Thread: Exhaust fumes

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I am getting eye burning exhaust fumes inside my 54 GMC Panel truck. At a standstill I don't notice the fumes, upon moving it starts. Heavy accelleration is the worst. No holes in the firewall and have not found any in the floor, It has PCV, Headers, 2x2.5 into 3" tail out the back center about 2-3"past, no leaks found so far. The front of the truck is 5"with about 5" rake to the back. Is it possible because of the blunt back of the Truck , its doors, The rake That it is pulling the fumes back under or is not getting the fumes out away far enough

So one valve cover has a PCV. Is the other one just vented through a cover brether/filter? You can go to a 'closed' ventilation system by tying the valve cover oppposite the PCV back into the air cleaner and then the engine will keep the air cleaner under the hood ...........

Kitz

Originally Posted by 53 Willys

Is it possible because of the blunt back of the Truck , its doors, The rake That it is pulling the fumes back under or is not getting the fumes out away far enough

Yes. You can try to improve the sealing around the doors, and tune the carb better, but in the end, moving the exhaust tips out to the corners where the side stream air takes the exhaust away is a good thing to do.

First --Thank You
I have the breather to go to the air filter
The rear doors and windows ,short of welding them shut will never seal real tight . The fit and seal in 1954 for trucks was not much of a concern. I did duct tape them shut once just to see but it did not solve the problem. The Primaries are adjusted about as lean as I dare the secondaries can still come down some. This engine is a little picky as to outdoor temps and how lean /rich it wants to be. Temps around here now are up and down.
The plan is to cut the tail and reroute it out a corner about a foot and test , It will be ugly but if it works I can figure that out later.

Bob is right, station wagons had that reversion problem which is why most have the exhaust routed into the slip stream at the rear/side of the car. With the symptoms you are describing, that is what is not happening.

Don

There's a reason why guys used to run cab stacks on older trucks. Not an option in your case, though.
Down turns out back might help. Small tail pipes to keep the gas velocity up, too. I don't like side exit pipes much, but maybe better safe than sorry.
Leaning the engine might make the smell less noticeable, but the monoxide will still be there, maybe more dangerous if you can't smell it so much.

Today I cut the tailpipe off behind the axle, put on a 90 and ran it out under and past the fender behind the tire . it smells better and looks lousy , The rear door(s) does not seal real well at the bottom and to correct this It really should be replaced, Rear panel doors are far and few between and more $$ than I have right now.The 48 VJ thats in the garage needs to get finished and out first.