 backfire through the carbs ..., makes for nice fireworks! |
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| SirAndy |
  Jan 30 2005, 01:18 AM
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Resident German  Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California  |
hey, it's me again, the "carb-hater" !!! (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
i've been trying to get this engine to run right for what now, 10 months??? (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) i still have a issue with backfires upwards through the carbs (looks cool at night with the GT-engine lid) !!! now here's my question: - i'm still running stock (well, SSI) heat-exchangers and a close to stock (Manta) exhaust. - i have a cam with a lot of overlap. could the stock(ish) exhaust setup cause too much backpressure and the engine doesn't flow and belches back through the carbs ???? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Andy PS: this happens all over the rpm range, but more often under lower rpm load and higher rpm "cruise" (steady gas) and only sporadically at WOT ... |
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Posts in this topic
SirAndy backfire through the carbs ... Jan 30 2005, 01:18 AM
Aaron Cox what dizzy? what cam? where is your timing set? Jan 30 2005, 01:21 AM SirAndy ... Jan 30 2005, 01:43 AM Jake Raby Toss the fuckin 050! The advance curve is prob... Jan 30 2005, 01:48 AM redshift What's your fuel mixture doing, and what aboot... Jan 30 2005, 01:49 AM SirAndy ... Jan 30 2005, 02:07 AM Jake Raby Try the Mallory with Grey springs, 12 degrees init... Jan 30 2005, 02:22 AM sixnotfour A Shop next door had a speedster that did the same... Jan 30 2005, 02:25 AM Air_Cooled_Nut If it's backfiring thru the exhaust (post igni... Jan 30 2005, 03:42 PM jwalters Yea, I had the same problem with my 1.7---stock ex... Jan 30 2005, 05:28 PM SirAndy ... Jan 30 2005, 06:15 PM jwalters I think my problem was the aluminum pushrods-the o... Jan 30 2005, 06:20 PM Joseph Mills <... Jan 30 2005, 06:32 PM SirAndy ... Jan 30 2005, 06:34 PM r_towle my gut says valves are either sticking, rockers mi... Jan 30 2005, 06:43 PM jwalters So it would be safe to assume you do not know the ... Jan 30 2005, 06:45 PM r_towle sorry,
I wanted to ad one thing.
Carbs are stupid ... Jan 30 2005, 06:45 PM jwalters <... Jan 30 2005, 06:51 PM redshift It just sounds like late/early spark to me... and ... Jan 30 2005, 07:53 PM tesserra Andy,
Did you try a manifold vacum gauge?
If you ... Jan 30 2005, 08:03 PM Carrera916 Andy....
The key word you used awhile ago...overl... Jan 31 2005, 02:02 PM redshift CHANGE THE DAMN .50 ALREADY! AND REPORT!
... Jan 31 2005, 04:23 PM SGB Before ya tear it down, I would try opening up int... Jan 31 2005, 04:34 PM synthesisdv maybe carbs are out of sync?
twisted throttle pla... Jan 31 2005, 04:37 PM redshift hehehe.. MAYBE IF YOU CHANGE YOUR ROTOR CAP....
A... Jan 31 2005, 04:46 PM SirAndy ... Jan 31 2005, 05:05 PM andys Jan 31 2005, 05:23 PM
DJsRepS You should try another dizzy. Try to borrow a Mall... Feb 4 2005, 05:45 AM  |
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