For any of y'all who have experience with M16's/M4's, you know how they teach you to 'offset' the gas rings on the bolt. See how the rings are in-line?

Here's the cylinder wall.

 

you crazy pat, but wish you luck! time to get some JUN cams!

 

What is wrong with the cylinder? If nothing re-ring that thing offset the rings and put it back together...

 

Nuttin'. Over on Nasioc, though, they're telling me that I definitely need to re-hone the cylinders and have to break the block apart in order to get the pistons back in.

 

That's craziness. Who would of that the military would offer up some useful knowledge? Kinda makes sense though. Good luck to ya.

 

Do what?

 

The post above yours makes no sense..But what ever is one of the lands or what ever they are called cracked the oil ring is the bottom one right and above that it looks like a crack. Actually that being the problem is not that bad and then again not too good..But at least you know what it is now.

 

I see the problem there is an open deck ! I'm glad to hear that you're making progress pat. JTech's post is refering to where Pat is talking about the gas rings on an M16.

 

Isn't that your ring land that is cracked in the pic? I can't really see tho'...
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Think that this is what he meant. I know that being in the military i have learned EXTREMELY useful amounts information that have had strange uses in totally different applications. I always offset my o-rings whenever i can. Its called "redundancy" i do believe. Force of habit for me now....

 

Here are some other pics (mostly the same thing but maybe easier to see.)

http://gpatmac.us/SubaruPics/New_Piston/4_a.jpg

http://gpatmac.us/SubaruPics/New_Piston/4_a2.jpg

http://gpatmac.us/SubaruPics/New_Piston/4_c.jpg

http://gpatmac.us/SubaruPics/New_Piston/4_d.jpg

http://gpatmac.us/SubaruPics/New_Piston/4_e.jpg

 

I'm a pretty firm believer in the semi-closed deck. I know that there are a tremendous amount of EJ engines that are making overwhelming power, but I have never heard of a cracked sleeve. Now, maybe there's a chance that sleeves flexing or something which stresses another part of the engine, like the pistons. Seems like whatever flex there is should be easily overcome with the added stability of those supports.

 

Thanks. So the ring land is cracked, right? Did you just mention the ring gaps all being lined up to point it out, but not imply that it's the whole problem? I'm a little slow at 7am. ;p
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Yeah i was talking about him offseting the gas rings. What did everyone think I was talking about??? Either way at least it got cleared up.

 

Well, I've never really stopped to think on why they always told us about offsetting the ring gaps on the bolt of the weapon, except to think that it did not not make sense, and that gaps all in a row (similar to a recurring dream I've been having) would be causal to lower compression and in the case of an engine, also a cause of excessive blowby.

I didn't put much more mind to it than that.