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Member postings for William Morrison

Here is a list of all the postings William Morrison has made in our forums. Click on a thread name to jump to the thread.

Thread: How do you react when you break a model?
23/03/2015 16:18:15

First I pick up the pieces, then try to access what happened and why. After that I have to determine if I have enough model left to rebuild it. I think a model, especially ARFs should be rebuilt at least one time. Sometimes the crash is so violent, there is just a bag of trash to pick up and some things to salvage. I am building up my supply of hardware and fuel tanks..

Thread: stuck bearing
02/01/2015 17:12:08

Saito engines have sealed bearings in the front. I have not run into other engines that did so. Some would retain shields on the main bearing fearing debris getting into or out of the bearing. Personally, I remove the shields on the main bearings to enhance the flow through of lubricant to the cam area. I do not think the shields will totally interrupt the flow of lubricant to the cam box but I would rather have more than less.

Thread: ASP 61 FS without locknut?
02/01/2015 17:02:52

You will do fine as is. Just make sure you really put the torque to the first nut. I do it all the time with not issues. Besides you will have a cone to collect the nuts if they should come loose.

Thread: help with SC91 FS
02/01/2015 16:56:06

I once cleaned the carb on my Magnum.91 (which is the same as your ASP .91) and got the idle needle way out of kilter. I sent a message to the US distributor and he said, turn the carb up side down while off the engine. The low speed needle should be half way across the split in the fuel feed. Very easy to see when the carb is off the engine and inverted. After resetting the low speed needle, after reassembly, open up the high speed needle and start with an excessive rich position like 4 turns out. Use a TACH and reset your high end at peak less 300 RPM to the rich side. If you have to tweak the low needle do it in very very small increments, like a 1/8th of a turn or less.

One other thing I do is to insert a 1/4 inch of fuel tubing on the high speed needle valve needle and screw it back into the carb so that the tube is compressed and seals up the high speed needle valve. There is a tendency for the O-ring to not do its job of sealing and this ensures a seal where no extra air is sucked into the mixture.

And yes check your plumbing all the way from the sound suppressor (what we call the muffler) to the carb via the tank. I have had the sound suppressor nipple to be blocked, make sure it is clean. Always set up your sound suppressor so that the pressure nipple is up, that way when you are not flying fuel residue will not collect in that area. Also make sure that tube from the intake manifold to the cam box in the front of the engine does not have any cracks or pin holes.

Thread: Four stroke crankcase venting
26/11/2014 22:09:26

Rust. I would suspect the quality of the bearings. The manufacturer gets the cheapest bearings he can to maximize is return initial sales. High quality bearings resist rust. I live in a moderate dust and humidity region and have little or no rust. But them most of my engines have had bearings replaced by good after market bearings. And no I do not use stainless steel or ceramic bearings. We have two bearing dealers in the states that deal almost exclusively in bearing for our small engines.

Thread: Do you stick to your TX maker's RXs?
22/11/2014 17:41:03

I use the Hitec Aurora 9 and generally use the Hitec receivers. But I do have an after market receiver, 8 channel that cost a fifth of what 7 channel Hitec receiver would cost. Does not have the telemetry feature so do not get the battery feed back (which I like very much). But money is money, and saving some of it is always worthwhile.

Thread: 4 stroke engine question
06/11/2014 17:49:52

In Saito engines the front bearing is usually sealed not shielded. The main bearing is usually open but shielding could be present. It would serve no essential purpose to shield the main bearing as that is a debris free area. Internal debris is usually caused by the bearing disintegrating. If your bearing gets that far in to destruction, I doubt a shield will help more likely to contribute to the otherwise bad situation inside the crankcase.

I always use some Castor oil in my fuel, it provides short term lean burn protection and long time rust prevention. Brian Wynch is full of bunk regarding the use of Castor oil. Castor does present clean up problems but the mere presence indicates it is doing its job - lubricating and protecting the engine.

US Saito instructions and Magnum instructions recommend 20% lubrication that includes the use of some Castor oil. Performance oriented users tend to use less oil and fuel suppliers generally provide less oil in the mix (to save a dime or two). So I add a couple of ounces per gallon of Castor oil to the mix even if it is a blended fuel with Castor already being use in the mix. Better safe than sorry!

I live in an area in the US that has humidity in the 30 to 40% range. I have Saitos, Magnums (same as ASP), OS and YS four strokes. I rarely use after run oil but do run my engines dry. I do not have a rust problem.

Thread: What's the main radio brand you fly?
14/05/2014 20:33:43

I used to use Futaba, then tried Spectrum. Had a terrible experience with early Spectrum and their changes and not working system. When to Hitec Aurora and never looked back. What a great tranny!

Thread: Irvine 40 running problems
15/02/2014 23:51:48

Could it be your clunck is stuck up front in a corner. That prevides enough fuel to start and run for a bit, then she quits. Common problem if you had a hard landing, tip over sort of thing.

Good luck in finding your problem. Its got to be fuel related.

Thread: glow starters
15/02/2014 23:45:48

I use a Sub C cell, 1700 milliampere hour rating glow stick. I dislike the power cord arrangement from a power panel. I am an old safety geek and worry about power cords getting into the prop. Once the engine is running, I go around and take the glow stick off the engine from the rear well away from the prop. I have a handy dandy charger that I use to keep the battery charged. It lasts for several days out flying with no problem.

But it is up to you and your choice. Good luck.

Thread: My new Turboheader Muffler Saito FA 100
28/12/2013 18:32:29

You should also expect a few more hundred RPMs in the smaller engines. I have one on my Saito .65 and it works great for me. We as usual do not seem to have the noise issues that you do but as said, it does have a more pleasant sound to it.

