Crankshaft is located nice and deep in the belows of the engine. So when trying to get inthe ballpark of tdc offset, we had a ripped apart motor that was just enough to see and calculate.
But also yes, harley has dual fire plugs.
mk e. you keep saying im off, dyno says i'm not. You said curve would be flat up top, as you saw, its not.
mk e. you keep saying im off, dyno says i'm not. You said curve would be flat up top, as you saw, its not.
I would have to dig up the original words, but I recall it looked exactly as expected, all lopsided due to leakage. The pressure curve would never be flat, it will start to drop as soon as leakage rate exceeds pressure gain rate. So a pressure rise and peak is expected ...2-5 degrees or so before true top, depending on how well sealed the rings are. I think what I probably tried to explain is that there is virtually no piston movement in the center 5 degrees and almost none in the center 10 so even a dial indicator is a very inaccurate way to find TDC in that area and standard practice is to stop .100" or so down in one direction and reverse to .100 the other direction and set center in the middle.
I have no idea how the dyno is telling you its correct? You could tell the ECU TDC is almost anywhere and still tune it just fine on the dyno so I'm not sure how that tells you anything? But this also means it doesn't really matter unless you're trying to share tuning tables with somebody who set TDC differently, but it you use you're setup and you tables you have no problem at all.
Crankshaft is located nice and deep in the belows of the engine. So when trying to get inthe ballpark of tdc offset, we had a ripped apart motor that was just enough to see and calculate.
But also yes, harley has dual fire plugs.
mk e. you keep saying im off, dyno & oem ecu says i'm not. You said curve would be flat up top, as you saw, its not.
mk e. you keep saying im off, dyno & oem ecu says i'm not.
If you already had the number from the OEM ECU why did you not just use it and save all the time and bother of trying to measure it?
I'm sure a pressure sensor in the plug during cranking is WAY better than guessing ......
Again, because I don't. OEM ecu (well tmax in this case) does not show tdc offset. It does however show what timing it runs. Considering we did a few baseline runs, we know how much whp to expect out of it. So translation. Cylinder pressure tool did its job properly, I am dead on with timing, you said won't work, it worked. Thank you. Have a lovely day.
OR we could just get back on topic of cylinder pressure sensor. Reason why I did it has near nothing to do with why we want it.
Again, because I don't. OEM ecu (well tmax in this case) does not show tdc offset. It does however show what timing it runs. Considering we did a few baseline runs, we know how much whp to expect out of it. So translation. Cylinder pressure tool did its job properly, I am dead on with timing, you said won't work, it worked. Thank you. Have a lovely day.
OR we could just get back on topic of cylinder pressure sensor. Reason why I did it has near nothing to do with why we want it.
Reporting you got the same (similar?) hp for 1 tune as another tune, then implying that means the crank position setting is dead on is a non sequitur.
Mischaracterizing my comments about a method being inherently inaccurate to mean "won't work" is dishonest.
https://bdn-automotive.com/products/pressure-sensors has a nice comparison of different approaches and they seem to be ready to take my money for Mazda Skyactive-X M8 thread, and 160mm length sensor I wonder what's the part number
Mark: NGK
Model: LMDR10AJS
Candle for engines 4 time
Overall length: 80 mm
Thread length: 27 mm
Thread diameter: 10 mm
With olive / non-removable core
Mark: NGK
Model: LMAR8F9
Candle for engines 4 time
Overall length: 83 mm
Thread length: 26,5 mm
Thread diameter: 10 mm
With olive / non-removable core
For 14 mm spanner
CR glow plug pinout:
1. power (3v if I'm reading this bentley notations correctly)
2. signal to ecu
3. ground
4. glow from J179 automatic glow time control module
Well, the cylinder was firing and we've measured _something_ with proper period. While signal shape looks nice there is a bit of a concurn for scale and base line volgate. To be continued in NJ.