| Author | Topic |
|---|
Location:
adel
Registered:
September 2002
|
|
..::BacKFire::..
|
Tue, 22 October 2002 00:31
|
 |
ok guys. i have a ae92 4a-fc engine..with fitted a k&N airfilter and a sports exhaust system.
just as a question.. my car sometimes backfires when i go really fast in changin gears..(this only happens when i go really fast and push each gear to the max, well nearly, i don;t realy know coz i have no tacho but can feel it)
is this backfire a good thing or a bad thing.??..guys plz give me heaps of response.plz..lol
coz 1 of my freinds says its good..but some say its shit.
so now i have no idea...
thankU all in advance
l8ers all
JIM
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 02:05
|
|
adds a touch of class to any car 
One day I might get my old ke55 up to previous standards and drive around splitting some mufflers. Adds great amusement to any drive down the freeway, specially if you drive beside someone, *bang!*, and point at their tyre...
|
|
|
I supported Toymods
Location:
Sutho/Hills NSW
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 02:15
|
|
Mine used to do it in the mornings when it was cold, even just changing gears at low rpm. Just gave it a service it managed to reduce it or just let it warm up a bit 
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 04:37
|
|
yeh even when it is warm up it sometimes still backfires at high rpm...still havnlt yet answer it yet...good or bad?.
hahhah lol..dude point at their tyres?...
lol
l8ers jim
|
|
|
Location:
Terrigal
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 04:46
|
|
I've heard that a leak in the exhaust will cause a backfire. Maybe there is a flange or weld somewhere that is leaking a bit?
Otherwise maybe just a bit rich/some unburnt fuel in the exhaust.
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 05:41
|
|
haha realli so it mite b bit rich/some unburnt fuel in the exhaust?
so is it shit?
lataz all
jim
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 06:08
|
|
The fact is that most cars with carbies do this, but with OEM exhaust systems you tend not to notice it. As soon as you put a free-flowing exhaust system on, the mini-explosion has a nice clear path to the world outside. BANG!
If it's really bad your engine probably needs a bit of a tune-up. Check the ignition timing, check the fuel mixtures, make sure there are no air leaks in the inlet system, check your plug gaps and the overall condition of the ignition system... the usual stuff.
BTW what you described isn't actually a backfire. A backfire is when the fuel/air mixture ignites on the inlet side of the engine.
|
|
|
I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 06:14
|
|
pft
my idea of a backfire is the foot long flame luke has coming out of thunderbird1
|
|
|
Location:
Adelaide
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 06:42
|
|
|
backfire from the exhaust is most likely from running too lean not too rich like some people think
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 07:23
|
|
oh........so i;m still confuse...i dunno if its a flame out or not.coz i dun stick my 30cmhead at the back of the car while driving fast n high RPM..lol
so neways
this only happens when its in a highRPM thou...so what is this called if it isn;t called a backfire?...
still if it good or not?..lol
l8ers again..
JIM
|
|
|
Location:
Wollongong
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 09:56
|
|
Are you hitting the rev limiter ?
My old car used to sound like it was backfiring, but it was bouncing off the rev limit.
|
|
|
I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 10:00
|
|
if its only at high rpm don't worry about it or just don't rev it that hard, i say its only happening because at that high rpm you will probably find the engine is missing a little and then you have unburnt fuel mixture in the exhaust causing the bang. go listen to almost any car which is being reved to the shit house and you will find it will pop out the exhaust,
your car is tuned for normal driving not running on the red line so you should expect it to make a little bang at high rpm, only time to worry is if its such a loud bang you shit yourself, then you know you have major problems.
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 14:19
|
|
my backfires sometimes..sou pretty nice thou..lol
erm | Quote: |
only time to worry is if its such a loud bang you shit yourself, then you know you have major problems
|
yep no shit
the hood goes flyin off..lol
so this a good thing then?/
|
|
|
I supported Toymods
Location:
Perth
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 23:01
|
|
|
Sorry to hijack the thread, but my XX has what looks like a 2" exhaust with a nicer muffler, and when I rev it up and back off the throttle it crackles sometimes, is this normal? Its got a 1GEU.
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 22 October 2002 23:32
|
|
After my car has let out a few good back fires it drives so much better, like it's clearing the system. I've got burn marks under my bonnet though from the carby when it backfires.
Nothing is as impressive the time that I was driving my car home and my b/f was following in his VL, I almost melted his bumper cause I had 4 foot long flames come out of the exhaust!!!!  
