ring gap questions
- Thread starter Modular2v
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txstang84
15 Year Member
what kind of pistons? most forged pistons use 0.004" per 1" of bore for N/A apps with the exception of KB-they have different req's for ring gap because of alloys and machining.
if using power adder open it up a couple thousandths...
in the past, I've usually put the top rings at 0.018", and the second ring at 0.016" , and yes that's for a 4.030" bore. Never had any issues with that...
if using power adder open it up a couple thousandths...
in the past, I've usually put the top rings at 0.018", and the second ring at 0.016" , and yes that's for a 4.030" bore. Never had any issues with that...
bluevenom867
I will have images of molesting stuffed animals in
Secondary gap will be larger than the primary ring gap.
You can also call the piston manufacter and ask what they suggest.
You can also call the piston manufacter and ask what they suggest.
Assuming you ordered them from probe they will most likely be a Perfect Circle, just follow there instructions for what ever application you will be using.
I know they have the top and second rings with the same gap on the sheet, gap the second .002-.004" WIDER
I know they have the top and second rings with the same gap on the sheet, gap the second .002-.004" WIDER
Jason 302
10 Year Member
It's interesting how gap recommendations have changed. My old man said years ago they always said to gap your top ring wider because it took more heat than the second and therefore expanded more and needed the extra clearance. But when I built my first motor a few years back the directions said to gap your second ring wider, because it would help gases that built up between the two ring escape, and prevent the first ring from wanting to lift off it's land. What's your take on this Rick???? 
How do you set ring gap? My shop teacher said they were preset. Also, how do you set the openings? The gaps of my 1st and 2nd were lined up like this:
____
....... ____
and my oil rings looked like that or they were like this:
___
___, with the expanding one in the middle.
Hope that prints the way I typed it. Anyways, he said they should be on opposite sides of each other. Thanks for your help and I hope I didn't hijack the thread.
____
....... ____
and my oil rings looked like that or they were like this:
___
___, with the expanding one in the middle.
Hope that prints the way I typed it. Anyways, he said they should be on opposite sides of each other. Thanks for your help and I hope I didn't hijack the thread.
Well they never changed to "gap the top less" now. The gap hasn't really changed for the top ring, even though it takes the most heat. The only change is they want the 2nd ring a little wider so as to vent the gases and help eliminate ring flutter (so a pressurized pocket of air doesn't build up between the two and have nowhere to go).Jason 302 said:It's interesting how gap recommendations have changed. My old man said years ago they always said to gap your top ring wider because it took more heat than the second and therefore expanded more and needed the extra clearance. But when I built my first motor a few years back the directions said to gap your second ring wider, because it would help gases that built up between the two ring escape, and prevent the first ring from wanting to lift off it's land. What's your take on this Rick????
Modular2v said:
If you do not file a "file to fit" ring they will butt together, have no gap and destroy the cylinder walls and pistons. If you buy a pre gapped set you get what you get....maybe not what you want or need.
Rings are filed and matched for the cylinder, then de burred then installed.
Ring Flutter is a huge issue and can cause broken rings, lifted lands and blow by, keeping them stable especially on a power adder motor is very important!
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