Saito FG 60 R3 vibration problem
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- Опубліковано 6 лис 2024
- I'm probably already tired of everyone with this Saito FG 60 R3 engine, well, for myself, that's for sure. Unfortunately, the vibration level of the spark ignition engine does not make it possible to say that everything is fine with the engine and that it can be put on the model. If you put it in this form, the model will fall apart at the first start. That is, there is a problem, and it must be solved.
Since engine vibrations are significant only on spark ignition, references to a stupid conversion to glow fuel do not apply.
The problem is timing, that's for sure, but what exactly?
I decided to shoot a short cycle of engine starts, each time changing the position of the Hall sensor, towards a later ignition.
Maybe one of you can tell me something, how to solve such a problem ? Thank you so much, and have a great day!
I'm also wondering if the compression ratio has been changed on these gas engines over the methanol designed ones. And with the methanol fuel being such a violent, fast burning fuel, it is exaggerating the power pulses mechanical engineering design floor already mentioned. Hello from New Zealand and I'm looking forward to learning along side you with this project
Thank you very much for your comments ! I'm very pleased by this words. Regarding compression ratio - you're totally right, FG engines utilizing higher compression level, than dedicated for glow fuel. But...there also should be some "but" :-), I know some Saito engines (FA 150B, or FA 200Ti), which shows unusual for glow fuel engines compression ratios, 11,24:1 and 13,68:1 accordingly. Also, with glow plugs Saito FG 60 R3 runs noticeably smoother, in comparison with spark ignition (on both fuels, on petrol and methanol). Here you can check, what was the difference:
Petrol fuel + spark ignition: ua-cam.com/video/fmytl0Ea4I8/v-deo.html
Petrol fuel + glow ignition (OS G5 glow plugs): ua-cam.com/video/vSZEcs6MHCg/v-deo.html
Some of my subscribers have approved reason, of what was wrong. To be short - the problem is in an engine design flaw. I should also check this (it will take some time).
Thank you for watching CrazyEngines, and have a nice day !
@@crazyengines88 all good my friend, I did read the comment on the master conrod being manufactured incorrectly. I as a engineer myself, "mechanical, and Fitter/welder" found this to be very helpful, and I can believe they allowed that to slip through without proper modelling. CAD is so very useful 😉😂. Thoroughly enjoy you video's. Hopefully this translates okay
@@russcole5685 Thank you very much for your comment ! It is very important for me to know your opinion, and quite often I get very good advice in the comments. I have already found the main reason for the vibrations of the engine, this is really a designer's mistake, and by the way, it is far from the only one. There are also claims to the distributor of the fuel mixture, due to the uneven distribution of it among the cylinders. Okay, let's leave it on the conscience of engineers and Saito's managers. Most importantly, I know how to remove vibrations. As soon as I get a modified ring with magnets, I will definitely make a video with this "medicine".
Have a great day and thanks for being you!
Nice video. The timing issue is not about the sensor position. All saito FG radial engine has seriously wrong conrod design. The No.1 cylinder always good timing for ignition and valves. But No.2 cylinder are too much early on all. No.3 cylinder is too much late. Open the back cover of the crankcase. And turn the crankshaft from the No.1 cylinder TDC to next 120 degrees, you will find out the problem.
Thank you very much for your comment ! Your information is quite important, thank you ! As far as I understood, it was the engine design problem, so to correct this, should be some serious mechanical "surgery" provided. Should be some "cure", this engine was quite popular and sells in thousands.
Thank you !
@@crazyengines88 I did a lot of test to fix this problem on my engine, 2 different ways.
1. I put all magnets out from the hub, and install only 1 magnet, then I put 3 sensors on the engine, and each sensor connect to 1 single ignition. I can move each sensor position to the correct position and match every cylinder TDC. Second step is reset cylinder 2 and 3 valve timing. very important is follow the real TDC to check the gear position, not by the screw on the hub and not by the conrod pin. After that, you will get so much better performance. The fire order will not exactly 240 degrees. But each cylinder working on correct condition.
2. This is the perfect way, redesign and rebuild a new conrod.
@@YangGuici Thank you very much for your interesting and informative comment ! Definitely, there is a lot of work, but most important, that this problem could be resolved . Great and thank you so much !
I'm sorry my suggestions weren't helped mate. I like what the next commenter mentioned about Saito engins and their timing
Don't even worry about...most important, that somebody knows, what is the reason. The rest we can resolve 😃
For me it looks normal, my single cylinder Saito FA-100 also vibrates on low RPM.
Thank you very much got your comment ! Yes, of course, all the engines are the source of vibrations. I also own Saito FA 100 single cylinder engine, it's simply great, runs very smooth ! Its vibration level is non comparable with Saito FG 60 R3. In case of Saito FG 60 R3, vibration level is very high, because both cylinders, #2 and #3, due to its wrong timing, increasing vibrations to inacceptable level. I have to eliminate this "side" effect. Thank you and have a nice day !
You need a hub with correctly timed magnets. Order from CH Ignitions or MMM.
BUT...
If you want the engine to run perfect you also need a mod of the intake manifold (back cover).
Make sure to run it with a lot of oil, that is the way to save the connecting rod bushing.
Here is my FA170 with MMM ignition, but I am still not 100% happy cause it hesitates at about 5000--6000 RPM
I would love to know how the modified back cover looks like. ua-cam.com/video/Un_UOODawyI/v-deo.html
Thank you very much for your comment ! New hub with correcting magnets was already ordered today from CH Ignitions 🙂 I have to check, how new hub will affect vibrations. Regarding intake manifold - will investigate video, which you shared with me.
Thank you very much !
Spark plug misfire??
Hmm... I don't think so, checked several times. As some informative people here say's, that it is engine design flaw and necessary to rebuild an engine , to solve the problem. I'm collecting now all opinions and advices, it's really could help !
Thank you and have a nice day !