I bet the same guy designed Shogun Warriors!Dr_Strangelove (whew!) wrote: ↑Fri Jan 11, 2019 12:13 pm Timely and Topical - a nice combination.
https://jalopnik.com/mugen-has-made-the ... 1831677108
What device decides a cylinder is miss firing...
- B3DAWG
- OG (First 100 Outposters!)
- Posts: 1659
- Joined: Sun Jan 07, 2018 11:46 am
- Location: Gawga DAWG Country
Re: What device decides a cylinder is miss firing...
- 32wildbilly
- Never gonna run around and desert you
- Posts: 5782
- Joined: Sat Jan 06, 2018 2:46 pm
- Location: Kneebraska
Re: What device decides a cylinder is miss firing...
Why is the worse culprit usually #6?b3freak wrote: ↑Thu Jan 10, 2019 7:24 am Cracked coil packs. I'm in the same boat. My car has the original coil packs and with all the wet weather, I'm getting random misfires too. Not trying to push the hysteria, but you may want to bore scope cylinder #6. Just to see the health of the motor. Cylinder #6 is the devil!
Never gonna make you cry...
- B3DAWG
- OG (First 100 Outposters!)
- Posts: 1659
- Joined: Sun Jan 07, 2018 11:46 am
- Location: Gawga DAWG Country
Re: What device decides a cylinder is miss firing...
I'm just basing it on the many reports from owners on the forums that describe that the problem(s) (e.g. scoring) usually reside within Cylinder #6. I believe Jake Raby said on (the other forum) that he is planning to do a new video on the topic of bore scoring for his YouTube "Rennvision" channel. Apparently, problems associated with scoring on M96/M97 engines have increased as our motors age. If it ain't one thing it's another!32wildbilly wrote: ↑Tue Jan 15, 2019 7:03 amWhy is the worse culprit usually #6?b3freak wrote: ↑Thu Jan 10, 2019 7:24 am Cracked coil packs. I'm in the same boat. My car has the original coil packs and with all the wet weather, I'm getting random misfires too. Not trying to push the hysteria, but you may want to bore scope cylinder #6. Just to see the health of the motor. Cylinder #6 is the devil!
Re: What device decides a cylinder is miss firing...
I don't recall the specifics, but I remember Jake wrote up a detailed explanation of it. Something about the side it is on, it's position, and how oiling works as I recall.32wildbilly wrote: ↑Tue Jan 15, 2019 7:03 amWhy is the worse culprit usually #6?b3freak wrote: ↑Thu Jan 10, 2019 7:24 am Cracked coil packs. I'm in the same boat. My car has the original coil packs and with all the wet weather, I'm getting random misfires too. Not trying to push the hysteria, but you may want to bore scope cylinder #6. Just to see the health of the motor. Cylinder #6 is the devil!
- B3DAWG
- OG (First 100 Outposters!)
- Posts: 1659
- Joined: Sun Jan 07, 2018 11:46 am
- Location: Gawga DAWG Country
Re: What device decides a cylinder is miss firing...
Don't quote me, but I also think the heat/cold cycles play a factor. In other words, the pistons expand faster than the cylinder bore. You add extremely tight clearances and then you have scrubbing. After the piston begins to scrub on the cylinder wall, the iron skirt coating begins to flake off making the piston even more abrasive to the bore thus causing the deep scores. Tick Tick Tick BOOOOOOOOOM!
Re: What device decides a cylinder is miss firing...
Yeah that's the gist of the scoring itself, but Jake had details about why #6 is the worst of the bunch.b3freak wrote: ↑Tue Jan 15, 2019 9:09 amDon't quote me, but I also think the heat/cold cycles play a factor. In other words, the pistons expand faster than the cylinder bore. You add extremely tight clearances and then you have scrubbing. After the piston begins to scrub on the cylinder wall, the iron skirt coating begins to flake off making the piston even more abrasive to the bore thus causing the deep scores. Tick Tick Tick BOOOOOOOOOM!
- B3DAWG
- OG (First 100 Outposters!)
- Posts: 1659
- Joined: Sun Jan 07, 2018 11:46 am
- Location: Gawga DAWG Country
Re: What device decides a cylinder is miss firing...
yea, guess we'll have to wait for his new videos on the subject unless you know of the link that you're referring to. Thanks!gnat wrote: ↑Tue Jan 15, 2019 9:22 amYeah that's the gist of the scoring itself, but Jake had details about why #6 is the worst of the bunch.b3freak wrote: ↑Tue Jan 15, 2019 9:09 am
Don't quote me, but I also think the heat/cold cycles play a factor. In other words, the pistons expand faster than the cylinder bore. You add extremely tight clearances and then you have scrubbing. After the piston begins to scrub on the cylinder wall, the iron skirt coating begins to flake off making the piston even more abrasive to the bore thus causing the deep scores. Tick Tick Tick BOOOOOOOOOM!
Re: What device decides a cylinder is miss firing...
Hmmm.. A curated l lists of all his posts where he shared gory details of the m96 could be a very nice thing...
Re: What device decides a cylinder is miss firing...
To answer the original question of what device decides a cylinder is misfiring, the answer is the crankshaft position sensor. A misfire will slow down the pulses the crank sensor looks at. Since there is a missing tooth on cylinder 1 to tell the CKP where TDC is for cylinder one, it can determine from where the pulse is slowed down which cylinder is misfiring, unless there is more than one cylinder misfiring in which case the ECM will throw a P0300 random misfire code.
Re: What device decides a cylinder is miss firing...
The crankshaft position sensor is the main indicator of a mechanical miss fire [loss of compression,etc] .It picks it up when the crankshaft slows down due to the miss fire .This is how it can indicate the cylinder thats miss firing also. For elect miss fires the ECM reads exhaust sensors,fuel trim,fuel pressure to indicate a miss fire .