Checking camshaft run out.
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Checking camshaft run out.

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    Senior Member holorinhal's Avatar
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    Default Checking camshaft run out.

    When checking camshaft runout, is it acurate enough to use a set of home made wood V-blocks?

    A while back, i made a set of v-blocks for checking crankshaft run out and it works prety good and i have bouble checked it with checking the crank in a block, sitting on the two end bearings and get the same readings, but a crankshaft is heavy!

    A couple of weeks ago, i was curious and wanted to check the cam run out. i set the cam up in the vblocks and set the dial indicator on the center cam journal. Rotated the cam and the needle is back and forth all over the place!
    I tried fitting the cam back in the bearings and it will only go in about half way and it actually will get stuck. I dont even know how the guy got the dam thing out!
    To double check my vblock's, i have another cam that i set up and the dial indicator read less than .001 movement.
    I guess I have prety much answered my own question, I am pretty sure the dam cam is bent!

    I was just wondering if anyone has used wood vblock's, with success?

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  3. #2
    gn7
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    Quote Originally Posted by holorinhal View Post
    When checking camshaft runout, is it acurate enough to use a set of home made wood V-blocks?

    A while back, i made a set of v-blocks for checking crankshaft run out and it works prety good and i have bouble checked it with checking the crank in a block, sitting on the two end bearings and get the same readings, but a crankshaft is heavy!

    A couple of weeks ago, i was curious and wanted to check the cam run out. i set the cam up in the vblocks and set the dial indicator on the center cam journal. Rotated the cam and the needle is back and forth all over the place!
    I tried fitting the cam back in the bearings and it will only go in about half way and it actually will get stuck. I dont even know how the guy got the dam thing out!
    To double check my vblock's, i have another cam that i set up and the dial indicator read less than .001 movement.
    I guess I have prety much answered my own question, I am pretty sure the dam cam is bent!

    I was just wondering if anyone has used wood vblock's, with success?
    Chances are, when that thing came apart, the broken rod nailed the cam. Its not that unusal. If you can feel the cam stick, its bent.
    Look for a spot around where the rod that broke would hit it, and see if there is any marks.



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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by holorinhal View Post
    When checking camshaft runout, is it acurate enough to use a set of home made wood V-blocks?

    A while back, i made a set of v-blocks for checking crankshaft run out and it works prety good and i have bouble checked it with checking the crank in a block, sitting on the two end bearings and get the same readings, but a crankshaft is heavy!

    A couple of weeks ago, i was curious and wanted to check the cam run out. i set the cam up in the vblocks and set the dial indicator on the center cam journal. Rotated the cam and the needle is back and forth all over the place!
    I tried fitting the cam back in the bearings and it will only go in about half way and it actually will get stuck. I dont even know how the guy got the dam thing out!
    To double check my vblock's, i have another cam that i set up and the dial indicator read less than .001 movement.
    I guess I have prety much answered my own question, I am pretty sure the dam cam is bent!

    I was just wondering if anyone has used wood vblock's, with success?
    I would consider getting it to a cam grinder if the shop you are using can't help. If you can get it to me I can have it checked free, and if it can be straightened, he can do it

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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by gn7 View Post
    Chances are, when that thing came apart, the broken rod nailed the cam. Its not that unusal. If you can feel the cam stick, its bent.
    Look for a spot around where the rod that broke would hit it, and see if there is any marks.
    Yes Bob, There is a very slight mark on one lobe.

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    Quote Originally Posted by holorinhal View Post
    Yes Bob, There is a very slight mark on one lobe.
    I have seen many cams straightened. The guy who does mine checks and straightens both prior to grinding and after it's ground. Pretty wild to watch him take a hammer and chisel to a cam in the fixture!

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    I have seen many cams straightened. The guy who does mine checks and straightens both prior to grinding and after it's ground. Pretty wild to watch him take a hammer and chisel to a cam in the fixture!
    For me, it would totally depend on the camshaft, I would have to be stupid happy with it to go through the straightening process on a used cam that sustained damage during a rod throwing contest, one of those things that would always be in the back of my mind.

