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| Cam timing https://slantsix.org/forum/viewtopic.php?t=59750 |
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| Author: | 1966Safari [ Wed Jun 08, 2016 10:20 pm ] |
| Post subject: | Cam timing |
Hi All, long time reader first time poster. Re building my 225 slant and was degreeing in the camshaft a 264S Comp Cam and had to have it set on the 8 degree advance keyway to get the recommended 106 degree intake lob centre. Am I missing something or can this happen. Using a JP timing set. Checked TDC and re measured a couple of times. Thanks for any advice. Craig |
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| Author: | Charrlie_S [ Thu Jun 09, 2016 3:52 am ] |
| Post subject: | |
This is a perfect example of why to degree any cam installation, and not just go "dot to dot". |
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| Author: | 1966Safari [ Thu Jun 09, 2016 3:26 pm ] |
| Post subject: | |
Hi Charrlie, I take it with your experience you have witnessed loose tolerances with aftermarket parts which could throw out cam timing by 8 degrees. I have only degreed a few cams and have had two degrees out at worst. Cheers Craig |
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| Author: | Charrlie_S [ Thu Jun 09, 2016 7:30 pm ] |
| Post subject: | |
I had one cam and timing set combination, that was so far out, I had to actually "jump" the sprocket one tooth, then use a cam bushing to go back the other way. It was so far out at "dot to dot, the most offset bushing could not correct the problem. |
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| Author: | Rick Covalt [ Thu Jun 09, 2016 7:44 pm ] |
| Post subject: | |
Ditto to what Charlie said! i have had to move them a tooth as well. |
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| Author: | SlantSteve [ Fri Jun 10, 2016 1:27 am ] |
| Post subject: | |
I cant remember exactly what the last one was but to was off a fair bit...I think 6 degrees using a roll master timing set. That being said double check your figures to be certain!! Some grinders give a lobe lift figure at TDC which isn't a bad way to confirm all is correct,or use the lobe centre method, find that a bit easier than doing .050" figures or even worse advertised figures . |
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| Author: | slantzilla [ Fri Jun 10, 2016 9:33 am ] |
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I've had the old Mopar Performance chains off a full tooth also. |
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| Author: | ProCycle [ Fri Jun 10, 2016 8:16 pm ] |
| Post subject: | |
You are taking your measurements off the lifter, right? I've degreed lots of cams but all were on motorcycles where you use actual valve timing measured by lift at the valve. When I tried to do my slant 6 that way I was convinced my cam was screwed up. Timing was way off, duration and lobe separation too. Nothing came out right until I learned that slant cam timing is checked at the lifter. |
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| Author: | Will [ Sat Jun 11, 2016 2:55 am ] |
| Post subject: | |
The last comp. Cam I did needed 9 degree offset. Will |
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