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engine prob
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18-06-2007 11:20am#1
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Nitrocruiser has the "trouble free" CEN engine. One of my favourite engines IMHO. I have worked on very many of the 12s and they are as sweet as a nut. Until CEN brought out their 16 size which runs hotter.NitroCruiser wrote:.... I have never had trouble with WD40 with my CEN .12 engine in my GX1....
The CEN 16s and later models run hot. They often seize during "running-in" by beginners. I myself have personally unseized over 20 of the CEN 16s (where un-seizing was possible) for their owners.
We saw plenty of them, including many that we at greenhobbymodel had not sold, because other shops customers whose CEN car seized the 2nd/3rd time, would talk with other CEN owners who got it from Green Hobby but who never had that problem. Then they would find their way to us looking for a "cure".
A careful fuel choice for running-in was the key to the newer CEN.
5% nitro fuel produced a situation that was curable with external heat, some force, and lubrication.
16% nitro fuel produced a much harder seize. Maybe half could be freed out, and they had to be run-in again, to eliminate the tight spot produced by the seize.
So the best fuels for the CEN 16 were Model Technics GX-5 for sport use and GX-10 for performance use, with GX-16 for competition, but at a cost in lifespan. The oils in MT GX blend are very tolerant of extreme heat.
A few were so tight that we would test pull it in the shop, say "wow" to ourselves, and reach for the "CEN-Special" running-in fuel blend we had made up at the time. (Model Technics ingredients:2% nitro ,22% oil, 76% methanol). This fuel avoided the problem on even the tightest CEN engine until after they loosened up.
The CEN TR4 (and later) model tendency to run a tad hot was significant in why Green Hobby & Model in Dublin switched their no 1 brand from CEN to CARSON cars 3 years ago. As far as I know, the car magazine reviewers neglected to mention this even though they must all have been aware of it during testing. No surprise there!
After the run-in was completed there was no difficulty and the engine "tames down" nicely.
Running hot is no problem for an experienced modeller, cooler glowplugs, less nitro, more oil, and a richer setting is required. Many performance engine will run hotter. But beginners can't cope and often get a seize through not having enough expertise. It has come up on these boards before a couple of times.
BTW
He never answered ZOcatviaN ... is the piston going up and down?
Is it actually seized? A broken conrod is another reason why the piston will appear to jam.
What nitro was it on? How hard a seize?
If it's seized hard - expert help will be required, as using brute force will probably damage other parts inside the engine.
Soaking in WD40 might help a "soft-seize" . After 2 days soak, re-lube with pariffin using a toothbrush, then try rotating the knurled flywheel with medium force (no more than that!). Too much force will break your conrod.
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