Do OEM piston domes have to be deburred or is this usually an issue with aftermarket pistons?

 

I usully rub emory cloth around all the edges of new pistons I install.

 

Thanks for the reply, anyone else have anything to share?

 

I use a sand paper to sand out any sharp edges.

 

Like what 400 grit?

dude, is that chick naked in your avator?


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fox297 &raquo;</TD></TR><TR><TD CLASS="quote">I use a sand paper to sand out any sharp edges.</TD></TR></TABLE>

 

i use emory cloth as well...........

 

Depend on how much metal you want to take off the piston. I personally do not like sharp edges, especially the outer edge of the intake valve relief area. I use 220 grit then finish off with the 400 just to speed things up.

That chick is half-naked, I got it off of a F1 page.

 

Damn, I didn't know about deburring pistons when I installed my Je's. What's the advantage?

 

im sure there isnt that much metal to remove, the sharp edges are small so the emory cloth will work perfect.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20ek &raquo;</TD></TR><TR><TD CLASS="quote">Damn, I didn't know about deburring pistons when I installed my Je's. What's the advantage? </TD></TR></TABLE>
Tiny sharp edges and burrs are more vulnerable to heat, if they get hot enough they can actually glow and sometimes break off. Anyway, with symptoms like these it is a recipe for detonation. That glowing piece can actually ignite the fuel before the spark plug gets a chance to at the proper time. Thats about the best I can explain it, maybe someone else can explain it better.

 

Yes, any sharp edges in combustion chamber and on pistons can glow red and its the same as a spark plug igniting the A/F mixture......carbon deposits can also do the same thing. Just for good measure so you wont have detonation or preignition to lay your engine to an early death......preignition is like taking a big hammer to your piston on its way up to TDC......ignites before piston gets a chance to compress mixture completely almost trys to stop piston in its path. thats when you hear the death rattle known as pinging.

 

I wonder why Je doesn't tell you this when you buy pistons from them, or why they don't deburr the pistons prior to selling.

 

cause all they want is the money....and they are mass produced......the cost would then go up if they took the time for this task........

 

ic.... well they could at least inform people who are unaware. I wish I would have deburred my pistons but I can't now. I shouldn't have any problems though I hope.

 

Little stuff like this makes the difference between someone who bolts on crap and people who do the job right.

 

i know about hot spots but what is emory cloth?

 

It's like sandpaper, without the grit.

 

I use 3M-05150, 320-J.

 

Thanks for the responses guys.

But, do you have to deburr OEM pistons. I heard that this is usually a problem with aftermarket pistons.

I am asking this because I already installed the pistons (OEM CTR), I haven't put the crank in or anything else, though. I just don't want to have to push them out again if it is not necessary.