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Cylinder scratches #2613126
01/27/19 06:19 PM
01/27/19 06:19 PM

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69cornetr/t
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Well I have my opinion but I want to hear from people that know. Check out these scratches tell me what made them they are in all cylinders but this one caught my eye that alerted me to the rest. There is brown in the scratches, kinda of a mixture of nasty oil condensation and rust but it wipes off. The engine has been sitting awhile. Now, I can't hardly feel them with my fingernail, but I can with my finger.

20190127_134518.jpg20190127_134725.jpg
Re: Cylinder scratches [Re: ] #2613137
01/27/19 06:36 PM
01/27/19 06:36 PM
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Pull it apart, clean it, dingle berry hone it (lightly) and run it. Measure the clearances and make sure the are correct while you're in there.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Cylinder scratches [Re: ] #2613141
01/27/19 06:41 PM
01/27/19 06:41 PM
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Look like old grey forged trw-s or such, id have to guess your .005 isnt enough, more like .008-.009 or better.

Re: Cylinder scratches [Re: ] #2613153
01/27/19 07:09 PM
01/27/19 07:09 PM

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Ya kinda confirms what I was thinking.

Re: Cylinder scratches [Re: Porter67] #2613155
01/27/19 07:13 PM
01/27/19 07:13 PM

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69cornetr/t
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Pretty good eye you are correct on the pistons

Re: Cylinder scratches [Re: ] #2613159
01/27/19 07:18 PM
01/27/19 07:18 PM

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69cornetr/t
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Really think it's necessary to tear down and rehone and regap? It's got a 1000 miles on it,but they are quarter mIle hard miles nothing above 6000. In my mind I probably should but I just wanted to avoid that.I need to hear some nonbiased opinions

Re: Cylinder scratches [Re: ] #2613171
01/27/19 08:12 PM
01/27/19 08:12 PM
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Val-haul-ass... eventually
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Originally Posted By 69cornetr/t
Really think it's necessary to tear down and rehone and regap? ... In my mind I probably should but I just wanted to avoid that.I need to hear some nonbiased opinions

Non-biased opinion: It's ugly in there and should be torn down and dealt with.

However, that's obviously not the answer you want to hear.

Re: Cylinder scratches [Re: ] #2613177
01/27/19 08:24 PM
01/27/19 08:24 PM
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Duloc
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Your oil isn't hot enough before beating on it

Re: Cylinder scratches [Re: Porter67] #2613190
01/27/19 08:45 PM
01/27/19 08:45 PM
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Bend,OR USA
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Originally Posted By EV2Bird
Look like old grey forged trw-s or such, id have to guess your .005 isnt enough, more like .008-.009 or better.

Those skirts are not like the newer TRW and speed Pro forged 440 pistons, they looklike the original forged 426 M.W TRW pistons shruggy
Did you gap the rings and deburr the ring ends? If not you should have tsk If you did then those scratches maybe from junk suck into the cylinders and got stuck between the top of the pistons above the ring lands and cylinder walls scope

Last edited by Cab_Burge; 01/27/19 08:46 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Cylinder scratches [Re: ] #2613226
01/27/19 10:08 PM
01/27/19 10:08 PM
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To me they look just like the trw replacements from the early 70-s.

OP. what motor is this? What do you know about the pistons.

DSC00062.JPGDSC00064.JPG
Re: Cylinder scratches [Re: Porter67] #2613253
01/27/19 10:58 PM
01/27/19 10:58 PM

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It's 68 440 I built it in the 80s, used trw pistons,l and used a ring filer and checked the gap inside a fresh bored 030 block. But the did sit a couple years at a time. I used to run it at the track. Damn good motor ran 12s in a challenger. Was just going to swap it to another car thought I'd take peek inside.Ring gap was dead nuts on when I put it together.chrome moly

Last edited by 69cornetr/t; 01/27/19 11:18 PM.
Re: Cylinder scratches [Re: madscientist] #2613265
01/27/19 11:22 PM
01/27/19 11:22 PM
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I agree..... Freshen it and run the piss out of it...


Bob(Cowboy)Hogan
Monrovia So-Cal
Re: Cylinder scratches [Re: ] #2613278
01/27/19 11:45 PM
01/27/19 11:45 PM
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Originally Posted By 69cornetr/t
Damn good motor ran 12s in a challenger.


I've always thought it was pretty amazing how imperfect things can be and still function admitably well for what they are.

Myself I would hand hone or machine shop touch hone and re ring it, but.....If you don't, it will be just as good as it was. I'm more inclined to repair and improve things while they are apart.


Rich H.

Esse Quam Videri




Re: Cylinder scratches [Re: ] #2613334
01/28/19 01:49 AM
01/28/19 01:49 AM
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I would have it honed on a good Sunnen honing machine with a torque plate to remove the scratches and make the cylinder round and seal good up twocents
Once you get the heads off you will be able to see more, sometimes things look a lot worse than they are shruggy work scope
How many runs on the motor and rings?
If more than 30 put new rings in it up
I don't like or use low tension oil rings any more unless the motor has a vacuum pump on it twocents
Please let us know what you find and decide to do thumbs


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Cylinder scratches [Re: ] #2613379
01/28/19 04:43 AM
01/28/19 04:43 AM
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What weight oil and what is the coolant temp when staging the car?

Take it apart and check clearance.

Re: Cylinder scratches [Re: ] #2613402
01/28/19 09:50 AM
01/28/19 09:50 AM

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20 50 @ 180 degrees , but it's a street engine now . I'll take the heads off and get a better look. But most likely i will take it apart and fix it right because it will always bug the [censored] out of me if don't . I'll see what my machinist says first.

Re: Cylinder scratches [Re: ] #2613419
01/28/19 10:43 AM
01/28/19 10:43 AM
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If the scratches aren't deep with nothing protruding it is what it is. If it gets honed to true it up remove everything chances are the piston to wall could be excessive. What is the purpose of honeing and leave the scratches? Make it pretty?.
Looks like a low buck piece. I'd run it.
Doug

Re: Cylinder scratches [Re: ] #2613422
01/28/19 10:50 AM
01/28/19 10:50 AM
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Could always hone it and spend a couple hundred bucks and get the skirts coated.

Re: Cylinder scratches [Re: dvw] #2613425
01/28/19 11:03 AM
01/28/19 11:03 AM

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True Doug you make a good point

Last edited by 69cornetr/t; 01/28/19 11:04 AM.
Re: Cylinder scratches [Re: ] #2613426
01/28/19 11:10 AM
01/28/19 11:10 AM

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I'll take the heads off go from there and throw some trick flows on it and beat on it some more, and have fun, that's what it's all about for me

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