I've been buying and running these guys cams in my own and customers motors for ten years now. The price is perfect and i've never had one single failure. Delta turned the reground game around!
Thank you for taking the time to make this video and sharing your expertise! I stumbled across a cam grinding business that is for sale called berry cam in Minnesota, and knowing nothing about cam grinding, your video gives a good sneak peak as to some of the ins and outs of lobe work. I find it quite fascinating. No doubt the work you do is satisfying and rewarding.
I imagine shops have existing tooling for numerous original equipment camshafts probably going back the 1950s. There also is numerical control equipment available. I just looked it up. A factory-grade CNC camshaft grinder costs $900,000. You'd better be serious about the business if you get one of those. But for you $899,999.99.
Let me say i know nothing about cam grinding so this is an honest comment born of ignorance. I am with you where you use an un worn section of a lobe to create a "patern" but totally lost how you can then grind something down that is already worn down and end up with a part that is on spec. Very cool machine and thanks for sharing the video.
@arachnipope. Excellent answer to a check somewhat complex subject. The today, most people are spoiled with modern engine design using hydraulic lifters, roller or flat tappet design. I stared over 4 decades ago with small engines to full sized vehicle engines at age 12. Valves where mostly all adjustable which allows for the rocker arm to follow the lobes profile. Showing the process of regrinding a camshaft that is a change or like this one, no longer available. They where very lucky having a spot that is not worn, is pure luck. I have a plastic bag with 6 different type of SnapOn feeler blades including two sets of “go, no go” blades. Also angled & brass. I never went to a tech school, working as an apprentice I guess, paid sponge to soak up what the guy in the one man shop could teach me. Depending on your age, the “Motors” manual was the Bible & the front cover has the time/labor chart. So a water pump pays 2.3 hrs. you went across the top column to find your shops labor rate of $6.00, then down the side to find the time of 2.3 hrs. and where the two met on the “Truth” table, was what you charged the customers plus parts & fluids. We rebuilt older tractors that I found out quickly, they had no marks on the timing gears. You had to put #1 on TDC of the power stroke, then stamp you own marks. Years of motorcycle work (Mine) I was surprised to find a “Wet Clutch” behind the normal dry clutch you would find in anything, like a school bus. Replaced “King Pins”, reamed them to fit, differentials in cars, trucks and tractors. The ring gear was over 300 pounds. Cut front axle bearings off combines in the field, with an ox-act. torch and changed combine “V” belts that where 28 feet long folded at age 14. So have done a lot and now at 62, seems like a blur. Blessings to you as I walk down memory lane. ASE Master Tech since 78.
@@DELTACAM8005625500 spell check got me wrong again. Erson cam .Not Person. Thanks for answer. I'm going to call you guys and ask. And I know if you have the cam you can take it in the back and measure the specs. You guys are great. Always done me right. The last time I was up in Tacoma I was going to drop by and give you some cams I've collected over the years, but the traffic is so bad and that damn weather.
not at all some places will cut the base circle to get more lift then reshape the lead and following lobes to get back to the same specs it was when new, or a revised performace "Custom Grind" with more or less duration dependent on drag class or induction applications
This is an old video but I've been dying to ask a pro.. If I can get this to make sense... On an OHC engine with cam rocker arms. When reducing the base circle does it not change the overall geometry, extend the arc contact point outward, and therefore reduce net lift? (Because now the rocker must rotate more to reach the cam)
It has to make some difference somehow. I'm not the best at visualization but it seems to me you would get later and more rapid lift but not quite as much lift. But then you start at a point closer the centerline also. Then there's the question of whether you have solid or hydraulic lifters. I doubt if you are rebuilding to stock or near stock that it makes any noticeable difference. But it is an interesting question. I would like to see the expert answer also. I might be totally wrong in my conceptions.
No, everything (Meaning cam specs.) is the same except for the base circle (Round Bottom) of the camshaft is smaller. If too much is ground off the base circle, then problems like needing longer push rods and / or the oiling grove around the lifter is too far down in the lifter bores due the lifter is farther down it's bore to meet the camshaft base circle.
Here's what I don't understand if I send a cam in to be regrind... how can you regrind it and not know what the new base circle is? If I know what I have before the regrind and I know what I have after the regrind I can make an educated guess on what I need to order to make the rest of my valve train work.
Majority of the cams use adjustable rocker arms, so you would simply re set valve lash, a small block chevy is hydraulic, so set the rockers to zero lash then 3/4 turn to pre load lifter. There are applications where we measure prior to grinding, then provide post grinding info so the head can be set up accordingly
If he has never ground a cam exactly like it. .......... What he did in the video was take a rare cam and used the best lobes that it had to make a "Master" profile in order to repair the other worst lobes. .......... No, you cannot bring in a totally all lobe worn out rare cam that he has never cut before and get a perfect reground cam from it. .......... Once they make a master of a cam they have never ground, they generally mark the Masters and catalog them for future use if needed. .......... This is dependable old school cam grinding technology. ..........
I've been buying and running these guys cams in my own and customers motors for ten years now. The price is perfect and i've never had one single failure. Delta turned the reground game around!
Thanks for the good review.... been going at it for 34 years
He is the most experienced and expert guy in his field. I am sure he is the cam doctor/surgeon of the automotive world.
Thank you for taking the time to make this video and sharing your expertise! I stumbled across a cam grinding business that is for sale called berry cam in Minnesota, and knowing nothing about cam grinding, your video gives a good sneak peak as to some of the ins and outs of lobe work. I find it quite fascinating. No doubt the work you do is satisfying and rewarding.
