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05-31-2016, 06:24 AM
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Member 911 Anonymous
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Quote:
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-31-2016, 11:43 AM
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It's a trap...
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I'll call the shop that did these. Should I be suspect of the other number?
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Run like the wind, straining the limits of machine and man.... 2006 Atlas Gray Carrera 4, '81 911SC Black on Tan (SOLD), 2006 Acura RSX Type S, '13 Dodge Durango (wifeys). |
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06-02-2016, 05:40 AM
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Member 911 Anonymous
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You can rent for free a Compression tester from your FLAPS and verify for yourself, just remember to pull the DME relay or pull Fuel Pump Fuse.
I bet those leak down numbers are the percentage of difference between them and he used #3 as a base line.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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06-02-2016, 09:56 AM
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Speed Buggy
Marble Grey
1983 porsche 911 sc, sunroof coupe
