Volvo RWD 140-160 Forum

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Compression 140-160 1971

posted by rawits on Thu Sep 10 07:47 CST 2009
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last visit: Sun Aug 3 12:32 CST 2014

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Just some old info...Used 44 x 36 valves (SS) Chambers at 48cc , 0 deck, Elring gasket, ARP head studs.

Car doesn't idle well, and diesels on shutdown...I asked Dema Elgin about your chart, and here is his response:

Hello, The int closing point is about 70 degrees at the valve!!! You seem to have some sort of a tuning problem. 274 total duration with 108 lobe centers = 58 degrees of overlap at the CAM and timing of 29-65 at the cam. When the cam goes through the rocker arm the valve timing is increased!!! Make sure that you do not have the valve lash set too loose for that will affect the seat to seat timing. We have a lot of the 68.508-16 cams running on the street with NO problems. The 7-1 effective comp is with a int system that has no restrictions like what is on many high perf engines.For some reason people DO NOT understand that DYNAMIC comp is when the engine is producing max TQ not just calculated compression on the engine stand with the int valve closing. The tightest lash hot can be in the range of .012"-.014" and if you were to check to see when the int valve closed it would be past 70 degrees. Dema Elgin

HAVE YET TO READJUST VALVE LASH, INITIAL SETTING WAS .015 COLD

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Manifolds [140-160]
posted by rawits on Thu Aug 13 10:44 CST 2009 >

Manifolds [140-160]
posted by walrus3 subscriber on Thu Aug 13 11:38 CST 2009 > V
- Manifolds [140-160]
  posted by spectratone on Thu Sep 10 13:37 CST 2009 > V

Manifolds [140-160]
posted by someone claiming to be JIH on Thu Aug 13 17:20 CST 2009 > V
- Manifolds [140-160]
  posted by someone claiming to be B20Paul on Fri Aug 14 11:53 CST 2009 > V

Manifolds [140-160]
posted by someone claiming to be B20Paul on Fri Aug 14 11:52 CST 2009 > V
- Compression [140-160][1971]
  posted by rawits on Fri Aug 14 13:16 CST 2009 > V
  - Compression [140-160][1971]
    posted by B20Paul. subscriber on Sun Aug 16 10:09 CST 2009 > V
    - Compression [140-160][1971]
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      - Compression [140-160][1971]
        posted by B20Paul. subscriber on Thu Sep 10 11:34 CST 2009 > V
        
        Compression [140-160][1971]
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        Compression [140-160][1971]
        posted by B20Paul. subscriber on Thu Sep 10 14:44 CST 2009 > V
        
        Compression [140-160][1971]
        posted by rawits on Fri Sep 11 02:52 CST 2009 > V
        
        Compression [140-160][1971]
        posted by volvorelix on Fri Sep 11 06:53 CST 2009 > V
        
        123 ignition [140-160][1971]
        posted by B20Paul. subscriber on Fri Sep 11 19:32 CST 2009 > V
        
        Compression [140-160][1971]
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        Compression [140-160][1971]
        posted by someone claiming to be cdu on Fri Sep 11 07:03 CST 2009 > V
        
        CDU has given sage advice [140-160][1971]
        posted by B20Paul. subscriber on Fri Sep 11 18:59 CST 2009 > V
        
        Compression [140-160][1971]
        posted by rawits on Mon Sep 14 08:01 CST 2009 > V
        
        Compression [140-160][1971]
        posted by B20Paul. subscriber on Thu Sep 24 21:16 CST 2009 > V
        
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        Compression [140-160][1971]
        posted by B20Paul. subscriber on Sat Sep 26 03:59 CST 2009 > V
        
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        posted by rawits on Sun Sep 27 07:49 CST 2009 > V
        
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        Compression [140-160][1971]
        posted by rawits on Sun Sep 27 13:46 CST 2009 > V
        
        Compression [140-160][1971]
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        Compression [140-160][1971]
        posted by rawits on Tue Oct 20 13:09 CST 2009 > V
        
        Compression [140-160][1971]
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        Compression [140-160][1971]
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        Compression [140-160][1971]
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        Compression [140-160][1971]
        posted by B20Paul. subscriber on Fri Oct 30 06:50 CST 2009 > V
        
        Compression [140-160][1971]
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        Compression [140-160][1971]
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Compression 140-160 1971