I need to get my jeep out of the garage and onto a trailer to get it to the exhaust shop for headers and the rest of the exhaust, can I run it with just the old exhaust manifolds on, or will something bad happen?

Run it, you'll be fine as long as nothing flammable is behind the manifolds.

get before and after pics, too.

before the fire, after the insurance company settles.

Is it a huge fire hazard if it is only for a few minutes? I need it to run only long enough to pull it out of the barn and up onto the trailer. Talking MAYBE 3 to 4 minutes.

Is it a huge fire hazard if it is only for a few minutes? I need it to run only long enough to pull it out of the barn and up onto the trailer. Talking MAYBE 3 to 4 minutes.

you should be fine as long as the open ports aint blasting on anything thats going to start fire. when built my v8 s10 i drove that thing around the blocks a few times with just manifolds. just dont run it any longer then you have to. start it up, try not to rev it more then you have to and get it on there and shut it off.

if you ran a engine with no manifolds then your asking for trouble. a friend of mine building a enduro car did that and almost burnt down his garage.

Plenty of people run open headers...open manifolds arn't any worse...think about it....just be smart about it

Open manifolds and headers are a little different.
A couple minute run won't hurt, I wouldn't run it any longer than possible so you don't risk burning your valves.

ok, so my dad was right, he wasn't sure but he thought he was told when he was younger that you could damage the valves some how.

So it sounds like the general concensus is that I can do it, but only for a little while and just at about idle speed would be the best.

We run irrigation motors on the farm for days on end with open headers.

A summer or two ago I had a pipe rot off right at the passanger side exhaust manifold on my 1975 C20 with 3,900 pounds of camper on the back (8,200 total weight.) I ran that thing all the way home through mountians and everything over 300 miles at highway speeds (when able.) No problems.

Growing up I always heard that thing about the valves too. I always understood it was something about shutting the hot engine off in the cold weather would warp the valve stems. I don't know if it is true or not but my engine seems fine. This happened to me in the summer for what it's worth.

Open manifolds and headers are a little different.


Why?

I have (any plenty of other people have done it) run an open manifold rig for more than a couple of min and never had a problem. I usualy do it while setting a rig up, and then drive it down to the exhaust shop. Never had a problem.

Running open manifolds creates a virtually zero back pressure enviroment for your valves.
Backpressure keeps the valves cooler running at lower temps. Which increases the life of the valve.
People who race with open headers usually run high performance titanium valves built to withstand short term super heated temps.
Running for a few minutes isn't going to hurt it.


OklahomaK5, whoever the dumbass is that thinks running irrigation pumps with open headers is cool is a moron.

I ran my s 10 blazer 4.3 (off-road) with just manifolds and a short pipe for a while nothing happened. Well I eventually spun a bearing but that was from over reving. We turn the manifolds upside down on derby cars and cut holes in the hood. No know problems but we wouldn't pay attention to it if there was a problem unless it seize's. So maybe you shouldn't listen to my advice

I ran open shorty headers for almost 2 years. Summer and winter both. Heard alot of people say I'd warp my valves, but didn't have any trouble with the truck. Only with our local law enforcement!

OklahomaK5, whoever the dumbass is that thinks running irrigation pumps with open headers is cool is a moron.


Hey Flipper, Glad you think farmers are morons, try eating dirt. I didn't think this had anything in it about being cool. Its what's out there. I haven't looked at a lot of irrigation engines I just know what I have seen in my area. This guy wanted to know if he could put his truck on a trailer without hurting it. And based off of the number of hours I have seen these irrigation motors running with stock valves at 3'000 RPM and open headers, he should be alright. The obvious caution is to not have flammable materials getting torched by the exhaust.

Hey Flipper, Glad you think farmers are morons, try eating dirt. I didn't think this had anything in it about being cool. Its what's out there. I haven't looked at a lot of irrigation engines I just know what I have seen in my area. This guy wanted to know if he could put his truck on a trailer without hurting it. And based off of the number of hours I have seen these irrigation motors running with stock valves at 3'000 RPM and open headers, he should be alright. The obvious caution is to not have flammable materials getting torched by the exhaust.

Never said farmers are morons, but obviously, installed exhaust systems weren't thought of by me, it was the automotive engineers who came up with the crazy idea.
Having grown up in farm country myself, I can say I have never seen that, on any irrigation pumps. But maybe its just people in your part of the world. Maybe the light doesn't come on as quick there as it does in other parts of the country.
And yes, screename is different, but that was my comment, and yes you are talking to the same guy. ;)

Never said farmers are morons, but obviously, installed exhaust systems weren't thought of by me, it was the automotive engineers who came up with the crazy idea.
Having grown up in farm country myself, I can say I have never seen that, on any irrigation pumps. But maybe its just people in your part of the world. Maybe the light doesn't come on as quick there as it does in other parts of the country.
And yes, screename is different, but that was my comment, and yes you are talking to the same guy. ;)

Way to standup and be a man! How many other screen names do you have? I have only one. Its all I need.

Not to hijack this thread, but funny thing, I had a posted a thread, with a link to another thread here on the board, and one mod in one of the forums who shall remain nameless decided for whatever reason to change my link. With no explanation. And then I changed it back to my original link, the Power Tripper Mod decided to change it again, and again no explanation, and banned my old screename.
What the problem was I have no idea. The link was a to a funny newb bash in Gen 4x4, so whatever.
I think its great that a 2.5 year redstar member can get banned from the forum with no explainable reason and no idea what he did wrong....so until the day I meet that mod face to face where he can't be a little bitch and hide behind his computer monitor, I will have to be this guy with this new screename.
Or until I get a response back from Lance asking him what the hell is wrong with one of his mods...
And no, its not a Chevy Mod, those guys are cool.

Nothin wrong with open header but a cracked manifold can burn valves pretty quick.

I used to work on old air cooled VW engines way back. Lots of them would come in with blown out mufflers with large holes in them or the funky exhaust gaskets at the exhaust ports and heater boxes blown out.

90% of the time after we fixed them with a new muffler and gaskets, they would come back with a dropped valve head a week or so later.

We would warn them before we even did the exhaust work.