RE: Diesel 4 strokes  
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RE: Diesel 4 strokes - 8/11/2006 7:01:01 PM   
PlaneKrazee



Posts: 3578
Joined: 5/15/2002
From: Westerly, RI, USA
Status: offline 		Greg,

May I ask what diameter contrapiston and thread size did you use?

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RE: Diesel 4 strokes - 8/11/2006 8:47:14 PM   
Motorboy



Posts: 1715
Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline 		I maked the Lanova combustion cell to SC 52 fourstroke as showed in the photo in early post in this forum. The tread dimension are same as glowplug 1/4-32 and the top of screw are at 1/2-16 and compression screw M4x0,7. Contrapiston diameter are at 10 mm and fitted with O-ring.

Jens Eirik

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RE: Diesel 4 strokes - 8/11/2006 11:00:42 PM   
PlaneKrazee



Posts: 3578
Joined: 5/15/2002
From: Westerly, RI, USA
Status: offline 		Thank you Motorboy!!!!!!!!!!!!

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RE: Diesel 4 strokes - 8/11/2006 11:20:15 PM   
PlaneKrazee



Posts: 3578
Joined: 5/15/2002
From: Westerly, RI, USA
Status: offline 		One of my Enya .53's may be a good engine for conversion, it will knock hard with a big prop before you can peak the needle and came with a head shim to prevent this. It'll turn a APC 13X4 well but did not like the Rev-up Deci-Ban 11 1/2X8 at all without the shim. It has a lot of compression and may not need machine work on the head.

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RE: Diesel 4 strokes - 8/23/2006 2:28:55 AM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		I flew my OS FS48 conversion on etherless fuel today. I arrived at the field at 4:20 and prepared my airplane. With nobody at the field, it was all mine. I warmed the engine on old fuel in the tank from who knows when. That go it hot enough to run on etherless mix. I proceeded to tune as I got the needle all out of whack during starting. I flew the model and landed a few times to adjust compression and needles. An old club member arrived and we caught up while I was flying. I landed to refuel. I wasn't out, but thought it was near the end. I continued to fly. I was in the air for quite a while and made some adjustments to the carb. I did a lot of WOT flying to see how it reacted to loading on climbs and such. It was getting hot and preigniting earlier. By this time the temperature had dropped a bit and it was running very well. I made a landing and was about to take off agian when I lost throttle control. I thought I ran the battery down. The model did ground loops until the engine died a few tense seconds later. I asked the time and it was 5:40. I put the plane away and emptied the tank back into the fuel container. I was surprised at how much fuel was left. I arrived with 15 fluid oz of etherless fuel and went home with 5oz in the bottle. The fuel economy of etherless mix is outstanding. Now to tune the engine and carb to give smooth running and reliable starts.

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RE: Diesel 4 strokes - 8/23/2006 10:56:37 AM   
Hobbsy



Posts: 10836
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Brian, I will try my .53 on some Davis Diesel fuel, my Saito .50 will run on it at full throttle but will not idle, the compression is just a tad low and on my Saito .80 it is too high.

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RE: Diesel 4 strokes - 8/23/2006 11:53:26 AM   
PlaneKrazee



Posts: 3578
Joined: 5/15/2002
From: Westerly, RI, USA
Status: offline 		Hi Dave,

I'll be interested to hear how you make out. I think with the right prop it will work. Fun to try anyway.

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RE: Diesel 4 strokes - 8/23/2006 12:42:24 PM   
Hobbsy



Posts: 10836
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Hey Brian, yep, spearmentin is half the fun. Good word, huh. I'll let you know how it goes. Thanks

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       Post #: 108

RE: 4 stroke diesels - 9/3/2006 6:02:00 AM   
dieseldo


 

Posts: 2
Joined: 8/20/2006
From: brisbane, AUSTRALIA
Status: offline 		hi jens;
would it be at all possible for you to post an engineer's drawing of your 'lanova cell'. i have an os 48 surpass i have modified to accept your lanova cell . fortunately i have some work colleague's that done the machine work for me on a 'cnc' machine , which was quite a simple process,apparently.
regards;stevo

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       Post #: 109

RE: Diesel 4 strokes - 9/3/2006 6:13:44 PM   
hummingbee


 

Posts: 2
Joined: 8/22/2006
From: bradfordwest yorkshire, UNITED KINGDOM
Status: offline 		Howdy to the tribe from Manchester, England, UK.


