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B20E Head height 140-160

posted by Gary L on Mon Aug 8 05:39 CST 2005
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last visit: Wed Oct 22 10:26 CST 2014

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- quote - "You're in no danger of hitting the valves, and shaving the head won't cause any problem there."

I don't understand... the clearance between the valve head and the piston is directly affected by head height... the more I shave the head, the closer to the piston the valves become. I don't see how it can avoid becoming a valve-to-piston clearance problem at some point.

- quote - "So, you have a zero deck and .030" gasket (is that what it crushes to?), so you have .030:piston-to-head clearance. I usually consider .032" the safe minimum for Mahle pistons on stock rods that have been rebuilt for absolutely even length and then shot-peened to stay that way, for a motor that will see 7000 RPM (forged pistons need more clearance than that). You're pushing it, I'd say..."

Yes, the head gasket crushes to about .030". And I agree I'm pushing it, but the only time I've had a problem was with a badly over-revved (stretched) rod. (There are pictures of that particular failure in the technical area of the Brickboard gallery.) FWIW, I normally stay below 7000, with the shift light set to go off at 6700. However... downshifts can sometimes be a problem. ;)

- quote - "I thought ITB required stock compression ratio -- ???"

Actually, IT rules allow half a point above stock CR, so I can legally go to 11.0.

--
1971 142E ITB racer, 1973 1800ES, 2002 S60 T5

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B20E Head height [140-160]
posted by Gary L subscriber on Mon Aug 8 04:23 CST 2005 >

B20E Head height [140-160]
posted by Phil S. on Mon Aug 8 04:46 CST 2005 > V
- B20E Head height [140-160]
  posted by CyaLater on Mon Aug 8 05:33 CST 2005 > V
  - B20E Head height [140-160]
    posted by Gary L subscriber on Mon Aug 8 05:54 CST 2005 > V
- B20E Head height [140-160]
  posted by Gary L subscriber on Mon Aug 8 05:39 CST 2005 > V
  - B20E Head height [140-160]
    posted by CyaLater on Mon Aug 8 06:17 CST 2005 > V
    - B20E Head height [140-160]
      posted by Gary L subscriber on Mon Aug 8 11:52 CST 2005 > V
      - B20E Head height [140-160]
        posted by CyaLater on Mon Aug 8 22:25 CST 2005 > V
        
        B20E Head height [140-160]
        posted by Gary L subscriber on Tue Aug 9 00:20 CST 2005 > V
        
        B20E Head height [140-160]
        posted by CyaLater on Tue Aug 9 03:25 CST 2005 > V
  - B20E Head height [140-160]
    posted by Phil S. on Mon Aug 8 08:23 CST 2005 > V
    - B20E Head height [140-160]
      posted by Gary L subscriber on Mon Aug 8 11:48 CST 2005 > V
      - B20E Head height [140-160]
        posted by Phil S. on Mon Aug 8 12:18 CST 2005 > V
- Shot Peening theory (long - sorry!) [140-160]
  posted by walrus3 subscriber on Mon Aug 8 09:00 CST 2005 > V
  - Excellent! [140-160]
    posted by Phil S. on Mon Aug 8 10:57 CST 2005 > V
    - Still more..... [140-160]
      posted by walrus3 subscriber on Mon Aug 8 14:44 CST 2005 > V
  - Shot Peening theory (long - sorry!) [140-160]
    posted by Gary L subscriber on Mon Aug 8 14:10 CST 2005 > V
    - Shot Peening theory (long - sorry!) [140-160]
      posted by walrus3 subscriber on Mon Aug 8 14:21 CST 2005 > V

B20E Head height [140-160]
posted by blackjackmc on Mon Aug 8 13:03 CST 2005 > V

Actually... [140-160]
posted by CyaLater on Mon Aug 8 22:59 CST 2005 > V
- Actually... [140-160]
  posted by Gary L subscriber on Mon Aug 8 23:57 CST 2005 > V
  - Actually... [140-160]
    posted by CyaLater on Tue Aug 9 03:13 CST 2005 > V

And the CR is..... [140-160]
posted by Gary L subscriber on Tue Aug 9 13:29 CST 2005 > V
- And the CR is..... [140-160]
  posted by Phil S. on Tue Aug 9 13:50 CST 2005 > V
  - And the CR is..... [140-160]
    posted by Gary L subscriber on Tue Aug 9 14:57 CST 2005 > V
    - And the CR is..... [140-160]
      posted by CyaLater on Tue Aug 9 17:57 CST 2005 > V
    - And the CR is..... [140-160]
      posted by Phil S. on Wed Aug 10 06:43 CST 2005 > V
      - And the CR is..... [140-160]
        posted by Gary L subscriber on Wed Aug 10 13:18 CST 2005 > V
      - And the CR is..... [140-160]
        posted by jparker3 on Thu Aug 11 09:33 CST 2005 > V

B20E Head height [140-160]
posted by jparker3 on Thu Aug 11 09:48 CST 2005 > V
- Too True. [140-160]
  posted by CyaLater on Thu Aug 11 20:13 CST 2005 > V
  - Too True. [140-160]
    posted by jparker3 on Fri Aug 12 02:27 CST 2005 > V
  - My apologies to all [140-160]
    posted by Gary L subscriber on Fri Aug 12 02:30 CST 2005 > V
    - My apologies to all [140-160]
      posted by CyaLater on Mon Aug 15 01:26 CST 2005 > V
      - It's running, but.... [140-160]
        posted by Gary L subscriber on Mon Aug 15 03:32 CST 2005 > V

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Volvo RWD 140-160 Forum

B20E Head height 140-160