Thread: Running in new engine.
21/12/2013 19:26:42

It is common practice to break in (or as you may say run in) ABC/ABN engines in the air here in the States. Run slightly rich, not overly so. These designs need to heat up so that the cylinder walls expand slightly. The piston rides on a film of oil. The engines also have a "pinch" at the top (top dead center). I have a Thunder Tiger Pro .46 that is so slick inside that the wind blows the prop back and forth while it is sitting on the run stand. Yet it has plenty pinch and runs with great abandon.

Ringed engines do require a rich beginning. ABC/ABN do not need to excessively rich at the onset like ringed engines. And the engines run faster in the air than on the bench. So run in the air is the way to go.

Thread: SC Engines
21/12/2013 19:18:46

I use two Magnum four stroke engines and have no problems. Maggies are just SC/ASP engines marketed in the US. I;ve not had a two stroke Maggie yet. Other engines are readily available used and thus do not waste money on getting new stuff when so much used is sort of just laying around for the taking.

Thread: os four stroke
21/12/2013 19:14:55

Fully agree with oiling the rockers after a lay up. I use any oil available and make sure some of it dribbles down the push rod tubes to the cam followers. It is a pre lube so to speak.

The engines are designed to expel excess oil, so extra oil will do fine for storage but will some will be expelled during running. The crankshaft beats the oil to a fine mist that travels through the engine providing lubrication. And unless you open the engine case up and drain the oil, some is always retained in the sump. I am not saying you should go to the extreme of removing the back case and draining, just pointing out that oil is there.

Thread: How do you react when you break a model?
13/11/2013 19:06:10

As an old military accident investigator, our service went to all cause determinations. There is no single primary cause of accidents, there are usually multiple causes, and if one can interrupt the sequence of causes, one can stop the accident from occurring.

So, yes most of our crashes are our fault, whether it be a bad batter, bad connection or dumb thumbs, it is still our fault. One should learn from the event and try not to repeat the sequence of events, ergo prevent future crashes. Unfortunately, we like to fly and thus expose our selves to those errors of judgment that lead to crashes.

So take heart, keep flying and always analyze the cause and attempt to prevent it from occurring again. But by all means, keep flying. That is after all the objective.

Thread: Mr B goes IC, again
07/11/2013 17:24:59

Saito's take a long time to run in (break in). Once they are well run in the idle is pretty low, bear to 2,000 RPM=, maybe 2,300 RPM.. One test to see if the needles are set correctly is a snap from idle to WOT. The engine acceleration should be quick and clean, no stumbles. The low speed needle actually controls the fuel to the engine from idle to well into the mid range of the engine. So the low speed adjustment is a key element to the acceleration from idle to maximum RPM.

If the engine stumbles on acceleration, then it is likely to rich on the low needle (in the throttle arm). The engine comes set with the needle flush with the throttle arm and that is a rich spot. You will find that you will have to turn the needle in to lean it out. Do this in very small increments. Of course, the high speed needle needs always to be set first as it controls total fuel into the engine. So always set the high speed needle first and use a TACH to do this, Very few people have hearing good enough to judge four stroke engines. Set the high speed about 300 to 400 RPM rich from the maximum RPM setting. The go about adjusting the idle needle.

Again, the best test I have found is the acceleration test. If there is no hesitation on acceleration, you are set correctly.

Thread: saito engine help
07/11/2013 17:06:50

RE: fuel consumption. Your high speed needle setting is very rich. I find the normal to be around 1.5 to 2.0 turns out. A velocity stack will improve it marginally as the stack tends to collect the fuel that is tossed out the manifold by pressure spikes. The Golden Knight version of the Saito usually comes with the stack installed. If you get one do remember that an 0-ring is required to be installed between the stack and the carb or it is totally useless.

You will also find the factory setting for the idle to be rich. Go to the linked web page there is a lot of material on the engines. But once you have broken in (er, run in) the engine, it will be a lot more economical to run. And the idle RPM will also be quite nice, a good slow tick over.

Thread: .91 4 Stroke problem
04/11/2013 22:01:02

I agree, the engine man was very wooly. These are ringed engines and need a good interior coating to ensure long life. Ergo, always add some Castor to the mix and you will never regret it provided, of course, there is no wooly engine man around.

Thread: Saito FA 125 Help!!
08/09/2013 17:14:43

Saito's need a couple of gallons through them before they begin to idle well. They will tick over very smoothly when well run in. Nothing wrong with 15% Nitro fuel, even 20% works but so is 10% Nitro.

The idle fuel flow rate is dependent upon the High Speed Needle setting. I would run the engine rich for at least a gallon of fuel through it. The factory setting for the idle needle is flush with the throttle arm. After a gallon or so through it use a TACH and set the high speed needle for max RPM and then back it off 300 RPM on the rich side. That is where you are going to fly it. Then set the idle needle. Do so in 1/8th turns with the engine stopped. To dangerous to do so when the engine is running. I find the best method for getting the idle right is the acceleration test. When the engine accelerates smartly from idle to max without hesitation, you have it spot on.

It is not a bad idea to use a tie wrap as described above. The Intake Manifold is held in place by the carb. The interface wtih the cylinder is just an O-ring. Saito's sometimes have very strong power pulses that can make the interface bounce, ergo the use of the tie wrap. As the engine ages this becomes less of a problem as it begins to be a really smooth operator.

But it takes a bit of running to get there. After several gallons of fuel through the engine you will fiind it is a great piece of machinery.

Also read the Saito web page. It is found at **LINK** There is a great deal of information on the egines posted.

Thread: Throttle setting
03/09/2013 19:22:13

I do the same but often make adjustments using End Point Adjustment on the tranny for fine tuning. I try to set up where idle is dead even on the trim. I use trim to shut down even though I have a tranny and can program it to do the job. Just my way, the old way, the way I learned.

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