Ok guys yes cold (well cool in Florida) took a good look at my VMAR bird dog ARF last night , really pretty nice laser cut quaility good, although designed for electric power it states on the box 06 thru 12 glow power, they use a ply mount base that either glow or electic can be mounted on and then bolts to the firewall with 4 bolts in a stand-off setup the firewall has a large cutout in the middle. Playing "mock-up" it turns out the little MVVS 09 will mount at about 220 degrees (cylinder about 8 oclock which puts the muffler in the plane with room to spare and it then can be piped to the outside this would allow a nice cowl in (it actually is in the battery area) and still plenty of room for the tank over it
of course a ply plate over it to keep heat from the tank. wt 130 gm - OS 10 wt 160gm ASP 12 194 gm (all wts with muffler) using the Os 10 or ASP 12 would have the engine sideways or up right and work but would not look that great (also all engines have diesel heads). the only thing to be done to the MVS would be a metric cap screw to replace the t bar thing since it would strike the cowl and not allow adjustment the OS or ASP do need the OS manifold extens OS part 21125108 to clear the cowl in any mount angle (I have it)
there is no such aninal for the MVVS 09 and an arc is cut into it so it mates with cylinder held on with a U bolt understand these are pretty scarce now

extra ply plate to hack in the box for motor install

also got the OS part # 21125502 is a 2pc adaptor the allows the installation of the muffler 90 degrees from horizonal thus can be straight up or down it will fit the ASP 12 15 and of course the OS10 never know might have a use sometime the whole thing with shipping was about $25 from tower ( muffler ext too) it has no application for the bird dog martin

fuel formulas came in the box with the MVVS09 ether 45% Kero 30% Castor 25% (sport use) racing ether 30% kero 42% Castor 25% amyl nit 3% 0r ether 30% kero 43% Castor 12%
parafin oil WHATS THAT??) AMYL NIT 3% I USE DAViS 1/2 a MIX AND ITS RUNS FINE

Dieseldan
paraffin oil should (or could) be oil mist (white oil) that is... johnson oil. Look at http://environmentalchemistry.com/yo...Pediaflor.html
Ugo

Hmm I took a look at my manual for the MVVS 1.5 and it certainly does mention 10% parafin oil for racing mixes. It's basically a mineral oil used in place of castor oil. I'm surprised that the racing mixes use it.

I bet Davis 1/2A mix is close to the 45% ether mix, but with something like 33% oil.

Greg, the purpose of substituting part of the castor with paraffin oil is to reduce the viscosity of the lube wthout reducing its percentage in the mix. A very old trick, indeed. Furthermore, paraffin oil is cheap, cleans well the engine and does not leave any residual, a sort of synthetic ante litteram. This mix remembers past times, so I will add to the thread.
Ugo

The MVVs mix is still 24% oil then-- 12% castor 12% parafin oil (mineral oil) that is an interesting combo
This really a nice engine too bad no longer made, with their carb better transitions than my PAWs it may be a little lighter than the PAW also?? since my PAW in a plane could not weigh but the sharma is 143 Gm with the paw muffler
must be close martin

Ugo that goes against your entire dilution theory. MVVS is actually recommending reduced viscosity, with less ether. Certainly a less costly mix was not the goal in racing. And the potential for damage when leaning out as much as possible is higher. By your theory they could get the same lower viscosity result with better protection by simply using less castor oil, no?

greg and merugo , my guess is lowering the oil % may cause some damage being these are plain bearing engines
maybe not enough oil film?? to protect rod ends and bushed bearings. I do think heat carry off with the diesel is an issue 24 -25% oil may be pretty protective its still lube oil plain castor or a mix martin

