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Cams timing questions !
Hello !
I am not sure about my process ! I try to do the timing like the Wayne book explaine but I think I mist some thing about it ( my understanding of english ), My cams is Solex cams and my engine is 2.7 L with RS pistons. my setting cams is 4.3 mm. whe I turn the cam with the tool the pîn off the valve touch the piston before I can read 4.3 mm on the dial, where is my problem ? Ray
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! Last edited by Raynald; 03-01-2005 at 11:37 AM.. |
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03-01-2005, 08:04 AM
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Hello
I recheck tonight and I have 4.3mm at Z1 after a 720 turn and install my rocker of exhaust adjust the valve and when I rotate slowly the crankshaft for testing the exhaust valve touch the piston... what is wrong ? Ray
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! |
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03-01-2005, 06:31 PM
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You started at cylinder #1 at Z1 firing position, and then turned 360deg to Z1 cylinder #1 overlap to set #1 cam timing correct ?
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-01-2005, 11:36 PM
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Yes, RoninLB
This is my process ! The cam is in good side and piston in good position... High-lift, high-duration Camshaft Timing left side 1. Line up crank @ Z1. 2. Clamp tensioner idler arm. 3. Dot on left and right hand cam in up position. 4. Install rocker arm #1. 5. Adjust valve .10mm (.004 in) 6. Attach dial indicator to #1 (depressed at least .4 in) 7. Install small dowel pin into obvious hole. 8. Tighten camshaft nut to final torque 110 lb/in. 9. Rotate crank 360° lining up Z1 mark. (note how far dial gauge moves). Camshaft should have rotated 180°. 10. Hold cam securely w/camshaft tool and remove nut with crows foot. 11. Remove dowel pin. 12. Rotate cam until valve overlap is reached. (Solex cams ) .17 inch nominal or 4.3mm. 13. Replace pin. 14. Rock the camshaft back and forth to check backlash. 15. Hold camshaft and tighten nut. 16. Rotate crank 720° Z1 should be lined up. Indicator should be in range. all is done and i begin to adjust exhaust valve #1 and I rotated for the next and check for 720° and the valve touch the piston... I don't know what I do wrong but some thing i mist... it is new cams with new pistons (RS)... Thanks Ray
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! |
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03-02-2005, 05:54 AM
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Technique sounds correct to me. You may want to post this on the Engine Rebuild Forum.
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Walt 82SC 3.0 81SC 3.6 |
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03-02-2005, 03:42 PM
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Hello Walt !
Is this possible for a not good overlap mesure ? Raynald
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! |
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03-02-2005, 05:51 PM
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Do you have only the number 1 intake rocker installed?
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Walt 82SC 3.0 81SC 3.6 |
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03-02-2005, 08:16 PM
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Hi Raynald,
Are you sure you have the left cam in the left position and the right on the right side? Waynes book has a diagram showing which cam is left and which one is right. The RS pistons should clear the Solex cams without a problem, are you positive they are RS pistons?
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John Dougherty Dougherty Racing Cams |
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03-02-2005, 08:51 PM
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I can't think of hard answer. Is it a possibility that the pistons are installed wrong ?
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-02-2005, 09:16 PM
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Hello Guys
Yes the pistons is in the good position and the cams is in the good side I double check ! I have the wayne book and the Bruce Anderson book for reference, Raynald
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! |
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03-03-2005, 05:22 AM
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Pistons
Hello Again !
This is my pistons position .  Ray
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! Last edited by Raynald; 03-03-2005 at 05:39 AM.. |
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03-03-2005, 05:28 AM
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Re: Pistons
Quote:
looks good to me. Here's mine. 
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-03-2005, 05:53 AM
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Hello Guys
I am right now.... This is important to have a dial! but it is better to know how it work ... I don't take the good scale on it ! 0.17 inch.: is one total turn plus .7 more... I am OK at Z1 and all my valve adjusment is done whitout touch ! Thanks for your Help All. Raynald
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1960 356 BT-5 Aetna blue 1973 911 RS récréation 1960 VW panel Dove blue 1971 914 barn find ! |
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03-03-2005, 08:36 AM
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