clm

My Feedback: (24)

Just had my second MVVS 26 gas engine rod bearing eat the back plate. The rod bearing bulges causing it to rub against the back plate, chafting the aluminum. Aluminum flakes go throughout the engine destroying it.
1st engine I'm told was due to not using fully synthetic oil @ 32:1 ratio.
2nd engine just received in March this year and just finished the second gallon of fuel using Mobile Racing 2T oil at 30:1 ratio.
What caused the second engine to go?
Is this a common problem with the MVVS engines?
Where can I get warranty work done on the second engine?

I really like the MVVS 26 engine until the second gallon of fuel then I just get sick when they eat themselves.

please advise
clm

PS picture shows grove in back plate. If you look closely you can see the rod bearing bulge on the far left side (9 o'clock position) and aluminum shaving eveywhere.

DarZeelon

Curtis,


I have not seen this happen on any MVVS gas engine.
Let's see if Pe can add anything.

Who did you buy this engine from?

ampa

when I dismantled the back plate of my 26 gas I noticed a very small amount of scratches but not enough to send pieces of alluminium inside the engine. Teory says that the volume where the assembly conrod/crankshaft move must be as small as possible to increase the pumping effect so it seems normal to me that the back plate is fitted as close as possible to the conrod and when the engine get hot the dilatation of the crankshaft can make possible a very light "polishing" of the bakplate. Obviously if the the crank shaft is milling in the bakplate something is wrong

cyprusjets

clm

How many Rpm are you running your engines?

clm

My Feedback: (24)

I purchased both engines from PE.
Using a Mejzlik 18-8 prop @ 7900 to 8100 prm with tuned pipe.

Its the bulged bearing that appears to be milling the back plate.

cyprusjets

clm

I have seen once a similar case with one engine long time ago but it was cause of the engine was running in much higher Rpm than the recommended and probably much higher heat, i thing these are the most common factors for this case to occur. And is a bit strange that both of your engines happened to have the same problems, i run run the 26cc lots of times with my dealers and we never had problems with these engines running in normal conditions.
I thing you should contact PE and i am sure he will help you find some answers with your engines.

cyprusjets

Thanks for deleting my posts guys you have right only the manufactures representative is allowed to reply to
questions and i am not one of them, i have just put exclusive sales of Cyprus just for fun [:@]. Its pity, just keep up the good work

pe reivers

Curtis,
I already sent you mail with instructions. Please do send me the information I asked for.

Garikoitz

I had EXACTLY the same problem with my engine one year ago. I phoned the shop where i bougth it (in warranty time) and they told me that i had to SEND IT to "Checoslovaquia" the country where they buid them. I still dont know what to do with that problem. Please if you know how can i repair it send me an e-mail to g_errasti(a)yahoo.es

Thank you very much

Garikoitz.

Sorry for my poor english.

pe reivers

For warranty work, You indeed are best off sending it to the factory directly.
I have sent you a mail with all details for shipping.

Garikoitz

Thanks,

I've just send it to the given address.

Garikoitz

chadderbox

I have had the same problem too. I had to rebuild mine twice now. My oil is mixed corectly with mobil syn.. I e-mailed MVVS and they said it was a cooling issue. I have done every thing I can to this thing with coooling baffles etc.... HELP!!!!!!!!!!

pe reivers

Can you post pictures of your set-up?
The engines I repaired indeed all had cooling issues. (lack of cooling, or prop too large)
The piston coating prevents the engine from sagging, so you get no warning of engine distress until too late.