Dual Carb Problem need help |
|
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. |
|
Dual Carb Problem need help |
Cazz |
Mar 17 2018, 12:38 PM
Post
#1
|
Newbie Group: Members Posts: 13 Joined: 22-December 16 From: NC Member No.: 20,688 Region Association: None |
Any carb specialists out there? I need help with a carb problem.
-1974 2.0 with dual weber carbs -The car is spitting and popping out the carb on cylinders 1&2and also backfiring alittle. I've rebuilt the carbs and pulled this carb off again completely taking it apart and checking with no obvious issues found -With the car idling when I put my hand over each barrel on this carb there is no suction at all on my hand. The idle doesn't drop at all. Doesn't respond to any adjustments on the fuel/air mixture screws. -The carb is injecting fuel streams when I open the linkage by hand -On the carb on the opposite side when I put my hand over each velocity stack it really pulls air really hard on my hand and the car will bog down and shut off as it should. -I have new intake gaskets an new carb base gaskets installed. I sprayed carb cleaner around the base of the carb and also at the head with no change in idle. Any ideas? Is this car basically running on 2 cylinders? -On the opposite carb on cylinders |
McMark |
Mar 21 2018, 10:23 AM
Post
#2
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Also the suction in one cylinder is created by the firing of another cylinder. So if the timing is off, it will reduce the power produced by that cylinder, and that reduction in power translates to a reduction in suction on the intake-stroke cylinder because the crank isn't turning with as much force.
|
Lo-Fi Version | Time is now: 31st October 2024 - 05:50 PM |
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 ... |