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#1
09-07-2007, 02:23 AM
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cam breakin ?
I have read many threads on this and Hands book. I have one small question is the above 2000rpm for 20minutes a steady or varing above 2000rpm? I.E. cycling from 2to 2.5to3rpm. or steady as close as possible to 2000rpm? thanks Rod.
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#2
09-07-2007, 06:48 AM
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It should be changed from 2000 to 2800 to vari the oil spray pattern so that the full lenght of the cam gets good oil coverage.
You should be using a non- detergent oil for brake in. I even go so far as heating up the last few quarts of oil in the microwave before I add it to the crankcase.
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SJM |
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#3
09-07-2007, 09:52 AM
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20 minutes minimum and if you can keep temps in control 30 minutes would be better. keep the rpm above 2000. I vary the speed myself keeping between 2-3000 rpm (avg 2500). With inner springs removed you could(depending on cam and spring combo) be near valve float at 3000 rpm so be careful.
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#4
09-07-2007, 10:43 AM
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So what do you do if you don't have a tach?
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1973 base firebird Original 350, with 69' #46 heads, crower 60240, 9.3:1 cr |
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#5
09-07-2007, 11:21 AM
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Buy a tach. You should have an oil pressure gauge too.
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68 Firebird Are you running with the wind or breaking it? |
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#6
09-07-2007, 12:12 PM
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I mounted (with Ty Wraps)a temp and oil pressure gage to the cowl wehn I broke in my motor. It was nice being able to see what's going on without having to look inside at the dash.
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70 Bonneville 455, survivor (Third Owner) |
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#7
09-07-2007, 07:09 PM
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drive it?
What about just driving it during that time?
I'm pretty close to the freeway... thinking why waste gas and ignore my neighbors, in 20 minutes, I can be on the beach!
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1969 Judge, 4-speed, CR/Parchment, Quasi-Survivor, #'s match - under restoration |
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#8
09-08-2007, 02:47 AM
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That was meant to be funny right? Just drive it? If by some chance you were seriously asking that question. The answer is no,never,nunca,nada,! That woud be not very nice!
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JJG |
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#9
09-08-2007, 03:12 AM
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The reason you don't want to drive it is the goal is to break the engine in under a no-load condition. Since the cam problems have become so plentiful, I have went to a 20 minute cycle, 20 minute cool down with engine off, and then one additional 20 minute run exactly the same as the first. We've done the last three cam break-ins that way and they're still spinning along. My reasoning is it gives the cam a full extra cycle to polish contact areas before exposing it to the real world.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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