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Videos of my 40LA diesel - 6/9/2009 6:23 PM   
Patxipt


 

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From: lx, PORTUGAL
Status: offline 		Guys, wanted to share with you 2 videos of my 40LA with a Davis Diesel head. I had to weld a tommy-bar to the allen screw since it's imperial and I don't have any imperial allen keys...

http://www.youtube.com/watch?v=iU0zi2qj5O4

http://www.youtube.com/watch?v=4NPrRBPT1Lk

I can only start the engine with the electric starter and compression at maximum, unlike my PAW diesels. Probably it's just me.

See ya!


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RE: Videos of my 40LA diesel - 6/10/2009 3:04 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		Paxipt nice running engine when first started you had the miss you finally got it into the nice steady diesel hum

you stated it requires the adjustment all the way down as you get more time you will find you can back it out some of mine were this way and as the engine seated in the screw was 1/2 or greater turn out,for running we also do not know the fuel mix or prop size you are using
The compression screw is allen 3/16 head US, not imperial I use an Eklind t handle long shaft driver to adjust my davis heads, the t bar looks and seems to work well
like the color . this shows a good quality engine with a davis head makes one heck of a conversion the LA series shine as conversion and also prove you do not have to spend a bundle of money for a base engine

Good luck get it in the air

martin

AN other 40 engine that shines as conversion and low priced is the ST40 which is a BB and ringed

< Message edited by AMB -- 6/10/2009 3:13 PM >

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RE: Videos of my 40LA diesel - 6/10/2009 5:26 PM   
franchi


 

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From: blain, PA, USA
Status: offline 		     Hi Paxipt:

      I too have been running the same engine with the Davis conversion.  I too had a very difficult time starting it by hand but now I think that i may have learned how to start it by hand.

      I will share my information that I learned.

      Do not prime this engine! Choke only enough to get the fuel to the spray bar! NO MORE

       Start flipping and it will start after about 4 flicks.  If it doesn't start, flip the prop backwards a couple times and then flip forward.
   
       If you flood this engine, very easy to do, I flip hard when the prop is against compression and it may start.  In any case, you will not break the prop on yout chicken stick. Do not use your fingers to flip a flooded diesel this size.

      Back off your compression about 1/2 turn from zero!  If it is not starting with the compression at max, it is flooded and will not start!

     Be very wise when using an electric starter, THINK  and then THINK again.  My engine starts very quickly via an electric starter.

      I have been using a wooden 12-5 or an 11-5 prop on mine thus far and all is well.  I am afraid of "plastic" props!

      I hope that this may help.  If you have any more questions, just ask.


                                                                                                                                                                                                                          Good luck,

                                                                                                                                                                                                                           Franchi

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RE: Videos of my 40LA diesel - 6/10/2009 5:56 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		Davis does suggest a starter with his direction sheet, when you are dealing with a 40 or 50 size engine very slight flooding can cause a big kickback
most of mine I can flip start with a chicken stick, any diesel classics such as PAW or conversions will not start, till cleared of a flooded state ALways turn the prop
before using a starter diesel or glow to make sure no hydrolock martin





< Message edited by AMB -- 6/10/2009 6:01 PM >

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RE: Videos of my 40LA diesel - 6/10/2009 6:56 PM   
Patxipt


 

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Status: offline 		Franchi, thanks for the tips
Martin, thank you also for your comments, it really makes me feel all the trouble yesterday was worth it

I have this head for some months, maybe half a year, but due to not having the allen  key, I ended up never putting it to use until yesterday.
I batlled to get it started, took me over 5 minutes of fiddling, unflooding, etc. When I was ready to get that head out and put the glow head back on, it fired after a final try - intimidation works!

The compression screw is set from around 1/2 to 1 1/2 turn out of max compression (I don't have the engine at hand), but it still needs full compression to start. It takes quite a while to heat up and stabilize, until that, as you could see, it acts as undercompressed.

As a note, when I first started it around 5 months ago, I had to hand flick it because I didn't have a battery to use the starter. I could only get it to hand start without the muffler .

Oh, fuel is Davis bushed engine mix (lost the fuel formula sheet and instructions), I had made one liter of it back then and have had it stored in a metal can since then - it still smells nice and fresh

I'll be having a trip to England for a few days in the near future and was considering getting an engine or two there. From what I remember, there are some ST conversions of you guys; I was thinking of buying a G51/G61 (ringed) or another Irvine 46 MK4 (a wee-bit cheaper in England) to mess with. I'd like to try my hands at a ringed 2-stroke (don't have any ringed one on my collection), but an ABC is more tolerant to over-heating (happened on the first runs of my 40LA diesel, before I figured out it was the compression)... One of the ST it is, variety is good!




