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RE: worst engine ever - 2/24/2007 2:21:34 PM   
Hobbsy



Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		I just checked my engine list, I have about 8 MDS, I have one each new unrun 1.48 and one 2.18. One .78 and one 1.48 are converted to Diesel. I have (2) 2.18s and (3) 1.48s altogether. If you use 5% or less nitro and 20% castor oil they are fine engines.

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       Post #: 26

RE: worst engine ever - 2/24/2007 2:25:47 PM   
KC36330


 

Posts: 2467
Joined: 4/19/2006
From: Enterprise, AL, USA
Status: online
quote:

ORIGINAL: Hobbsy

I just checked my engine list, I have about 8 MDS, I have one each new unrun 1.48 and one 2.18. One .78 and one 1.48 are converted to Diesel. I have (2) 2.18s and (3) 1.48s altogether. If you use 5% or less nitro and 20% castor oil they are fine engines.


maybe they've improved on their chroming ability of the sleeves. the ones i had were about 10 or so yrs ago and everyone around here who bought them had problems with the sleeve lining pealing.

kc

(in reply to Hobbsy)
       Post #: 27

RE: worst engine ever - 2/24/2007 3:42:54 PM   
Ed Cregger



Posts: 7484
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: online 		How do you get Diesel conversion heads for oddball engines?

I have an MDS .48 that came on a prebuilt model that I bought. Turning it over, it feels really good. I was quite surprised, to be honest with you.


Ed Cregger


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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

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       Post #: 28

RE: worst engine ever - 2/24/2007 5:07:33 PM   
KC36330


 

Posts: 2467
Joined: 4/19/2006
From: Enterprise, AL, USA
Status: online
quote:

ORIGINAL: Ed Cregger

How do you get Diesel conversion heads for oddball engines?

I have an MDS .48 that came on a prebuilt model that I bought. Turning it over, it feels really good. I was quite surprised, to be honest with you.


Ed Cregger


you have to check and see what head would fit your engine when it's an odd ball.......below is the list of Davis Diesel heads.

kc


_____ C2K COX .020 Pee Wee Eng. Only (not TD) 29.95 _______
_____ C5/S COX TD/Med .049/.051 Norvel .049/.06 19.95 _______
_____ C5/HD COX .049 Reed Valve with HD Crank 24.95 _______
_____ M10FK O.S. .10 FP or Thunder Tiger .10GP 39.95 _______
_____ OS10LK O.S. 10 LA 39.95 _______
_____ M12CA O.S. .12 CZR/Z/V .LD 55.95 _______
_____ M15K O.S. .15 FP, LA, T.T .15GP (specify) 44.95 _______
_____ F15K FOX .15 Ball Bearing 44.95 _______
_____ K20S K&B Sportster .20/.28 49.95 _______
_____ M20K O.S. .20 FP 52.95 _______
_____ K3.5K K&B 3.5 Outboard & Ducted Fan 52.95 _______
_____ MVS3.5K M.V.V.S. .21 ABC 52.95 _______
_____ M25K O.S. .25 FS, FP, Royal, T. Tiger, GP or PRO 52.95 _______
_____ M25FX O.S. .25 FX 52.95 _______
_____ M25LK O.S. 25 LA 52.95 _______
_____ M32SX/F O.S. .32 F or SX, SXH (specify) 54.95 _______
_____ IRV40K Irvine (Red) .40, .46, .53 (specify) 55.95 _______
_____ M40K O.S. FP/Tower .40, Magnum Pro, T.T .40 55.95 _______
_____ M40LK O.S. .40 LA or .46 LA (specify) 55.95 _______
_____ M40SF O.S. .40 SF, Royal Signature, Mega Tech, RJL 55.95 _______
_____ MVS40K M.V.V.S .40 or .49 ABC (specify) 55.95 _______
_____ T42K Thunder Tiger .42 55.95 _______
_____ S40K Super Tigre 4 bolt head .34/.40/.45/.51 (specify) 55.95 _______
_____ K7.5K K&B 7.5 Outboard & Ducted Fan 59.95 _______
_____ K45S K&B Sportster .45 55.95 _______
_____ F45K FOX .45, .46, .50 Big Case (specify) 55.95 _______
_____ M46AX OS.46 AX 55.95 _______
_____ M46SF O.S. .46 SF, Royal, Ofner, Leo, MegaTech, RJL 55.95 _______
_____ T46K Thunder Tiger .46 55.95 _______
_____ M46FX O.S. .46 FX, ASP .46 FXA 55.95 _______
_____ M50FX O.S. 50 FX, FXH 55.95 _______
_____ F60K Fox Eagle II, III, IV 59.95 _______
_____ M61FX O.S. .61 FX, ABC 59.95 _______
_____ M60K O.S. .60/61 FSR, ABC, SFN 59.95 _______
_____ M61LK O.S. .61 LS Long Stroke, SF, FP 59.95 _______
_____ W60K Webra .61 Speed or Racing 59.95 _______
_____ K65S K&B .65 Sportster 59.95 _______
_____ S61S Supertigre, Como S.61, 61K 59.95 _______
_____ F74K Fox .74 Ring 65.95 _______
_____ F75K Supertigre, Como S.75 or .90 69.95 _______
_____ M91FX O.S. .91 FX 84.95 _______
_____ M1.08K O.S. Max 1.08 FSR 84.95 _______
_____ W1.20K Webra 1.2 or .90 (specify) 84.95 _______
_____ M1.35K Moki 1.35 or 1.8 (specify) 89.95 _______
_____ M1.6FX O.S. 1.60 FX 89.95 _______
_____ ST2000K Super tigre 2.2500, 3000, 3250 (specify) 89.95 _______
_____ ST1.4K Super tigre 2300 89.95 _______
_____ ST4500K Super tigre 4500 99.95 _______



