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Author
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Topic: Bedding in rings and cam?
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Dave and Shellie 364
Journeyman Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001
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posted 07-22-2001 06:10 PM
  
Help! I need advice on bedding in my piston rings,i ran C/A duramoly rings before the block cracked,when doing a leak down test i was down on 3 cylinders, is bedding in the rings sufficient when running in the cam or is more attention needed?.I see one thread saying 25-30 runs.Also with only doing a running in period with my crane solid lifters and crane cam and about 20 1/4 mile runs would i have to change them if i went to a bigger crane cam after so little use.Plus what oil would you suggest for running in.Sorry for all the questions but we have far to few people running clevelands over here.
Ta David
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 07-22-2001 08:09 PM
I like to run in a cam at 2500 rpms for 20-30 minutes. After that I drive fairly easy for 500 miles, then go bananas. I'm not sure what that translates to with a drag-only engine.I would bet all this cracking we've seen happens because people aren't sonic checking for cylinder wall thickness. Are you? ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look! [This message has been edited by SteveLaRiviere (edited 07-22-2001).]
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 07-22-2001 08:10 PM
For the oil, I'd say any quality oil that isn't synthetic.------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-22-2001 08:47 PM
No, I dont sonic test my blocks.  When I run a solid flat tappet cam, I run the cam in and seat the rings with a good petroleum oil. I run it the first week only in my race motors, then switch to Royal Purple synthetic. I have even gone so far as to run them about an hour in the garage with the petro oil then switch them. I have never had a problem with the rings seating, dumb luck I guess.
I think the finish in the bore plays a bigger role in how fast the rings seat than the type of oil you use. But, I'm not a professional engine builder, so take that for what it's worth.
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Dave and Shellie 364
Journeyman Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001
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posted 07-23-2001 06:38 PM
No steve i afraid i don't sonic check my blocks due to the fact that the engines are normally complete when we find them and the vendors would not normally be pleased if we took them away strip them down and give them back if they are not suitable.I do have a spare bare block in my garage which i will see if i can find somewhere to check it out.On a 030" over bore what thickness would you consider safe for performance use?
Thanks for the help so far
David
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