From what I've read it usually happens if the throttle sticks and the RPMs get out of control, then as the seals break down they start running on oil. Once it gets to that stage your only hope is to cut the air supply.
Or, there's an oil leak from somewhere and that introduces the fuel. Older diesels don't have a throttle body, they vary the fuel not the air intake. So they are free to suck in as much air as they
want. Sump oil + Air = Fast engine = Boom :v:
Again, this is just what I have read in the past hour.
[QUOTE=MightyMax;36567446]I seriously don't understand how runaways happen.[/QUOTE]
Two ways for it to happen:
1) Stuck fuel injector.
2) Since Diesels use compression to superheat/burn the fuel, the engine can run on the oil cooling it. If a Seal blows on the turbo (most common way), oil can start to feed into the intake of the engine. Any oil leak can cause it though.
Since theres no Throttle body the RPM is controlled by the fuel supply, So the engine "runs away" due to the unregulated supply of said "fuel". Unless its a stuck injector with an electric Fuel pump, The only way to stop it is to Suffocate its air supply.
[video=youtube;WrAeUf7v49g]http://www.youtube.com/watch?v=WrAeUf7v49g[/video]
jesus christ thats terrifying.
[editline]30th June 2012[/editline]
[QUOTE=FoxDonuT;36567508]Two ways for it to happen:
1) Stuck fuel injector.
2) Since Diesels use compression to superheat/burn the fuel, the engine can run on the oil cooling it. If a Seal blows on the turbo (most common way), oil can start to feed into the intake of the engine. Any oil leak can cause it though.
Since theres no Throttle body the RPM is controlled by the fuel supply, So the engine "runs away" due to the unregulated supply of said "fuel". Unless its a stuck injector with an electric Fuel pump, The only way to stop it is to Suffocate its air supply.[/QUOTE]
Thank you for explaining. Why don't diesels have throttle bodies?
Due to them being very high compression (anywhere from 16:1-22:1), and also being Direct injection. They run on a fixed amount of air coming in for each cycle and then varies how much and when the fuel is delivered into the cylinder.
I personally LOVE Cummins engines. The ISB in the dodge sounds awesome. Especially when they run a low idle tune.
[media][URL]http://www.youtube.com/watch?v=T_MDulz3W2g[/URL][/media]
[QUOTE=MightyMax;36567649][video=youtube;WrAeUf7v49g]http://www.youtube.com/watch?v=WrAeUf7v49g[/video]
jesus christ thats terrifying.
[editline]30th June 2012[/editline]
Thank you for explaining. Why don't diesels have throttle bodies?[/QUOTE]
The way it works is that you have an injector instead of spark plugs, when the spark plug would fire in a petrol driven car the injector shoots a mist of diesel in, which is then ignited by the very compressed gas (which is very hot, around 900c iirc).
If you would use a carb instead, the diesel would just pre-ignite.
ninjad D:
[QUOTE=MightyMax;36559230]Like a street rod? If so, then this is the only color scheme for it:
[img]http://www.fordmuscleforums.com/attachments/street-rod-forum/7427d1237800029-hot-rod-street-rod-jon_26343-1-.jpg[/img][/QUOTE]
Proper matte black like so, but no red accent, a creme color instead.
[video=youtube;D9J91Iq52Bk]http://www.youtube.com/watch?v=D9J91Iq52Bk&feature=related[/video]
This is infinitely more horrifying.
[editline]30th June 2012[/editline]
[video=youtube;d_8Fc9qAZcw]http://www.youtube.com/watch?v=d_8Fc9qAZcw&feature=related[/video]
runaway on a dyno.
[editline]30th June 2012[/editline]
dat thumbnail.
I love the stupid bystanders in this video.
[media]http://www.youtube.com/watch?v=hOQ66cZaPb4[/media]
I could watch these all day, it's new to me.
Personally I prefer it when the trucks are deliberately Smoking :v:
[media][URL]http://www.youtube.com/watch?v=Mz2Oh_DGo7M[/URL][/media]
[QUOTE=MightyMax;36567852]
[video=youtube;d_8Fc9qAZcw]http://www.youtube.com/watch?v=d_8Fc9qAZcw&feature=related[/video]
runaway on a dyno.
[/QUOTE]
Holy fuck
[editline]30th June 2012[/editline]
Speaking of diesel, when I was out as an intern (I think that's the word, you're with someone at their job, working with them as training) we rode around in a Scania 112H (since I was out with a trucker).
Whenever we had one of them eco-cars behind us, we would cover them in black smoke by using the exhaust brake and giving the truck full gas at the same time, when the exhaust brake opened up black smoke just poured out and covered everything behind us. Fun as hell.
[QUOTE=MightyMax;36567852][video=youtube;d_8Fc9qAZcw]http://www.youtube.com/watch?v=d_8Fc9qAZcw&feature=related[/video]
runaway on a dyno.
[editline]30th June 2012[/editline]
dat thumbnail.[/QUOTE]
That's not a runaway. That engine just exploded.
Caused from a runaway though, maybe?
I remember the fist time I was driving my schools volvo truck and accidentally hit the retarder and was like wtf is going on
who even puts the retarded "button" in the place where you rest your clutch foot
[b]retarder*[/b]
Well i'm never buying a diesel ever.