(in reply to Ed Cregger)
       Post #: 29

RE: worst engine ever - 2/24/2007 5:52:09 PM   
WhiteRook



Posts: 841
Joined: 11/3/2002
From: westbrook, ME, USA
Status: offline 		70'S MCOY with plastic head, it looked like plastic, no compression from the start

junk

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       Post #: 30

RE: worst engine ever - 2/24/2007 6:24:36 PM   
Motorboy



Posts: 1629
Joined: 2/7/2004
From: Bergen, NORWAY
Status: offline
quote:

ORIGINAL: Ed Cregger

How do you get Diesel conversion heads for oddball engines?

I have an MDS .48 that came on a prebuilt model that I bought. Turning it over, it feels really good. I was quite surprised, to be honest with you.


Ed Cregger


Ed Cregger...

Not enough to see at the price list who KC36330 wrote..

Davis Diesel Development wrote this text in price list:

If you don’t see, ask.

Jens Eirik

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All landings are just controlled crashes!

(in reply to Ed Cregger)
       Post #: 31

RE: worst engine ever - 2/24/2007 6:33:52 PM   
Ed Cregger



Posts: 7484
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: online
quote:

ORIGINAL: Motorboy


quote:

ORIGINAL: Ed Cregger

How do you get Diesel conversion heads for oddball engines?

I have an MDS .48 that came on a prebuilt model that I bought. Turning it over, it feels really good. I was quite surprised, to be honest with you.


Ed Cregger


Ed Cregger...

Not enough to see at the price list who KC36330 wrote..

Davis Diesel Development wrote this text in price list:

If you don’t see, ask.

Jens Eirik



----------------


That's a good point.

If I get on the phone with Bob, I don't get off for over an hour. This old feller (me) has, of all things, developed a goiter in my later years, making it difficult to talk for more than a couple of minutes at a time (pressure on the larynx). I enjoy Bob's banter, he is one interesting fellow, but I can't hang in there very long on the phone these days. It's killed amateur radio for me on phone too. Thankfully, there are still the digital modes and CW (code) still available.

I have no idea what other engine would share the same cylinder head pattern as the MDS. Anyone?


