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RE: DDD heads destroying engines? - 6/20/2009 9:07 AM   
Bill Adair



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Status: offline 		I'm using a Monoject syringe now, after the seal in a larger syringe failed. The Monojects that I have use cup seals, and I've no idea what they are made of. 

 
Lou,

You may be right about larger props needing less compression. 

I was able to check the crank on one of my McCoy diesels, by pulling the back cover, and shining a light into the crank bore. It appears to be the older version, with the square corners on the intake port. I'll check the other one, when I pull it off the mount.

Never had a problem with the one I had as a kid, probably because I knew how to use the compression lever, and only ran the milder (equal parts) fuel mix, with no Cetane booster.

Bill

< Message edited by Bill Adair -- 6/20/2009 9:08 AM >

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RE: DDD heads destroying engines? - 6/20/2009 4:15 PM   
AMB


 

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Status: offline 		Ok folks justing surfing looking for info on Enya Diesels> It appears Modelflight Downunder has them as not available. It appears they have dropped a lot of stuff; I then looked at Steve Webbs site in the UK and they have them NOW the conversions of glow to diesel surfaces. This is a quote from the engine description (also 129GBP

quote:


What a gem of an engine,Based on the hard wearing and proven EnyaSS15. This ball raced diesel features a vary good carb and terrific throttle range for an RC diesel
Being a diesel very small quantities of fuel are used and a much larger prop than a normal size 15 can bw used
It is evident this follows with any modern glow conversion that Davis makes heads for will run well and hold up fine martin


< Message edited by AMB -- 6/20/2009 4:23 PM >

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RE: DDD heads destroying engines? - 6/20/2009 9:29 PM   
AMB


 

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quote:

ORIGINAL: AMB

Ok folks justing surfing looking for info on Enya Diesels> It appears Modelflight Downunder has them as not available. It appears they have dropped a lot of stuff; I then looked at Steve Webbs site in the UK and they have them NOW the conversions of glow to diesel surfaces. This is a quote from the engine description (also 129GBP

quote:


What a gem of an engine,Based on the hard wearing and proven EnyaSS15. This ball raced diesel features a vary good carb and terrific throttle range for an RC diesel
Being a diesel very small quantities of fuel are used and a much larger prop than a normal size 15 can be used (end of quote)
It is evident this follows with any modern glow conversion that Davis makes heads for will run well and hold up fine martin




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RE: DDD heads destroying engines? - 6/20/2009 9:37 PM   
Mavi91


 

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Status: offline 		I managed to bend a rod on a Norvel .061 conversion some years ago when I was first starting out.  I did that out of ignorance, attempting to start the engine the same way I started it as a glow engine:  sloppy wet.  My guess is that this is the largest source of problems with diesel conversions.

A number of people have recommended ways to start a diesel, and the Davis Diesel advice is a good method to follow.  This is especially important for small engines as it is very easy to damage them with improper starting procedures.   Davis heads have been around for a long time and have a good track record, so I suspect that most failures are as a result of misadjustment of the engine.

As far as overcompression damage effects go, the problems with the ball and socket rod on Cox engines have been pretty well known for a long time.  Other conversions seem to work out ok for people who take the trouble to learn how to run them.  I have 2 conversion diesels, one of which I run for a number of flights every time I go flyingand I fly a lot.  After 5 years of  heavy running, I can say that I've never had an engine failure.  I would observe, however, that there is a learning curve to getting a diesel to run right.  But, once you've gotten the hang of it, it's a piece of cake.




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RE: DDD heads destroying engines? - 6/21/2009 1:59 AM   
ddd


 

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Status: offline 		Your comments on ether loss are very interesting and correct in theory however in practice it doesn't work out that way,. for example most of our customers for the last 34 years run 40 to .90 and larger diesel systems so they consume fuel at a good clip. Those that have little 1/2A to 10's use our quart size cans of fuel.  All the cans have solvent seals and when tighened lose nothing.  We formulate with extra ether knowing there will be loss over time in use.  Remember we have adjustable compression to deal with this variation.  We tell the consumer to decant to quarts and take those to the field, afterall whay drag a gallon when a quart will give you around 100 minutes of running.  Many years ago a modeler gave me a partly full quart of OK diesel fuel which was very old and just for grins I put it in a Cox diesel and it ran just fine maybe a littler hotter but not much.  Although most modelers on this site talk about small diesel, larger ones are the more common in use in R/C.. Modelers running diesel today consume more of our fuel in one year then in all the years of diesel in the past combined. 

< Message edited by ddd -- 6/21/2009 2:02 AM >

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RE: DDD heads destroying engines? - 6/21/2009 11:30 PM   
lildiesel



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quote:

ORIGINAL: Bill Adair

I'm using a Monoject syringe now, after the seal in a larger syringe failed. The Monojects that I have use cup seals, and I've no idea what they are made of.
Bill


I wasn't very clear when I posted about Monojects last night. I put the Viton 0-ring over the black plunger tip and it fills the groove that makes the seal with the cylinder. The black tip never really fails, it just loses good sealing with use and won't draw well.

< Message edited by lildiesel -- 6/21/2009 11:38 PM >

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RE: DDD heads destroying engines? - 6/22/2009 9:36 PM   
Hobbsy



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Status: offline 		I have about 25 engines converted to Diesel operation from an OS LA .10 to a SuperTigre 4500 and with about 9 of them being .50 sized engines. So far in 19 years I have never broken any parts. In most cases the flipping effort seems lower than it was on glow operation, most consume about one half the fuel as did the glow version. Few, (if any), purpose built Diesels have the power of the conversions.

A typical conversion is my Fox .74 ABC, it turns a Graupner 12x8 at 11,200 rpm on glow and a Graupner 12x8 three blade at 9,500 converted.

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RE: DDD heads destroying engines? - 6/23/2009 6:21 AM   
w8ye



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Status: offline 		Hobbsy has been over to my house a couple times. Once in the hot summer with a Irvine diesel and the second time was early April and he had a diesel conversion that time. Cannot remember the engine but the plane was a LT-40. The temperature was around freezing.. He started it right up. Took a little while to stabilize though

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RE: DDD heads destroying engines? - 6/23/2009 1:15 PM   
Hobbsy



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Status: offline 		Hey Willy, what engine, what prop, what fuel, how about a picture, when you make a claim like that you should back it up. Here is a K&B 1.00 happily turning a 15x8 three blade at 9,000 rpm.

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