[S62i]

Motor :4T Magnum30XL ( adica 5cmc).
Probleme:
1.Deschiderea valvei cilindrice a carburatorului se poate realiza cam pe 60% din cursa spre max ,in afara acestei pozitii motorul oprindu-se.Reglajul din jiclerul de amestec nu face decat sa urce sau sa coboare spre maxim ( cam 8000 ture/min) aceasta plaja de accelerare ,in detrimentul opririi spre zero ( cam sub 2500ture/min).Motorul este nou si si-a facut cam o ora de rodaj cu alcool+20%ulei natural,cam 0.8-0.9 l consumati
2.Compresia relativ mica in raport cu un 2T pana la ora actuala.
3.Gama de turatie practica intre 2500 si 8000 ture/min,cu o elice cu 3 pale 10x7.O sa icerc si o elice 2 pale 9x6.Din recomandarea fabricantului dupa un gallon de alcool consumat se considera rodat.

Credeti ca aceste disfunctionalitati se vor rezolva de la sine odata cu incheierea rodajului,adica dupa cei 3,78 l alcool consumati?

Date de catalog:

Displacement.............................................5.0cc (.30cu.in.)
Bore............................................................................
19.7mm
Stroke..........................................................................
16.4mm
Practical R.P.M.................................................2,200 - 13,000
Weight (w/Muffler)....................................................9.6oz.
Crankshaft Thread Size...............................................1/4 - 28
Propeller Size Recommendations

9 x 5
9 x 8
10 x 6
9 x 6
10 x 4
11 x 3
9 x 7
10 x 5
11 x 4
Combustibil:
For the break-in
period you must use a fuel containing no more than 10% nitromethane and
no less than 20% Castor Oil lubricant. Use of fuel containing more than
the recommended percentage of nitromethane or any synthetic lubricants
will cause the engine to run too hot and result in excessive wear and engine
failure in a very short period of time. Once the engine has been adequately
broken-in (about 1 gallon of the recommended break-in fuel), a fuel containing
up to, but no more than 15% nitromethane and no less than 16%
Castor Oil and synthetic lubricant blended fuel can be used.
Note: We do not recommend using fuels that contain only synthetic
lubricants. Synthetic lubricants have a much lower flash point than Castor
Oil lubricants. Flash point is the point at which the lubricant begins to
actually burn and loses it¡¯s lubricating qualities. Using fuels containing a
blend of Castor Oil and synthetic lubricants results in an engine that runs
cooler and lasts longer. One lean run using a fuel containing only synthetic
lubricants can cause engine failure. Using fuels with a Castor Oil
and synthetic blend of lubricants greatly reduces this chance.

[Marinaru]

...referitor la compresie, motoarele 4T sun mai lesinate decat cele in 2T!!! (deci nu trebuie sa te sperie, e OK asa cum e...)
La motoarele in 4T, in amestec cu combustibilul iti trebuie cel putin 5% nitro...probabil din lipsa acestuia pierzi relantiul!!
Referitor la combustibil, e bine ca la motoarele 4T sa amesteci si ulei sintetic cu cel de ricin...ricinul simplu are prostul obicei sa ancraseze supapele!...

Aceasta postare a fost editata de Marinaru: 09 September 2003 - 07:42 AM

[PiccoMaster]

Marinaru zice bine, 4t au compresie mica ! Deci stai fara grija.
2. Turatie mai mare de 8-9000 nu au. Variatiile sunt in functie de elice.
3. Ca sa nu se opreasca la ralanti 4t au bujia alimentata cu curent.