backfire through the carbs ..., makes for nice fireworks! |
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backfire through the carbs ..., makes for nice fireworks! |
SirAndy |
Jan 30 2005, 01:18 AM
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#1
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Resident German Group: Admin Posts: 41,675 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 ... |
jwalters |
Jan 30 2005, 06:51 PM
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Sooo Close....... Group: Members Posts: 1,677 Joined: 14-May 04 From: Huntsville, AL Member No.: 2,068 Region Association: Europe |
This is actually a good point--I failed to mention that during all my carb tuning I discovered one of the butterflies had moved on the rod a little and was actually holding the carb slightly in idle / main sequence----it DID partially cure the same problem with mine as yours, but not 100% the other was the lash-- Point--contributory factors = a big factor-- I was so pissed at myself for not noticing this until my 4th carb rebuild!!! Not saying you have the same problem tho--just a little more info for ya------- |
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