Greg, introducing paraffin oil in place of some castor reduces the viscosity in a controlled and limited way , reducing ether by substituting it with kerosene leads to an uncontrolled reduction of viscosity. This reduction can be dramatic since the paraffin oil is about a sae 15-20, while kerosene is sae 1.
What I am searching to imagine is what is the physical dynamics of the fuel droplets in their travel from carburator jet to the head. It could be interesting to prelevate some sample of the liquid phase in the crankase (two strokes I mean). There we should find the oil-kerosene mix that wets the conrods and the crankshaft. But, how this mix is a true mix? Over a certain percentage of kerosene the two components within the droplets should separate. Forces within a droplet are particularly high, so the oil could be embedded within a mantle of kerosene.. This could mean that inside the crankase we we have no more a solution, but a particular dispersion of (castor I mean) oil in kerosene, allowing for an adequate lubrification. The castor could stick to internal surfaces better than kerosene. This could explain why mineral oil behaves worse than castor in diesels... and this could be an argument against olive oil, that mantains kerosene in solution more easily than castor.
Ugo

Ugo, do you have any text book references? I read plenty, but don't know where to find this information.

If you read Klotz's datasheets some oils are listed as dissolving and some as staying in suspension, but it seems to be inconsistent to me but there may be an underlying answer.

It has been said that the amount of heat the the oil can actually "carry off" is insignificant. Consider the amount of oil and the total heat, and this comes to light. I thought there were posts fairly recently inthe diesel forum saying that increased oil doesn't result in lower operating temperatures and in some cases higher temperatures were observed.

Martin, I made a header for my MVVS .09 many years back. It was a simple part made of bent and soldered brass tubing and steel plate. Two screws through the plate threaded into a piece of nyrod tightened it against the cylinder. I used an o-ring in between to seal it. I can't find it today, probably sold it with the engine years ago. I have another 1.5D now.

GREG geat idea think enough scrap pieces hanging around and can silver solder it together thx martin
nice you got an other 1.5

The exhaust temps are low so you don't even have to hassle with silver solder. I can make a sketch for you if you like.

Greg please do save me some time thx martin, nost likely some other 1.5 owners would like to see too martin

It will be tomorow as it's getting to bed time now.

Greg,
of course oil warming does not keep any significant quantity of heath per se, but some oil circulation happens, also in two strokes. This could lead to some reallocation of the heath from warmer to cooler parts. How much this reallocation is efficient I do not imagine, since it has to be assessed. As for mixing and not mixing oils, remember not to refer to cases involving gasoline or methanol. There the problem could be limited to efficiently and stably mixing the components. But, due to their LOW goiling points, in every case they separate almost immediately in the engine, leaving no room for mixes. Diesel is totally a different matter, I guess.
Ugo

I have a PDF of the header available here.[link=http://www.dieselrc.com/images/MVVS_HEADER.pdf]MVVS 1.5D Header[/link]

I can't guarantee the dimensinos will fit the engine with the carb, but that is pretty much what I had on mine.

greg looks good (the header nice solution) simple too martin

Oh dear, Oh dear ! My head hurts !

Here in the UK model diesel fuel contains paraffin as the main energy component.
Kerosene is, as far as I know, not used in the U.K.... not in general use anyway.
It may well be that the aviation industry use kerosene.... householders and model diesel fuel suppliers use paraffin !

Apart from use in model diesel fuel, paraffin has been used in oil lamps (thank heavens for electricity) and also in portable room heaters.

Paraffin is also good for cleaning automobile engine components when stripping down an engine.

I (knowing no better) always thought that paraffin and kerosene were virtually the same thing but with different names !

I would NOT dream of relying on paraffin as a lubricant in any sort of engine... yes it may well have some lubricating qualities... I would confine it's use as a lubricant to helping a drill bit cut or some similar purpose.

Castor oil will not disperse into paraffin unless ether is present. The amount of ether determines the amount of castor oil that can be added. Low temperature makes the problem worse. I found that using 25% castor oil needed a minimum of 15% ether content in the fuel, otherwise the castor oil starts "dropping out" of the mix.

