Popular Post Ezrider Posted April 13, 2018 Popular Post Share Posted April 13, 2018 3 Quote Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/ Share on other sites More sharing options...
terry Posted April 13, 2018 Share Posted April 13, 2018 Don't you have to plug other end of intake system? terry Quote Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/#findComment-396545 Share on other sites More sharing options...
Ezrider Posted April 13, 2018 Author Share Posted April 13, 2018 nope if a intake valve is open the exhaust valve will be closed, engines that operate on boost wont have any valve overlap so every cyl will be sealed ether at the intake valve or the exhaust valves/rings, there will be some leak down but not enough to matter. Quote Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/#findComment-396546 Share on other sites More sharing options...
terry Posted April 14, 2018 Share Posted April 14, 2018 1 hour ago, Ezrider said: nope if a intake valve is open the exhaust valve will be closed, engines that operate on boost wont have any valve overlap so every cyl will be sealed ether at the intake valve or the exhaust valves/rings, there will be some leak down but not enough to matter. learn something new everyday!! terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/#findComment-396551 Share on other sites More sharing options...
theakerstwo Posted April 14, 2018 Share Posted April 14, 2018 I always turn the engine slow and watch the pressure gauge and when it comes up the highest then stop turning it. 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/#findComment-396552 Share on other sites More sharing options...
Ezrider Posted April 14, 2018 Author Share Posted April 14, 2018 13 hours ago, theakerstwo said: I always turn the engine slow and watch the pressure gauge and when it comes up the highest then stop turning it. iv never really noticed a difference based on what position the engine was in. if you had a cam that had valve overlap you could have a pretty big leak out the exhaust if the engine was in overlap on one cyl. typically you wont see valve overlap on a engine that is intended to run on boost though. i wasn't terribly concerned with actual leak down numbers when i filmed this. this was when i was trying to diagnose that chirping sound under boost. it did take a couple mins to bleed down once the air supply was turned off. still currently running that cac ill plan on replacing it probably before too long. it might be repairable too. the leak is where the cores go into the side tanks. could probably be soldered with some aluminum brazing rods. Quote Link to comment https://www.bigmacktrucks.com/topic/53087-checking-for-boost-leaks/#findComment-396591 Share on other sites More sharing options...
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