The four-stroke diesel continues to remain an elusive Yeti by the sounds of it, and I was wondering whether I might bring the attention of people to another rare breed of diesel.
Does anyone have experience of large two-stroke diesels. I am talking about engine capacity in the order of 10 cc in particular. It would seem that the largest purpose-built two-stroke diesel on the market is the 10 cc motor made by PAW in Britain. PAWs are made in Macclesfield, which only about 20 miles or so from where I live in Manchester, England, and I am expressing loyalty to this famous and longstanding and proven and very local manufacturer.
(I believe MVVS also have a similarly large diesel on offer, with a conversion of their basic glow motor. So, to my knowledge from a purist sort of perspective, PAW are the only people who make a 10 cc diesel.)
Taste is very much an individual thing and I personally quite like the somewhat retro design of the PAW motors. Does anyone out there have any personal experience on the operating characteristics of a 10 cc diesel motor. I intend using it in an Old-Timer Ben Buckle-style ship that has a wingspan of 9 feet that I've recently acquired.
Actually it's a ship called the KMS Commodore and was designed in the 1930s by an Englishman who owned a model shop in southern England called Kingston Model Supplies. There's a snippet of British aeromodelling history ! To my knowledge this is a unique model in so far as none others being in existence to the very best of my knowledge, and sort of looks like a large Ben Buckle Majestic Major to those of you acquainted with the genre of vintage aircraft. It's meant to be powered by one of those sedate spark-ignition things according to the diagram on the plans, but I'd much prefer a nice diesel smelling sweet and turning a big wooden prop slowly.



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RE: Diesel 4 strokes - 9/3/2006 6:21:52 PM   
Hobbsy



Posts: 10836
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		I have a PAW .60 Diesel and the MVVS .61 conversion, the MVVS turns a 14x7 at about 9,500, it is a long stroke engine 23mm bore and 24mm stroke. The PAW is not quite as strong but plugs away no matter what prop you put on it. The PAW .60 has a cool sound also.

< Message edited by Hobbsy -- 9/4/2006 11:31:15 AM >

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RE: Diesel 4 strokes - 9/3/2006 6:56:55 PM   
hummingbee


 

Posts: 2
Joined: 8/22/2006
From: bradfordwest yorkshire, UNITED KINGDOM
Status: offline 		Thanks for your thoughts Hobbsy.

So do you think it would be better for me to opt for the MVVS rather than the PAW ?

As I said, it's a case of form over function here, and to my jaundiced eye the PAWs are prettier than their MVVS adversaries any day of the year you care to compete !

I take there are no great tricks in operating the large diesels ?

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       Post #: 112

RE: Diesel 4 strokes - 9/3/2006 9:00:45 PM   
j.hiner@comcast.net


 

Posts: 211
Joined: 7/25/2003
From: Downers Grove, IL, USA
Status: online 		I have both the MVVS and the PAW 10 cc diesel engines. The MVVS is more powerfull. The PAW is easier starting and has a smaller muffler and I like that. The PAW reminds me of the early 1950's in performance and looks. I have to turn the compression screw down three turns on the MVVS to start and only 1/2 or less turn on the PAW to start the engine. For an old time model I would go with the PAW. For a WWII fighter I would go with the MVVS. I like both engines, Jack

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RE: Diesel 4 strokes - 9/4/2006 4:18:28 AM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		Four stroke diesels are not anything mystical. It's just that there has been no need for them so none had been developed.

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RE: Diesel 4 strokes - 10/28/2006 12:10:14 AM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		Just got an OS 91 to conver to diesel.

A couple of questions:

Did you guys shorten the push rods or was there enough adjustment after lowering the head?

How did you hold the head in the 4 jaw chuck without damage?

Thanks,
Treven.

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       Post #: 115

RE: Diesel 4 strokes - 10/28/2006 4:09:01 AM   
Motorboy