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Old 12-31-2003, 08:31 PM
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cam breakin ?

I just read a post that said not to use synthetic motor oil to break in a flat tappet cam, what is the difference between synthetic oil and oil that's not synthetic ?

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Old 12-31-2003, 10:16 PM
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I`m not sure of the actual properties in the oil that makes the difference. but since synthetic oil`s lubrication is far better than conventional oil, it`s not recommended for use in a fresh engine break in, or camshaft break in, out of the fear since they provide such outstanding lubrication, the cam won`t establish a wear pattern and the rings won`t seat up. a friend of mine had his small block built and installed it with regular oil, broke in the cam, and changed over right away to synthetic, the car still smoked and used oil 10,000 miles later, he swapped back over to conventional oil and ran it for 3000 miles, the smoking and oil consumption stopped, since the rings had finally seated, he them went back to synthetic. there`s arguments that synthetic shouldn`t be used in high mileage engines, as well as new engines, these arguments won`t stop anytime soon either.
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Old 01-01-2004, 12:29 AM
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Your flat tappet lobes actually have a high side that spins the liter,Im told synthetic can be too slick to let this procedure start occurring,the first 20 minutes or so are the critical time that tells if your cam lives or dies, I break all mine in with a bottle of GM EOS oil additive with delo 400 and have had great success,after about 5000 miles I go Mobil 1.
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Old 01-01-2004, 09:26 AM
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So i guees what im reading is i should never use synthitic oil ever if i wanna keep the ring's sealed. One of the ? that seem's to pop in my head is that some degree of material whare does accur let say maybee .001 or to what ever from one lobe to the other, that would mean that if my cam started out with a .458 lift, it would them maybee have .458 on some lobe's and maybee .456 on other lobe's and posibly .454 on other's. To me that would seam like an inconsistant piece of a cam, also how many year's or mile's on the motor would this start to accur, and how long would it be before i kicked myself i my duppa saying to myself i shoulda gotta a (ROLLER CAM) instead. (LOL)
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Old 01-01-2004, 09:51 AM
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Yeah,you kinda got the picture,make it wear,then stop the wear with synthetic.If your cam wore a measurable amount it would go flat fast anyway.
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Old 01-01-2004, 10:12 AM
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So after the breahin prosess is finfshed i would then drain the oil out and replace it with the synthetic oil?
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Old 01-01-2004, 11:01 AM
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You got it man,run a good hot thermostat if you want to speed up the rings breaking in.
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Old 01-01-2004, 11:56 AM
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Cool! yea most of the time when i buy oil i just buy the cheapest oil i can because most of my engine's have a lot of mile's on them and use about a quart or two a weak, so dont realy pay any attention to weather or not it's synthetic oil. So if you would, tell me what name brand of oil you use for your breakin's
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Old 01-01-2004, 12:29 PM
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Yea,Ive had a few of those cars,I call it self recirculation, but anyway I personally like chevron 30 wt delo and I pick up a bottle of GM EOS oil supplement from the dealer to mix with it. Pour it in first so it mixes up,its cheap insurance to me. Nothin sucks more that having to open a motor up twice,I swear by it.
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Old 01-01-2004, 01:07 PM
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Thanx for the info there (rifraf) i wrote it do on paper so i dont forget what it is. But it's time to leave for Kasnsas City,MO to deliver a load for friday and i'll chat over the weekend.
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