| [ Total Views: 524 | Total Replies: 14 | Thread Id: 62651 ] |
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 phil
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| posted on May 21st, 2007 at 04:24 PM |
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popping carbies
hey fellas!
can anyone help me with this ?
for some time now my car has been backfiring through the carbies when cold....runs great when warmed up.
it's a 1640 t1 engine with dual kadron setup and cheapie extractor exhaust, 009 dist.and compufire module, otherwise standard...carbies seem balanced
with throttle plates? equal and mixture screws turned in till stumble then back 1/4 - 1/2 turn.
any ideas?
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56astro
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| posted on May 21st, 2007 at 05:03 PM |
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Have you tried to do a search?
There are heaps of threads about "popping" through carbies.
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa |
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 Bizarre
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| posted on May 21st, 2007 at 05:32 PM |
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Read hear
http://www.lowbugget.com/main_page.html
basically -
Popping out the top of carb:
Incorrect Jetting.
Clogged idle jet.
The distributor is not advancing correctly
incorrect accelerator fuel squirt adjustment.
Small main jet.
To big of venturies.
Check your linkage, make it open the carbs not close or hold them open.
Is the timing correct? I do not recommend setting your timing at idle or static.
This is just for getting it to start and should be set afterwards with a timing gun set at full
advance.
My guess is to lean as it goes away when warm
Futue te ipsum!!!
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Oasis
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| posted on May 21st, 2007 at 05:35 PM |
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Could be the linkage. When the engine "grows" when it gets hot the linkage comes good which might explain what it does only when it's cold,
especially with Kads. my 2c
"Tell him 'We've already got one'"
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ian.mezz
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| posted on May 21st, 2007 at 08:10 PM |
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I had a bug do that and i found that i had a few inlet tappets that needed adjusting:o
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phil
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| posted on May 21st, 2007 at 09:48 PM |
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thanks all.
did a search....nothing new there.
i will double check for air leaks, then
i guess i will richen mixture a little and see what happens...then maybe advance? the timing a little.
met a mechanic at work a couple of weeks ago who believes the quality of fuel is responsible...says FI systems can cope with variable fuel better than
carb...says quality of fuel has been poor for a couple of years?
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ancientbugger
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| posted on May 21st, 2007 at 10:04 PM |
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I'd guess your choke (if you have one) isn't working properly. In colder temperatures the cooler air would be more dense and so you'll be
effectively running lean but as the engine warms up so would the air going into the engine.
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Craig Torrens
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| posted on May 21st, 2007 at 10:04 PM |
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your linkage is out, you just need to adjust.
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Craig Torrens
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| posted on May 21st, 2007 at 10:06 PM |
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| Quote: | Originally
posted by Bizarre
My guess is to lean as it goes away when warm
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How did you come up with this one ? :jesus
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phil
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| posted on May 21st, 2007 at 10:13 PM |
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| Quote: | Originally
posted by Craig Torrens
| Quote: | Originally
posted by Bizarre
My guess is to lean as it goes away when warm
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How did you come up with this one ? :jesus
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i thought this sounded ok?
no choke on kadron/solex kits, therefore a bit lean when cold..or is it an absence of enriched mixture when cold? therfore behaves as though lean
until warmed up
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phil
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| posted on May 21st, 2007 at 10:16 PM |
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yeah..thanks Craig..i thought i had linkages right but on reflection i have been tricked by them before
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Bizarre
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| posted on May 21st, 2007 at 10:25 PM |
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| Quote: | Originally
posted by Craig Torrens
How did you come up with this one ? :jesus
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VERY common sympton on Webers to "snap" out the top of the carb when idling on a cold morning if the idle jet is "just" lean.
Dont worry craig - one day you will understand. :alien
[ Edited on 21-5-2007 by Bizarre ]
Futue te ipsum!!!
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plebs
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| posted on May 22nd, 2007 at 12:28 PM |
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| Quote: | Originally
posted by phil
thanks all.
did a search....nothing new there.
i will double check for air leaks, then
i guess i will richen mixture a little and see what happens...then maybe advance? the timing a little.
met a mechanic at work a couple of weeks ago who believes the quality of fuel is responsible...says FI systems can cope with variable fuel better than
carb...says quality of fuel has been poor for a couple of years?
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I had this just recently, bad fuel from a dodgy cheap station, I had to drain the tank and run it dry then refill with brand name PULP and all was
well.
Stock as a rock and slooooooooooooooooow
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Craig Torrens
A.k.a.: Craig Torrens
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| posted on May 22nd, 2007 at 09:07 PM |
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| Quote: | Originally
posted by Bizarre
| Quote: | Originally
posted by Craig Torrens
How did you come up with this one ? :jesus
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VERY common sympton on Webers to "snap" out the top of the carb when idling on a cold morning if the idle jet is "just" lean.
Dont worry craig - one day you will understand. :alien
[ Edited on 21-5-2007 by Bizarre ]
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I hope so Barry :kiss
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phil
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| posted on May 22nd, 2007 at 10:09 PM |
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:blush
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