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 00:30
|
|
|
Yeah, I generally pride myself on lighting up the road behind me at night Needless to say, most people in my area know me very well...
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 01:28
|
|
I almost made a guy fall off his bike, I was going past him, giving him plenty of room and my car backfired and he went wobbling all over the road.
I think my record was about 15 or 16 going out my driveway and down the road!
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 03:00
|
|
|
I remember this old german looking dude (probably about 75+) in a nearly as old VW going down the south gippsland highway at about 40km/h, with huge clouds of smoke pouring out. Let it rip right beside him, watched him swerve all over the road. Poor bugger!
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 03:19
|
|
Most of the time when mine back fires it's actually in the carby. I've got all these black marks on the underside of my bonnet above the carby. When my dad and b/f were trying to get my car to run last night I told my b/f to stand back cause it has a habit of doing that. Well he ended up deaf in one ear as he was leaning near the carby. Don't think he went near it again.
I love my car, so much personality.
Oh and if it's not backfiring then it's the horn that goes off randomly!
|
|
|
Registered:
June 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 03:44
|
|
'89 Ford Telstars & Mazda 626's do the best backfires,
Cruise along in 3rd at 50km\h (no tacho), turn the key off give the pedal a few good pumps and turn it back on, Then you'll hear a backfire, Puts anti-lag to shame!! Good old work cars aye!!
FYI, make sure the road is straight when you turn the key off, the steering lock could cause you some greif!!
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:21
|
|
hahahah u blokes all make me laugh about the back fire....yeh i guess backfireing is good then hah?
lol
| Quote: |
Sorry to hijack the thread
|
yeh no probz dude its all good nefing bout the back fire
__________________________________________________ ______
| Quote: |
After my car has let out a few good back fires it drives so much better, like it's clearing the system
|
i agree..mwhhwuhahwuah
ok l8ers all~!~!
JIM
"4a-fc engines r killer for boat anchors"
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:22
|
|
My steering wheel doesn't lock. I think thats got something to do with my ignition lock being stuffed. Don't need the key to start it. My dad tried to fix it but didn't realise that when you take the ignition barrel out of a car you have to have the key in it so now I've got a heap of useless locks!
I will try that one though E30
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:27
|
|
| Quote: |
My steering wheel doesn't lock. I think thats got something to do with my ignition lock being stuffed. Don't need the key to start it. My dad tried to fix it but didn't realise that when you take the ignition barrel out of a car you have to have the key in it so now I've got a heap of useless locks
|
jaa funNY..
shit that heaps good then u dun need a key in the ingnition hole
n just turn da steerin wheel wow pretty good shit..
muhwuuhuhwuh
l8ers
JIM
"4a-fc engines r killer for boat anchors"
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:36
|
|
|
I've got a dent in the floor of the boot from doing keybangers, generally after doing a few the paint starts burning, fills the car with smoke...
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:44
|
|
There sure ain't much mechanical sympathy in this thread!
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 04:48
|
|
| Quote: |
There sure ain't much mechanical sympathy in this thread!
|
what is the meanin tfo this..??/... sumphany what u meant norbie?.. 
neways.. u got a dent in the boot... yeh okies.... now get things striaght what is keybangers??
mmmmm sets of keys bangin 2 each other?... am i rite?..lol
l8ers
JIM
"4a-fc engines r killer for boat anchors"
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 06:16
|
|
| justcallmefrank wrote on Wed, 23 October 2002 09:01 |
Sorry to hijack the thread, but my XX has what looks like a 2" exhaust with a nicer muffler, and when I rev it up and back off the throttle it crackles sometimes, is this normal? Its got a 1GEU.
|
OK apparently back fire is a "pop" noise...
crackling usually occurs on downshift....hence the revs going from high to low.....it crackles because of the change in pressure in the non-stock exhaust....thats what ive heard
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 06:17
|
|
Non of my celica's the steering locks on.
Probably should look into fixing my ignition lock. 
I think people are too scared to touch my car though. Every car at the train station but mine has flyers under the.
At one stage you could open the door locks with any key but I fixed that soon enough.
