Lyndon
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Everything posted by Lyndon
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I haven't got to the plumbing stage yet. If gravity fed I'm sure the bings would work fine. But if they run through an electric fuel pump. Let alone two what I'm contemplating it will not work. You need pressure to run through a dead pump. Not much but it is more that a tank in a high wing
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I also to be clear. Was indicating in a failure. The spare pump for take off and landing be run thru the battery. Nothing else. I'm involved in race engines that run a total loss system. As charging equals horse power. If they were a plane you would easily find a spot to land.
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As I say I'm new to this. I was thinking you cut the fuel to a Rotax to stop it. I was of the understanding once running turning off the master does not stop it running. My apologies. I thought it had a redundant ignition system. Lyndon
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Current diesel engines run and electric to feed the real pump which is mechanical and does all the work. But these are direct injection and run well ove 20,000 psi. Some to almost 30,000 in a performance diesel. But these are the ignition system with a boosted engine. Thus the pressure. Apart from these I think everything with a spark plug uses and electric pump as it it goes in under no pressure.
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Before you disassemble. Scribe your splines with a 1 mm feeler. After cleaning and inspection, assembly with it all settled. Adjust your shims to the 1 mm Scribe. Perfect. Depress a bit over 1 mm install your new halves and it's done .
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Ps always new halves
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Shim as required
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Is .039 tho or a mil unloaded. Depress then fit halves. Easy as
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Did you find out why the pump failed ???.
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Does the current efi engine run a mechanical pump ???. If it does then I will rethink my fuel arrangements. Because one thing I can assure is the carburetor is dead. Even in my lifetime.
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Your mis understand. Sorry. What I'm saying the battery is not dead. You have killed one circuit with the master switch. But you can have another. Yes I do know the meaning of master. But you get my drift. Believe me your engine still runs even your master turned off
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Guess really what I'm saying is a mechanical pump any better than an electrical one. I can answer that. No one makes a mechanical pump any more. So two separate circuits two pumps should be fine. Yep no one makes a flat tappet engine either. Unless your Rotax. . They do both because it works. Not great but it works. If they were building car engines they would be broke. I totally understand the litigious society we live in. It's a Shame really.
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I may be wrong. But you kill every thing. What I do know is the engine still runs if it gets fuel. The battery still has a full charge. On a complete redundant circuit is another pump. Has to have 30 to 60 mins in it. Pumps don't fail and wiring looms don't burn for no reason. I'm very particular in what I do and I would be very surprised if you needed the second backup. Then the third is to land which is easy in a Savannah. But like I say I'm new to this so I really appreciate your comments. Lyndon
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The battery is still alive after a master has been cut
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More likely a wing to fall off than two circuits fail at the same time
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The master does not turn off the engine. It still fires the plugs. What I'm saying is two separate fuel pumps. Easy to wire on two curcits
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Yes I get that. Cut all electrical power and hope it stops burning. All being well the engine keeps running as it produces its own power. But on a redundant loom is your back up pump. It still pumps ???
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Update. The main thru bolts are a torque to yield arrangement. Without checking 15 nm plus 180. I'm doing some research but in my industry torque to yield are one off use. I will get back to you. Ps I have to tool to remove the rear the engine if any one needs that. Also I'm about to do the gearbox service and preload. If anyone has thought of saving 600 bucks and doing it themselves. Lyndon
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I'm new to this but I have a mechanical background. I understand why we have a back up pump. One electric and and mechanical. The electrical backing up the mechanical. I'm building a Savannah. I'm freshening up a 912 uls with 1740 hrs on it. I have priced a new mechanical pump. Outrageous. Why not fit an electric pump. Separate circuit that runs 100 %. This will easily do 2000 hrs. I have a back up. Chances of both failing are no more than electric and mechanical. Engine looses charge rate I'm guessing after shutting down excess power the battery will run it for at least 30 to 60 mins. Battery dies then as long as the engine is running it has power. I'm guessing the efi engine that Rotax make does not have a mechanical pump ???. Like I say I'm new to this and appreciate any input. Lyndon
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Update. I've been waiting for a crankcase Dowell. Anyway pulled the lifters apart and cleaned them. Absolutely perfect at 1740 hrs
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Does anyone have a crankcase Dowell. I have lost one Lyndon Wright
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I think that is being polite. Why would anyone like Rotax buy an off the shelf oring for a dollar then sell it through their network at twenty dollars. Makes no sense. Just mark it up three hundred percent and sell it for three dollars. Then everyone is happy. The rings were outrageous but I didn't have much choice there.
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I priced up genuine orings. Gee it would run at about 700 bucks. For one tenth I bought off the shelf jobbies. Almost 29 plus gst for a rocker cover o ring. Plus over 4 for the center bolt. There are no words to describe it. Lyndon
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I could not find any info on splitting the cases. Maybe you all know but case bolts studs etc is 25 nm. This seems to be secret. Cam timing is a breeze. Replace to two orings. Use three bond with a one not a two. Five dowels . Apart from that there is nothing else in the cases. Easiest thing you will ever do. Nitraded cam and hardened lifters. I don't think that works but I'm no expert. It was worn at 1740 hrs. So I'm guessing at 1000 hrs it would have been comprised. If Rotax got rid of the 1920s flat tappet cam I would not not have to do this. Lyndon
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That's it correct
