原文出处：http://www.rcuniverse.com/forum/ ... ial-engines-15.html
感谢hyl 大大！
---------------------------------------------------------------------------------------------------
OK, weather abated for a day, and I was able to put to the test all the (long..?!?) theory above. With good results, I am happy to say.
Set-up:
1. SP-2 plug on top cylinder (smaller gap) and Rcexl plugs on the bottom cylinders (larger gaps to avoid fouling). Made sure plug caps were 100% securely seated on all plugs to rule-out misfiring from that source.
顶上的气缸用SP－2火花塞，底下两缸用Rcexl 火花塞，充分燃烧防止积油；确保火花塞帽紧固防止不点火。。。
2. Changed Klotz Techniplate to Castrol Power 1 oil to avoid carbon build-up in No.1 and the huge oily mess from the exhaust evident in previous runs.
用嘉实多power1润滑油代替Klotz Techniplate润滑油，防止积炭和废气油污过多
3. Changed oil ratio from 15:1 to 20:1 to improve combustion and avoid plug fouling.
润滑油比例从15:1调到20:1，提升燃烧防止火花塞积油
4. High needles started @ 4 turns out and low needle @ 8 turns out (previous set-up from rich WOT running)
高速油针开4圈，低速油针开8圈
5.Prop is still an APC 22x10.
APC22X10的桨
Observations:
1. Leaning the test stand ~20-35 degrees to either side at low to mid throttle does has an effect on cylinder temps when the engine is still rich; cylinder closer to the bottom will load-up and its temp will fall (misfires due to plug fouling most probably).
根据测试标准，发动机富油时，油门从低速至中速时，会对气缸温度有20-35度变化的影响，靠近底部的气缸温度会降低（大部分是火花塞积油导致的缺火）
2. Low needle is dominant and the engine should be tuned by that - not the high. The high is relatively insensitive in most of the throttle travel and only affects maybe the top 5% of the throttle curve. The effect of the needle on the engine takes several seconds to take hold (i.e. requires a slow tuning reaction/decision).
发动机表现主要依赖低速油针而不是高速油针，高速油针大概只影响油门曲线顶部的5%
3. Cylinder temps will balance only when the fuel mixture is close to optimum (i.e. leaned-out). Chance misfires/fouling will occur if engine is anywhere near rich.
气缸温度平衡仅在油料配比最合适的时候出现，富油就会出现积油缺火
4. After running the engine @ WOT for at least 2 minutes, with optimum mixture, cylinder temps will be balanced within less than 10% deviation at all subsequent throttle settings, including idle.
发动机使用最佳配比燃油运行2分钟后，在任意油门下气缸温度会平衡至10%以内
5. The only safe way to lean-out the engine (i.e. tune the low) is by observing temperatures near the peak rpm at 50-75% throttle; there is a "peak" regime where the rpm does not change much but temps will! Why this? Because a good state of tune basically matches cylinder behavior in terms of "misfires" (= non-explosions); for example, on one case, one of the cylinders may have many more misfires (= colder) than another (= hotter) while on another case, both cylinders will have an equal amount of misfire events and thus run at the same temps. However, in both cases, theaverage power output of the engine (rpm) will be the same...! A further indication of optimum tune is the absence of observation #1 above - little change in cylinder behavior while leaning the stand left or right with respect to horizontal.
调试时唯一安全的方法是观察50-75%油门时接近峰值转速下的温度，峰值转速的意思是转速变化不大但温度变化很大，因为发动机调整好状态基本上等于调整气缸缺火，比如一缸比另一缸缺火多很多，或者两缸缺火差不多，都可能导致同样的功率和转速输出，最佳调整的进一步标记是观察在倾斜底部水平两缸时，顶部汽缸温度表现几乎无变化。
6. After tuning the engine just so, there will be no misfires (plug fouling) at any throttle setting, no hesitation in transition. About 6,700rpm is achievable with a 22x10.
调好后，22X10将可以到6700转
Video(sorry for the quality and the stills - the camcorder also ran out of batt in the end...):
Based on my experience up to now, I would conclude that:
- The wider-gapped Rcexl plugs are perfect for this engine - avoid the small-gapped SP-2s, at least on the bottom cylinders
Rcexl宽型火花塞比较好，不要用SP－2s火花塞，至少底部两气缸别用。
- Rotating the engine during initial rich running-in helps out tremendously. After lean-out, it is not really needed.
转动发动机
- The Castrol Oil gives out much less residue and seems to inhibit plug fouling. Also, the 20:1 ratio gives a better burn and less chance of fouling.
- The engine requires a good warm-up before achieving a perfect tune. The intake parts where the fuel is atomised and distributed need the temperature to atomise the fuel - the result will be even cylinder temps. Any rich running will cool the intake and will allow loading-up/richening and/or plug fouling of the bottom cylinders at different engine orientations. This is risky for flight. So, its good practice to run the engine @ WOT on the ground for 1-2 minutes. From idle to WOT, I found that it takes at least 30sec for cylinder temperatures to peak. The WOT running will heat-up the crankcase/inlet chamber to help good fuel gasification thereafter. Possibly also blow-out any residues from the plugs.
调整前最好充分热车。。。
- The real trick is to tune the low by temperatures and not rpm. The high just needs to be open enough to provide enough fuel to the low. It is for this reason (mistake) that the top cylinder was a temperature runaway in the first runs (tuned the high first).
调整时最好跟踪温度而不是转速，高速油针只需要尽量打开给低俗油针供油，一开始就调高速油针往往导致磨合时顶缸温度失控。
----------------------------------------------
按照这个说法：风门最大以富油使转速保持在5000左右开始磨车的方式对于60R3来说，可能就会使某气缸缺少，也就不能用这种方法来磨车了？
|
樓主: ae66
