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Exhaust Jacks - Part 2

Submitted: Monday, Dec 05, 2005 at 14:49

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
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AnswerID: 142486   Submitted: Monday, Dec 05, 2005 at 16:46

cruiser replied:

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.
Reply 1 of 5
AnswerID: 142523   Submitted: Monday, Dec 05, 2005 at 20:41

Kiwi Kia replied:

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.
Reply 2 of 5
FollowupID: 396091   Submitted: Tuesday, Dec 06, 2005 at 08:37

Mal P posted:

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.
FollowUp 1 of 1
AnswerID: 142642   Submitted: Tuesday, Dec 06, 2005 at 16:07

Kiwi Kia replied:

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?
Reply 3 of 5
FollowupID: 396171   Submitted: Tuesday, Dec 06, 2005 at 16:41

Mal P posted:

I spoke to Bushranger on 1800 654 767. Ask to speak to someone about the X-jack.
FollowUp 1 of 1
AnswerID: 142645   Submitted: Tuesday, Dec 06, 2005 at 16:49

Wayne (NSW) replied:

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
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FollowupID: 396180   Submitted: Tuesday, Dec 06, 2005 at 19:14

Kiwi Kia posted:

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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AnswerID: 142676   Submitted: Tuesday, Dec 06, 2005 at 20:51

Member - Phil G (SA) replied:

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.
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