Diesels are the best, I love them.
So what i've gathered is, any engine without a throttle (diesels, jets, etc) can go on an uncontrollable rampage at any given moment, as long as it's worn out?
[QUOTE=MightyMax;36568468]So what i've gathered is, any engine without a throttle (diesels, jets, etc) can go on an uncontrollable rampage at any given moment, as long as it's worn out?[/QUOTE]
A throttle can jam fully open you know, sure it's easier to fix, (shutting off the ignition) but still.
It's hell when you're on a motocross or something though, happened to me and I had no way to shut off the ignition. Had to pull in the clutch, stop, put it into 5th and let up the cluth, all while the engine revs like shit.
[QUOTE=FoxDonuT;36567917]I love the stupid bystanders in this video.
[media]http://www.youtube.com/watch?v=hOQ66cZaPb4[/media][/QUOTE]
"I need to disconnect the battery!"
Haha okay you go do that and see what happens
[QUOTE=MightyMax;36568291]Well i'm never buying a diesel ever.[/QUOTE]
Most newer deisels to my understanding do have a butterfly choke valve that closes when the car/truck is turned off.
Eugh, that's freaky. Do runaways apply to our tuners Bradley?
I got a job at the local Autozone! I got a call today and he was offering me a position. Retail car store job ftw
[video=youtube;S1sGzIX_mqo]http://www.youtube.com/watch?v=S1sGzIX_mqo&feature=related[/video]
I finally found something that sounds better than a V-8: A V-12 tank engine.
[QUOTE=MightyMax;36568654][video=youtube;S1sGzIX_mqo]http://www.youtube.com/watch?v=S1sGzIX_mqo&feature=related[/video]
I finally found something that sounds better than a V-8: A V-12 tank engine.[/QUOTE]
now
lets put it in a miata
[QUOTE=sHiBaN;36568631]Eugh, that's freaky. Do runaways apply to our tuners Bradley?
I got a job at the local Autozone! I got a call today and he was offering me a position. Retail car store job ftw[/QUOTE]
Gas engines with electronic ignition can't perform a runaway.
Those without electronic ignition (pickup coil type on lawnmowers, for example) can go on a runaway if the throttle breaks and hangs wide open.
Regular gas engines like those in family cars/trucks/etcetera, with a distributor and switchable ignition requiring an external power source to run, cannot go on a runaway. Turning the ignition off would instantly kill the engine.
Although, some gas engines have been known to "diesel", I have been in an old chevy pickup that did this. It is scary when you don't realize what is happening, but is completely harmless. Even if a car was in gear, not moving, and shut off, and the engine began to "diesel", the power created from this strange effect is so little that it wouldn't move the car. It would stall the "dieseling" engine.
[url]http://www.mugen-power.com/automobile/concept/autosalon2007/gallery1/index.html[/url]
holy shit do want
[QUOTE=bradley;36560667]tap the end a bit, be careful. There is also a de-gapping tool you can use but it's unnecessary.
What's the gap now? Incorrect gap won't make much difference unless you're talking about sub-.30 gapping, since that's too close. Or any gap over .50 is pretty insane, too. I always gap at .40 just because it's a great distance to baseline any engine, you can't really go too wrong with it.[/QUOTE]
unless it's a turbo engine that need .028... .40 you'll get crazy spark blowing yaw
I think mine are gapped at 0.060 right now, will gap them at 0.055 once I get the AL104 with the S/C. Hopefully it'll be the good gap.
You make me miss my 02 Impala. Would so be Top swapped, and all the junk to get down to a 3.2 Pulley. Gave up a bullet proof Buick 6 for a 60* POS :(.
[IMG]http://i232.photobucket.com/albums/ee46/MaImpala/2002 Impala/Car5.jpg[/IMG]
[IMG]http://i232.photobucket.com/albums/ee46/MaImpala/2002 Impala/IMG_3106-1.jpg[/IMG]
Though I don't miss my ricer paint work :V:
[IMG]http://i232.photobucket.com/albums/ee46/MaImpala/2002 Impala/asd-1.jpg[/IMG]
Well you call this a ricer paint work, but honestly it looks nice, it gives a bit of life to your engine bay. It's not like you added go faster decals inside of it. W-Body pimpala's are nice I find. I'm a huge fan of the W-body platform.
Me and my friend are top swapping our GT soon enough, Will from overkillmotorsports says we should have our kits in hands in two weeks max from now. I'm probably going to be happy with a 3.5" pulley and 1.9 rockers.
I come from an Impala W-Body club, [URL="http://www.naioa.com"]www.naioa.com[/URL], where a few decent Pala's remain and even a few Grand Prix too. I hope to get a 3900 Tune from will when I can afford it, everyone's saying he did wonders for a shelf tune.
[QUOTE=ThermalArc;36570219]unless it's a turbo engine that need .028... .40 you'll get crazy spark blowing yaw[/QUOTE]
Well, that's getting into the performance territory, .40 won't hurt a stock, say, 7MGTE (.39 is the "max tolerance", .01 won't make too much difference). Personally I run .30, .28 is a bit too close for my taste. But it REALLY REALLY depends on how much boost is being forced in.
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