Cool video. You guys have always been great.
i love watching old iron being rejuvinated.
I imagine shops have existing tooling for numerous original equipment camshafts probably going back the 1950s. There also is numerical control equipment available. I just looked it up. A factory-grade CNC camshaft grinder costs $900,000. You'd better be serious about the business if you get one of those. But for you $899,999.99.
Really cool video !
Let me say i know nothing about cam grinding so this is an honest comment born of ignorance. I am with you where you use an un worn section of a lobe to create a "patern" but totally lost how you can then grind something down that is already worn down and end up with a part that is on spec.
Very cool machine and thanks for sharing the video.
The base circle of the cam will be smaller so you will have to adjust the valve-train to compensate
@arachnipope. Excellent answer to a check somewhat complex subject. The today, most people are spoiled with modern engine design using hydraulic lifters, roller or flat tappet design. I stared over 4 decades ago with small engines to full sized vehicle engines at age 12. Valves where mostly all adjustable which allows for the rocker arm to follow the lobes profile. Showing the process of regrinding a camshaft that is a change or like this one, no longer available. They where very lucky having a spot that is not worn, is pure luck. I have a plastic bag with 6 different type of SnapOn feeler blades including two sets of “go, no go” blades. Also angled & brass. I never went to a tech school, working as an apprentice I guess, paid sponge to soak up what the guy in the one man shop could teach me.
Depending on your age, the “Motors” manual was the Bible & the front cover has the time/labor chart. So a water pump pays 2.3 hrs. you went across the top column to find your shops labor rate of $6.00, then down the side to find the time of 2.3 hrs. and where the two met on the “Truth” table, was what you charged the customers plus parts & fluids.
We rebuilt older tractors that I found out quickly, they had no marks on the timing gears. You had to put #1 on TDC of the power stroke, then stamp you own marks. Years of motorcycle work (Mine) I was surprised to find a “Wet Clutch” behind the normal dry clutch you would find in anything, like a school bus. Replaced “King Pins”, reamed them to fit, differentials in cars, trucks and tractors. The ring gear was over 300 pounds. Cut front axle bearings off combines in the field, with an ox-act. torch and changed combine “V” belts that where 28 feet long folded at age 14. So have done a lot and now at 62, seems like a blur. Blessings to you as I walk down memory lane. ASE Master Tech since 78.
How much metal did you take off the camshaft ??? What does grinding the cam cost ??? Nice job fella too. VF
Hello my friend. Could you help me see what rod is good for adding material to the camshaft lobes before re-grinding?
I have an old Person cam that was in a Cleveland. Number on back of cam is 785. Anyone know the specs ?
Id need the cam here to get the specs off of it
@@DELTACAM8005625500 spell check got me wrong again. Erson cam .Not Person.
Thanks for answer. I'm going to call you guys and ask.
And I know if you have the cam you can take it in the back and measure the specs.
You guys are great. Always done me right.
The last time I was up in Tacoma I was going to drop by and give you some cams I've collected over the years, but the traffic is so bad and that damn weather.
Wow. I thought that cam would have required welding to save it.
not at all some places will cut the base circle to get more lift then reshape the lead and following lobes to get back to the same specs it was when new, or a revised performace
"Custom Grind" with more or less duration dependent on drag class or induction applications
This is an old video but I've been dying to ask a pro.. If I can get this to make sense... On an OHC engine with cam rocker arms. When reducing the base circle does it not change the overall geometry, extend the arc contact point outward, and therefore reduce net lift? (Because now the rocker must rotate more to reach the cam)
It has to make some difference somehow. I'm not the best at visualization but it seems to me you would get later and more rapid lift but not quite as much lift. But then you start at a point closer the centerline also. Then there's the question of whether you have solid or hydraulic lifters. I doubt if you are rebuilding to stock or near stock that it makes any noticeable difference. But it is an interesting question. I would like to see the expert answer also. I might be totally wrong in my conceptions.
How is center lobe cam to copy plat toolling??
Does this not reduce the duration of lift by taking that much off the cam??? and how is that compensated for in the rebuild or is it?
No, everything (Meaning cam specs.) is the same except for the base circle (Round Bottom) of the camshaft is smaller. If too much is ground off the base circle, then problems like needing longer push rods and / or the oiling grove around the lifter is too far down in the lifter bores due the lifter is farther down it's bore to meet the camshaft base circle.
Here's what I don't understand if I send a cam in to be regrind... how can you regrind it and not know what the new base circle is? If I know what I have before the regrind and I know what I have after the regrind I can make an educated guess on what I need to order to make the rest of my valve train work.
Majority of the cams use adjustable rocker arms, so you would simply re set valve lash, a small block chevy is hydraulic, so set the rockers to zero lash then 3/4 turn to pre load lifter. There are applications where we measure prior to grinding, then provide post grinding info so the head can be set up accordingly
Good 👍👍👍👍👍👍👍
Does that mean the tooling needs to be cut for each specific camshaft?
If he has never ground a cam exactly like it. ..........
What he did in the video was take a rare cam and used the best lobes that it had to make a "Master" profile in order to repair the other worst lobes. ..........
No, you cannot bring in a totally all lobe worn out rare cam that he has never cut before and get a perfect reground cam from it. ..........
Once they make a master of a cam they have never ground, they generally mark the Masters and catalog them for future use if needed. ..........
This is dependable old school cam grinding technology. ..........
Ok 👌👌👌
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