Engine first start attempt., Couple vacuum leaks, Finally adustable idle. |
|
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. |
|
Engine first start attempt., Couple vacuum leaks, Finally adustable idle. |
Olympic 914 |
May 23 2017, 07:30 AM
Post
#1
|
Group: Members Posts: 1,671 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
Engine first start, Fail.
Yesterday I made the first attempt at starting the engine since rebuild. I had put two gallons of 93 octane gas into the tank and the pump runs as it should when turning the key. I had a timer ready to perform the 20 minute cam break in. I was arrogant enough to believe that the engine would simply start when I finally tried it. WRONG. It caught for a few moments then died. And subsequent attempts gave no better of a response. I had turned the engine over with the coil disconnected to build up oil pressure before attempting the start. And thought I may have run the battery down some. Checking it showed 12.56v resting and 11.44 while cranking. I connected a big boat battery with jumper cables but still no start. It turns over and fires a couple times giving of puffs of exhaust, but does not catch and keep running. Pulled a FI hose and checked that I am getting gas, also pulled two plugs and they are wet with gas. I thought I may have flooded it so I put the battery charger on it and put it back in the garage. This morning I tried it again and the result was the same. It fires a couple times then just cranks. Everything is new. Cap and rotor, points condenser plug wires etc. injectors rebuilt buy Witchhunters , static timed when I put in the distributor. All new vacuum hoses, rebuilt MPS (set to 037 specs) ECU is an unknown but it worked when ran last (in ’89) all the wiring was carefully checked when installed Engine build is as follows. EA 1.7 engine built into a 2056 Using the djet FI with 2.0 parts, intake runners, throttle body, air cleaner, etc. HAM heads ported to RS+ and modified for the 2.0 runners Raby 9590 cam Guess I will start with rechecking the timing and go from there. |
gereed75 |
May 26 2017, 11:22 AM
Post
#2
|
Senior Member Group: Members Posts: 1,247 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
Interesting Chris. If I understand you correctly you mount carbs to run the engine for the breakin and then mount the unknown FI and do the final tune??
What procedure do you use for the actual cam run in to avoid the heat of just having the car set there and run with minimal airflow?? Thanks |
ChrisFoley |
May 26 2017, 02:47 PM
Post
#3
|
I am Tangerine Racing Group: Members Posts: 7,927 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Interesting Chris. If I understand you correctly you mount carbs to run the engine for the breakin and then mount the unknown FI and do the final tune?? Yes, that way I know I can get the engine running quickly, check for oil leaks, get the timing close, and do the cam break-in without delays or letting the engine idle for any length of time. I prefer not to start/stop the engine more than 2 or 3 times before setting the rpm up to 2500 and let it go for 20+ minutes. I can set the rpm with the idle speed screws so I don't have to hold the throttle myself. It's not important if the mixture is less than ideal as long as its not so rich or so lean to have trouble running. Without any load it takes very little energy to hold the elevated rpm. QUOTE What procedure do you use for the actual cam run in to avoid the heat of just having the car set there and run with minimal airflow?? Thanks The oil gets hot but the engine doesn't overheat. It's not working hard enough to really get the heads that hot, and the fan is spinning fast enough to remove that much heat effectively. |
Lo-Fi Version | Time is now: 21st May 2024 - 12:33 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 ... |