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Re: Degreeing a cam in..
[Re: Dodgem]
#437261
08/14/09 11:35 PM
08/14/09 11:35 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Quote:
This is my small 11" wheel only one that will fit in the car. Have a bigger 14 or 16" real cool!
I don't own the smaller degree wheels,can you tell us the difference between them?
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Re: Degreeing a cam in..
[Re: goldmember]
#437264
08/14/09 11:42 PM
08/14/09 11:42 PM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Quote:
This is my small 11" wheel only one that will fit in the car. Have a bigger 14 or 16" real cool!
I don't own the smaller degree wheels,can you tell us the difference between them?
I originally in the days before time had a direct connection 7"
http://chucker54.stores.yahoo.net/mopdegwheel2.html
then later as the earth began to cool I got the 11 " fits just right down in the car
and now I have an 18"
http://chucker54.stores.yahoo.net/mor18degprow.html
The bigger they are the larger the numbers this does two things makes it easier to read and more accurate. I assume that's what your asking!!
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Re: Degreeing a cam in..
[Re: VernMotor]
#437266
08/14/09 11:58 PM
08/14/09 11:58 PM
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Joined: Aug 2003
Posts: 43,180
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,180
Bend,OR USA
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I had one Moroso degree wheel and one Mr Gasket, I gave one of them to 9secondPhil years ago, my point is that , as already pointed out, that some of the degree wheels will mislead you. I bought one form Comp Cams last year as the center of the old ones was getting worn and wouldn't always center good  , The new one doesn't have a centering adapter so I have to hold it on center and tighten the bolt up and hope it stays in the center  LOL  The intake cylce begins with the intake valve opening before top dead center and ends up closing after bottom dead center with max lift somewhere bewteen 90 degrees after top dead center and 120 after top dead center, some people will call that 90 degrees before bottom dead center and 60 degrees BBDC The thing to remember on checking the cam timing on both lobes at .050 lifter rise is to add the 180 degrees between TDC and BDC that happens every time the valves open and close, if the intake valve opens at 35 .050 lifter rise before top dead center and closes at 56 degrees after bottom dead center you have 35+180+56 which equals 271 degrees intake valve duration at .050  Same thing on the other side but the exhaust valve timing starts before BBDC and closes ATDC, so its maximum valve opening is always going to occur before top dead center. On finding and checking lobe center you measure in relation to max lift .050 before and after, I measure in three places to make sure what the valve is seeing as it reaches maximum lift  don't be suprised to occasionally see one degree variation on those three places My point on bringing this up is you can check it at .300 begore max lift or .050 BML, the lobe center will stay where the cam grinder made it  As far as degree wheels, here is a picture of the two I have now, they are confusing if you don't use them as a way to measure cranksaft degrees only
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Degreeing a cam in..
[Re: goldmember]
#437267
08/15/09 12:01 AM
08/15/09 12:01 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I was looking for accuracy and whether there was over 1 degree difference between them.I thought with all the pics,I might learn something important.
Well in a 11" wheel you have .095 per degree and in a
18" wheel you have .157 per degree... you can get much
closer with the big wheel
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Re: Degreeing a cam in..
[Re: goldmember]
#437270
08/15/09 07:48 AM
08/15/09 07:48 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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mine's marked 0-180, not 0-90-0....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Degreeing a cam in..
[Re: goldmember]
#437272
08/15/09 08:51 AM
08/15/09 08:51 AM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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Quote:
It's obvious the larger wheel SHOULD be more accurate. I was looking for some testing to confirm enough to replace my old unit. Guess I'll keep it.
The larger wheel is easier to read, but even a 7" when used carefully and correctly will get the job done "accurately". If you can repeat the setup and ICL less than 1 degree, that is all you need. The operator is more important...But better tools make it easier. IMO, setting the wheel to TDC is the place to spend time getting it the best you can.
When I buy a cam, I map the duration from 0.020" to 0.350" lobe lift, that is close to 0.050" before max lift depending on cam. Once you get to 0.050", the ICL should be the same (less than 1 degree different measurement). If you do it at 0.006, 0.008, 0.020, 0.050" you will see the difference in the opening and closing ramps.
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