new engine break in.avi
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The key thing is not to let the engine idle. Letting the engine idle can wear the peak of the cam lobes away before they have had chance to bed in. The bases of the lobes will not be affected though so the wear pattern is very distinctive. Copyright David Baker and Puma Race Engines.
Read More at pumaracing.co.uk slash cam1.htm
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Contact loads on the peak of the cam lobe are high at low rpm and low at high rpm.
Contact loads on the base of the cam lobe are low at low rpm and high at high rpm .
When we run a new cam in, it is matter of finding an engine speed that is a compromise between high loadings on the cam nose and high loadings at the start of the lobe. A speed somewhere in the middle of the rpm range is what we need to achieve this. Some manufacturers specify 2,500 rpm, some 2,000 rpm etc etc.
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I don't know if you read the original post but it clearly states that the cam has already had the break in run made. This was done according to the cam mfgr's specs of 20 minutes at 2200 rpm. The idling you see in the video is less than 2 minutes. I wait for traffic lights longer than that. Thanks for your comments.
dzcues 11 months ago