[Fot] Cams

[timmmurphh at gmail.com]

Thanks for your input on that, Glen.   Very helpful and useful advice.

 

Tim

 

From: fubog1 <fubog1 at aol.com> 
Sent: Tuesday, July 17, 2018 12:05 PM
To: timmmurphh at gmail.com; rbtr3a at cox.net
Cc: fot at Autox.Team.Net
Subject: Re: [Fot] Cams

 

Yes, lacking access to a Cam Doc, you can use a set of V or bearing blocks, a degree wheel, dial indicator, and a bit of time, checked at 5 cam degrees, works fine.

I'm still old school though, I plot them out on graph paper!

That will give you the lobe profile but most folks don't have the full specs on the cam, usually just advertised lift and duration.

Since the tip of the lobe usually starts to go away first, a simple lift measurement will reveal the worst, best done with a dial indicator cuz some (cheap) cams are ground on different base circles.

Generally, ramp wear is unusual if the tip is still OK, although there can be exceptions.

 

Glen.

 

 

 

 

-----Original Message-----
From: timmmurphh <timmmurphh at gmail.com <mailto:timmmurphh at gmail.com> >
To: 'fubog1' <fubog1 at aol.com <mailto:fubog1 at aol.com> >; rbtr3a <rbtr3a at cox.net <mailto:rbtr3a at cox.net> >
Sent: Tue, Jul 17, 2018 12:38 pm
Subject: RE: [Fot] Cams

By degreeing the cam using increments of 10 crankshaft degrees (5 camshaft degrees) and then plotting the results in Excel, it is possible to get a very accurate picture of the profile of the cam.

 

I’ve attached a spreadsheet showing an intake and exhaust lobe comparison two years apart of our Kastner G3 cam for reference.

 

Tim Murphy

#317 TR4

 

From: Fot <fot-bounces at autox.team.net <mailto:fot-bounces at autox.team.net> > On Behalf Of fubog1 via Fot
Sent: Monday, July 16, 2018 6:31 AM
To: rbtr3a at cox.net <mailto:rbtr3a at cox.net> ; fot at autox.team.net <mailto:fot at autox.team.net> 
Subject: Re: [Fot] Cams

 

Generally any obvious wear or pitting would make it unserviceable, but the wear isn't always so obvious.

You can measure the lift and compare to spec, that will show any worn lobes, but the best way is to find someone who has a "cam doctor". It's a machine that sets it up and measures the complete profile.

Usually if there is anything apparent that suggests that there may be problems, there are...

 

Glen

 

 

-----Original Message-----
From: rbtr3a--- via Fot <fot at autox.team.net <mailto:fot at autox.team.net> >
To: fot <fot at autox.team.net <mailto:fot at autox.team.net> >
Sent: Sun, Jul 15, 2018 6:47 pm
Subject: [Fot] Cams

How do I determine if a cam is good or bad. If there are any marks on it does that make it bad. I do know that two of the lifters has pitting on the surface. 

Ronnie
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