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Author Topic: newbie cam degree'ing question JoeT ¯ Member # 298 posted                                 ok, so I understand with Anderson cams you do the 'intake centerline' degree'ing method. However, I don't seem to have some critical info such as the valve events (intake open/close, exhaust open/close). All I have is this crappy card: also, here's my setup. I've got TDC of #1 down pretty well and my timing chain is more or less dot-dot perfectly at TDC (would like to check valve events now). any pointers? thanks -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : AaronC ¯ Member # 86 posted                              The valve events on that cam are: INTAKE: OPEN; 1 BTDC CLOSE 41 ABDC EXHAUST: OPEN; 50 BBDC CLOSE: 5 ATDC Those are the events for the 110 ICL I'm sure Shaun will see this thread soon and fill you in on the exact process. I'm not familiar with it yet. [ December 29, 2002, 11:07 PM: Message edited by: AaronC ] -------------------- 1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers 12.23 at 112.99 Best MPH 113.97 Posts: 776 | From: woodland | Registered: Dec 2000  |  : JoeT ¯ Member # 298 posted                                 much thanks (where'd you get that info btw?) [ December 29, 2002, 11:06 PM: Message edited by: shade-tree ] -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : AaronC ¯ Member # 86 posted                              Actually I cheated. I went to racesystems.com and used Byron's calculator. At first I got confused because if you retard or advance a cam on the ICL the ECL should change to. You need to manually change the ECL as well for proper timing. Side note, ICL + ECL/2 = LSA. That should help figure out the ECL. -------------------- 1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers 12.23 at 112.99 Best MPH 113.97 Posts: 776 | From: woodland | Registered: Dec 2000  |  : 93PONY Mr. Valve Events Member # 60 posted                           Aaron is right for the intake lobe set on a 110 center line. Byrons calculator is in-accurate for the exhaust. Opens @ 1 BTDC Closes @ 41 ABDC The exhaust opens @ 45 BBDC Closes @ 5 ATDC Looks to me like the best way to install this cam is on a 109ICL. Valve events like this: Intake opens @ 2 BTDC Closes @ 40 ABDC Exhaust opens @ 46 BBDC Closes @ 4 ATDC The reason I don't like this cam is the intake lobe & overlap. The intake lobe closes at the same point as the stock & 'E' cams. So, power will peak at roughly the same spot as those cams. You can get it to peak higher by retarding the cam (4 degrees for 500rpm), but then you may run into P2V issues & now the overlap is in the wrong place, so the midrange will suffer...... Just not that great of a design. The N41 I've degreed had 8 degrees of advance built in.....So, check/double check your readings. Also, the best method to use is checking the valve events @ .050. Make sure you 'zero' the dial indicator on the lifter while on the base circle of the lobe. For figuring valve evets: Overlap = ((intake duration + exhaust duration)/2) - LSA (overlap for any given lift. .050, .006, etc) Intake valve events: (intake duration @.050 /2)-ICL = degrees BTDC (- = ATDC) Add the duration @ .050 to this # to find the closing point. Exhaust valve events: exhaust centerline = (2 * LSA) - intake centerline. (exhaust duration @.050 /2) - ECL = degrees ATDC (- = BTDC) Add the duration @.050 to this # to find the opening point. Take your time. You'll learn a LOT! [ December 30, 2002, 09:19 AM: Message edited by: 93PONY ] -------------------- www.advancedenginedevelopment.com SCT dealer Dynotuning (916)715-7569 Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000  |  : JoeT ¯ Member # 298 posted                                 thanks man, I'm not out to break any records, but I do expect this cam to 'run hard'. We'll see right? Can always swap it out later if it's a dud. P/V wasn't even close last time I did this. If I'm not mistaken, giving up mid-range is a really bad idea on an EFI car limited to 6k rpms. Thanks for all the advice! if this cam and TFS heads can buy me 0.53 in ET, I'll have met every goal I've ever set for myself I am more or less already committed to trying a custom cam for this combo probably in early summer if not sooner. I have a hunch that it won't be worth more than 1 mph on my combo but we'll see. -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : 93PONY Mr. Valve Events Member # 60 posted                           It should really pull above 3K....& it'll drop sharply around 6K. This cam has a narrow powerband...but, you should reach your goals easily. -------------------- www.advancedenginedevelopment.com SCT dealer Dynotuning (916)715-7569 Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000  |  : JoeT ¯ Member # 298 posted                                 results of degree'ing (I went over this like 5 times). installed on a 100 ICL. ouch. my comp-cam timing set has 4 degree intervals so I s'pose I can swing it out to 108 ICL. -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  :

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