Temporary Exhaust Setup

[66Sprinter]

Hey....

I am purchasing a set of dual long tube headers (coated) from Mike for my coupe. I also have a stock 1 pipe exhaust. My engine is completely stock. I had an exhaust leak that is 1/2 gasket and 1/2 exhaust manifold. So I chose to go with headers. I dont have money left for completing the dual out setup (I am using my wiring money here) so heres my Q?

(1) Pull out the stock and run just the headers open
(2) Pull out stock and run headers with glass packs
(3) Go two into one and keep the stock exhaust setup

I am worried about running so much exhaust into the older system and same worries about running wide open headers... I have to keep this temporary setup for about 6months until I get more O/T.

Appreciate any and all comments or new suggestions.

 

[rommaster2]

If you're replacing the stock system i don't really understand why you're worried about running exhaust through it?

 

[pedal2themetal45]

I am worried about running so much exhaust into the older system .

Your running the same amount of exhaust that the old system had been running your just getting it their in a different manner. Now if you had changed it to a 250 I-6 or V8 then you would be running more exhaust into the system..
tim

 

[66Sprinter]

Headers provide more exhaust flow than a stock manifold. How much I am not sure...but definately more...alot more. (Like a new intake allows you to breathe in more easily...and set of headers allows you to exhale more easily)

So if I have a stock system with a stock muffler...will the increased exhaust flow create too much back pressure? (assuming the stock muffler is not blown out..which it is not) Now I am back to the original question and options.

 

[HighVolkage]

Headers provide more exhaust flow than a stock manifold. How much I am not sure...but definately more...alot more. (Like a new intake allows you to breathe in more easily...and set of headers allows you to exhale more easily)

So if I have a stock system with a stock muffler...will the increased exhaust flow create too much back pressure? (assuming the stock muffler is not blown out..which it is not) Now I am back to the original question and options.

headers will allow you to flow more air but theyre not going to magically make you motor exhale more air. but either way, i'm sure your stock exhaust is more than capable of handling what your motor will dish out

 

[Anonymous]

whats the collector outlet size on the headers? whts the exhaust size? most stock exhaust is 1-3/4 or so isnt it? and collectors are 2-1/2? new headers and stock exhaust wont flow well as if you had 2in or bigger pipe but wont hurt, and you said its only for 6 months or so.Saving money by putting a header on, adding a y-pipe to button and it up to stock single exhaust seems the cheapest route now, and save up later for duals.

Good luck

 

[66Sprinter]

Collectors are 2" and stock is 1 3/4" so there is not too much of a downsize. I probably will just get a Y and clamp it up short term.

Uhhh..as for the flow...the exhaust valves only allow a fixed amount of exhaust. The stock manifold traps this (site of first backpressure) and forces all cylinder exhaust into the single pipe and then the muffler (last point of backpressure.) Headers do nothing to increase the exhaust volume...but since the backpressure from the manifold is missing...the only restriction left is the muffler. This change..if too drastic or if not at all...affects performance. That was my point...

Maybe I am too picky since its 2" to 1 3/4" but the theory is correct.

 

[Lazy JW]

....
Maybe I am too picky since its 2" to 1 3/4" but the theory is correct.

The headers certainly will have more CAPACITY but unless you send more airflow INTO the engine the exhaust won't really have any more to send out.

My F-350 can haul a lot of hay on the flatbed, but if I'm only going to haul a few bales my F-150 will do just fine even though it doesn't have as much capacity.

If you are running the same carb, cam, etc. then there will be no worries whatsoever about the exhaust.
Joe

 

[Abandoned67]

Im pretty sure open headers are eligal in all U.S. states

 

[mustube]

Im pretty sure open headers are eligal in all U.S. states

It's' only illegal if you get caught, and what is illegal besides a sick bird anyways?

 

[shmoozo]

Several viable options:

Option 1 -- Get a used exhaust manifold from a junkyard, EBay or somebody here and a new gasket to fix the leak until you can afford the parts to build the complete exhaust system.

Option 2 -- Install the headers and use a Y-pipe and reducer to connect it to the stock exhaust for now. Swap to a dual pipe system with performance mufflers when you can afford it

Option 3 -- If the final system will use the "glass pack" mufflers then go ahead and install the headers, connect up a pair of "glass pack" mufflers behind them, and use a pair of exhaust pipe elbows to dump the exhaust just barely in front of the rear tire(s). As soon as you can afford to, however, run the pipes the rest of the way to the rear of the car.

Safety note -- For reasons related to carbon monoxide poisoning (which is not to be taken lightly) you really want to get the exhaust tips out from under the car and behind (or at the very least least well away from) any openings into the passenger compartment, especially on an older car like this which no doubt spews carbon monoxide like a coal-fired furnace. That would mean that you'd really want to get it to somewhere behind the rear tires if possible, but on a coupe you could probably get by with dumping the pipes just in front of the tire(s) for a few months. You might want to check your state and local laws to make sure you won't get ticketed for this if you get pulled over. To put it another way ...

Just dumping the exhaust under the car's passenger compartment is not safe and probably not even legal in most areas.

Option 4 -- If the final system will use the "glass pack" mufflers then go ahead and install the headers, use a Y-pipe to connect up a single "glass pack" muffler behind them, and then tie the system into the rear portion of the stock exhaust to get it to the rear of the vehicle. You can get another muffler and finish off the rest of the final system later when you can afford it.

For the record, I'd probably go with option 2 for now.

 

[ludwig]

Note -- For safety reasons related to carbon monoxide poisoning (which is not to be taken lightly) you really want to get the exhaust tips out from under the car and behind (or at the very least least well away from) any openings into the passenger compartment, especially on an older car like this which no doubt spews carbon monoxide like a coal-fired furnace. That would mean that you'd really want to get it to somewhere behind the rear tires if possible,

This cannot be stressed enough. My stock exhaust tailpipe split the front edge of the rear valence. I had a noticeable exhaust smell in the passenger compartment. I installed an 8" turndown tip to get it out past the valence and the problem is completely solved.

CO2 can kill you. At the very least, it makes you sleepy and impairs your judgement without you even noticing it. Behind the car is an air eddy that pulls the exhaust along with you rather than leaving it behind. You must get the gas beyond the slipstream, however you do it.

 

[Bort62]

It's actually CO, not CO2. Hence the "Monoxide" instead of "Dioxide"

 

[Anonymous]

And you won't necessarily smell anything.

That said, my temporary exhaust spills out under the passenger floorboard. I keep the car moving and the windows open (Hooray for summer!). I'm going to fix it SOON.

 

[ludwig]

It's actually CO, not CO2. Hence the "Monoxide" instead of "Dioxide"

At the very least, it makes you sleepy and impairs your judgement without you even noticing it.

See?

 

[AZstang66]

Wouldn't recommend open headers. They are LOUD and will cause hard starting and poor performance.

 

[66Sprinter]

Aha!

No we see that the change in backpressure does affect performance. My original quest was to see what TEMPORARY option I could use.

Open headers would work for a month or so..but not long term.
Hooking up to the stock exhaust will be the best effort short term.
I do have plans....but not money...to complete the dual out exhaust..

Damn...should brought beer for this

 

[Abandoned67]

My suggestion for temporary exhaust is keep the original! That is what my temporary exhaust system is haha

 

[mysavioreigns]

I like that answer abandoned, that's what I have too