Re: cam break-in
[Re: stage3]
#158754
11/29/08 11:23 PM
11/29/08 11:23 PM
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Joined: Oct 2007
Posts: 3,908
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,908
Oregon
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I believe the reason 2000rpms is recommended is to ensure that you have very good oil pressure during break in. Right now, more than ever, is when you need good pressure. I just followed that procedure, with Delo 400, and a bottle of comp cams additive, and so far so good 
If you ever find yourself in a fair fight, your tactics suck.
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Re: cam break-in
[Re: hooziewhatsit]
#158755
11/29/08 11:33 PM
11/29/08 11:33 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
I believe the reason 2000rpms is recommended is to ensure that you have very good oil pressure during break in. Right now, more than ever, is when you need good pressure.
I just followed that procedure, with Delo 400, and a bottle of comp cams additive, and so far so good
Actually it's not oil pressure it's oil splash/spray, the cam/lifter contact point isn't typically pressure lubed it's a high pressure sliding contact that recieves no pressurised lube so oil spray is critical....Think about it your valve springs a set at 2-300 Lbs open pressure now that pressure is on the contact between the cam & lifter but only a very small portion of the lifter is actually in contact with the cam due to the curvature of the lifter face...Do you really want to short cut the camshaft break-in? Are you aware of the missing ZDDP in oil these days?...BTW Flat cams were such a common problem with Hemis back in the sixties that Chrysler designed low taper camshafts & reduced radius lifters to increase the contact pattern.... BTW This was due to the Hemi valve spring pressure the 440 Sixpacks used the same springs...
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Re: cam break-in
[Re: stage3]
#158756
11/30/08 12:22 AM
11/30/08 12:22 AM
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Joined: Dec 2007
Posts: 18,160
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,160
Mass
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Quote:
Is the method of running the engine for 30 minutes
at 2000rpm really necessary for cam break-in?
I've followed this procedure for the last 25 plus years rebuilding engines,.....never lost a cam, or motor
you can cut the time down to 15 minutes,....2000RPM is recommended, because the cam is turing at 1/2 RPM, vs the crankshaft,....2000RPM crankshaft speed = 1000 RPM camshaft speed,.....lower break-in RPM's won't allow proper/ suffcient oiling in the camshaft/rocker assy......plus there's a metallurgical hardening process the cam and lifter mating surfaces go thru during this "run"
improper "run-in" can/might result in "wiped" lobes or lifters 
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