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RE: Videos of my 40LA diesel - 6/10/2009 7:01 PM   
Patxipt


 

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From: lx, PORTUGAL
Status: offline 		Just a PS: I was almost kicked out of the house by my Mom, she hates the diesel smell - too bad glow smells better or is almost odourless, I don't see her complaining about the castor smell and the toxic fumes emanated from glow fuel being burnt on an engine Lucky me too, I get to run my glow engines at least


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RE: Videos of my 40LA diesel - 6/10/2009 9:49 PM   
AMB


 

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Status: offline 		Patxipt go for the ST the Irvine Mark IV is now OS made the REd MRK III was made in the UK and Davis made heads for them. I think OS took a few liberties and changed the bore and stroke quite likely the Davis heads will not fit the new ones

On a ringed engine you do not have the seal at hand flipping speed, not an issue with a starter due to the high spin speed after a few hours of running you will have thr ring well lapped in and most likely will hand start
On a new Davis conversion use a starter you wil get an instant light off after some time on the engine hand flips will start them
I also noted you had no muffler on the first trys these carbs are designed for tank pressure to run right As memory serves me on the ST 51,61 one is ringed one is ABC it makes no difference for the conversion, Also an ABC will turn a few more revs than ring at top end but really no issue you have all the torque and power you need with the conversion. martin

Hook up the pressure line you will get a better transition noticed no used on the video

yOU ARE ON THE MONEY ON THE CARB ENGINE RUNNING VERY CLEAN


< Message edited by AMB -- 6/10/2009 10:18 PM >

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RE: Videos of my 40LA diesel - 6/10/2009 10:06 PM   
Patxipt


 

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From: lx, PORTUGAL
Status: offline 		Yes, Martin, I was using no muffler pressure on the fuel tank.
Another option I have is a J'EN 57 engine, as it is ringed and I have good relations with JE; also, I'd like to make my own conversion, this time a proper one.
Do you happen to know if Bob is very busy with the conversions and other work?



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RE: Videos of my 40LA diesel - 6/10/2009 10:56 PM   
AMB


 

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Status: offline 		Davis is very much up and running he managed to get heads made and out the door during the transition ( move to Tenn) I think the fax line is up and current phone number address etc on the site, He will still have heads from 049 and up
with many of the engines he made heads for out of production it does not make a lot of sense to have them just sitting on the shelf
However if he made it in the past and they can be made on an "on order basis" in most cases thus custom made it may take 4 weeks for these
current popular engines OS 40,46 LA, and quite sure others and the STs I understand will have be current stock for "out the door if questions
fax or call him martin

his email still MPDDD@aol.com">DMPDDD@aol.com

I CANNOT FIX THE EMAIL ADDRESS I ENTERED IT WRONG USE THE SECOND HALF THAT STARTS WITH DMPDDD



< Message edited by AMB -- 6/10/2009 11:32 PM >

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RE: Videos of my 40LA diesel - 6/11/2009 1:43 PM   
Patxipt


 

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Status: offline 		Thanks for the info Martin. I asked you that due to a 3 month period of waiting for my diesel head last September from DDD.

I ran the engine again today, one with the same prop - after a prime bursted into life with the starter, and another with a Graupner 3-blade 11x7.
Yesterday's settings were 2 1/2 turns out on HSN and 1/2 turn out on the compression screw. Today the settings remained roughly the same.
On the 3-bladed prop, the compression was out 1 full turn, but HSN was leaned to 1 1/4 turns.
The airbleed screw is turned all the way out (all the way in seemed not to matter also). What would you advise for the erratic idle I have on the engine?

http://www.youtube.com/watch?v=FeC3Nop3cMQ

http://www.youtube.com/watch?v=o8Drj40h8gM


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RE: Videos of my 40LA diesel - 6/11/2009 4:40 PM   
AMB


 

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Status: offline 		First hook up the pressure line from the exhaust. put the air bleed half way, if that does not do it open the high speed needle 1/4 to1/2 turn
compression screw in maybe 1/4 turn if engine sounds hard back off compression martin

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RE: Videos of my 40LA diesel - 6/11/2009 5:30 PM   
Mr Cox



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Status: offline 		Try with some ignition improver in the fuel, if you don't already have it....

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RE: Videos of my 40LA diesel - 6/11/2009 10:19 PM   
AMB


 

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Status: offline 		Patxipt this may help as stated move the air bleed screw half way across get the engine running and set carb to full throttle now adjust the compression for best running running hard compression too high back it off till that nice normal hum if the typical diesel miss turn in adjustment
till it just stops use the pressure line to the carb now slow the engine if it slows and stops too lean open needle 1/4 to 1/2 turn now check your transition if it bogs and stutters maybe a little rich turn in the needle you are now very close a slight adjustment of your high speed needle
and compression screw will get you a good balance for low to high speed also timing is affected by the prop higher prop loads (bigger prop more pitch) advances to timing just back off the compression a lighter prop load retards it engine will miss increase compression once set with the same prop you will not have to be constantly resetting the compression, on a cold start you may have to be in a 1/2 turn when its up to temp put it back
with an electric starter this may not be needed this procedure does vary from the PAW instructions but a PAW it is not martin

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RE: Videos of my 40LA diesel - 6/12/2009 10:38 PM   
Patxipt


 

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Status: offline 		Martin, I dropped by the hobby shop this afternoon and they had an Irvine 46 MK4. For the cheap price, I could'nt help it and bought the little fella. Have already e-mailed Bob regarding the diesel head.
The 46MK4 is, from what I have seen over the net, a 46FX with a rounded case/head; same dimensions, bore, stroke, etc.
The owner of the hobby shop (a renouned modeller, Mr. Julio Isidro) told me they've been selling like hotcakes!
He also gave me some IPN, so I can now make a proper batch of fuel for testing (for now).


