Unable to breathe

Does anybody else have a problem with the exhaust fumes completely filling the cabin upon decelleration? I have a door car and when I let off and slow down the fumes just fill the car and I can't see or breathe, have to jump out of the car like I'm on fire after getting it slowed down. The car is pretty well sealed off, not many places for anything to come inside.

Is this common place with blown alky cars? I'm going to redo my exhaust to route a different way instead of mufflers under the car. I know a lot of you guys are open bodied, and have zoomies.. but I figured I'd ask since there are a lot of blown alky guys in here.

 

I had enough the first day out in our nitro FC day and bought a whole freshair system from Simpson along with a FC bandit. Problem solved! Nog fumes, no fog inside helmet, cool fresh air all the time!

have a nice day!

Erik

 

I know of a couple of people who switched their bracket door slammers over to alky, and had to get the exhaust to come out the side of the car instead of underneath because of fumes, it's not that uncommon (even some that run on race gas have the same problem).

 

Exhaust Fumes

I built a set of zoomie style headers for my door car and when I'm shutting down I just put my clutch pedal in and pull the fuel shut off so the engine isn't even running for most of the shut down. Never really had any problems.

Corey

 

zoomies are run the headers through the fenders

 

Are you bypassing fuel (from your pump saver) to your hat nozzles when you shut the throttle? Although this is good for the blower it can be bad for the driver

Richard Gavle

 

Thanks for the responses, glad to know it's not just me that has this problem... The fuel is going back to the tank on the saver... I just have to re-do my exhaust to exit off to the sides. Wish I could afford new headers, I'd have some new fender exit ones made... oh well. It was kinda cool how the cabin would fill up with dust kind of like the in car video of the funny cars on TV

 

what kind motor if its a bbc this guy may have a set for sale that might work steve keen 270 869 8853

 

I have a chevy II that I bracket race sometimes. When I put my spare injected BBC in it the fumes were awful. I went to a diesel shop and bought a 4.5in. 90 deg exhaust fitting, cut it in half and welded each piece to my existing collector headers, creating 45 deg turnouts. No more problems with fumes, now the car in the other lane gets to enjoy the smell. Cost less than 50 bucks, at the end of the year I had the headers recoated and they looked factory made.

 

The motor is a SBC in a Stock Framed Chevelle so off the shelf headers probably won't work.

So if I kill the motor after I hit the traps how should I do that, cuz I think I hit the mag once and the motor popped. One other time I killed the fuel and of course it buzzed up lean.

What do you guys do after you hit the traps, When I hear the big boys go it sounds as if they kill the fuel after the stripe and you hear the motor buzz a little then die. What is the correct way to kill the motor without hurting anything.

 

you would be better off to fix the header problem just run turn out collectors and tuffin up

be careful killing a automatic car some wont free wheel as soon as you kill it are cut the power im not sure what it is auto an auto matic i remember a few years ago a freind built a brand new car bbc power glide made a pass reached up and killed the motor as he went threw the traps (powerglide with trans brake )as soon as he hit the switch it locked the back tires up and crashed it

 

Oh I instantly put the car in neutral the second I hit the traps... then move on to braking/chutes if needed.

 

Can't Breathe

I didn't notice you were running an automatic. I suggested pulling the fuel shut off, but as stated, I don't know what that would do, it may cause a highspeed lock up. We run a Clutch and Lenco so the whole drivetrain free wheels via the sprags in the tranny.

Work on the header problem.

Corey

 

I pull the chute,shut the fuel off and as she leans out a little I bump the mag kill. then i pull the trans back into low gear to free wheel, now this is with a bruno /lenco also not a powerglide or 400.

 

^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
Just like H BROWN said pull the chute first always drive into the chute!

I ran a stack injected,alcohol smallblock chevy powered gremlin years ago and the fumes just about killed me the first time I took it out .
I got some 3 1/2" 45* pipes from NAPA and attached the to the headers and pointed them out the side of the car, this got the fumes out from under the car and the problem was gone.

 

I don't want to sound stupid but please explain how a Powerglide transmission would lock up the back tires after killing the engine?

 

i dont know i just know what he said and seen what happened they might not do that today this was back in the late 80s i never understood it either it was fast car for the time 5.70s in the 1/8 mile pretty fast for a bracket car in the 80s

 

When you shift most conventional automatics into neutral at the end of a run the planetaries can rotate at a speed that is the inverse of the first gear ratio. That is to say that if you are running 10 grand and shift into neutral on a 1.82 first glide the planetaries may spin at 18200 rpm with the possibility of explosive failure (I used the 10 grand to simplify the math). This is even more of a problem on 400s C6s and Torqueflites due to the lower first gear and the greater mass of the planetaries. The other problem that you have is when you shift into neutral temperature and pressure soar inside the trans creating a multitude of problems.

Take it to the bank it can be very dangerous to shift into neutral at high speed particularly on 3 speed autos.

Some trans guys say that it is O-K to shut the motor down at the end of the run, the logic being that at that point the pump is no longer in operation so no damage can result. I disagree with this, I feel that this causes excess temps and wear due to the lack of fluid and the localized hot spots, this last paragraph is my opinion and I do not make a living building transmissions but I prefer to allow the car to slow before shutting down.

Richard Gavle

 

Shifting to neutral WHY !! ?

I agree with bottlefed. I run a powerglide with a 14:71 in a door car.Zoomies required for breathing,but they really mess with the head of the other car on the starting line if they are not used to the noise. LOL
I really drive my car like a street car,pull the chute idle through the turn cut the fuel and like Howard said when it idles higher cut the power.No problem in years doing this.This seams to work for me and start up is easy doing it this way even in warm ups.

Chuck