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AMX 401 Take 5
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Boris Badanov View Drop Down
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Points: 4209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 3:00pm
It's 90% CNC now. the days of masters and hydraulic cam grinders
are now entirely in the second tier market.
Not to say thay make a bad cam at "Joes Cams".
Not at all.
But I have talked to the guys at Howards frequently, it's all CNC there.
 
That said it is easy to make the "master" grind a slightly larger or smaller
with the old machines as well.
 
I would drop a dime with the cam grinder before making a change.
 
 
Gremlin Dreams
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SKeown View Drop Down
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Points: 3085 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 3:17pm
 
 Yes, Howard's bought that Landis computerized grinder from another company a few years ago. No, the majority of today's grinders don't use computerized grinders, many still use Bercos grinders. It's expensive to get a company to create a dog for various brands of engines for their computerized grinders, at least it was for Lunati. 

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348AMX View Drop Down
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Points: 4165 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 348AMX Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 3:27pm
why all this guessing about the lifters?? Just measure the diameters of the bores and lifters and see if there was excessive clearance causing pressure loss. Very doubtful that the internal valve design of the lifters is causing this oil pressure mystery, unless they are defective.
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Boris Badanov View Drop Down
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Points: 4209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 3:34pm
348 AMX, watch the video.
 
And over oiling the vlave cover area is a common issue.
 
I had the problem 35 years ago with Crane Hyd lifters.
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SKeown View Drop Down
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Points: 3085 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 3:48pm

 Apparently they are having second thoughts about replacing the lifters, I would send them back requesting they make the necessary changes in metering the oil flow to the rockers. Something is going on being that reducing the pan's volume by 1 1/2 quart put it back to sucking air. When I returned a lifter for not oiling at all, Joe admitted they had supplied a bad lifter, faulty machining.

 SKeown 


Edited by SKeown - Aug/23/2014 at 3:52pm
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Boris Badanov View Drop Down
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Points: 4209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 8:18pm
If nothing else the video is showing that you are getting WAY more oil than is needed to the top end.
Gremlin Dreams
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SKeown View Drop Down
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Points: 3085 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2014 at 11:27pm

 For those wondering what effect roller wheel diameter has on the cam's duration, here's an example.

Here's the duration changes for one of my .475"lift, SBC profiles, when changing from a .750" wheel to a .810" Wheel.

Duration -- Wheel Size
@Lift ----- .750"/.810"
.020": 315.04/315.49
.050": 278.52/279.68
.100": 245.30/246.80
.150": 219.89/221.46
.200": 197.15/198.68
.250": 175.25/176.67
.300": 152.65/153.85
.350": 127.74/128.72
.400": 98.19/98.93
.450": 55.43/55.83
Mike Jones
Jones Cam Designs
Denver, NC
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ScrambledEgg View Drop Down
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Points: 348 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ScrambledEgg Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2014 at 5:54pm

For those wondering about the high energy and the pro magnum hyd lifters that Comp Cams sells, here is what their tech line indicated:

 
Hi,
The actual measurement for the lifters would be, .9042, and the seat heights are 1.9015.  There is about a 0.0004 max deviation between the few I measured. Let me know if you have any questions.

Thanks,



On Mon, Aug 25, 2014 at 9:46 AM, COMP Cams Cam Help <camhelp@compcams.com> wrote:
Hi,
Looking for specific details on the two Comp Cams hyd lifters (high energy
and pro magnum) you sell for AMC/Mopars. My question is concerning the
diameter that is specified on your website. Both indicate .904 dia. Is
this nomimal or a rounding up method? meaning that are some less than .904
and some are at .904? Looking to see the true exact diameter and getting
it out one more decimal would be great such as .9035 etc. thank you in
advance for your help.
ScrambledEgg
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Slate View Drop Down
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Points: 2784 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Slate Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2014 at 7:06pm
I got the same reply and asked further to make sure there was no confusion:

"Ok, I'm assuming that .9042" is nominal and the max deviation represents a plus/minus .0002" on either side of .9042" for a maximum deviation total of .0004? Thank you for replying."

Trey Fields

2:27 PM (2 hours ago)
to me
Hi,
That would be correct.
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Boris Badanov View Drop Down
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Points: 4209 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Aug/26/2014 at 7:39pm
I never disagreed that the change could be minimal.
2 degrees is not a big deal.
Just that I would drop a dime first. A bind on the ramp
or excessive accel-decell could do damage.
Gremlin Dreams
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