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RE: Diesel 4 strokes - 5/27/2005 8:20:27 PM   
gkamysz


 

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Status: offline 		Hobbsy are you starting it by heating the glow plug as usual? And running it with a glow plug installed? That in my mind would cause serious problems.

Greg

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RE: Diesel 4 strokes - 5/27/2005 9:54:38 PM   
Hobbsy



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Status: offline 		GK, the .80 starts without even having a coil in the glow plug, I removed it, the .50 will not start without the glow plug, but since no catalytic reaction the glow plug goes out as soon as the battery is removed and is not involved any longer. You guys keep talking about using longer rods and pistons with the pinbore lowered to push the piston higher in the cylinder, I removed the head from my Enya .46 4stroke today and the piston comes to the top of the cylinder, where would you have it go?

< Message edited by hobbsy -- 5/28/2005 1:00:50 AM >

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RE: Diesel 4 strokes - 5/27/2005 10:17:56 PM   
Motorboy



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quote:

Ralphbf: How about a shorter rod


Length of connecting rod has good and bad thing, the shorter rod make the piston more side thrust agains cylinderwall and vice versa. Reduced side thrust are better and make less friction.

quote:

JMP_blackfoot: Not exactly. The 70% mix is what Micron recommended. This does not mean that the engine won't run on other mixes. Some of my friends and I have shimmed the heads of our Micron 5 fixed compression engine to run on a standard 40% ether mix. Depending on the weather, we may have to change to more ether if noticeably cold, and less if hot.


I has not knowledge of fixed compression, we had never the fixed comp. engines in Norway. I saw the fuel formula for the american modelengine "Drone" in the book for modelengine. Not very practical when shimming the head. How long will the treads in bolts and in crankcase last after a lot of shimming the head... Better with contrapiston to regulate compression.. The copy of "Drone" dieselengine has contrapiston and a small screw maked of Arne Hende..

Jens Eirik

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RE: Diesel 4 strokes - 5/27/2005 10:46:50 PM   
Ralphbf



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From: Woodland, CA, USA
Status: offline 		Some one had mentioned to much compression, I thought it easier to move the wrist pin up.
Especially on the Saito, where the head and cylinder are one piece.

I wouldn't thing a couple of thousands on an inch would be that drastic.

We use to make stroked small block chevys "301" actually.
that's a 327 crank in a 283 block.... If I remember right.
The 70's were a long time ago.




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RE: Diesel 4 strokes - 5/28/2005 4:48:07 AM   
Motorboy



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quote:

ORIGINAL: Ralphbf

Some one had mentioned to much compression, I thought it easier to move the wrist pin up.
Especially on the Saito, where the head and cylinder are one piece.


Better to adjust with thickness of gasket between cylinder and crankcase after compression ratio are calculated.

Jens Eirik

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RE: Diesel 4 strokes - 5/28/2005 6:36:45 AM   
JMP_blackfoot


 

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quote:

ORIGINAL: Motorboy
Not very practical when shimming the head. How long will the treads in bolts and in crankcase last after a lot of shimming the head... Better with contrapiston to regulate compression.. The copy of "Drone" dieselengine has contrapiston and a small screw maked of Arne Hende..

The head is shimmed only once with standard fuel. In day to day use, if the engine is undercompressed due to low ambient temperature, the ether content of the fuel is increased. In the engine is over compressed, less ether is used. The fuel is changed if required, not the head shims.

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RE: Diesel 4 strokes - 4/16/2006 8:09:12 PM   
LaBam


 

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Status: offline 		How hot do these diesels get? Would this conversion work for a Magnum .30? If it does, will someone tell me all I need to do to convert it?

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RE: Diesel 4 strokes - 4/16/2006 11:04:27 PM   
AMB


 

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Status: offline 		LaBam --I just ran my Mag 30 4 strk davis 1/2 A fuel zinger 10x6 wood prop 8500> I did use the glow plug to start removed after 30seconds engine running fine NO DROP or very little when battery removed let it idle and advanced throttle picked right up did this about 6 times idle to wide open very little lag the engine is stock. A little more compression and would be a "real diesel" no glow needed to start hmmmmmmmmmm. There is no catalytic reaction with diesel to keep the glow plug hot martin

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RE: Diesel 4 strokes - 4/17/2006 12:28:23 AM   
LaBam


 

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Status: offline 		Thanks Dieseldan, So all I have to do is start it like I was running glow and them warm it up really good. Should I run on the rich side? How hot does it get?

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RE: Diesel 4 strokes - 4/17/2006 1:35:22 AM   
AMB


 

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Status: offline 		LaBam I only did this as a test it really runs better on glow running rich may raise the compression a little bit and it did have a little rattle and ran hot, unless the compression is raised it is not efficent as a diesel. what was interesting is any engine 2 or 4 strk will start and run on diesel most very poorly,and will quit as soon as glow power removed,close but not a cigar athinner head shim may help
to raise compression but you could have the piston hit a valve at TDC of course you could regrind the cam lobe to lower the lift and
shorten the pushrods that is after milling down the base of the cylinder motor boy and a couple others have done this I myself do not have the tools nor skills for this, All I proved was my Mag 30 had great compression and just on the edge to being a diesel
In theory if you raised the ether to say 50% it could very well start without glow power but you would most likely have no more power than a glow engine martin

< Message edited by dieseldan -- 4/17/2006 1:42:43 AM >

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RE: Diesel 4 strokes - 4/17/2006 1:40:29 AM   
SGC


 

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Status: offline 		Martin ,
you could try adding a small % of methanol to the fuel , that may help keep the glowplug warm/hot ?
Stewart
Re reading your post " it did have a little rattle and ran hot" sounds like it may have been over compressed ? this will reduce power too.

< Message edited by SGC -- 4/17/2006 1:51:20 AM >

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RE: Diesel 4 strokes - 4/17/2006 2:01:05 AM   
AMB


 

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Status: offline 		Stewart it may have been a normal diesel rattle since I have never run a 4 strk diesel and "hot" maybe not hot as a 4 strk glow now that I remember you could not touch the muffler either. I am used to the cooler running 2 strks you can touch the muffler and not get burned. it really hummed more than rattled. on an other note it appears Enya is going full out on the 41 4 strk diesel orders are piling
up at least in the UK martin

Stewart Forgot one thing I was running in out of the house during this helping with Easter dinner prep and I did reapply glow power while running while holding the tach it did not change at all glow power on or off what really surprised me was going to idle hitting the throttle and up it went NO GLOW
I did this about a year ago with my mag 52 4stk it would not run past a high idle and died as soon as glow removed

< Message edited by dieseldan -- 4/17/2006 2:16:35 AM >

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RE: Diesel 4 strokes - 4/17/2006 3:08:17 AM   
gkamysz


 

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Status: offline 		What kind fo RPM are you getting with the 10x6?

Greg

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RE: Diesel 4 strokes - 4/17/2006 4:00:38 AM   
AMB


 

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Status: offline 		held a steady 8500-8600 martin

I have a Saito 40 which is a great runner but compression appears lower just by flipping quite sure would not work on this one

< Message edited by dieseldan -- 4/17/2006 4:09:18 AM >

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RE: Diesel 4 strokes - 4/17/2006 1:51:31 PM   
gkamysz


 

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Status: offline 		The rattle is a problem either in compression ratio or fuel/air mixture. I've spent quite a bit of time trying to sort it out. How lean can you go?
I have an oddball stroked FS-20 that now displaces .25ci that runs superbly after conversion. It makes a lot of power and runs excellent. It runs much better than the FS-26 and am trying to figure out why. I have two more engines under the knife today.

Greg

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