The wear problems occur when either the cam lobes or the lifter bores are slightly out of square ... and they usually are. After about 30K-50K miles new cam/lifters usually develop compatible wear patterns that they can live with before they wear all the way through their hardened surfaces. But the hardened surface generally isn't thick enough to do this more than once. OTH if you're swapping cams every few thousand miles you'll never see a wear pattern develop but you'll still be wearing through the hardened surfaces little by little. ----- Original Message ----- From: Larry Alster To: 'Bill Cardell' ; 'Robert McElwee' Cc: 'Miatapower' Sent: Monday, September 01, 2008 10:35 AM Subject: RE: Swapping camshafts today. Any advice?
Can you say crap shoot boys and girls. Of course it was on push rod engines but I've seen the new cam be put in the engine and the lifters reused and the engine made those nice lobe shaped bumps on the cam a pretty circle shape. Larry White Knight 1991 Crystal White #99 CSP Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo Honey B 1992 Sunburst Yellow #99 SM2L JR Supercharger Whooosh 2004 Titanium Mazdaspeed MX-5 LowCountry Miata http://www.lowcountrymiataclub.net Masters Miata RAGS 074 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Cardell Sent: Monday, September 01, 2008 1:19 PM To: Robert McElwee; Larry Alster Cc: Miatapower Subject: RE: Swapping camshafts today. Any advice? Not to say Ray and Larry aren't correct, because it is good practice to always replace lifters and cams together. In some of my own cars I've had maybe five different cams on the same lifters without any undue wear. YLWMV. Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com orders 1-800-FLY-MX5S Before you call our tech line (970.464.5600) please check out the FAQ section of our website ------------------------------------------------------------------------------ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert McElwee Sent: Monday, September 01, 2008 10:49 AM To: Larry Alster Cc: Miatapower Subject: Re: Swapping camshafts today. Any advice? Nope, I had no idea that was even a concern. The plan is to put this cam in, run it for 200 miles (long enough to prove that it does nothing for me <G>) and then pull it back out. It sounds like what you and Ray are saying is that I will wear out my lifters if I decide to run like this full time. I'll definitely have to research new lifters. A quick check on rockauto shows they are $22 each. I've never replaced lifters before. Hard to do? On Mon, Sep 1, 2008 at 8:24 AM, Larry Alster <[EMAIL PROTECTED]> wrote: You do realize that lifters are considered matched to a not only the cam but the specific lobe by the wear pattern they develop. So you're going to replace the cam and reuse the lifters that have run with that cam on those lobes?? Hope you're at least going to use a bunch of cam lube on the lobes to help the engine at startup. Larry -- Robert McElwee and Blue Flash "The 50 MPG Miata" www.lightweightmiata.com/mpg Lightweight Miata Forum: www.lightweightmiata.com/forum The Miata Trailer Project: www.lightweightmiata.com/trailer ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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