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Aug 08, 2018, 06:57 PM
Thermals, Tom
RyanNX211's Avatar
Cool

Four Stroke diesels


These are so fun. Laser had a short run of them but they’ll cost you a lot if you find someone willing to part with one.
This O.S .52 of mine was converted by Diesel RC.
http://www.thebuildingboard.com/2018...st_21.html?m=1
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Aug 08, 2018, 06:59 PM
Thermals, Tom
RyanNX211's Avatar
I gave my dad one of the Enyas for his birthday. It has
a fixed compression but that never seemed to be an issue.

ENYA 41-4C diesel engine R/C 6,64 cm3 (3 min 46 sec)
Latest blog entry: Steak and Old Timers
Aug 08, 2018, 07:03 PM
Registered User
I TOBOR's Avatar
This is a Saito .80 running on Davis Diesel fuel. It is turning a 13.5 x 8 Bolly Clubman prop at 8,792 and idling at 1,541. The only mod is removing the coil from the glow plug.
Aug 08, 2018, 07:09 PM
Thermals, Tom
RyanNX211's Avatar
Their last 4 Stroke Diesel was a 36.
Good luck finding one.

ENYA 36-4C-TN Diesel (14 min 39 sec)
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Aug 08, 2018, 07:20 PM
Thermals, Tom
RyanNX211's Avatar
I wonder what the compression ratio of your Saito is.
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Aug 09, 2018, 01:27 AM
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surfer_kris's Avatar
There always seems to be a lot of knocking in the fourstroke engines though, especially during acceleration. I haven't seen anyone that runs as smooth as the two strokes can do:

MVVS .09 Diesel #2 (9x4 prop) (0 min 52 sec)
Aug 09, 2018, 03:13 AM
Thermals, Tom
RyanNX211's Avatar
I don’t have an explanation
Latest blog entry: Steak and Old Timers
Aug 09, 2018, 03:49 AM
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surfer_kris's Avatar
I don't know the reason either, but that is perhaps why they were never produced in any big numbers....
Aug 09, 2018, 05:50 AM
Registered User
I TOBOR's Avatar
It's compression ratio is 15.5 to 1, it is fairly quiet when peaked but when set a little rich it's quite clattery. Here is something you'll all think is backwards but on a 13x6 it will only turn 5,500 and no matter what you do it sounds like it's going to explode but when loaded with the 13.5 x 8 it runs at 8,700+ and is very smooth.
Aug 09, 2018, 06:40 AM
The great Brutufier
IMHO not backwards at all… I think it indicates a bit too early ignition for the load.
Maybe too high compression or too much ether?
Aug 09, 2018, 07:21 AM
Whatever It Takes
Gary Cee's Avatar
Probably as you said Bert.

That makes adjustable compression a desirable option. More easily accomplished with a typical two-stroke/cycle system.
Aug 09, 2018, 07:38 AM
Engine man
dmrcflyr2's Avatar
Quote:
Originally Posted by RyanNX211
Their last 4 Stroke Diesel was a 36.
Good luck finding one.

https://youtu.be/DClj96aCTnw
The rocker cover is installed backwards on this engine....

Why would you need to find one? If Dave just removed the element from a glow plug and ran his Saito 80, you could do the same thing with any 4 stroke engine. I might just have to give this a shot.
Aug 09, 2018, 08:27 AM
Whatever It Takes
Gary Cee's Avatar
Dave didn't say but that may have been an older high compression model. Saito quickly dropped the C/R on that model after the original release.
Aug 09, 2018, 09:01 AM
Engine man
dmrcflyr2's Avatar
Quote:
Originally Posted by Gary Cee
Dave didn't say but that may have been an older high compression model. Saito quickly dropped the C/R on that model after the original release.
Yes, Dave's is an older 15.5:1 CR engine.
Aug 09, 2018, 09:21 AM
Thermals, Tom
RyanNX211's Avatar
Quote:
Originally Posted by dmrcflyr2
The rocker cover is installed backwards on this engine....
Might be for clearance. The 46 won’t run with it on.

Quote:
Why would you need to find one? If Dave just removed the element from a glow plug and ran his Saito 80, you could do the same thing with any 4 stroke engine. I might just have to give this a shot.
Diesels are beefed up if made as diesels. Also, variable compression is nice.
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