Exhaust in cabin

[jpipes]

Is it fairly normal to have a somewhat persistent and relatively noticeable exhaust smell in the cabin of a 710m when all the sides are down and at idle or driving along? I've noticed on my Pinz that I can smell exhaust fairly often and relatively strong, enough to think to myself "hmm, smells a lot like exhaust, I wish I was smelling fresh air right now" from time to time. Those I've hauled in the rear said the same thing depending on if the sides were up or down.

Seeing as though it's a soft top and the exhaust is smack at the side of the truck, I assume exhause smells in the cabin are normal. Are they? If so, how much is normal? Any suggestions on what to look for to check? I am thinking check for heavy wear to the muffler, insure the pipes are connected tight to the engine, no leaks in the system, etc. Assuming not, would rerouting it be the only solution?

Thanks in advance!

[skybarney]

Mine used to smell like exhaust. I put on a flexi coupler at the header/heater box and it went away. Do you still have the stock setup?

[lindenengineering]

That is the smell of yesteryear!

Those of us over 40 should remember (I think) the stink of cars before 1970. The Clean Air Acts gradually changed all that. Over the past 30 years we have become accustomed to cleaner exhaust emissions from computer controlled engines. The same goes for diesels. No more acrid clouds of eye stinging smoke to contend with.
So when you get a whiff of a 1970's exhaust, its not too pleasant.

The Pinz is old, yes, yesteryear engine technology if you want to call it that. The beauty of the vehicle is its ease of maintenance without having to have expensive specialist equipment to repair it.

So to smell less exhaust gases simply clean up the emissions as best you can ensure the engine settings and carburation are correctly calibrated.

A few enterprising souls in the RMP I notice, have got some elevated relief by installing a through exhaust system terminating out at the upper rear corner of the truck and then having a small turned down curl on the tailpipe.
That appars to work fairly well.
Dennis

[2012]

dennis - i'd really like to see whatever i need to, to be able to do that to my exhaust. up and out the rear? are there pix anywhere?

[IwanaPinz]

My recent expensive experience with the exhaust system has taught me to stay stock. Nothing works better than the way it was originaly designed and it was easier too.
My inexperience lead to a costly mistake. I figured, after reading several posts, the local muffler shop could produce a muffler system that was eqaul to the original equipment.
What I got was a nice piece of welding but the result was very loud and backfired throught the downshifts. (I know, back pressure)
So not happy with the results I ordered a replacement from SAV and all by myself, installed it. I also replaced the heat shield.

Oh yeah, I don't smell exhaust.

I am very happy now and a little smarter.

[skybarney]

I am crazy happy with my aftermarket exhaust system. Very quiet, very long pipe under tool boxes with an additional silencer. It comes out the stock location as well.

[2012]

oh man, i need to know this stuff - what to do.

[jpipes]

Thanks for all the replies! I first will check the header/heater box and see if they need flexi couplers.

[pinzinator]

I think by accidental design, the Pinzgauer creates a cab vacuum by forward motion, which sucks exhaust into the rear and cabin. I don't think there is a real fix, unless the vacuum can be eliminated or a draft is produced creating positve pressure in the vehicle. What comes to mind are the deflectors installed on 60s GM station wagons that deflected air onto the back window to keep it clean. If something like this was installed on the forward roll bar if would force exhaust air out of the cab, as long as an opening was provided in the canvas. I could be full of it, but a wind tunnel test might clear things up.

[skybarney]

I am am aerodynamics kinda guy. There is not enough airflow close to the rear top of the truck for such a thing to be effective.

[2012]

so maybe the front body vents sold by sav are in order (the ones i see on the 716's and 718's).

[Twin Pinzies]

I agree with pinzinator. But I think that pinzies are prone to suck the exhaust back into the cabin and there is nothing that you can do about it-especially if the sides are rolled down and the back is rolled up.
All you can do is check the exhaust system for leaks and never drive with only the far back flap open.

[Tony]

I, as well as hitchhiking passengers, used to have the same problem with those eye stinging, sinus popping exhaust fumes. As a matter of fact I have even had a few passengers jump out of my 50mph moving Pinz during hail storms in the dead of night.

I finally decided to conduct a through analysis of this vexing exhaust gas question.

I found that the noxious gas emissions were directly related to the number of pickled eggs and bottles of beer that I had consumed during the last three hours. High ambient cabin temperatures and humidity were also a contributing factor.

The use of flex piping is effective, however it is not particularly comfortable especially during hot weather while driving over rough terrain for long periods.

It also can give rise to unfavorable comments at gas stations when one is either un-hooking, or, hooking up.

I hope this helps.

Tony

[mjnims]

I built a prototype spoiler for my pinz. The spoiler was connected to the points where the rear canvas is secured at the top. I had to make two of them before I got it right but it does work. I was actually able to drive down the road at 80kms and have the canvas flap on the sides. I did not make a final version as I installed the Yakima roof rack which has a plexi front and help out a bunch. The first thing that needs to be done is to fix the exhaust leaks. The flex couplings seem to be the best answer at this time.
Some other ideas that have come from this are to install the side deflectors to break up the air in the back of the pinz. I had a problem with these as there is no good place to mount them and they would surely be torn off in the thick brush.

[Anthony]

[quote="pinzinator"]I think by accidental design, the Pinzgauer creates a cab vacuum by forward motion, which sucks exhaust into the rear and cabin. I don't think there is a real fix,

First prize

In the early years of ownership of my LR101FC it was a GS with a Rag top that was before I converted it to a Radio Body, I was most disappointed that when the rear canvas door was open when travelling fumes were evident at the front noticeable by the driver. When driving with the rear open on dusty tracks all the contents of the load bed used to get covered in dust.

101's are equipped fume curtains behind the driver to separate the driving cab from the cargo area and this does help prevent fumes from poisoning the front seat occupants, you could then put your mother in law in the rear .


At certain speeds fumes did not appear noticeable in the cockpit and I can only assume that this was due to eddy currents produced by vehicle harmonics at that particular velocity. I can not remember what the effect of opening the drivers window whether it made it worse or better.

Anthony
Wales
GB