Burn'n the midnight oil

[importredneck]

hey wandering if anybody can help me out i have a 91 240sx with an rb20det t3 on 15psi, recently the beast decided to start burn'n oil like royal purple grows on trees, anyway i check both sides of the turbo no leak intake is clean( thank you air water separator) the spark plugs are clean but ashed a bit, and i peaked into the chamber and there was darkness good old black gold, i'm leaning to the rings but if anybodies got a better clue then me i'm all ears. i also would like some help finding a nice set gapless would be nice.

[Sil240]

Hey,Whats going on broI'm right up in Ft Lauderdalewhats your email?Maybe we could help each other out.Got a S13 with a RB20 also

Do a leakdown test.It'll tell you if you are losing compression and it'll tell you from where. (ie. valves, rings, etc...)

[240z4u]

Yeah leakdown, or at very least, compression test.

Your 100% sure your turbo does not have cooked seals? 15psi is a bit high for stock wheels too.

Evan

[importredneck]

=( the rings are shot time to call in the troops and a couple of favors get me some cheap labor haha look me up at http://www.myspace.com/importredneck.....i've contacted total seal to see if they make rings for my little rb, i'm also looking up somehting i saw a while back aboout using an rb25 head on the rb20 for the bigger valves

[Darius]

Good luck finding rings aftermarket or otherwise. I ended up buying new pistons. Intuition would point me away from gapless rings. Sounds like an overkill modification that could end up blowing up in your face. I would recommend sticking with file fit rings and follow the manufacturer's specs. Anyone else want to chime in on this one?

[ISUJinX]

I'm with Darious on the file fits. Even those are probably overkill, but rather be safe than sorry. New sets of forged pistons often come with high quality rings *nudge nudge* The big questions you run into for picking rings are fuel type, compression, HP and heat. Fuel, comperssion and HP are all (mostly) predictable. For something running 15PSI, I would definately, definately reccomend at least a Moly ring, if not a special heat coated one. I'd stay away from Plasma-Moly because it tends to flake off because of thermal soak. Take care in file fitting rings, and make -sure- you get them deburred well, and gapped properly. Too tight of rings will rob HP, increase wear and sometimes break the rings. Too loose and you'll get lots of blow-by ... which won't help your oil problem :-p.

Gapless rings are a cool concept... but as far as I know suited more for low emissions, low heat and compression engines because they tend to tighten a lot more under increased thermal load (due to having more, and thinner, metal.

[Carl H]

ive been told if you are gonna run gapless rings then run the first compression ring as gapless and the second as std file fit.altho im gonna be honest ive no experience when it comes to picking rings, i just used the rings that cp supplied.