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Topic: Which is harder?< Next Oldest | Next Newest >
AZKCMale Offline
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Post Icon Posted: May 10 2005,8:01 am Post # 1 see this member send this member a private message  quote this post in reply
Camshaft lobes or lifter faces? I have a lifter thats is jacked after the 10 minutes the motor ran. It's for the #7 intake  that ate the valve. Had a bitch of a time getting it out, all the other ones came out just fine and look ok. Took a peek at the cam it looks ok but need to get it out of the block for a better inspection. :banghead

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GoFastRacerMale Offline
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Post Icon Posted: May 10 2005,10:52 am Post # 2 see this member send this member a private message  quote this post in reply
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!..  :good
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AZKCMale Offline
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Post Icon Posted: May 10 2005,10:59 am Post # 3 see this member send this member a private message  quote this post in reply
I was in the middle of breaking in the cam when it broke. So I'll just start over on the cam break in with the new lifter/lifters if the lobe/lobes is/are ok. :laugh I was just wonder what wears first usually the lobe or the lifter :stupid

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Post Icon Posted: May 10 2005,4:04 pm Post # 4 see this member send this member a private message  quote this post in reply
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.   :D

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.   :stupid  :D

Edited by jordy on May 10 2005,4:04 pm

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AZKCMale Offline
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Post Icon Posted: May 10 2005,5:33 pm Post # 5 see this member send this member a private message  quote this post in reply
Thats what I was figuring. This is kind of odd wear its like the lifter quit spinning or never spun :stupid  its only on about 110* of the face.

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Post Icon Posted: May 10 2005,8:06 pm Post # 6 see this member send this member a private message  quote this post in reply
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.   :D

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.   :stupid  :D

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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Post Icon Posted: May 10 2005,8:12 pm Post # 7 see this member send this member a private message  quote this post in reply
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 :stupid  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!.. :stupid
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AZKCMale Offline
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Post Icon Posted: May 11 2005,8:06 am Post # 8 see this member send this member a private message  quote this post in reply
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 :rolleyes

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Post Icon Posted: May 11 2005,7:05 pm Post # 9 see this member send this member a private message  quote this post in reply
Ok Kevin one little tip.Never crank the motor over to get fuel to the carb on a new engine,especialy if you did not pre-oil it.You will wipe all the cam lube off of it and then when you do start it you may have abnormal wear durring breakin.That's what I love about roller cams,no breakin.Since that same cylinder has given you trouble before I would look at both of the lifter bores before reassembaly.Put a new lifter in each the int/exh bores and make sure they slide up and down smoothly and rotate easily.If one or both don't because it is tight get a brake hone and some cutting fluid and hone it with a drill slowly periodicly rechecking with the lifter.When done wash the whole block real well.

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GoFastRacerMale Offline
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Post Icon Posted: May 11 2005,7:48 pm Post # 10 see this member send this member a private message  quote this post in reply
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 :rolleyes

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!.. :stupid
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Post Icon Posted: May 11 2005,8:16 pm Post # 11 see this member send this member a private message  quote this post in reply
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 :rolleyes

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!.. :stupid

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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GoFastRacerMale Offline
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Post Icon Posted: May 11 2005,8:33 pm Post # 12 see this member send this member a private message  quote this post in reply
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 :rolleyes

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!.. :stupid

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!.. :D  :laugh  :laugh
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AZKCMale Offline
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Post Icon Posted: May 15 2005,9:41 am Post # 13 see this member send this member a private message  quote this post in reply
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 :rolleyes  but after a little better inspection of the lifters I have 5 that need changing out :break 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 :bebe  :rotflmao

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Post Icon Posted: May 15 2005,9:52 am Post # 14 see this member send this member a private message  quote this post in reply
Hell, if your going to change out 5 of them, why not change out all 8???  :stupid

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AZKCMale Offline
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Post Icon Posted: May 15 2005,10:28 am Post # 15 see this member send this member a private message  quote this post in reply
Cause I run a V-8 not a 4 cylinder :beat There are 16 :laugh

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Post Icon Posted: May 15 2005,1:30 pm Post # 16 see this member send this member a private message  quote this post in reply
Quote (AZKC @ May 15 2005,10:28 am)
Cause I run a V-8 not a 4 cylinder :beat There are 16 :laugh

Intake's smart ass... 8 intake lifters...  :rolleyes

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GoFastRacerMale Offline
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Post Icon Posted: May 15 2005,4:28 pm Post # 17 see this member send this member a private message  quote this post in reply
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 :rolleyes  but after a little better inspection of the lifters I have 5 that need changing out :break 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 :bebe  :rotflmao

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!.. :good
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AZKCMale Offline
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Post Icon Posted: May 15 2005,5:31 pm Post # 18 see this member send this member a private message  quote this post in reply
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 :break

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GoFastRacerMale Offline
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Post Icon Posted: May 16 2005,6:06 am Post # 19 see this member send this member a private message  quote this post in reply
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 :break

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!.. :good
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