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911 Valve Timing
Putting a 2.2T "911-07" back together. Trying to dial in the valve timing. Haynes manual say's the dial gauge reading should be 3.0 to 3.3 mm. Sure enough, I roll it over 360 and it comes out exactly 3.15mm without any adjustments. Problem is, the Dempsey book says that 3.15mm would match up with an "E" Cam.
My gut tells me to let it go without trying to manipulate it to match Dempsey's "T" specs?????? |
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06-08-2011, 06:21 PM
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Join Date: Nov 2010
Location: SoCal
Posts: 759
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Don,
Are you certain you have "T" camshafts? What are the billet numbers cast into the cam, between the lobes? For a 911/07 engine, they should be 901.105.133.OR and 901.105.134.OR. Is anything stamped on either end of the cam? For stock "T" camshafts in a 911/07 engine, intake valve lift at overlap TC with 0.1mm valve lash is set at 2.30-2.70mm.
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Jon B. Vista, CA |
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06-08-2011, 10:14 PM
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I dont know about the early ones, but cant see why they are different. From what you have written it looks like you have torn the engine/cam timing down. In which case where it goes back as far as timing is pretty arbitrary until you specifically tweek it. So whatever you got initially is more luck than anything. Then you tweek it to the specs - whatever they are.
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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06-09-2011, 12:41 AM
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The dial indicator is reading the cut on the cam not the degrees off TDC right? If the Crank starts off at the "x" marking and the cam starts with the keyway straight up, it should be within a couple degrees of correct shouldn't it?????
Last edited by Don Jones; 06-09-2011 at 04:36 AM.. |
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06-09-2011, 02:55 AM
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I pulled the heads off as an assembly and so I never saw the part number on the cams. I'm just doing Rings and Gaskets. No signs that the engine had been apart before but I'll call the original owner to make sure.
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06-09-2011, 03:24 AM
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OK, the dial indicator will give me the Lift of the intake lobe which I can cross reference in the Dempsey Book, right? I'm still concerned about the Haynes 901-07 vs. the Dempsey "T" specs.
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06-09-2011, 04:40 AM
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Location: SoCal
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Quote:
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Jon B. Vista, CA |
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06-09-2011, 08:09 AM
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There lies the problem! I read that 901 and 911 part number prefixes were used interchangeably in the early years.
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06-09-2011, 09:22 AM
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Join Date: May 2003
Posts: 3,346
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The dial indicator gives you the cam timing as well as the cam lift. The two effect each other. You can't time the cams until you know what cams you have.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-09-2011, 09:28 AM
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