Awesome New Diesel Head Conversion
#26
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Awesome New Diesel Head Conversion
I have a Davis Deisel head for my OS .61FSR. I have not run the conversion basically for lack of knowledge about operating this engine with the head. I also have the OS .61FSR GS-A2 geared engine. Does anyone have experience with the FSR deisel conversion? Some pros and cons would be appreciated.
#27
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Diesel
Rob the fuel consumption of a model Diesel is considerably better than a glow engine, I've seen claims here of 20 minutes from an 8 oz. tank. You prop them down to the 8,000 to 8,500 rpm range with the throttle about 80% open. I use a 16 oz. tank to run Diesels in a test stand and rarely fill it above 2/3 and can run most engines over 40 minutes. The compression adjustment is used to adjust the compression for starting a cold engine, lowering it to start a hot engine, different prop loads, large props less compression and small props higher compression, and to a small degree adjust the European style Diesel for ambient temperature changes. The Davis conversions rarely need adjustment after the initial setup unless you change props or there is a dramatic change in the ambient temperature. They run on a mixture of kerosene, ether, and ignition enhancer, and lube, castor mostly. As for longevity, I can only say that my most run Diesel, a SuperTigre .51 conversion is still going strong after being a US Aircore Knight Hawk and Colt 40 my second and third trainers and a Kombat Kopter. It still turns a 12x6 three blade in the 8,800 rpm range.
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Awesome New Diesel Head Conversion
This info written by Ed Carlson will give you a good idea of how to begin and what to expect. He also sells a lot of diesels.
http://www.carlsonengineimports.com/...eselinfo.shtml
Max
http://www.carlsonengineimports.com/...eselinfo.shtml
Max
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Diesel conversion results
Robby & aquilajohn,
Check out my post @
http://www.rcuniverse.com/showthread...21&forumid=245
Oily in Germantown
Franciss
Check out my post @
http://www.rcuniverse.com/showthread...21&forumid=245
Oily in Germantown
Franciss
#30
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RE: Diesel conversion results
I re-ran the TT .42 with the Teo head using Davis Oily Mix and a Graupner 12x5 getting 11,490 rpm with compression screw set midway of it's travel and the airbleed screw halfway across the hole. For some reason the RedMax was not the right fuel for this engine. The idle was much better with the Davis fuel at about 2,100 and the top rpm was rock steady in 35 degree weather.
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RE: Diesel conversion results
Has anyone come across a large bore head for a 2.18 MDS? I would be interested in converting a large one for use on a 120 stinger or 25% Edge.
#32
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RE: Awesome New Diesel Head Conversion
It happens that I am (and have been, since 1948 AD, and the Deezil "A") a bona-fide Diesel nut case.
I have TWO brand new Mecoa .46s (same as your LEO .46) and only one Davis head between them. I would be very pleased to acquire one of your heads, would you please contact me regarding price and shipping.
I am : Morton H. Muntner
502 West Sandra Terrace
Phoenix, AZ 85023
email: [email protected]
Anticipating your affirmative reply, I had better start breaking in these two little jewels on Glow-plug. TODAY!
Best regards,
Morty.
I have TWO brand new Mecoa .46s (same as your LEO .46) and only one Davis head between them. I would be very pleased to acquire one of your heads, would you please contact me regarding price and shipping.
I am : Morton H. Muntner
502 West Sandra Terrace
Phoenix, AZ 85023
email: [email protected]
Anticipating your affirmative reply, I had better start breaking in these two little jewels on Glow-plug. TODAY!
Best regards,
Morty.
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RE: Diesel smoke
ORIGINAL: hobbsy
I've got a TT .42 GP coming, my first Taiwan engine, some Diesel concentrate from RedMax to mix with some BioDiesel that I bought over a year ago and a RMTeo head to try. The concentrate is 65% ether, 30% castor and 5% ignition enhancer, I believe mixing a quart of this with two quarts of the bio fuel will make a fuel of about 20% ether, 10% lube and 1.5% enhancer. I actually got the bio to fire a few times in my Fox .74 conversion without anything added but had the compression maxed out. It smelled like Pam getting hot in a skillet and made a visible puff of smoke. If someone would like to refine my percentages, go for it. The bio has plenty of lubricity of its own, hence the 10% lube. Any thoughts welcome. I am going to order some Davis concentrate also, in the interest of science. Talk to me.
I've got a TT .42 GP coming, my first Taiwan engine, some Diesel concentrate from RedMax to mix with some BioDiesel that I bought over a year ago and a RMTeo head to try. The concentrate is 65% ether, 30% castor and 5% ignition enhancer, I believe mixing a quart of this with two quarts of the bio fuel will make a fuel of about 20% ether, 10% lube and 1.5% enhancer. I actually got the bio to fire a few times in my Fox .74 conversion without anything added but had the compression maxed out. It smelled like Pam getting hot in a skillet and made a visible puff of smoke. If someone would like to refine my percentages, go for it. The bio has plenty of lubricity of its own, hence the 10% lube. Any thoughts welcome. I am going to order some Davis concentrate also, in the interest of science. Talk to me.
Whoever told you that a sport engine would run well or even survive for very long on the ratio you mentioned must have been thinking that you wanted to fly in FAI team racing.
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RE: RE: Diesel conversion results
That is plenty of oil when used with soybean oil. And it appeared to be too much ether because I couldn't get the compression low enough for the bio mix. However it ran great with Davis oily mix and RedMax Plain bearing fuel. I don't think you read my post close enough.
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RE: Diesel smoke
ORIGINAL: hobbsy
I've got a TT .42 GP coming, my first Taiwan engine, some Diesel concentrate from RedMax to mix with some BioDiesel that I bought over a year ago and a RMTeo head to try. The concentrate is 65% ether, 30% castor and 5% ignition enhancer, I believe mixing a quart of this with two quarts of the bio fuel will make a fuel of about 20% ether, 10% lube and 1.5% enhancer. I actually got the bio to fire a few times in my Fox .74 conversion without anything added but had the compression maxed out. It smelled like Pam getting hot in a skillet and made a visible puff of smoke. If someone would like to refine my percentages, go for it. The bio has plenty of lubricity of its own, hence the 10% lube. Any thoughts welcome. I am going to order some Davis concentrate also, in the interest of science. Talk to me.
I've got a TT .42 GP coming, my first Taiwan engine, some Diesel concentrate from RedMax to mix with some BioDiesel that I bought over a year ago and a RMTeo head to try. The concentrate is 65% ether, 30% castor and 5% ignition enhancer, I believe mixing a quart of this with two quarts of the bio fuel will make a fuel of about 20% ether, 10% lube and 1.5% enhancer. I actually got the bio to fire a few times in my Fox .74 conversion without anything added but had the compression maxed out. It smelled like Pam getting hot in a skillet and made a visible puff of smoke. If someone would like to refine my percentages, go for it. The bio has plenty of lubricity of its own, hence the 10% lube. Any thoughts welcome. I am going to order some Davis concentrate also, in the interest of science. Talk to me.
I know that I'm sticking my neck out and practically appearing to beg for another (however mild) insult, but here goes anyhow...
Just based on the usual practice of using about 30%+ ether content, don't you suppose that...
Omigawd, I think he's gonna hit me again! ...
Mort.