High performance piston rings
#11
Registered
Cant go wrong with Total Seal conventional rings . Their Gapless wasn't that great but they did work . We Used the tool steel top , and a Napier second . Also used the Rikkens. They are good too.
#15
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iTrader: (3)
A good test would be , comparing ring seal at break in, and at 300 hours with a blowby meter.
Its been pretty much proven that low leakdown % isnt telling the story about how well a ring is sealing. Ive seen friends with total seal gapless rings push the dipsticks out, blow oil out the breathers, while their gapless ring still was showing like 5% leakdown on the gauge.
Its been pretty much proven that low leakdown % isnt telling the story about how well a ring is sealing. Ive seen friends with total seal gapless rings push the dipsticks out, blow oil out the breathers, while their gapless ring still was showing like 5% leakdown on the gauge.
#16
Registered
iTrader: (3)
A good test would be , comparing ring seal at break in, and at 300 hours with a blowby meter.
Its been pretty much proven that low leakdown % isnt telling the story about how well a ring is sealing. Ive seen friends with total seal gapless rings push the dipsticks out, blow oil out the breathers, while their gapless ring still was showing like 5% leakdown on the gauge.
Its been pretty much proven that low leakdown % isnt telling the story about how well a ring is sealing. Ive seen friends with total seal gapless rings push the dipsticks out, blow oil out the breathers, while their gapless ring still was showing like 5% leakdown on the gauge.
Last edited by mike tkach; 04-29-2016 at 08:58 AM.
#19
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iTrader: (3)
maybe time for a new leak gauge.through the years i have done a lot of lead down tests and the readings pretty much told the story.i have a snap on tester that i bought 20 years ago,it is a high quality gauge and i believe it is pretty acurate.i have seen the cheeper gauges that were pretty much useless.imo,if you have an engine that is blowing oil from the breathers and pushing the dip stick out their is no need to do a leak test as it is obviously leaking past the rings.
However, it has nothing to do with how the ring is sealing when there is 1500 psi in the cylinder, the piston traveling at 4000ft per minute, psi between the rings keeping the ring seated against the land, and so on.
Even the most expensive big power engines with big blowers , sometimes run puke tanks on them to catch the oil from the breathers.
My engines showed 15 percent leakdown when new, and still showed 15-18 percent leakage past the rings. Some guys would say thats too much. I dont care about the gauges reading. What matters, is that i have ran my boat over 400 miles, most of the time between 3/4 and wide open throttle, and didnt add a drop pf oil to the crankcase, nor had anything coming from the breathers. Shortly after that trip, i went on a fun run, where i ran 60 miles, where the engines never saw below 5,000 rpm, and spent most of the time at 5500 rpm. Again, no lost oil.
My engines have ran for the past 4 seasons , without a hiccup. But , ive always monitored air fuel ratio, and maintained them. I came off the dyno in 2012, with 82/92 jets . In the boat, at wide open, air fuel ratio was in the mid 12s, and dangerously lean in the high 13s at part throttle. I changed to 88/96 jets, gained speed, and now have a safer afr. Like you said though, a poor tune can kill rings and cylinder finish in a hurry. First thing ill be doing from here on out, is first time the engines come off the dyno and go in the boat, the afr will be on before i even get on plane .
After 100 plus hours at 800hp, the cylinders look like they were honed yesterday. Certainly not gonna look like that with a bad fuel tune.