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 06:54
|
|
| Quote: |
OK apparently back fire is a "pop" noise...
crackling usually occurs on downshift....hence the revs going from high to low.....it crackles because of the change in pressure in the non-stock exhaust....thats what ive heard
|
i always have this.....its normal..always happen when i go downshift, without steppN on the accelator pedal..
ok l8ers all
"4a-fc engines r killer for boat anchors"
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 07:41
|
|
| bliz wrote on Wed, 23 October 2002 14:48 |
what is the meanin tfo this..??/... sumphany what u meant norbie?..
|
Holy crap dude, get a spell checker or something - the above sentence is a shocker!
Mechanical sympathy simply means treating your machinery properly... not treating it like you want to destroy it. "Keybangers" for example are a great way to blow your exhaust to bits. Could be very costly, and for what? You make a big noise? Whoopee...
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 07:48
|
|
Well if its just crackle...its nothing to worry about....cause like i said its just pressure changing in the non-stock exhaust
so ive been told anyway
im assuming your exhaust is not-stock ???
and anyway if it ONLY happens on downshift who cares.....its when your accelerating that really matters
in my opinion anyway
Ta
Mani
PS: yeah seriously use a spell checker
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 08:05
|
|
hahahah lol okok i type properly. it was because i was in a rush. Its not my fault,.i was typeing it without looking at the keyboard. OK. NO plz take some sympathy on that.
ok well sometimes when i go on High RPM its somestimes backfires still i dunno y.
well u guys gotta check out this drag..Its gonna shock u all about drags....http://users.bigpond.net.au/rampart/conversion/gop ed%20vs%2098%20SNAKE%20EATER1.mpg
l8ers all JIM
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 09:00
|
|
I understand a backfire to be when instead of the combusted fuel/air mixture going out the exhaust valves. it goes out the intake valves and through the intake system, carby etc. Thus causing sooty deposits on the air filter or wherever the flame and exhaust ends up.
This cannot be good.
A simple popping when decellerating down a hill or on gearchanges caused by rich fuel mixtures or an air in the exhaust system is probably what you are hearing mate.
Here's a qoute from some website Racing related though, it may be of use
Not pumping enough fuel into engine usually makes the engine backfire. This can start a fire (keep cranking engine if this happens to suck fire back into engine) or the backfire usually will bend the floats in the carburetors (check floats if you back fire engine).
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 14:00
|
|
No keybangers are not an example of mechanical sympathy, but then that little car has put up with enough abuse as it is, after all I saved it from the tip over 12 months ago, and in that time I've only replaced 1 gearbox and 1 diff, still the engine lives. Awww yeah, I put a few mufflers on it, then gave up and welded a lump of old tailshaft on in place of the exhaust (no muffler) - I'm proud of this car Its only been defected once, and deserved it so much that I shook the hands of both the officers that did it on the spot and congratulated them on taking so bloody long to put it off the road! At that stage it actually had no shocks whatsoever 
|
|
|
Location:
Adelaide
Registered:
July 2002
|
|
Re: ..::BacKFire::..
|
Wed, 23 October 2002 14:14
|
|
Bliz, let me drive yur car and i'll tell u if the backfire is normal for a sports exhaust or whether its your car thats stuffed
and as for mechanical sympathy there are some cars that just do not deserve it ie 1) rental cars/loan cars 2) Anything made by ford or holden
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 00:24
|
|
hunty i'll wait till you get online and i will talk to u personally ok.
msn or icq ...whatever.
laters
JIM
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 04:03
|
|
wow...back fires..sometimes burn inside of the engine is that?..true?...
l8ers JIM
|
|
|
Location:
Maitland, NSW
Registered:
June 2002
|
 Re: ..::BacKFire::..
|
Thu, 24 October 2002 04:47
|
|
|
Isnt backfire when fuel explodes in the exhaust system??????
|
|
|
I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 05:47
|
|
|
when fuel explodes inside the engine, that's called combustion
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 05:52
|
|
actually apparently fuel doesnt "explode"
i forget what it does actually
|
|
|
I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 05:54
|
|
in the technical sense, no fuel does not explode.
but when it's put in an enclosed space, like an engine, the energy produced by its combustion causes an explosive force due to a confined space.
whereas true explosives will explode in an open area, usually with little or no fire (despite waht movies will try and show you)
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 06:14
|
|
| Bigfrek6 wrote on Thu, 24 October 2002 14:47 |
Isnt backfire when fuel explodes in the exhaust system??????
|
No, it's when fuel ignites on the inlet side. In this situation the combustion process is effectively going backwards, hence backfire.
|
|
|
Location:
Central Coast & Sydney
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 10:06
|
|
You guys are funny. Norbie seems to be the only one who knows what's going on!
