QUOTE(mb911 @ Jan 15 2022, 07:31 AM)
Dan,
My tanks are larger.. again the proper procedure so everyone is on the same page and more detail then last response. Keep in mind I have sold 100s of tanks and have explained this thousands of times.
Thanks Ben. Appreciate your explanation. Mark, you make alot of sense too. Thanks.
Dion, on the topic of initial engine run, there's some interesting posts on pelican regarding first starts and break in. Most key in on whether the engine has new cams and/or new pistons/rings, or whether it's original components. Not sure of the details of your engine, so this may not matter for you. You may well be aware of this anyway, so please ignore if so. Most posts are consistent with what you hear regarding any type engine. New cams need constant rpm but not too fast, ensuring good oil pressure and a break in time of ~20 minutes. New rings need varying load for break in which is contrary to cam break in procedure. Most agree the make sure cams are treated nicely first, then drive it with varying load for ring seating.
Another reference is the Dempsey book on rebuilding 911 engines. His book is assuming a complete rebuild. After the initials steps of cranking engine with plugs out to ensure oil pressure, and steps for getting fuel system ready, he says to start engine, bring to 2000 rpm and using a stop watch, run it for 20 minutes. Switch off and drain the oil. Refill with oil. For the first drive, take it out for 3 to 5 miles, varying rpm and keeping it under 5k. Drive it back home and check oil level. He doesn't say whether to let the engine cool or not, but think he intends to keep it warm, just make sure you check the oil level. Then take it for a second drive of 8 to 10 miles, driving the same as the first drive. Drain the oil again. He does specify to let the engine cool completely before driving again the following day. On the following day, check ignition timing and adjust carbs as needed, warm up by driving and then check oil level again. He recommends another oil change at 500 miles along with adjusting valve clearance, at least on magnesium case engines.
Lots of opinions out there. Dempsey's seems hyper-conservative nth degree of perfection as opposed to just jump in and drive it and change the oil after it starts looking dark would kinda be on the other end.
Dan