RE: Diesel 4 strokes  
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RE: Diesel 4 strokes - 3/29/2004 2:22:10 AM   
capin


 

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From: ellicott city, MD, USA
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       Post #: 51

RE: Diesel 4 strokes - 3/29/2004 2:24:23 AM   
capin


 

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From: ellicott city, MD, USA
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       Post #: 52

RE: Diesel 4 strokes - 11/28/2004 11:08:41 AM   
knarF


 

Posts: 84
Joined: 11/28/2004
From: None, NETHERLANDS
Status: offline 		Isnt it an idea to use external compression chambers on regular 2 strokes ?
That would make a conversion of a glow to diesel much easyer. (for me)

Question : how do you seal the contracilinder in the chamber to prevent leaking ? (O-rings or just tight fit ?)

Best regards

Frank

< Message edited by knarF -- 11/28/2004 11:09:43 AM >

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       Post #: 53

RE: Diesel 4 strokes - 11/28/2004 1:04:40 PM   
Hobbsy



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From: Colonial Beach, VA, USA
Status: offline 		Knarf, a tight fitting contrapiston and one or two O-rings depending on the size of the head.

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       Post #: 54

RE: Diesel 4 strokes - 11/28/2004 1:33:01 PM   
knarF


 

Posts: 84
Joined: 11/28/2004
From: None, NETHERLANDS
Status: offline 		Thanks, what material are the O rings made of ? Rubber rings dont seem very heat resistent to me

Regards,

Frank

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       Post #: 55

RE: Diesel 4 strokes - 11/28/2004 3:59:24 PM   
ajcoholic



Posts: 4044
Joined: 6/22/2002
From: Kirkland Lake, ON, CANADA
Status: offline 		Viton O rings will withstand the running temps, if the contra is fit close enough (1/2 thousandth) to not allow extremely hot combustion gasses to get to the O rings easily.

I tried regular O rings (the kind you get from a plumbing supply or hardware store) and they are not good. Viton are available from industrial suppliers.

AJC


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       Post #: 56

RE: Diesel 4 strokes - 1/11/2005 12:43:36 AM   
erik58


 

Posts: 122
Joined: 1/11/2003
From: easthaven, CT, USA
Status: offline 		hello-if Jens Eirik is out there could any one tell me just how much metal you have to shave off on the os head or give me a cc size? thanks Erik once you go diesel you never go back

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       Post #: 57

RE: Diesel 4 strokes - 1/11/2005 5:29:51 AM   
Motorboy



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Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline 		You must calculate first how much you have shape off on the OS head. Recommending 20:1-22:1 compression ratio in cylinder head and make combustion camber with contrapiston who can regulate between 14:1 to max.

Jens Eirik

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       Post #: 58

RE: Diesel 4 strokes - 1/11/2005 7:00:57 AM   
Motorboy



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From: Bergen, NORWAY
Status: offline 		I forgotten to write more, first remove material from engineblock then check the sleeve must be in same height as piston before you shape off cylinder head after you has calculated compression ratio.

Jens Eirik

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RE: Diesel 4 strokes - 1/30/2005 7:17:08 PM   
joe78586



Posts: 204
Joined: 12/29/2002
From: San Benito, TX, USA
Status: offline 		Doese anyone have a video of thier conversions? I really want to hear one.

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RE: Diesel 4 strokes - 2/1/2005 10:30:55 PM   
capin


 

Posts: 82
Joined: 1/19/2002
From: ellicott city, MD, USA
Status: offline 		Sadly, I'm in the middle of moving but when I get my machines set back up I'm going to do a 48 os and a 91 or a 120. The asp 80 is neat but I haven't ran it in month's. They do sound neat!!!! to say the least. Brian P.S. I am getting a 4 stroke fleet to convert now!

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       Post #: 61

RE: Diesel 4 strokes - 5/25/2005 7:38:59 PM   
mbiedul



Posts: 40
Joined: 11/29/2002
From: Edmonton, AB, CANADA
Status: offline 		Jens: You have sure got my attention with your Lanova chamber idea. Congratulations on a very fine job, and generous sharing of your ideas! -Mike Biedul, Canada

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       Post #: 62

RE: Diesel 4 strokes - 5/26/2005 4:05:28 PM   
gkamysz


 

Posts: 1758
Joined: 6/24/2003
From: Crystal Lake, IL, USA
Status: offline 		Is there any reason one wouldn't just make a new rod which is longer to give the needed increase in compression ratio? It seems to me that all the work on the head and sleeve leaves too much chance for error. A new rod would allow conversion back to standard use.

Greg

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       Post #: 63

RE: Diesel 4 strokes - 5/26/2005 4:18:02 PM   
Hobbsy



Posts: 10836
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		To run standard model Diesel fuel you need lower compression not higher, I tried it in my Saito .80 and the compression is too high, it will start stone cold and run at idle and slighty above. Beyond that it begins to sound way overcompressed. A longer rod is not feasable anyway because most fourstroke pistons come to the very top of the cylinder.

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RE: Diesel 4 strokes - 5/26/2005 5:42:16 PM   
Motorboy



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quote:

ORIGINAL: hobbsy

To run standard model Diesel fuel you need lower compression not higher, I tried it in my Saito .80 and the compression is too high, it will start stone cold and run at idle and slighty above. Beyond that it begins to sound way overcompressed.


I calculated and removed material in the cylinder head and crankcase and come up to about 20:1 compression ratio, then i maked the combustion cell/lanova and i regulate compression ratio between 14:1 and 19:1 with contrapiston in combustion cell/lanova. Works very well..

quote:

A longer rod is not feasable anyway because most fourstroke pistons come to the very top of the cylinder.


It is not possible, because the cylinder head has to big combustion camber and less compression ratio. Therefore i removed the material in cylinder head.


Jens Eirik

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       Post #: 65

RE: Diesel 4 strokes - 5/26/2005 6:15:27 PM   
Hobbsy