Backfiring has been explained at least twice and some of you are still getting it wrong...
Listen to the man!!!------>>>>> **Norbie**
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 11:26
|
|
LOL!
Patience... must have patience...
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Thu, 24 October 2002 11:59
|
|
Sooo, would that suggest that belching (oposing the normal flow of food) is backfiring, whereas farting (for most of us stuff only goes in one direction through that passage) is the normal end to the process of digestive combustion?
I guess it all comes down to the speed of combustion - explosives work in a much different way to fuel vapour, hence they would be useless in an engine, and Optimax isn't that much use in a mine... - but both a great at removing delicate things likes parts of the human body
|
|
|
Registered:
June 2002
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Sat, 26 October 2002 09:06
|
|
hahaha allright guys no need to get all fired up
dravan | Quote: |
(despite waht movies will try and show you
|
mmmmmmmmmm..this reminds me of fast and the furios mhwuahuhwh
norbie | Quote: |
it's when fuel ignites on the inlet side. In this situation the combustion process is effectively going backwards, hence backfire.
|
so this a good thing or bad..no1 has answer it yet??
lol
since the start of this thread.
and is this common thing?
l8ers all
JIM
|
|
|
I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
|
|
Re: ..::BacKFire::..
|
Sat, 26 October 2002 09:19
|
|
no backfire "igniting on inlet side" is not a good thing, cause risk of damaging your carby and also risk of a fire starting.
mate i suggest you look up in some books on how an engine works, look up that site "howstuffworks" that might be the address not sure or if you have microsoft encarta look engines up on there so you can see diagrams and video's on how an engine exactly works, even watch the opening into to GT3 on PS2 and then you may being to understand why it would be a bad thing,
and reduce the number of questions you need to ask.
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Sat, 26 October 2002 12:23
|
|
Yes, backfiring is definitely a bad thing... apart from the potential damage to the engine, I nearly lost my eyebrows to a backfire once! If your car is doing this, get it tuned properly and the problem will go away.
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Sat, 26 October 2002 14:14
|
|
I was tipping fuel from a gallon tin down the carby of an old celica one time (get get it to start when it had run out of fuel), the other good citizen with me decided to start cranking it over a little sooner than I bargained on, and it sneezed back and set the tin on fire 
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 09:30
|
|
hahahah oh wtf u for real..on fire?
killer..muwhuahw....
l8ers
JIM
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 10:09
|
|
|
Whats more I'm proud of it
|
|
|
Location:
Brisbane
Registered:
July 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 10:27
|
|
Whoops ... thought this thread was on how to convert the back of your car boot into a sniper box. 
Well, it does give a new meaning to the term 'back fire', right?
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 10:37
|
|
|
Well the best bit is the smoke coming up through the holes where the speakers used to live - and then telling people the the fuel tank is right under there
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 21:51
|
|
Mine is doing some impressive backfiring now. We ajusted the idel and now it's way too high and too lazy to adjust it back, and so now when I turn the car off I wait a few seconds and it lets out a huge bang and flames!
This is really bad though because now I think I've got a hole in my exhaust, and it's getting really loud.
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: ..::BacKFire::..
|
Sun, 27 October 2002 23:46
|
|
|
I'll give you an old tailshaft
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Mon, 28 October 2002 08:52
|
|
Dodgy_Haro..
| Quote: |
Whoops ... thought this thread was on how to convert the back of your car boot into a sniper box.
|
haha imagine that my car is cruisin along that sniper city.
and backfired!...and at the same time really some1 got shot..
OMG...that would b a big trouble........
mmmmmmmmm
i mite go and get my exhaust fix..hahah
or i mite get pinned down..hey?
l8ers all
JIMMY
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Mon, 28 October 2002 21:58
|
|
I'm trying to do something about backfiring. I don't think I have much of a muffler left because my exhaust is getting louder.
I love my car, so much personality
|
|
|
Location:
adel
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Mon, 28 October 2002 22:46
|
|
go and get ur exhaust renew......doesnt cost dat much.dude
l8er
JIM
|
|
|
Location:
Mornington Peninsula
Registered:
September 2002
|
|
Re: ..::BacKFire::..
|
Tue, 29 October 2002 00:52
|
|
|
I'm looking to sell it next year so I'm just paying to keep her running. There are a few exhaust places around that I might just go and raid the bins one night to see if there is anything that is suitable.
|
|
|
