Saito FG 21 checking internals after 35% NITRO tortures test
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- čas přidán 24. 05. 2023
- Hello, my dear viewers and subscribers !
Previous 2 Saito FG 21 videos were dedicated for finding some kind of the limits, where gasoline engine was fueled with extensive addition of the NITROmethane (from 10 till 35% !) to the standard gasoline fuel mix (20:1 95 Octane gasoline and with the special synth oil). Engine was really fully loaded, showing very high TOP RPM speed, but also, especially with the high NITRO content, becomes very hot, much hotter, that usually. So, I think, that extended amount of NITRO, of course, released additional oxygen, and this also increasing the power, as well, as increasing the temperature in the combustion chamber.
So, engine was seriously tortured during this experimental runs. I'm very interested to dismantle the engine after the runs and to check its internal condition, to check the possible wear. This video, I hope, will answer all the questions about engine's reliability.
Thank you for watching and have a nice day ! - Věda a technologie
Excelent
Thank you very much for your kind comment !
Hi mate,
sorry for the late reply. I didn't expect any damage in there as you could hear how smooth that engine was running. If anything, that bit of nitro will also help clean up the carbon in the long term by cleaning up the fuel burn through more efficient combustion.
My concern was if the timing wasn't correct and if the engine was 'pinging' then there is the chance of damaging the rod and its bearings given the low amount of oil these use. But as you saw everything was good so overall I'm very glad you performed the test as now I'm happy that its not an issue.
Maybe try some nitro in your big 3 cylinder 60cc engine to smooth it up?
Oh, one more thing. Using a little bit of methanol will help nitro mix with gasoline. 1~2% should help. It won't detract from performance.
Thank you very much for your comments ! It's OK. Should say, that when I looks deeper in crankcase, I found, that bearings wasn't in so nice condition, as it looks like at glance. Main bearing shows some crackles, and the prop bearing was too tight (we should take into account that Saito installs both side closed bearing at front). Both were replaced, of course, I have some spare bearings for Saito's FA 120 & 120's, and install it. Regarding FG60 engine, I'm so tired from it, so let's it wait for a while. I've some idea, how to modify it's intake manifold / fuel distributor, but with a lack of time and necessary mechanical tools (need a lathe, at least) it will wait until the better times. And b.t.w., the key FG60 problems are from the conrod's assy and with fuel distribution. So, due to the fact, that ignition correction flange is already installed, the next step - even fuel distribution. Thanks for an advice with a methanol addition. I check, that 30% and over amount of NITRO isn't dissolving well in gasoline mix, the solution becomes cloudy, partly due to water (which is present in nitromethane in small amounts due to its hygroscopicity) but also due to the fact that gasoline has limited miscibility with nitromethane.
Wrote a whole novel, sorry for the many words :-)
Have a nice day and thanks for the kind words!
@@crazyengines88 you are spot on about nitro being hydroscopic. Its my understanding that it's very polar hence the reason for its miscibility in water. The other thing to note is while the little bit of methanol will help nitro to mix in gasoline, a good synthetic model engine oil is usually even better at assisting here. But I know you're already doing that so you're right there.
Till next time
@@aSpyIntheHaus Thank you for you reply ! I've basically, few oil types, of course, Klotz Techniplate, or Rl-198 Lite Techniplate for glow fuels, Klotz Gas Burner for gasoline mixes. I'm not so big fan of Klotz, except the special Klotz scent. Motul Micro 2T oil is one of the best, my preferred oil, according to mine experience, and for gas mixed fuels I prefer Saito recommended oil - Power Model 2T-S (UK made), it's performed very well.
Thank you, and with best regards !
Like new. 😂
Thank you for the comment ! Like new, you're right, but only from the first look. I found today, that both engine's bearings weren't in good condition. Main bearing had some crackling sound, and front bearing was too tight, so not all was so good. Both bearings were replaced for a new one's, from Saito FA 120S engine, I have few spares, and it had the same bearings, as FG21. And after that replacement, really, engines becomes like new 🙂