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Re: Cylinder scratches [Re: ] #2613432
01/28/19 11:36 AM
01/28/19 11:36 AM
Joined: Jan 2003
Posts: 2,296
NE Ohio
DoubleD Offline
top fuel
DoubleD  Offline
top fuel

Joined: Jan 2003
Posts: 2,296
NE Ohio
To me it looks like just about every old TRW heavy slug - stock rodded engine after a few years of running! - the skirts on those pistons always seem to have had a funky edge on them from the forging process - we used to dress them with a honing stone. If it has good ring seal now run it if not - give it a quick dingle ball hone hone and run it - those pistons are pretty forgiving when it comes to clearence as long as its not too tight.

Re: Cylinder scratches [Re: Cab_Burge] #2613674
01/28/19 08:35 PM
01/28/19 08:35 PM

6
69cornetr/t
Unregistered
69cornetr/t
Unregistered
6



This for everyone who wanted to know.
Talked to my machinist, who's also a drag racer take a piston out look at it and ,"if it's not black death don't worry about it" which is the skirt gaulding the cylinder wall leaving black lines on the piston skirt.clean the cylinder wall with WD40
So I'm good to go.

Re: Cylinder scratches [Re: ] #2613698
01/28/19 09:22 PM
01/28/19 09:22 PM
Joined: Sep 2014
Posts: 4,457
Washington
M
madscientist Offline
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madscientist  Offline
master
M

Joined: Sep 2014
Posts: 4,457
Washington
Originally Posted By 69cornetr/t
This for everyone who wanted to know.
Talked to my machinist, who's also a drag racer take a piston out look at it and ,"if it's not black death don't worry about it" which is the skirt gaulding the cylinder wall leaving black lines on the piston skirt.clean the cylinder wall with WD40
So I'm good to go.



If they are only black on the back side i.e. the non thrust side that's from running a plug that's too hot. I've seen it many times. Back siding is usually the wrong plug.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: Cylinder scratches [Re: ] #2613708
01/28/19 09:53 PM
01/28/19 09:53 PM

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69cornetr/t
Unregistered
69cornetr/t
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Really? No black,but When you say back side do you mean toward the cam and why would a hot plug cause that? Running lean?

Re: Cylinder scratches [Re: ] #2613843
01/29/19 02:30 AM
01/29/19 02:30 AM
Joined: Oct 2004
Posts: 3,097
back in Georgia
dthemi Offline
master
dthemi  Offline
master

Joined: Oct 2004
Posts: 3,097
back in Georgia
Run it. The scratches are what they are, and were there when you ran it last. That little bit of surface rust will hurt nothing. That'll get wiped off in an instant. Then if there is any tiny pits, they'll just hold oil.

Also those are nothing in terms of scratches from what i see in the pictures.

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