I'm not so sure I believe that, the tail pipe on my 247 is very small, and it's been a week since I had it on a low bed (with the pipe in the wind) and no damage.
Ron - i have to agree, i don't think that any one cylinder ever has both inlet and exhaust valves open enough to allow any decent amount of air flow to turn the turbo fins and not to get them to spin fast enough to cause any damage. I think how much exhaust gas is required to get it to spool in the first place.
http://www.88total.com/techpagecamshafts.htm Is there enough air to spool up a turbo? I have no idea. But its 10 seconds of work to never find out. Bobcat ron asked about dust/debris in the fins. There wouldn't be any, cause the air passing the tail pipe creates a vacuum in the exhaust system
The turbo spooling up in transit is a myth I guess I have no proof other than the thousands of miles of trai.ler time my loader has
This debate has been done before, some say it does some say it doesn't. I try and stay out of it as much as possible
It's a myth, my brother has lowbedded excavators (with the pipe in the wind) since 1998, and not one has had turbo failure, and some of them have travelled over 4 hours, 1 320 Cat made that trip 4 times in 1 year.This debate has been done before, some say it does some say it doesn't. I try and stay out of it as much as possible
Like i said, i have never owned a turbo anything, so i don't know it all. I have a mate that had a turbo'd Volvo car (yeah Volvo driver!) he blew the seals from not knowing you had to let it cool before shutting down after giving it a flogging, which he did quite often. So i can stand by the fact you MUST let it cool down by letting it idle after being run for at least 5 minutes to cool down a bit. I know just how much exhaust gas is required to spool the turbo up, and I'm pretty sure you could never get that much air through valve over lap or even with the pressure of it moving along the highway doing say 100k'h.
I guess its peace of mind, if you blow a turbo you will be up for thousands to replace it plus possible engine damage from pieces of the compressor turbine as it flies apart and the engine snorts it up.
I'm sure I'm going to be yelled at for saying the above, but do your best/worst! I'm always up for learning new things.
It's a myth from my experience, Taking the time to cool the turbo is more important.Scott
Yes, cool down is very important.
This is good stuff, A real debate. I can prove its possible, but you can't argue with experience. Bobcat ron's brother probably has more transport miles logged than me (Its safe to say he does.) without any problem. So there you go, just like a real debate lots of talk, and no definate answer. The next cylinder head I take off, I'm going to measure the overlap cause now I'm just curious and I want to check how much air is needed to turn a turbo at a decent speed. I'll post my results, but I don't know when my next turbo diesel cyl. head job is, so it might be awhile.
I lost one on a 740 JD skidder, It ran fine going on the truck and 3 hours later smoked like crazy when we started it. Found bits of the turbine compressor back up in the air filter when we removed it. we float quite a bit, plug them all.
I don't think this one would ever have a definite YES or NO, no matter what there will be people that say it must be plugged, others will say no it will be fine and have no issues.
This sounds fun , so i'm going to stick a vacumm cleaner hose out the window and hit the highway.I need to find one of those pinwheel on a stick thingiies that you get at the carnival and use that to measure velocity. Very very scientific LOL
Ok, MORE on the turbo debate. I talked to a mechanic friend about all this and he just laughed. He told me he setup a turbo on a bench once with a air gun with 80 lb's of pressure. Used his hand to cover the exhaust so to direct the air into the turbo, with full pressure the turbine didn't even move. He agreed that the idling is the most important thing to do though.
