mowerman Posted 7 hours ago Share Posted 7 hours ago I’m thinking the turbo like a few years ago they were all very loud… bob Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574717 Share on other sites More sharing options...
Joseph Cummings Posted 6 hours ago Share Posted 6 hours ago I wonder how clean the cooling air supply to the intercooler has to be. I would guess it wouldn't have to be as clean as the combustion air going into the engine. You wouldn't want stuff going in that would "sand blast" the blades in the tip turbo, or anything going in that could build upon the heat exchange surfaces. CMCAC doesn't use any filter. Big thing is the air be cold and there be enough of it Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574722 Share on other sites More sharing options...
mrsmackpaul Posted 4 hours ago Share Posted 4 hours ago I think you all are missing the big issue here, the motor is sucking unfiltered air back thru the intercooler There's nothing to stop air entering the intercooler outlet and through the intercooler backwards and straight through to the motor I'm thinking the air will take the path of the least resistance Maybe the turbine is so loud because when it is been driven it is driving against air that's already going the wrong way Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574729 Share on other sites More sharing options...
mrsmackpaul Posted 4 hours ago Share Posted 4 hours ago And intercooler would have to be filtered If something happened to the valve that feeds the turbine you could easily suck dirty air into the motor Paul Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574730 Share on other sites More sharing options...
Joseph Cummings Posted 4 hours ago Share Posted 4 hours ago 13 minutes ago, mrsmackpaul said: There's nothing to stop air entering the intercooler outlet and through the intercooler backwards and straight through to the motor I could see that happening when it's sitting there idling, or when the air filter is half plugged up. I wonder if the combustion air filter, and the intercooler filter elements filtered down to the same microns. Not sure if I've ever seen the valve on a tip turbo fail, replaced some that the bearings failed in. Then again back then they were all pretty new trucks, now those damn valves are 45 or 50 years old Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574734 Share on other sites More sharing options...
Geoff Weeks Posted 3 hours ago Share Posted 3 hours ago 41 minutes ago, mrsmackpaul said: I think you all are missing the big issue here, the motor is sucking unfiltered air back thru the intercooler There's nothing to stop air entering the intercooler outlet and through the intercooler backwards and straight through to the motor I'm thinking the air will take the path of the least resistance Maybe the turbine is so loud because when it is been driven it is driving against air that's already going the wrong way Paul yes, I never thought about that! Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574736 Share on other sites More sharing options...
Mark T Posted 1 hour ago Share Posted 1 hour ago 5 hours ago, Joseph Cummings said: I wonder how clean the cooling air supply to the intercooler has to be. I would guess it wouldn't have to be as clean as the combustion air going into the engine. You wouldn't want stuff going in that would "sand blast" the blades in the tip turbo, or anything going in that could build upon the heat exchange surfaces. CMCAC doesn't use any filter. Big thing is the air be cold and there be enough of it They didn't require super clean air. Trucks with a strata tube I don't think even used a filter, just the scoop and some cyclonic (?) action in the tube. I can't for the life of me remember what the inside of one of those air cleaners with the over and under outlets looked like inside. But I do remember one filter was for the engine and one was for the tip turbine. (where's Mech ???) Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574748 Share on other sites More sharing options...
Joseph Cummings Posted 10 minutes ago Share Posted 10 minutes ago 40 minutes ago, Mark T said: They didn't require super clean air. Trucks with a strata tube I don't think even used a filter, just the scoop and some cyclonic (?) action in the tube. I can't for the life of me remember what the inside of one of those air cleaners with the over and under outlets looked like inside. But I do remember one filter was for the engine and one was for the tip turbine. (where's Mech ???) Tall filter, and short filter with a separator plate in between them. After the intake on top which they shared, two totally different filters and ducting. The hood scoop ones I think was only 1973 model year same time they went to plastic dash and the plus 3 cab. I know there was some kind of air cleaner under the scoop, but I can't remember what was in it. We only ever owned one, and not for long maybe a year. A guy from Runnemede NJ bought it and was using it to haul steel and somehow ended up flipping it. Shame because it was a really nice truck. After he recovered he put a new cab and hood on it and did away with the scoop Quote Link to comment https://www.bigmacktrucks.com/topic/75434-back-in-the-mack-pack/page/4/#findComment-574750 Share on other sites More sharing options...
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