Running without any exhaust?
 

I have this really crappy 120k-ish used engine that I'm going to use to temporarily resurrect my engineless car. It's been sitting for a while and I put a little ATF in it a while back so I expect it to smoke like a bitch when I start it up, assuming it even starts. I don't want to ruin my cats any more than they already are (I tried this trick with my old, dead engine), so I was thinking I might just let it blow all it's shit out with just the manifold on there and nothing else. Anyone ever ran an engine with no exhaust on it whatsoever? What should I expect? Will zero back pressure screw it up? Will flames shoot out and ignite my car?

Thought I might get some metal ducting or something to at least pipe the shit away from my car...

BTW it's an 88 na

LOUD that is what you should expect. It won't hurt the engine but it will probably idle at around 2k rpms.

first off, dont run the engine without an exhaust bolted up... a non turbo rotary is by far the loudest thing on the planet... (yes i've driven 40 miles without mufflers just open manifold) dude, it was rediculous, the whole car shakes from sound vibrations, cops/people will be able to hear you from at LEAST a mile away.. just get an exhaust on there...

I could understand if you had open HEADERS with just a race pipe running to the side of the car. that's even LOUDER...

-Markus

"You'll go deaf"

Hmm, well, if it was only for 15 minutes or so, I am hoping to be kind of out in the woods when I do it... :) And I'll definitely wear ear protection...

Yeah went we changed my exhaust i tried running Open header and it was damn loud. Deff. wear something to protect ur ears.

Hmmm, now what to connect the ducting the the manifold... an assload of aluminum foil?

So you mean no exhaust from where back??? If you have absolutely no manifold you're going to fill your engine bay with flames, so make sure you have at least headers on it. And like everyone has said an na will be the loudest thing you've ever heard.

do you have any mechanic freinds, see if their shop will lend you a rubber shop exhaust hose. The ones the hook up to the tail pipes and than stick out the door. That will make it a little better and you also won't die from poisonous gasses when working under the hood


It is LOUD!!!!

I mean no exhaust from the manifold back.. so at least whatever comes out is consolidated into a single hole..

I'm afraid I don't have any mechanic friends. It really sucks, I have to learn all this shit the hard way because of it. I have friends who have worked on cars but somehow they still don't know anything or are afraid to try stuff... so here I am.

You will be fine as long as you have a manifold, but as mentioned, it will be loud. I'm not sure you can fully appreciate exactly how loud until you have experienced it. Use earplugs.

use earplugs, and anything else that can cover your ears, and dont turn the car on over any little gas spills, can you say, EXPLOSION

while doing my clutch i turned my car on with only my manifold... WOW... loud... i wasnt expecting it to rev up... damn cold start.. ;) .... yea use earplugs.. when i get my clutch n tranny in i will drive it once around the block

LOL, drive around the block at 3 am

yeah i started my car once with only a downpipe on and it was like OMGO JSADKLJSDkljhskgjkvn

How loud would a T2 be with only a downpipe? im waiting on my exhaust, and it might be a while.

STILL loud. The turbo quiets it a little, but you will hear it.

I agree I did it for 18 miles. . I got cut off by this stupid Eclipse so I punched it to pass him and it was so loud it scared the shit out of him and he almost crashed, not to mention it backfired and shit a flame underneath my car.. be carefull....

Man you guys are all soft!! :)
It's not that bloody loud, don't worry about ear protection!

and someone said earlier it will idle at about 2k?
no, it should idle exactly the same as it did before you took the exhaust off.

Manifold and the exhaust sleeve keep it quiet compared to old motors. You won't hurt the motor nor your ears if you just lug it around. I started a bridgeport once with open headers and exhaust ports roughly the size of 2 in. X 1 1/4in. WOW that was loud even in my book, but you stock S4 motor with manifold is ok.

I met a guy that runs like this. You and all the people around will hear you, but I guess it can be tolerated. You'll be shooting flames onto the bottom of your car. I'd recommend keeping your exhaust on, if you have it.

um ...
it should be faster tho ... right ?

I started up my T2 with just a downpipe once, it was so loud I wouldn't rev it over 3k. My .02

Dan

OK here's another question... since I'm doing this partly because I don't know whether this engine will even run or not, could I also start it without bothering with the clutch, flywheel or tranny? Like obviously it will run but will running it with no flywheel or anything else cause it to idle at high RPMs? I'm assuming it would but what do I know.. So maybe I can not only do this loud, but REALLY gdf'in loud.. that'll be good

IMHO you'd be silly not to worry about the flywheel...
but dont worry about the clutch and all that crap...