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Join Date: Jul 2009
Location: Ontario
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pressure test engine
I was out driving today, and noticed a vacuum leak... no pressure on the tell tale gauge, so I hooked up the compressor and pressurized the engine, and found leaks at the turbo flange/gasket, slip joint, and throttle body. I think most of the loss of pressure must be from the turbo gasket. Hard to believe that these 3 leaks would leak all of the positive pressure... Another thing that I didn't realize was that I had to test through exhaust end, and intake end. Must be the turbo that wouldn't let the pressure through. Philip
     
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87 930 GHL/Rarlyl8/Garretson/GT3582R/1 Bar/Wevo shift, mounts/Meth inj/LM-2/Custom Fuchs/Carrera intake manifold/Xtreme Carrera heads P&P/3.4/DR 993SS cams/ Mahl/Pauter/JE/Niresist/ARP/twin COP/8.25:1/KEP stage 2/twin tials/close 2,3,4th. MS3Pro Evo  500+ HP, BTSOMP Dyno
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07-07-2018, 11:51 AM
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and the slip joint... any one put a clamp on this? or will it seal up when the exhaust get hot...
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87 930 GHL/Rarlyl8/Garretson/GT3582R/1 Bar/Wevo shift, mounts/Meth inj/LM-2/Custom Fuchs/Carrera intake manifold/Xtreme Carrera heads P&P/3.4/DR 993SS cams/ Mahl/Pauter/JE/Niresist/ARP/twin COP/8.25:1/KEP stage 2/twin tials/close 2,3,4th. MS3Pro Evo 500+ HP, BTSOMP Dyno
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07-07-2018, 11:55 AM
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A small amount of leakage in the exhaust is not a problem - the exhaust side operates under very small pressure (not 1 bar). The small leakage at slip joints is a small %age of exhaust gas that is not driving the turbo.
You can do it all thru the intake side. Remember, you may have some valves on overlap somewhere, unless you bring the engine rotation to just before a TDC mark (about 15 deg). At TDC you are 1-2mm open on inlet (and exhaust)somewhere. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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07-07-2018, 06:42 PM
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Those slip joints should seal up with heat. Not sure what headers you have. (Rarlyl8 ?) One of the things I like about the B&B headers is the double slip joint. Smart use of the fuel filter
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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07-07-2018, 08:40 PM
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i had leaks around my TB, mainly the shaft.
no boost pressure? did it drive like it had no boost pressure? check the Orings on the IC. check WG turbo seized
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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07-09-2018, 08:52 AM
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That throttle body o-ring looks like it's pushed out. Shouldn't be visible.
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Chris Carroll TurboKraft, Inc. Tel. 480.969.0911 email: info@turbokraft.com http://www.facebook.com/TurboKraft - http://www.instagram.com/TurboKraft |
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07-09-2018, 09:05 AM
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Quote:
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87 930 GHL/Rarlyl8/Garretson/GT3582R/1 Bar/Wevo shift, mounts/Meth inj/LM-2/Custom Fuchs/Carrera intake manifold/Xtreme Carrera heads P&P/3.4/DR 993SS cams/ Mahl/Pauter/JE/Niresist/ARP/twin COP/8.25:1/KEP stage 2/twin tials/close 2,3,4th. MS3Pro Evo 500+ HP, BTSOMP Dyno
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07-09-2018, 10:42 AM
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Copy that, thanks for the explanation.
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Chris Carroll TurboKraft, Inc. Tel. 480.969.0911 email: info@turbokraft.com http://www.facebook.com/TurboKraft - http://www.instagram.com/TurboKraft |
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07-09-2018, 11:50 AM
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