pmolitor Posted November 15, 2013 Author Share Posted November 15, 2013 Checked pyro, it is reading about 100degs hotter than it actually is. so I'm running at about 700 to 800 degs empty. looks like its back to.the pump shop. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216866 Share on other sites More sharing options...
rsb502 Posted November 15, 2013 Share Posted November 15, 2013 how did you check the pyro? Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216869 Share on other sites More sharing options...
pmolitor Posted November 15, 2013 Author Share Posted November 15, 2013 infrared thermometer. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216892 Share on other sites More sharing options...
gearhead204 Posted November 16, 2013 Share Posted November 16, 2013 whats your boost psi? when pulling. you said intake was not as clean as other truck cooler clean? or ruptured Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216937 Share on other sites More sharing options...
rsb502 Posted November 16, 2013 Share Posted November 16, 2013 Unless you found a way to get that thermometer to measure the gas in the middle of your downpipe that doest really work. The pyro thermocouple is long enough to read the temp of the exhaust gas in the center of the exhaust stream and under a load it will run anywhere from 100-300 hotter than surface temp of the pipe so a 200degree difference means its about right. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216955 Share on other sites More sharing options...
pmolitor Posted November 16, 2013 Author Share Posted November 16, 2013 didn't think of that. always learning something new. pump is coming off today. thougbt I was seeing oil oming out off exhaust ports, but after thinking about it all night( can't sleep) I bet its fuel. thanks far all your help 84superdog. I'll keep you posted. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-216963 Share on other sites More sharing options...
pmolitor Posted November 21, 2013 Author Share Posted November 21, 2013 Got the truck back from Mack today. Runs great. The bypass valve in the tip turbine had a massive failure! It was only found after completely disassembling the tip turbine. Also low on fuel pressure. At some time before I owned the truck, someone added a hose from the top of the fuel filter housing to the return line. No one knows why. They also figured my pyro gauge is between 100 and 200 degrees hotter than actual. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217811 Share on other sites More sharing options...
rsb502 Posted November 21, 2013 Share Posted November 21, 2013 Glad you got it fixed, I never would have come up with that without tearing into the truck, I don't know enough about how the tip turbines operate, I'm glad there are still some real Mack mechanics out there. 1 Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217816 Share on other sites More sharing options...
gearhead204 Posted November 21, 2013 Share Posted November 21, 2013 can anyone give me the low down on a tip turbine? how does it work whats its purpose hate being this stupid !! what engines used it ? Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217822 Share on other sites More sharing options...
stsdavew Posted November 21, 2013 Share Posted November 21, 2013 can anyone give me the low down on a tip turbine? how does it work whats its purpose hate being this stupid !! what engines used it ?pretty good description here with diagram!http://www.bigmacktrucks.com/index.php?/topic/7899-tip-turbine-cool-power-hows-it-work/ 1 Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217855 Share on other sites More sharing options...
gearhead204 Posted November 22, 2013 Share Posted November 22, 2013 thank you feel a little smarter now and I didn't even stay at a holiday inn express!!!!!!!!!!!! Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217924 Share on other sites More sharing options...
pmolitor Posted November 22, 2013 Author Share Posted November 22, 2013 good link. wish I would've seen that a month ago. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-217933 Share on other sites More sharing options...
daisyjohn Posted December 16, 2013 Share Posted December 16, 2013 Over fueling will blow black smoke, running lean is the opposite and will blow white smoke, although not a lot, it leaves more of a white residue in the mufflers. White smoke is more likely oil to be frank. Possibly coolant, but more likely oil blowing past turbo seals. To fix your over-fueling you need to get it tuned. Any zed with a stock tune and boost past 12psi will over-fuel. It's designed to run overly rich to cool the cylinder temps. Quote Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-221691 Share on other sites More sharing options...
farmer52 Posted December 16, 2013 Share Posted December 16, 2013 Over fueling will blow black smoke, running lean is the opposite and will blow white smoke, although not a lot, it leaves more of a white residue in the mufflers. White smoke is more likely oil to be frank. Possibly coolant, but more likely oil blowing past turbo seals. To fix your over-fueling you need to get it tuned. Any zed with a stock tune and boost past 12psi will over-fuel. It's designed to run overly rich to cool the cylinder temps.Burning oil creates BLUE smoke. Unburned fuel is white. Coolant can also be whitish. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/32256-overfueling/page/3/#findComment-221700 Share on other sites More sharing options...
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