Starting my engine on a stand, issues arose |
|
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. |
|
Starting my engine on a stand, issues arose |
malcolm2 |
Sep 29 2020, 06:16 AM
Post
#41
|
Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I have built a fresh 2.0 and borrowed a set of weber 40s to get her running, broken-in etc....
I bought a new single vacuum distributor with the flame thrower 3 module inside. Also bought the Petronix coil. I built up oil pressure, then connected the gas lines, fuel pump, and coil. Tach and timing light too. After a few tries, she started. As expected running very ruff. Back-firing thru the carbs. I loosened the distributor and tried to make some adjustments. That seemed to help the back-firing a bit, but not totally. I got the idle timing to what looks like 7 btdc, but it is tuff to work everything without a helper. I know next to nothing about these carbs, and about the same amount to tune them enough to bench run the engine, but I am looking into that. Any help would be appreciated on the carbs. I got it idling, again, very ruff. So I wanted to do the cam break in, so I rev'd it up to about 3000 and held there. Maybe a minute and the revs dropped and I had to putz with the accelerator to keep her going. Again up to 3000, same thing revs dropped. I have a note in to my distributor vendor about how this "rev limiter" on this module works. So three things here. She is still running ruff, back-firing etc...and there is the high rev cut-off. Lastly the carbs, any quick checks or adjustments there? Any thoughts or suggestions? |
Superhawk996 |
Sep 29 2020, 01:57 PM
Post
#42
|
914 Guru Group: Members Posts: 5,903 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
@mark henry
Curious if you have used a Uni-Syn. That's what I've always used and had great luck with that. |
malcolm2 |
Sep 29 2020, 04:22 PM
Post
#43
|
Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
@mark henry Curious if you have used a Uni-Syn. That's what I've always used and had great luck with that. That Uni-SYn looks totally different. Does it work the same? Looks like it just sits on top of the barrel. Several on eBay for 1/2 the China one. I have a raised dis-taste for all things Chinese. I am sure you know why. |
IronHillRestorations |
Sep 30 2020, 11:06 AM
Post
#44
|
I. I. R. C. Group: Members Posts: 6,731 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
@mark henry Curious if you have used a Uni-Syn. That's what I've always used and had great luck with that. That Uni-SYn looks totally different. Does it work the same? Looks like it just sits on top of the barrel. Several on eBay for 1/2 the China one. I have a raised dis-taste for all things Chinese. I am sure you know why. Step #9 from my post (if you have a Uni-syn, give it to someone you don't like and purchase a STE airflow meter) Unisyn restricts airflow and isn't worth the space in your toolbox. If you are going to have an engine with carbs, you need a STE. Can you make it work? Yes but everytime you put it one one of the barrels the engine will start to stumble, not so with the STE |
porschetub |
Sep 30 2020, 01:48 PM
Post
#45
|
Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
@mark henry Curious if you have used a Uni-Syn. That's what I've always used and had great luck with that. That Uni-SYn looks totally different. Does it work the same? Looks like it just sits on top of the barrel. Several on eBay for 1/2 the China one. I have a raised dis-taste for all things Chinese. I am sure you know why. Step #9 from my post (if you have a Uni-syn, give it to someone you don't like and purchase a STE airflow meter) Unisyn restricts airflow and isn't worth the space in your toolbox. If you are going to have an engine with carbs, you need a STE. Can you make it work? Yes but everytime you put it one one of the barrels the engine will start to stumble, not so with the STE (IMG:style_emoticons/default/agree.gif) I was given one years ago and never thought it worked very well,as mentioned it didn't fit on some carbs I had. I got the STE one and its great with my Zenith's,there is no restriction like the Motometer (Uni-syn ) that I had. My experience with carbs has taught me to clean,inspect and overhaul if needed before fitting,last set of used Dellorto's I fitted were very clean and looked new on the outside however when cleaning I found dry hard gaskets and bad pump diaphrams,lots of crap in the fuel bowls and elsewhere too. Also its better to do base line setting before running up and make sure you use new manifold and carb base gaskets. Good luck to the OP. |
Lo-Fi Version | Time is now: 10th June 2024 - 05:44 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 ... |