The main culprit turned out to be a fast-idle speed screw turned in so far it prevented the choke from fully releasing, but the choke cover was also adjusted too rich for mild Southern California. It should fully release within the first 30 to 60 seconds of running.
How Engine Vacuum Works
There was way too much lead: Its fully 30 degrees did finally came in late and by 2, rpm total advance under low load climbed as high as 80 degrees! A closer look revealed a screw internally plugging the vacuum advance hose; eventually, some vacuum was able to worm its way around the threads as rpm rose. Rollings believes in old-school turning for an old-school basic carburetor. Using manifold vacuum lets the carburetion work right now without major tweaking.
That requires much finer carburetor tuning. The vacuum advance picks up and chases it.
How to Install a Car Vacuum Gauge | It Still Runs
At this point, it was on to the usual carb adjustments and minor calibration enhancements. Some would say a lean tip-in stumble calls for a larger accelerator-pump shooter. From my experience, most street or Chevys want about a No. This carb had only No.
For an early street car, we prefer a slightly rich calibration. It makes for a very driveable package. Many older cars were marginal coolers on a hot day; a tad on the rich side helps keep the charge-temp cold and cylinder temps down: Norm also holds to traditional power-valve PV gospel: It should open below half the idle vacuum reading. Playing it safe, nephew Mark installed a 5. No vacuum-secondary diaphragm spring or jet changes were needed.
Sticklers for perfection, they also went the extra mile and corrected the observed hose faults. The choke operates fine, the off-idle stumble is eliminated, and the car no longer bucks and surges.
- Use a Vacuum Gauge to Troubleshoot Your Car's Mechanical Problems?
- dating site username for girl.
- old school dating quotes.
- everyones dating but me.
I still wasn't totally happy with that though. I pulled my intake manifold back off to check for water leaks, and reseal it. I am putting it back on a little different this time Just wanted your thoughts on a healthy vacuum reading range. That's what I figured. Also not sure what's up with the two holes but I'm sure it will be fine. I stopped by ACE on the way to work and got a brass fitting that works. Anybody have a resource on vacuum testing procedures?
What the readings tell you etc.? I found some stuff on the web but I'm sure the folks here are much more knowledgeable.
I tested last night in the driveway. I got a pretty steady reading of Everything sounded great and the carb responded good. Did not make it to the lake for a load test but will do tonight. How would you condider the reading of 16 at rpm? Just hook that pup up and turn the motor on at least thats what I do. In fact, I have my gauge hooked up permanently in my truck. I think its the best way to tell what your engine is actually doing. You can start to adjust your idle mixture screws, timing, etc, to see what it does to the readings.
I like to have the idle set around rpm or so to get a solid reading. If you rev the motor up, the readings will go up. I am interested in seeing what types of readings Eric likes to see, and what rpm range. He knows A LOT more than the internet!! In fact, I think he invented the internet. No wait, that was Al Gore.
Alan, I see that in your pic you just have a cap on the brass fitting. Can you run like that?
- karachi dating and singles photo personals.
- how do i hook up the power source in ac3.
- how to install volt gauge and vacuum gauge??????????.
- How to hook up vacuum gage? - pcppk.com Forums.
- How to hook up vacuum gage??
- dating black guys vs white guys.
- Vacuum gauge hook up - EricTheCarGuy - EricTheCarGuy- Stay Dirty!.
Do you leave that fitting in there all the time? Davidg, Do you leave your fitting in or do you plan to? Check this link out guys. A good overview on vacuum readings. I don't think 16" is a bad reading. I would be happy with that. Has your engine ever been rebuilt? What kind of top speed do you get on your boat?
Last year, I was getting readings of 12 or 13, and then engine seemed to run good. I was just not as fast as I would like to have seen it.
Where to hook up vacuum gauge?
It also leaked oil from the rear main seal. I have it up to around 15" in the driveway. Once I get the intake remmounted, I am hoping for better. Thats just an automotive vacuum plug from any parts store, it runs like that and the fitting stays in permanently. David, Yes it has been rebuilt about hrs ago. Top speed is in the 44 range. I couldnt get your link to work but try this one. It says my timing needs to be advanced. I am running 10 BTDC. I like to set my timing around 12 degrees BTC. Just seems to run a little smoother at that setting.