A Petrol engine, only produces vacuum when the throttles are closed! If the throttle is open, the vacuum is lost? So this might help economy and emissions but not really performance or power?
How do you know what the distributor’s curve is? You mentioned Advanced; mine has been rebuilt by Jeff for a stock engine but since then i have rebuilt my engine and put a GP2 equivalent cam in. This is recently so I’m going to let it run in for a season but maybe a vacuum advance would be a good project for next spring…
thats a very good question. Not my area of expertise for sure. Best thing of course is just call the shop that rebuilt the distributor. I don't remember details but mine was a little off from what British Vacuum recommended. However runs well and cool and more responsive. If I remember correctly when I had the ignition system out and was working on the vacuum install I could look down inside the distributor. I could see the flying "weight" pretty clearly and they had a number and a degree mark on the weight. I think thats the curve? My distributor probably only has 500 miles on it since rebuild so i'll let it run for a while before dealing with the shipping out, etc. However since you have changed your cam and done more extensive stuff might be something you do sooner than later. good luck.
@@charlesbaker4508 don’t know and don’t care. Sort of. I use vacuum method only for a lot of reasons. The marks are just not accurate in an old engine.
I spent yesterday afternoon "tuning" a friends recently purchased '74 TR6. The vacuum retard has to go. It runs rich so I'll adjust the carbs after I replace the retard can with an advance. His actually was timed by a previous mechanic that had the rotor up and rotated some which made it not start when I put it down in the proper position. I set the timing by ear and vacuum like you did. The 1-3 spark plugs looked okay but the 4-6 were very dark, so I'll be leaning that one out. Thank you for the dizzy tips for the new vac can. Great video.
For right now plug the vacuum retard and tune without it but leave it disconnected (plugged) until you convert. I would place a vacuum cap over the carb nipple.
I was going to do exactly that when he brings it back over. First, he needs to replace his transmission rear seal. It left a 6" puddle of oil on my shop floor after 3 hours. Do you have trouble with oil leaks? @@DIYHelp
Very nice video. Extremely well done. I have just completed this project but I need to sync the carbs and work on the fuel mixture. Thanks for all the advice.
