|
Post by spaz12 on Sept 9, 2015 23:22:56 GMT -5
The problem I see is that when adding the wire and not using the same gauge, you changed the resistance between the thermoresistor and the computer. Ask derbiman what happens when you do this. I like the idea though
|
|
|
CHT?
Sept 10, 2015 6:24:13 GMT -5
Post by derbiman on Sept 10, 2015 6:24:13 GMT -5
Spaz is right. I got some very inaccurate readings because I used a slightly (very slightly!!!) larger gauge wire.
|
|
|
CHT?
Sept 10, 2015 6:52:00 GMT -5
via mobile
spaz12 likes this
Post by tsimi on Sept 10, 2015 6:52:00 GMT -5
Before connecting the gauge to the scooter i did some testing like checking my body temperature like you would check for fever and it was maybe 1-2 degrees off. Then i compared it with my room temperature gauge here at home and it was same maybe 1-2 degrees off. If there is an inaccurate reading then because of the sensor placement. I will try to get a 14mm spark plug sensor washer and will resolder the wires that way maybe i can get the same or better reading. Either way it is an interesting alternative if everything is correctly wired and setup.
|
|
|
CHT?
Sept 10, 2015 13:17:27 GMT -5
tsimi likes this
Post by spaz12 on Sept 10, 2015 13:17:27 GMT -5
Heck, just a couple degrees difference should be fine. I was thinking that there would be a much bigger discrepancy.
|
|
|
Post by derbiman on Sept 10, 2015 15:08:44 GMT -5
I bought a cooking thermometer a while back at Walmart to experiment with but I got sidetracked and it is sitting on the workbench. I paid like $10 for it. This thread has peaked my interest a little. I may have to work on it when I get some spare time.
|
|
|
CHT?
Sept 10, 2015 18:17:51 GMT -5
via mobile
spaz12 likes this
Post by tsimi on Sept 10, 2015 18:17:51 GMT -5
Heck, just a couple degrees difference should be fine. I was thinking that there would be a much bigger discrepancy. Yeah, surprisingly it is more accurate then i thought it would be. I used 0.5 or 0.3 wires. Those are the thinnest that i had around. I just wish i had a better way of connecting the sensor to the cylinder head to make absolutely sure that it reads correctly.
|
|
|
CHT?
Sept 10, 2015 19:53:57 GMT -5
Post by derbiman on Sept 10, 2015 19:53:57 GMT -5
Can you solder a 14mm ring terminal to the end of the probe? Not sure if the cooling fins will allow you to do it though.
|
|
Deleted
Deleted Member
Posts: 0
|
CHT?
Sept 10, 2015 21:03:29 GMT -5
Post by Deleted on Sept 10, 2015 21:03:29 GMT -5
I bought a cooking thermometer a while back at Walmart to experiment with but I got sidetracked and it is sitting on the workbench. I paid like $10 for it. This thread has peaked my interest a little. I may have to work on it when I get some spare time. I have used those in several experiments a while back. If it is the simple type with the round dial and needle indicator (analog) then you can calibrate them easily. I found that mine, since I was going to be using it near 200 degrees F, was off a bit when placed in boiling water. (212 F) So, I turned the dial to line up with 212. But, when I checked it at near freezing temps, it again was off. For our purposes, I would think that calibrating it using boiling water would be fine. If the one you have is digital, then, I don't know anything about it. Bill
|
|
|
CHT?
Sept 10, 2015 21:04:54 GMT -5
spaz12 likes this
Post by tsimi on Sept 10, 2015 21:04:54 GMT -5
derbimanThis Japanese dude did that. check hereHe first modified a bolt to fit inside the sensor ring. Then added some thermal grease for better temperature transfer. Then used some kinda glue to keep the wires in there and then wrapped the whole thing with some black vinyl tape. And he got some reading so I guess it would be possible. To get a reading between the spark plug and cylinder head (as most CHT do) is sure more accurate then what i did by just sticking it between the fins.
|
|
|
CHT?
Sept 10, 2015 21:12:15 GMT -5
Post by tsimi on Sept 10, 2015 21:12:15 GMT -5
I don't think analog types work at least you cannot extend it with wires and connect it to the head. They use a different type of heat measuring. Some sort of spiral spring is inside that expands or shrinks with the temperature.
|
|
Deleted
Deleted Member
Posts: 0
|
CHT?
Sept 10, 2015 21:13:21 GMT -5
spaz12 likes this
Post by Deleted on Sept 10, 2015 21:13:21 GMT -5
derbimanThis Japanese dude did that. check hereHe first modified a bolt to fit inside the sensor ring. Then added some thermal grease for better temperature transfer. Then used some kinda glue to keep the wires in there and then wrapped the whole thing with some black vinyl tape. And he got some reading so I guess it would be possible. To get a reading between the spark plug and cylinder head (as most CHT do) is sure more accurate then what i did by just sticking it between the fins. Wow, that was a neat modification. I am afraid his readings might be off as that is only reading 132 F, unless he just started it up. I may be wrong but don't our scoots have cht's of over 200?...like maybe 250+? Nice mod though either way. Even if way off...(if it is, I don't know) it could be used for comparison purposes. Like if 132 is "normal" for him and suddenly one day he sees 180...he knows something is wrong. As long as it is consistent. Bill
|
|
|
CHT?
Sept 10, 2015 21:16:18 GMT -5
Post by tsimi on Sept 10, 2015 21:16:18 GMT -5
that reading was after just starting the engine. He said that after a bit of idling it went up to 80-90C (176F-194F)
As soon I get my china display I will be able to compare the two and then I can tell more.
|
|
Deleted
Deleted Member
Posts: 0
|
CHT?
Sept 10, 2015 21:19:54 GMT -5
tsimi likes this
Post by Deleted on Sept 10, 2015 21:19:54 GMT -5
Ah, OK, that makes sense. I was having trouble reading his text. Actually, I could not read any of it, ha ha.
Bill
|
|
|
CHT?
Sept 10, 2015 21:38:38 GMT -5
via mobile
spaz12 likes this
Post by tsimi on Sept 10, 2015 21:38:38 GMT -5
What? You can't read Japanese? Hehehe...
|
|
Deleted
Deleted Member
Posts: 0
|
CHT?
Sept 10, 2015 21:52:52 GMT -5
Post by Deleted on Sept 10, 2015 21:52:52 GMT -5
What? You can't read Japanese? Hehehe... Oh sure, I can read Japanese....I just don't know what it says...ha ha. Bill
|
|