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RE: Videos of my 40LA diesel - 6/13/2009 2:10 AM   
fiery


 

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Status: offline 		IPN is good stuff for diesels ... remember it from years ago when I lived in the UK.

1.5% to 2% should be adequate, more tens to lead to trouble.

I use Octyl Nitrate (Amsoil diesel cetane booster) as an anti-knock additive, as I can't get IPN where I am.

As for Amyl Nitrate, well  



< Message edited by fiery -- 6/13/2009 2:21 AM >

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RE: Videos of my 40LA diesel - 7/14/2009 10:46 AM   
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Status: offline 		Wanted to give some news regarding the 40 diesel.

A couple of weekends ago at a modelling exhibition in Lisbon, I got to test my 40LA with a new brew I'd made, consisting of 35% ether, 25% semi-synth ELF 2-stroke motorcycle engine oil, 39% kerosene and 1% IPN.

The engine ran good on this mix, plenty of authority on a 11x6 APC prop, the oil was plenty for the engine with no signs of dark combustion residue whatsoever and actually a thicker consistency than castor oil on the way out of the exhaust ; exhaust smell was nicer too, a big bonus!

See ya!

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RE: Videos of my 40LA diesel - 7/15/2009 4:57 AM   
ddd


 

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Status: offline 		You have not opened the carb enough please set from 1/8 to 1/4 open to start. As for electric versus fingers, fingers are more important to preserve.

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RE: Videos of my 40LA diesel - 7/15/2009 6:45 PM   
Patxipt


 

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Status: offline 		Filmed today with the fuel mentioned above. RPMs were 1400 shy of the numbers achieved with Davis Diesel bushing formula. This time I also added some scent drops to the fuel tank, so it may be causing poorer running. I'll give another run tomorrow without the scent added and see if rpms improve.

http://www.youtube.com/watch?v=A2V-Da-ti7I

Bob, I usually have better luck at 1/2 to full thorttle for starting with compression screw fully in, even when warm. Thanks for the tip

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RE: Videos of my 40LA diesel - 7/15/2009 9:53 PM   
Mr Cox



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Status: offline 		Please excuse me for being blunt, but I don't understand what you trying to do?

Just get some proper fuel and the engine should start and run fine.

(motorcycle oil is for petrol engines with bearings on all turning parts)

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RE: Videos of my 40LA diesel - 7/15/2009 10:00 PM   
ddd


 

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Status: offline 		We gave you a proper formula to use not to compare with a bad formula, also whatching your video it is clear the engine is too rich all the time, you are also adjusting the compression at to many pionts just the top end please. Please usee the 12 X 6 we suggested. Best of luck and fix your test stand it looks unstable.

P.S. you make choke any engine by putting your finger over the outlet of the muffler for a few seconds.

< Message edited by ddd -- 7/15/2009 10:01 PM >

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RE: Videos of my 40LA diesel - 7/15/2009 10:08 PM   
Patxipt


 

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Status: offline 		Sorry Bob, lost the formula paper.

Also, I don't see why is it wrong to experiment with different fuel mixes. Thta's what got mankind moving, otherwise, we'd still be chasing animals for food with stones (not that it would be worse than nowadays).

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RE: Videos of my 40LA diesel - 7/15/2009 10:38 PM   
Mr Cox



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Status: offline 		Re-inventing the wheel everyday would be a pain too...

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RE: Videos of my 40LA diesel - 7/16/2009 5:20 AM   
ddd


 

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Status: offline 		The idea of most hobbies is to practice them. If you want to be a researcher that's for another day. I give up,if you needed the formula again we would have given it to you. Do you really believe you would make some kind of breakthrough in model diesel; formula, I don't think so. You put a handle on the compression to diddle with it, which is why we did not put a handle on it. It's a 3/16" allen wrench and the drag screw is 1/16"

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RE: Videos of my 40LA diesel - 7/16/2009 9:54 AM   
Patxipt


 

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Status: offline 		I'll ask for the formulas over the e-mail, Bob. Regarding the allen screw, we don't have imperials here, that's why I fited the tommy bar...
No more vids or comments, don't worry, fiddlers seem not to have a place in this forum.

< Message edited by Patxipt -- 7/16/2009 9:56 AM >

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RE: Videos of my 40LA diesel - 7/16/2009 10:06 AM   
Mr Cox



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Status: offline 		Fiddling is of coarse fine and wellcome, but you ask why your engine doesn't start and run well and the answers is that the fuel is wrong.

My advice would be to get some proper fuel and see how it can and should run, then fiddle from there as much as you like....

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