backfire through the carbs ..., makes for nice fireworks! |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
backfire through the carbs ..., makes for nice fireworks! |
SirAndy |
Jan 30 2005, 01:18 AM
Post
#1
|
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 ... |
Jake Raby |
Jan 30 2005, 02:22 AM
Post
#2
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Try the Mallory with Grey springs, 12 degrees initial advance and 28 full..
90% of carb problems are ignition related. I Love carbs. |
Lo-Fi Version | Time is now: 6th June 2024 - 08:44 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |