Exhaust Jacks - Part 2
Submitted: Monday, Dec 05, 2005 at 15:49
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Mal P
Thanks to all who gave their thoughts on exhaust jacks. I have a 3.0L Hilux with turbo diesel and the response from Gerry about back pressure got me thinking. I rang Bushranger who supply the neat X jack and they told me to stear clear if you have a turbo.
The X jack can be used with an air compressor however lifting 750mm in two minutes with a 75L/min compessor. Problem solved if you want the features of the exhaust jack and you have a compressor.
Mal P
Reply By: cruiser - Monday, Dec 05, 2005 at 17:46
Monday, Dec 05, 2005 at 17:46
What is the drama if you have a turbo ?
Most turbo's dont kick in until around 1800/200 RPM as I understand it, and surely you dont have to run the engine at these sorts of revs when using an exaust jack.
I know that when I have used
mine, I have just let the engine idle and have had no problems lifting an 80 series cruiser.
AnswerID:
142486
Reply By: Kiwi Kia - Monday, Dec 05, 2005 at 21:41
Monday, Dec 05, 2005 at 21:41
I do not know of any reason for doing damage to a turbo. But, if the theory is correct then don't drive into
water as the back pressure caused by the the exhaust being under
water will damage the turbo....hmmm, I don't think so.
AnswerID:
142523
Follow Up By: Mal P - Tuesday, Dec 06, 2005 at 09:37
Tuesday, Dec 06, 2005 at 09:37
Back presssure on and exhaust under 30 inches of
water would only be a couple of PSI. Exhaust jack PSI to lift a couple of tonne would be more than that.
If the supplier of the jack tells me not to use one with a turbo, I will believe him. Just as easy to plug the compressor in.
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396091
Reply By: Kiwi Kia - Tuesday, Dec 06, 2005 at 17:07
Tuesday, Dec 06, 2005 at 17:07
Can you actually quote me a reputable source and reason for the theory that you should not inflate a bull bag if your vehicle has a turbo?
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142642
Follow Up By: Mal P - Tuesday, Dec 06, 2005 at 17:41
Tuesday, Dec 06, 2005 at 17:41
I spoke to Bushranger on 1800 654 767. Ask to speak to someone about the X-jack.
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Reply By: Wayne (NSW) - Tuesday, Dec 06, 2005 at 17:49
Tuesday, Dec 06, 2005 at 17:49
Mal,
We have use the exhaust jack at least once a month for the past 10 years that I know of on the
driver training courses that we run. In that time we have used many vehicles and quite often a diesel and now days the diesel is a turbo. We have not had any problems with lifting the vehicle or the turbo. On a diesel the motor just has to idle to pump up the bag and I would think that if it was a problem for the turbo and motor it would stall.
I was at the Penrith 4wd show and the rep from Bushranger was there to show off the new exhaust jack. He used the company vehicle to demonstrate the exhaust jack which was a Turbo Diesel Rodeo.
Wayne
AnswerID:
142645
Follow Up By: Kiwi Kia - Tuesday, Dec 06, 2005 at 20:14
Tuesday, Dec 06, 2005 at 20:14
I also use a turbo diesel to inflate airbag jacks on
driver training and have no problems. Also, I have not seen any caution notices on any air jack packageing. I think it is a load of cobblers! I know the internal workings of engines rather
well and can not see any reason back pressure to cause any problems. Having backed exhaust pipes into mud banks, doubled them up almost closeing the pipe, had them under
water if there was going to be a problem I would have seen it by now. But, getting back to the main issue, a diesel exhaust is a powerful tool and back pressure is used as an engine brake in many turboed engines. QED
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Reply By: Member - Phil G (SA) - Tuesday, Dec 06, 2005 at 21:51
Tuesday, Dec 06, 2005 at 21:51
Theres a warning in the SA DTU training manual to the effect that back pressure can damage the turbo, so its best to use a normally aspirated vehicle to inflate exhaust jacks. I don't know whether this is theoretical or real. I made up a Schrader fitting to use with the exhaust jack I used to have - goes up nice and slow too.
AnswerID:
142676