Backfiring out the carbie
#1
Posted 03 March 2006 - 05:05 PM
Anyway, putting fuel etc in it now, i'm gonna try and get the damn thing running tomorrow morning with some mates around, but I'd like to tackle it with a few possible solutions in my head. Rick said the needle in the carbie may be stuck, and it is backfiring out of the carbie... it really doesn't like it when we pour petrol down there, it will either crank over a few times and then die in the arse, or do the same and backfire in the pourer's face.
Why is it backfiring out of the carbie? Any typical reasons for it to do so?
I've got a whole spare engine here now, so I should be able to prime the lines one way or another, and we're gonna rekit the carbie tomorrow as well if all goes to plan. Any things to remember or try?
Even if it's running like shit, I'm still happy. As far as I know it's not a timing problem coz none of the timing has been touched really. Thanks in advance
#2 _MYLJ_
Posted 03 March 2006 - 05:14 PM
#3 _rorym_
Posted 03 March 2006 - 05:19 PM
R
#4
Posted 03 March 2006 - 05:45 PM
I hope it's not a bent valve, but your 186 head is gonna go on there soon anyway. Tell me about that "Lean out backfire" because that sounds like what may be happening. Trying to get the fuel pump working at the moment.
#5 _Yella SLuR_
Posted 03 March 2006 - 06:09 PM
Edited by Yella SLuR, 03 March 2006 - 06:11 PM.
#6 _MYLJ_
Posted 03 March 2006 - 06:15 PM
Lean backfire would take me all night to explain fully (and then I'd probably be wrong anyway ) but I've had a holden six that would start and Idle but when you opened the throttle up the motor popped and stopped, the main jets were blocked and it was leaning out as it came off the idle curciut as it gets more air as the butterfly opens, thus leaning out. If you have been poring fuel down its throut and it pops its not lean (rich maybe but not lean)
I have also suffered a lean out backfire when doing burnouts at high rpm, not a good idea to run out of fuel suddenlyat 8800rpm
#7 _Loki_
Posted 03 March 2006 - 06:21 PM
I'd get the fuel sorted out, pump working lines primed properly before trying to work out why it isn't running properly when it's fuel delivery method is a can down it's throat
Edited by Loki, 03 March 2006 - 06:23 PM.
#8 _rorym_
Posted 03 March 2006 - 06:30 PM
R
#9 _Jewboy_
Posted 03 March 2006 - 10:05 PM
I forgot to mention that be sure the dissy is on the right stroke by checking that the points are starting to open when your at #1. You can get a car to run if its 180 degrees out but it runs like crap (i've bought 2 cars from people who have done this and is why they get rid of them) which might explain most of your probs.
Edited by Jewboy, 03 March 2006 - 10:14 PM.
#10
Posted 03 March 2006 - 10:52 PM
Easier and quicker to take off oil cap. Valve forward of oil cap is No1 inlet. Rotate engine in direction of rotation. Watch this valve open and close and the next time the timing mark lines up is No1 compression.
RACV MAN
#11
Posted 04 March 2006 - 07:50 AM
I'll stick the other fuel pump in and replace the filter-pump hose because it's fractured, hopefully that will get me somewhere before Stewart rocks up.
#12 _rorym_
Posted 04 March 2006 - 08:33 AM
R
#13
Posted 04 March 2006 - 12:59 PM
We rebuild the Stromberg, I stuck a different fuel pump on there and cranked it over for yonks, but it got there in the end.
Ahhh man, so stoked. Thanks for all the advice, and the backfiring was just a lean-out thing. Once the fuel is pumping through there it runs, but I still need to fix a fuel pump leak :( and find a battery that has some life.
#14
Posted 04 March 2006 - 02:07 PM
If it sits for long periods in the weather don't put it on. The shoes will stick to the drums.
RACV MAN
Edited by rodomo, 04 March 2006 - 02:07 PM.
#15
Posted 04 March 2006 - 02:20 PM
#16 _Loki_
Posted 04 March 2006 - 05:16 PM
Told yaand the backfiring was just a lean-out thing. Once the fuel is pumping through there it runs.
Get it breathing first (Getting proper Air + fuel delivery, no leaks etc.) then worry about it's circulation (Timing )
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