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GoFastRacer
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Posted: May 10 2005,10:52 am |
Post # 2 |
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If the lobe is not damaged put a new lifter in, you can use new lifters on a used cam. You will have to do the break in again though to mate the new lifter to the cam!.. 
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jordy
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Posted: May 10 2005,4:04 pm |
Post # 4 |
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I do believe that if you do the break in correctly, the lifters will dish out long before you wear a cam out, hence the smoke ring patterns that start to appear on the face of the lifters so you can track the wear. Â 
Not to mention, if you figure the wear area of a lifter versus a cam lobe, the cam lobe has a lot more area that is run on versus the face of the lifter. 
Edited by jordy on May 10 2005,4:04 pm
Everyone is a tough guy, until you meet one. Â
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GoFastRacer
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Posted: May 10 2005,8:06 pm |
Post # 6 |
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| Quote (jordy @ May 10 2005,5:04 pm) | I do believe that if you do the break in correctly, the lifters will dish out long before you wear a cam out, hence the smoke ring patterns that start to appear on the face of the lifters so you can track the wear. Â
Not to mention, if you figure the wear area of a lifter versus a cam lobe, the cam lobe has a lot more area that is run on versus the face of the lifter. Â Â |
Under normal wear and maintenace they both wear pretty equal, it's when the lifter stops rotating or slows down that's when things turn to shit and usually the both cam and lifter goes away, thers'e only a few thousand's on the cam lobe that's hard, the rest is just cast iron!.. 
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GoFastRacer
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Posted: May 10 2005,8:12 pm |
Post # 7 |
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| Quote (AZKC @ May 10 2005,6:33 pm) | | Thats what I was figuring. This is kind of odd wear its like the lifter quit spinning or never spun  its only on about 110* of the face. |
Even though the lifter is only on part of the lobe, the lifter uses the whole surface because it rotates, when it stops rotating that's when everything goes fubar!... If the lifter quit rotating under break in it could be from not enough lube prior to start up or excessive cranking before start up, or possible inferior part!..
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GoFastRacer
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Posted: May 11 2005,7:48 pm |
Post # 10 |
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| Quote (AZKC @ May 11 2005,9:06 am) | We did crank it a bit long to get fuel to the carb  Probably should have primed the carb with fuel first instead of using the fuel pump to do it  |
That could have been the problem, depending on the cam and spring pressure they can go away quick, I've seen a cam go away in 30 seconds from cranking!.. With carbs I always fill all the float bowls and then with the accellarator pumps I give a good load of fuel especially if it's a dry motor(first fire), make sure the timing is dead on, it should start on less than one revolution, if not find out why!..
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AzMandella
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Posted: May 11 2005,8:16 pm |
Post # 11 |
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| Quote (GoFastRacer @ May 11 2005,8:48 pm) | | Quote (AZKC @ May 11 2005,9:06 am) | | We did crank it a bit long to get fuel to the carb Probably should have primed the carb with fuel first instead of using the fuel pump to do it |
That could have been the problem, depending on the cam and spring pressure they can go away quick, I've seen a cam go away in 30 seconds from cranking!.. With carbs I always fill all the float bowls and then with the accellarator pumps I give a good load of fuel especially if it's a dry motor(first fire), make sure the timing is dead on, it should start on less than one revolution, if not find out why!.. |
Although you are very correct Art,I tend to think the fact that the valves were hitting the pistons it was probably putting the lifter in a pretty good bind posssibly swedging the lifter bore.Especialy since this isn't the first time he has done that.
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GoFastRacer
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Posted: May 11 2005,8:33 pm |
Post # 12 |
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| Quote (AzMandella @ May 11 2005,9:16 pm) | | Quote (GoFastRacer @ May 11 2005,8:48 pm) | | Quote (AZKC @ May 11 2005,9:06 am) | | We did crank it a bit long to get fuel to the carb Probably should have primed the carb with fuel first instead of using the fuel pump to do it |
That could have been the problem, depending on the cam and spring pressure they can go away quick, I've seen a cam go away in 30 seconds from cranking!.. With carbs I always fill all the float bowls and then with the accellarator pumps I give a good load of fuel especially if it's a dry motor(first fire), make sure the timing is dead on, it should start on less than one revolution, if not find out why!.. |
Although you are very correct Art,I tend to think the fact that the valves were hitting the pistons it was probably putting the lifter in a pretty good bind posssibly swedging the lifter bore.Especialy since this isn't the first time he has done that. |
I was thinking besides that factor!.. 
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GoFastRacer
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Posted: May 15 2005,4:28 pm |
Post # 17 |
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| Quote (AZKC @ May 15 2005,10:41 am) | Well I pulled the cam and checked the lobes with a mic and they all are the same size and in good shape which is a good thing  but after a little better inspection of the lifters I have 5 that need changing out  The others have the little circle dealio going on and seem to have survived, now if I can just remember which lifter goes on what lobe........just kidding    |
One question, is there any pits on any of the lobes??????, if not you're good to go, if there is any pits at all the cam is junk, double check them be a pisser to put new lifters in and just have it go away!... The easy way to check a lifter is to use a straight edge across the bottom, it should rounded, if it's flat it won't rotate and it's junk, also goes for any pits on the surface!... Good luck!..
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GoFastRacer
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Posted: May 16 2005,6:06 am |
Post # 19 |
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| Quote (AZKC @ May 15 2005,6:31 pm) | | Cam is smooth, the 5 lifters I'm replacing look like they had sand paper run across the bottom, they were also the ones hardest to remove |
Cool, if the lobes are all nice and smoothe with no marks you're in good shape, the lifters should be the same, sand paper marks on the lifter means it's shot they should be smoothe like the cam!.. If they were hard to get out, check the lifter bores, you may need to hone them a bit, lifter should slide in and out effortlessly!..
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