    Probably just me though.
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    gn7
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    Quote Originally Posted by GT Jets View Post
    For me, it would totally depend on the camshaft, I would have to be stupid happy with it to go through the straightening process on a used cam that sustained damage during a rod throwing contest, one of those things that would always be in the back of my mind.

    Probably just me though.
    I have been thru this twice with cams that were bent between journals, which all cams hit by a rod are. And neither time could they be straightened. They aren't bent or warped from heat treat, they are kinked. The distance between any two journals is so short that the bend is usually to severe in one spot to straighten successfully. Then add in that the cam is almost certainly damaged somewhere. The odds of hitting the cam with a rod and not hitting a lobe are somewhere between nil to zero. So now it needs to be reground. To what, the same profile? Some thing else. Straighten plus regrind? If it was some custom ground 60 MM deal I might consider it. But then, if it was a bent 60 MM, you know it had to take a wacking. Throw the POS in the round can next to the bench.



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    Last edited by gn7; 01-17-2014 at 12:07 AM.

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    Quote Originally Posted by GT Jets View Post
    For me, it would totally depend on the camshaft, I would have to be stupid happy with it to go through the straightening process on a used cam that sustained damage during a rod throwing contest, one of those things that would always be in the back of my mind.

    Probably just me though.
    Quote Originally Posted by gn7 View Post
    I have been thru this twice with cams that were bent between journals, which all cams hit by a rod are. And neither time could they be straightened. They aren't bent or warped from heat treat, they are kinked. The distance between any two journals is so short that the bend is usually to severe in one spot to straighten successfully. Then add in that the cam is almost certainly damaged somewhere. The odds of hitting the cam with a rod and not hitting a lobe are somewhere between nil to zero. So now it needs to be reground. To what, the same profile? Some thing else. Straighten plus regrind? If it was some custom ground 60 MM deal I might consider it. But then, if it was a bent 60 MM, you know it had to take a wacking. Throw the POS in the round can next to the bench.
    I offered to have it checked for free for him, can't beat that with a stick?

    The ones I have seen straightened were not damaged by engine failures, just routinely checked before grinding.

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    I offered to have it checked for free for him, can't beat that with a stick?

    The ones I have seen straightened were not damaged by engine failures, just routinely checked before grinding.

    Not saying anything negative your way Barry, just think that even if there was a question about the condition of a cam from an internal event, the cam would be wall art...

    holorinhal has had enough dram IMHO.

    Super cool of you to offer that up... First class bud.
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Quote Originally Posted by GT Jets View Post
    Not saying anything negative your way Barry, just think that even if there was a question about the condition of a cam from an internal event, the cam would be wall art...
    Guess that was my point of offering to get it checked by a pro,, no guessing.

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    Quote Originally Posted by obnoxious001 View Post
    I have seen many cams straightened. The guy who does mine checks and straightens both prior to grinding and after it's ground. Pretty wild to watch him take a hammer and chisel to a cam in the fixture!
    first time I saw that done I was scratching my head for a bit. I'd think a billet cam would have some memory and just spring back after a while.

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    Quote Originally Posted by Sleeper CP View Post
    first time I saw that done I was scratching my head for a bit. I'd think a billet cam would have some memory and just spring back after a while.
    LMAO!.......

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    Quote Originally Posted by PS&B1 View Post
    LMAO!.......
    I was like ...... " how the hell is whacking that thing with a hammer and chisel going to fix it?" ..... part of the reply was " .... where do you think the term " get a bigger hammer came from" that didn't really help my comfort level .....

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    gn7
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    Quote Originally Posted by Sleeper CP View Post
    first time I saw that done I was scratching my head for a bit. I'd think a billet cam would have some memory and just spring back after a while.
    They can. Seen it.
    Next we will be talking about straightening bent push rods They should stay straight........for about 10 revolutions

    Its one thing to straighten a cam that has a bow in it. Same with crankshafts. When its bent between 2 journals and its that obvious, its junk.
    It makes think about taking a rod bolt that's been stretched and putting in a vice and squeezing it back. I am sure somebody has thought of it.



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    Last edited by gn7; 01-17-2014 at 10:12 PM.

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