Paraffin as the lubricant, or chosen for it's lubricant qualities in an engine ? No way, never!
What slight lubrication properties it has may well help in the final fuel mix. I would think that paraffin's main advantage is it's very low viscosity.

I have seen Americans refer to paraffin as "lamp oil", I guess that is their equivalent.

Straight diesel oil from the garage pump has more viscosity and lubricity than paraffin.

Reg

Now I have a headache. Kerosene and paraffin as it is called in the UK are one and the same. Paraffin oil is something else altogether. Wikipedia just told me that kerosene is indeed called paraffin oil in the UK.

The reference here in the MVVS manual however is very clear in that is lists paraffin(kerosene) and paraffin oil as two separate ingredients inthe fuel mix.

Greg,
My own experience indicates that paraffin (also known as paraffin oil) is the same as kerosene and lamp oil.

I know of no seperate substance that is called paraffin oil.

The viscosity of paraffin oil is 1.... which is exactly the same viscosity as kerosene.

Ugo quotes an sae of 15 - 20 for paraffin oil and an sae of 1 for kerosene..... something is wrong here.

Having done a quick check online I found all references to paraffin oil were in fact refering to the paraffin oil which is the equivalent of kerosene.

I wonder.... is there an "up cock" in the MVVS instructions or, are they refering to something which is NOT generally known by the name of paraffin oil ???

Reg

A quick google search I did on 2/18 definitely showed that paraffin oil was indeed what Ugo says it is, a heavy petroluem distilate. The most common synonym is Nojul.

http://www.jtbaker.com/msds/englishhtml/p0143.htm
http://www.chemistrystore.com/mineral_oil.htm

Reg,
mineral oil derivates have infinite name variants in different countries. Be sure, vhen mvvs substitutes the "paraffin" oil for castor it means a mineral oil derivative that is a low viscosity lubricant-detergent. This practice was used many years ago. in order to reduce the viscosity of castor, particularly in cold climates, or for giving engine higher speed due to the reduced viscosity of the lube, without reducing the lube percentage. In those times none was thinking about synthetics . This oil has a high boiling point and a high purity, it has the lowest sulphur and aromatics of all mineral derived oils since it is heavily hydrothreated. Its most known use is as the almost total ingredient in baby oils. Do you think really someone wetting babies with kerosene?
Ugo

Greg,
Thanks for the web sites. I use google.co.uk and it was probably throwing up all the websites that are relevant to what is COMMONLY known as paraffin oil here.

There is all the makings of confusion here.... someone in the UK could read the MVVS instructions and then go and buy some paraffin oil to mix with the fuel as per the instructions. This would NOT be a good thing as what we would be adding is different to what MVVS intended.

Ugo,
The local mothers are going to be just as unimpressed when I tell them that they have been swabbing their children down with parrafin oil !

To virtually everyone in the UK paraffin oil would be the paraffin that is just the same as kerosene.

If it is indeed the main/sole ingredient in baby oils then the safety precautions shown at the website http://www.jtbaker.com/msds/englishhtml/p0143.htm look a bit alarming !

Reg

I was going to add in the last post that searching the local google probably wasn't giving the same answers I was seeing.

"Ugo,The local mothers are going to be just as unimpressed when I tell them that they have been swabbing their children down with parrafin oil !"
If true, they seem to know better what is paraffin oil than you, but if you want to make a Solomon proof, find a neighbouring mother, fill a nice bottle of kerosene, with two drops of your after shave, then make this gift, and wait to be called from police!
Baby oil is ENTIRELY made from paraffin oil (NOT KEROSENE), and once paraffin oil was given also as a mild laxative, from mouth.....or from bottom.
If you want to escape jail, after having given your gift, show this http://householdproducts.nlm.nih.gov...ds&id=10001060 and this http://householdproducts.nlm.nih.gov...bl=chem&id=126 to the judge and invoke his clemency due to your misunderstanding. If it will not work, drop two lines here and I will send you a file!
Ugo