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| Where to Degree Stock Cam? https://slantsix.org/forum/viewtopic.php?t=3630 |
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| Author: | Mitch [ Fri May 17, 2002 6:23 am ] |
| Post subject: | Where to Degree Stock Cam? |
I am looking at the valve timing events in the shop manual. They are: Intake opens 16 degrees BTDC Intake closes 48 degrees ABDC Exhaust opens 54 degrees BBDC Exhaust closes 10 degrees ATDC Going by these numbers, the intake/exhaust centerlines are 106/112 respectively. This means the cam is advanced 3 degrees. Is this advance ground into the cam or is it in the timing gear(s)? Going by the specs, I would like to install this cam with 2 or 4 degrees advance, but I need to know how the cam is ground. Has anyone ever degreed the factory 244/244 cam? What did you find? Thanks Mitch m5black@aol.com |
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| Author: | Gearhead [ Fri May 17, 2002 9:18 pm ] |
| Post subject: | Re: Where to Degree Stock Cam? |
Quote:
: I am looking at the valve timing events in the : shop manual. They are: Intake opens 16 : degrees BTDC : Intake closes 48 degrees ABDC : Exhaust opens 54 degrees BBDC : Exhaust closes 10 degrees ATDC : : Going by these numbers, the intake/exhaust : centerlines are 106/112 respectively. This : means the cam is advanced 3 degrees. Is this : advance ground into the cam or is it in the : timing gear(s)? Going by the specs, I would : like to install this cam with 2 or 4 degrees : advance, but I need to know how the cam is : ground. Has anyone ever degreed the factory : 244/244 cam? What did you find? : : Thanks : : Mitch Well, you understand your cam numbers...I did the math and came up with a lobe separation of 109...and according to the specs in your table, the installed IC would be 106...providing an advance of 3 degrees, as you stated. I have no idea whether the factory grinds this into the cam or the gears. The only way to know is to degree the cam. After all, are the aftermarket gears going to be ordered based on the cam selection...no. All the timing gears will be ground the same so they can be interchanged...or at least...all aftermarket ones will be. My guess is its in the cam. But you must degree it to know. The cam could be a replacement grind...did the company grind in the factory advance? Did the guy who ground the cam go drinking the night before? Get out your degree wheel...its the only way. Why bother measuring anything in an engine, if you trust the cam to be correct, or the engineers to make smart decisions based on performance and efficiency...as oppossed to bean counter mandates. I have to say though, that in this case the factory specs look decent as per application...so just making sure it measures out should be enough. Karl gearhead@spiritone.com |
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