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Post by thunderkat59 on May 2, 2015 20:49:09 GMT -5
With synthetic oil. Do you let it idle at looong lights or turn it off and restart it?
Just curious. Makes me nervous to let it idle for 4-5 minutes . . .
Thanks !
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Post by Elektrey on May 2, 2015 21:18:31 GMT -5
I think you are overestimating the time of stop lights.
I premix so the engine is getting oil when its at idle whereas an oil pump might not supply oil at idle (not sure though because I think some use the crankshaft to pump oil).
In any case I wouldn't be too worried because I don't think enough heat is generated to do any damage at idle.
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Post by 90GTVert on May 2, 2015 21:31:17 GMT -5
Idling doesn't worry me at all. I'm a pre-mixer, but with a Minarelli oil pump it shouldn't be an issue. I think it's mostly a problem with some of the chain drive scoots that have the pump driven off of the rear wheel.
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Post by thunderkat59 on May 2, 2015 22:07:14 GMT -5
Thank you, Guys!! I have 2 lights on my commute that are horribly long, combined with the fact that if people dont roll out, you get stuck for a second cycle  My Eton is on Kicker-only duty until I figure out some electrical gremlins that have plagued it for while. Not fun to kick start at long lights . . . This is a relief to know.  |
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Post by Sitticuss on May 3, 2015 6:42:11 GMT -5
It's a 2T not a 4T so no worries...
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Post by scooterpimp on May 3, 2015 8:03:34 GMT -5
Anything i blew up was @ w.o.t. never lost a scoot eng idling.  |
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Post by humanshield on May 3, 2015 10:59:52 GMT -5
I dont have a 2 stroke scooter at the moment....but I work on them...but I do have quite a few 2 stroke bikes.
I wouldn't worry about it too much.
If you still do, get one of those laser thermometers and check the temp of the exhaust outlet immediately after coming to a stop from a reasonably long ride....then pull off the road and let it idle for a few minutes, checking the same spot a few times. If the cylinder temps rise a lot so will the exhaust temp. It will rise somewhat.
You can get a general idea how much this way.
I think 400F is not too alarming on a 2 stroke and 500F is about as high as you want to see it get under any circumstance. If you get temps over that at idle...then worry.
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Post by 90GTVert on May 3, 2015 11:07:38 GMT -5
I'm used to monitoring CHT so mine will eventually cool to below 200F at idle. Cruising to WOT is usually 260-340F or more so idle temps are of no concern to me.
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Post by humanshield on May 3, 2015 11:24:46 GMT -5
I'm used to monitoring CHT so mine will eventually cool to below 200F at idle. Cruising to WOT is usually 260-340F or more so idle temps are of no concern to me. Says the man who has more sensors and monitors on his scooter than a nuclear submarine  I still wanna do that AF setup like you have.....but it's hard for me to justify the expense right now. Still hard to believe you melted that piston with all that monitoring going on. |
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Post by Fox on May 3, 2015 11:31:03 GMT -5
At idle the fan is spinning and blowing air across the cylinder and head so it's cool... no pun intended.
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Post by humanshield on May 3, 2015 12:03:17 GMT -5
At idle the fan is spinning and blowing air across the cylinder and head so it's cool... no pun intended. That makes a LOT of difference imo. And...that's a scooter thing. Not one of my 2 stroke bikes ranging from 125 - 400cc's have any cooling fans at all. Just fins exposed to air. I suspect a carefully ducted and adequately finned 2 stroke scooter wouldnt need the shrouds and cooling fan either.... resulting in a gain in performance since it does take some effort to spin that fan and move that air. On the other hand, that fan ensures cooler temps especially at idle I would think. |
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Post by niz76 on May 3, 2015 12:52:20 GMT -5
I've read somewhere that a LC setup can be up to 2 h.p. more mainly because of the difference of the strain on the engine turning a cooling fan vs. a little water impellar. Faster revving too!
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Post by humanshield on May 3, 2015 13:37:18 GMT -5
I've read somewhere that a LC setup can be up to 2 h.p. more mainly because of the difference of the strain on the engine turning a cooling fan vs. a little water impellar. Faster revving too! wow. Didnt think it could be THAT much. It's hard to visualize how much pressure that little fan has to work against ......unless you take it OFF the scooter and spin it at 6-7000 rpm. THEN you'll feel it. |
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Post by aeroxbud on May 3, 2015 14:55:27 GMT -5
I've read somewhere that a LC setup can be up to 2 h.p. more mainly because of the difference of the strain on the engine turning a cooling fan vs. a little water impellar. Faster revving too! I had seen a dyno printout of the difference once, was very noticeable difference in power. |
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Post by aeroxbud on May 3, 2015 14:59:16 GMT -5
I think you have to remember that these scooters are really made for use in the city. So stop start use in traffic will not be a problem  |
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