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Old 02-04-2010, 12:09 PM   #26
Splinter
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Originally Posted by SUBARU RALLY GUY View Post
Dont weld the head at all, cut the head....... Weld and grind cam to match
Unfortunately not only do you have the expense of the labour of this, but there's also having to reshim all your valves on any affected cams

I'd prefer to find a solution with bearings if there is one to be found.
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Old 02-04-2010, 01:33 PM   #27
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Originally Posted by Splinter View Post
Unfortunately not only do you have the expense of the labour of this, but there's also having to reshim all your valves on any affected cams

I'd prefer to find a solution with bearings if there is one to be found.
Re lashing will not have to be done..... the cam rides in same location, just the main area is larger/ fatter to fit the new head journal diameter.
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Old 02-04-2010, 01:50 PM   #28
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This can be done. Using needle bearings ect. It would be very expensive. For ****s and giggles I called my friend Howard of AR Fabrication to see how much this would cost and what it basically comes down to is if you have to ask...well you know the answer.

If you were doing this on a set of $30k Ferrari heads and it cost say $2k per head then it is money well spent. If it cost's $2k per head and you can get brand new castings for way less then money not so well spent. I shot him a link so maybe he'll come in and explain it in better detail.

The option of cutting the caps and resizing, or honing the problem area out and welding and re-machining the camshafts is also a good idea but would still be very costly
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Old 02-04-2010, 03:21 PM   #29
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My machine shop is still working on it, apparently they use small journal rod bearings, or bronze inserts

They're looking into Jaguar parts atm
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Old 02-04-2010, 07:47 PM   #30
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Also a bronze bushing could be modified to work but it's still very labor intensive. I wonder if the cams can be welded and reground off center to give more lift and also fix a worn cam bore?
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Old 02-04-2010, 08:25 PM   #31
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Quote:
Originally Posted by Epic Motorsports View Post
This can be done. Using needle bearings ect. It would be very expensive. For ****s and giggles I called my friend Howard of AR Fabrication to see how much this would cost and what it basically comes down to is if you have to ask...well you know the answer.

If you were doing this on a set of $30k Ferrari heads and it cost say $2k per head then it is money well spent. If it cost's $2k per head and you can get brand new castings for way less then money not so well spent. I shot him a link so maybe he'll come in and explain it in better detail.
The guy I referred to in my original post above had bearings installed on his 2003 Cobra head for $150 per cam. Nobody's looking to do needle bearings or anything crazy like that, just regular bearings that would like like a crank main journal bearing (but smaller, of course). The point is to have an easily replaceable bearing surface so if it is damaged, you spend a small amount of money to buy a replacement bearing.

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Old 02-05-2010, 03:41 PM   #32
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Also a bronze bushing could be modified to work but it's still very labor intensive. I wonder if the cams can be welded and reground off center to give more lift and also fix a worn cam bore?
I'm not sure but one thing my machine shop recommended is if they can't find an exact fit bushing, having the cam journals machined down (or welded up) could make them an exact fit to another bushing

This would mean that any replacement cams would have to go through the same treatment, but it's still an option
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Old 09-27-2012, 10:05 PM   #33
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Sorry to bring this back to life, but is there any new news or updates on any of this solutions for scored cam journals. I have a set of Ver7 Big ports with pretty badly worned out cam journals.
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Old 09-29-2012, 02:02 PM   #34
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It's a shame you are not a machinist you could do it on your own time. Bronze bushings are cheap.
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Old 09-29-2012, 08:00 PM   #35
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I have a set of heads that could use this also
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Old 10-01-2012, 12:21 PM   #36
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Screw the cam bearing issue.....someone make me a set of ball bearings for my mains and rods lol
Now!!!!!!!!!!!!!! lol
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Old 10-01-2012, 05:38 PM   #37
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For what it's worth I have line honed a set of heads that had some bearing journal damage. If you line hone the journals, the the caps are then used to adjust the clearance as mentioned by someone else. This method could possibly cost more than fitting bearings however since you'll need to either trim the valve stems and or alter the buckets.

Minor scratches (or 1 scratch) can just be sanded out by hand but if the surfaces are scored badly (no oil pressure) then it's either scrap or needs to be line honed.

In the end the cost of fixing can get really close to replacing as doing this properly can easily approach $300 per cam journal. If the head is old or used hard it may need to be decked, a valve job, etc. and a new casting starts to look pretty good . To protect your perfect heads use a much bigger and better oil filter so when you have a bearing failure or debris the oil filter actually stops the the material instead of bypassing and pumping debris into the heads and turbocharger (like that small OEM filter will allow).
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