Piston Rings
03-21-2017, 08:21 AM
#11
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I built a couple of 509's for a friends Campion chase. I hate to say this, I have never done this before and will never do it again, long story. Both engines were built exactly the same except for rings. I had Plasma moly file to fit in one engine and total seals file to fit gapless rings in the other. After we broke them in, we gave them a wide open run. He said what's up? I have to throttle back the port engine to keep them in sink. I didn't have the heart to tell him that I had put the gapless rings in the port engine and not the other. I had built the engines the first go around with molly rings and they didn't have this issue. That is the only real test I have.
03-21-2017, 08:51 AM
#13
Geronimo36
Gold Member
I stopped using gapless rings about 10 years ago. I wasn't happy with the way they sealed on my engines. They consumed about a quart of oil every couple of hours and would pop the dipstick under boost. I was told the wrong cylinder wall finish was probably the cause but every engine I've torn apart since then that had oil consumption issues, either had GM Metric rings or Gapless rings with glazed cylinder walls. I'm not a believer in the gapless, not my cup of tea.
03-21-2017, 09:20 AM
#14
I have never tried the gapless, so no comment there, but after doing 3 different BBC drag race builds my machinist got a new very expensive honing machine. I will have to say that this last build with a hone from this new machine seemed rougher than normal but this motor sealed up fast and has no blowby. I have used the same ring pack on all 3 motors. The motor I just buillt for my boat also has this diamond hone but I cannot comment yet as it only has dyno time. All of them have file fit rings and really is not a big deal if you have time and pay attention. I use the summit hand filer screwed to a bench.
03-21-2017, 09:15 PM
#16
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Join Date: Apr 2015
Location: sw michigan
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all my parts will be here by tomorrow this is my first marine build, ring gap? is marine different from standard automotive, I run in lake Michigan cold water? never seen water temp above 160 seems low to me, do I tighten the gap or did some idiot put the wrong thermostat in her. The later seems more likely bought it cheap cheap, timing was retarded 12 degree, junk carb I got two good seasons out of it before the fuel pump filled the crank case with fuel and washed the bearings. not a hint of ridge on the bores, this boat spent most of its time tied to the dock with leaky risers.
03-21-2017, 09:42 PM
#17
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i can tell you that my 2012 honda accord calls for 0w20.i noticed it would use a quart or so in 5000 miles,for chits&giggles i tried 5w30 and it used no oil.the car stays in the heated garage most of the time so i am going to stick with the 5w30.with the 0w20 it would blow a puff of smoke upon startup,i don,t see that with the 5w30,i forgot to mention i use mobil one in all my late model cars.i am thinking honda calls for the 0w20 to help gas mileage numbers,idk.
5w-30 was invented for better fuel economy also ,,, way back when but does well with modern engines.
The lighterweight oils are all about fuel economy. Read about C.A.R.B. and you will really realize what the manufacturers are up against with fuel mileage...especially Ford.
03-21-2017, 09:46 PM
#18
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Thickness and tension of the rings seems to be the biggest + or - horsepower 'effecter' with rings.
