Macbeast
|
| posted on 27/5/12 at 04:58 PM |
|
|
Popping on Overrun
1.6 Pinto with Weber 2V carb. Searching suggests popping is due to mixture too weak. Presumably this would be the idle setting ?
Do you enrich the idle mixture by screwing the idle adjustment screw IN ? or OUT ?
I'm addicted to brake fluid, but I can stop anytime.
|
|
|
|
|
jacko
|
| posted on 27/5/12 at 05:02 PM |
|
|
It can be caused by a air leak in the exhaust too
Jacko
|
|
|
owelly
|
| posted on 27/5/12 at 06:49 PM |
|
|
I would check for air leaks as suggested, but also check the inlet manifold. If its letting air get in, it could cause popping.
http://www.ppcmag.co.uk
|
|
|
ash_hammond
|
| posted on 27/5/12 at 07:33 PM |
|
|
What is a good way to spot air leaks in an exhaust and inlet system?
.: www.mac1motorsports.co.uk | www.m1moc.com :.
|
|
|
jacko
|
| posted on 27/5/12 at 09:04 PM |
|
|
quote:
Originally posted by ash_hammond
What is a good way to spot air leaks in an exhaust and inlet system?
look for soot marks on joints
|
|
|
austin man
|
| posted on 27/5/12 at 09:20 PM |
|
|
WD 40 is a good test for air leaks on the induction side spray on manifold and see if tickover / revs increase
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
coozer
|
| posted on 27/5/12 at 09:39 PM |
|
|
I want mine to pop and bang on the over run.. going down the hills brrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.. a few bangs, pop would be
better
1972 V8 Jago
1980 Z750
|
|
|
steve m
|
| posted on 27/5/12 at 10:13 PM |
|
|
My old xflow does all the popping and banging i need,
So what you "new boys want" is real engine with carbs and proper ignition
none of this fancy "pc/eco" shite
hahaha
steve
|
|
|
Macbeast
|
| posted on 28/5/12 at 12:30 AM |
|
|
So again the specific question - Do you enrich the idle mixture by screwing the idle adjustment screw IN ? or OUT ? (on a Weber 2V )
I'm addicted to brake fluid, but I can stop anytime.
|
|
|
greavesy7
|
| posted on 28/5/12 at 05:20 AM |
|
|
carbs
i would say you screw it out but theres no harm in marking the current posission and then trying both as long as you can put it back to wear it was.
popping is usually due to over fueling or air leaks if the mixture is too weak they tend to spit out the carbs
|
|
|
Macbeast
|
| posted on 28/5/12 at 06:32 AM |
|
|
I also wondered if it could be too much ignition advance - take your foot off accelerator and vacuum advances timing too much ?
I'm addicted to brake fluid, but I can stop anytime.
|
|
|
cliftyhanger
|
| posted on 28/5/12 at 06:44 AM |
|
|
I thought popping on overrun is almost normal.
Having had a few "old cars" with SU carbs, they can be great at popping/banging, and later versions introduced a naff little valve in the
carb butterfly to enable air to be sucked through on overrun. These often get soldered up.
It is because when the butterfly is shut, there is a bigger vacuum over the jet, sucks more fuel, but much less air. Unburnt fuel enters hot exhaust,
and burns there instead. Bang. Same sort of reason you can get flames out he exhaust if you try
If the car is running correctly everywhere else, I would leave it. Otherwise you need to fit some sort of overrun valve.
|
|
|
mad-butcher
|
| posted on 28/5/12 at 08:14 AM |
|
|
mine pops, burbles and flames out the exhaust when you take your foot off the throttle from 10500 just can't be arsed looking for the air leak,
sounds magic pulling off the M53 at 2am on my way to work.
|
|
|
Macbeast
|
| posted on 28/5/12 at 11:26 AM |
|
|
OK I'll leave it. Thanks all for replies.
I'm addicted to brake fluid, but I can stop anytime.
|
|
|
Dingz
|
| posted on 28/5/12 at 01:04 PM |
|
|
In to richen I believe, the screw increases the amount of air to mix with the fuel from the idle jet.
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
|
|
|
.JPG)
.jpg)
