Re: Homemade lo-buck Cam Doctor
[Re: hemienvy]
#3032564
04/11/22 11:18 AM
04/11/22 11:18 AM
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Joined: Dec 2011
Posts: 201 Texas
Chief
enthusiast
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enthusiast
Joined: Dec 2011
Posts: 201
Texas
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I disagree.. The follower has different contact area which alters where on the lobe you are measuring.. Look at this degree tool kit, specifically the followers. You will see what I'm talking about. Degree Tool KitDave
Dave Covey
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Re: Homemade lo-buck Cam Doctor
[Re: Chief]
#3032566
04/11/22 11:23 AM
04/11/22 11:23 AM
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Joined: Dec 2011
Posts: 201 Texas
Chief
enthusiast
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enthusiast
Joined: Dec 2011
Posts: 201
Texas
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I'll also add your homemade setup will not measure ramp design without a lot of notebook space. Not sure how many calculations it would take to accomplish.
You could get rudimentary numbers, no problem. It would be nice if it were that simple.
My opinion though..
Dave
Dave Covey
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Re: Homemade lo-buck Cam Doctor
[Re: Chief]
#3032567
04/11/22 11:27 AM
04/11/22 11:27 AM
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Joined: Nov 2007
Posts: 21,816 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,816
Kirkland, Washington
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I disagree.. The follower has different contact area which alters where on the lobe you are measuring.. Look at this degree tool kit, specifically the followers. You will see what I'm talking about. Degree Tool KitDave An issue with flat tappets, yes. Not with rollers.
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Re: Homemade lo-buck Cam Doctor
[Re: Pacnorthcuda]
#3032588
04/11/22 12:28 PM
04/11/22 12:28 PM
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Joined: Dec 2021
Posts: 1,117 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,117
Loudoun County, VA
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I disagree.. The follower has different contact area which alters where on the lobe you are measuring.. Look at this degree tool kit, specifically the followers. You will see what I'm talking about. Degree Tool KitDave An issue with flat tappets, yes. Not with rollers. Crane Cams had a tech article on effect on duration w/ increase in roller wheel diameter from standard .750" to .810": Example from R280/500 .020 = 0.8 .050 = 1.3 .100 = 1.6 .200 = 1.7 .300 = 1.4 .400 = 0.9 Lifter wheel diameter absolutely has an impact on the motion translated at the pushrod.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: Homemade lo-buck Cam Doctor
[Re: hemienvy]
#3032632
04/11/22 02:57 PM
04/11/22 02:57 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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I'm not sure I could measure lobe separation. But maybe.
But measuring one lobe profile should be doable. Measure one lobe then the other. Compare. If you want the lobe info then measure the lobe directly. Use a small round tip on your dial indicator to minimize angularity error due to contact being slightly off to one side of the tip. Plot the results on graph paper.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Homemade lo-buck Cam Doctor
[Re: Pacnorthcuda]
#3032677
04/11/22 05:31 PM
04/11/22 05:31 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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I disagree.. The follower has different contact area which alters where on the lobe you are measuring.. Look at this degree tool kit, specifically the followers. You will see what I'm talking about. Degree Tool KitDave An issue with flat tappets, yes. Not with rollers. Roller wheel size has a large impact on transferred motion from the lobe. Most lobe catalogs address this.
"use it 'till it breaks, replace as needed"
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