Piston ring placement
#1
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Gettin ready to install the piston and was looking over my old instructions from HPR just to refresh my memory. I came across something. "Ring and gaps should be opposite of each other once installed on the piston. On naturally aspirated engines- The top ringend gap should be positioned toward the intake side (call for nitrous applications)
I have a nitrous application so what is different with the ring placement?
I have a nitrous application so what is different with the ring placement?
#2
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#7
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Jed is exactly right about what is going on here. The 730 wants .023 of ring gap and I recommend calling.......even though they are not open right now and you want to proceed......the reason is there is no standard in this regard. If a stock bore piston requires 3 -5 thousands more gap, the 105.5 bore will have about 17% more circumference meaning you will have more ring length to expand. If you give it to much you might get excess smoking and blow by until you get a fair amount of heat built up in the engine. If you don't do enough, you might on a hot nitrous pass have those rings butt ends which will most likely ruin your nikasil liner. You might get it right so you avoid either extreme but......
I have to re-gap my rings now that I have decided to go Noss. What were you gapped before?
I have to re-gap my rings now that I have decided to go Noss. What were you gapped before?
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#8
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Originally posted by: 650VIPER
I put mine at 25. Take the rings off your piston, and stick them in your cylinder. Use a feeler gauge to check the gap. Use a small fine file to open them up if needed.
I put mine at 25. Take the rings off your piston, and stick them in your cylinder. Use a feeler gauge to check the gap. Use a small fine file to open them up if needed.
#9
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Im not sure I didnt check them on the first build. Simply put it together per instructions from HPR. Im going to check the old ones when I get to the shop. I will give HPR a call I know there closed but Im sure there there getting ready for planet sand. Maybe get an answer.
#10