Sponsors/Engine Builders - Need ring gap info
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#11
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Re: Need ring gap info
I may as well chime in too.. This is how I would set the engine up for Street use with light NO2.
TOP RING: .006 per inch of bore dia.
MIDDLE RING: .005 per inch of bore dia.
so in your case, .024 on top, .020 in the middle.
TOP RING: .006 per inch of bore dia.
MIDDLE RING: .005 per inch of bore dia.
so in your case, .024 on top, .020 in the middle.
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Re: Need ring gap info
Hey Reckless.. I got the email back about the ring gaps from Chris. I asked him if he agreed with what he told me before and here it is:
That ring gap will be fine with up to a 150-200 shot. If you are going above that open them up to .018 top , .020 on the second. The center oil ring does not get filed. The rails that support it need to have .015 minimum and no more than .060
#15
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Re: Need ring gap info
Well, I will stake reputation and ASSURE you that it isn't .040 per inch of bore. I just think that .004 is too tight for a nitrous motor. That's fine if you want to go NA, but with the extra heat and pressure, if you go too tight on your top ring, you're going to pop your top ring land and grenade the motor.
Look at it this way, if you give it a few extra thousandths on top, you may sacrifice 10-15 PEAK NITROUS horsepower, but wouldn't that be worth it as insurance if you ever overheated the engine?
There are lots of tricks to running nitrous safely.. You can get a piston that puts the ring lands further down from the top, you can increase gap, yada yada.. There is no "RIGHT" way. Just several different preferences that engine builders use. Don't believe me?? Call 4 REPUTABLE engine builders and if you get the same answer from all 4, you can use my lift to do your motor swap!
Look at it this way, if you give it a few extra thousandths on top, you may sacrifice 10-15 PEAK NITROUS horsepower, but wouldn't that be worth it as insurance if you ever overheated the engine?
There are lots of tricks to running nitrous safely.. You can get a piston that puts the ring lands further down from the top, you can increase gap, yada yada.. There is no "RIGHT" way. Just several different preferences that engine builders use. Don't believe me?? Call 4 REPUTABLE engine builders and if you get the same answer from all 4, you can use my lift to do your motor swap!
#16
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Re: Need ring gap info
I thought the oil scraper was the bottom ring? Last time I did rings, I had to file the top two I believe, and did not alter the oil ring (scraper on bottom). This is getting more and more confusing
You have:
ring land 1 (top) compression ring #1
ring land 2 (second) compression ring #2
ring land 3 (bottom) Oil scraper ring (has top scraper, senter expander, and bottom scraper)
You dont touch the middle one (the funny lookin' up and down one ) You just file the top and bottom scrapers. You can have a big margin of gap because they arent under any pressure, they are just oil scrapers. Hence why most are low tension
Better?
#17
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Re: Need ring gap info
Bottom line, I'd call your piston manufacturer and ask them... Then call your Ring manufacturer and ask them.. That's the only way to be safe. I don't want to tell you the wrong info, the only motors I've set up for NO2 from the ground up were SBC Iron motors.
GOOD LUCK!
GOOD LUCK!