Ed Cregger





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Artisan

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RE: worst engine ever - 2/24/2007 10:31:48 PM   
donkey doctor



Posts: 1172
Joined: 12/1/2002
From: Lake Cowichan, BC, CANADA
Status: offline 		Hello; My worst all-time engine was a Webra silverline 40, I should have wondered when I bought it brand new for $30. There were 4 other webra's at our field but the one I got just wouldn't run well for any length of time. I have gone over to four strokes exclusively now, and have owned some pretty good two strokes (os TT and Enya) but that Webra put me off two strokes forever.

I have a few Fox's, they seem to run okay if you set the low speed needle first, then the high speed.

(in reply to Ed Cregger)
       Post #: 33

RE: worst engine ever - 2/24/2007 11:39:14 PM   
Ed Cregger



Posts: 7484
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: online
quote:

ORIGINAL: donkey doctor

Hello; My worst all-time engine was a Webra silverline 40, I should have wondered when I bought it brand new for $30. There were 4 other webra's at our field but the one I got just wouldn't run well for any length of time. I have gone over to four strokes exclusively now, and have owned some pretty good two strokes (os TT and Enya) but that Webra put me off two strokes forever.

I have a few Fox's, they seem to run okay if you set the low speed needle first, then the high speed.



-------------


Normally, Webra engines are premium products. I remember the Silverlines from the early 1990's. They were Webra's economy engine line. They were "rough" from the factory, but if made properly by Webra and broken-in properly, by the owner, they would turn into long lasting power producers. Of course, you have to get them started before you can break them in and once running, you had to run them very rich for an hour or so before the ring would come into round. Webra used hard metals in their construction, so break-in could be a lengthy process. What did you have when finished? An engine with the power of an OS .46LA that would run nearly forever if you kept some form of protectant in the crankcase to preserve the ball bearings between runs. Nothing fancy, but a fine, reliable engine.


Ed Cregger



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Artisan

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RE: worst engine ever - 2/25/2007 1:23:29 AM   
Hobbsy



Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Doc, I can't imagine the Webra SilverLine .40 giving you trouble, I bought a SilverLine .40 and .61 together for $69.00 both are fine engines. You got a lemon I guess.

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RE: worst engine ever - 2/25/2007 7:36:47 AM   
XJet


 

Posts: 3215
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: online
quote:

ORIGINAL: Lotus72D

For me it was the HP 21 4 cycle. Neat looking but heavy and put out no more power than a good Cox TD 049! Would barely fly a 3 channel "Pronto"...


I agree that the VT21 is a woefully weak motor -- but they're so quiet and will turn almost any size prop -- so they're great for laid-back sunday afternoon flying in a lightly-loaded model just doing touch-and-goes.


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RE: worst engine ever - 2/25/2007 12:45:51 PM   
Hobbsy



Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		When MECOA took over Mfg. of the VT .21 and .49 they tweaked both to be more powerful.

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       Post #: 37

RE: worst engine ever - 2/25/2007 2:40:45 PM   
jaka


 

Posts: 4347
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
If you had asked me 43 years ago I would definitely say OS Pet .10! I can still remember how I struggled to get it starting.... And the joy for a 9 year old when it finally did start.

Now I would say: Russian, 7cc "Raduga", CL-engine! Nothing can come close to it!

< Message edited by jaka -- 2/25/2007 4:20:40 PM >

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RE: worst engine ever - 2/25/2007 3:22:22 PM   
MOTORMAN37



Posts: 2043
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: online 		You sure you do not have OS mixed up with MDS when talking about peeled liners. OS is the company that had peeling problems with there high tech "ABL" technology.



quote:

ORIGINAL: KC36330


quote:

ORIGINAL: Hobbsy

I just checked my engine list, I have about 8 MDS, I have one each new unrun 1.48 and one 2.18. One .78 and one 1.48 are converted to Diesel. I have (2) 2.18s and (3) 1.48s altogether. If you use 5% or less nitro and 20% castor oil they are fine engines.


maybe they've improved on their chroming ability of the sleeves. the ones i had were about 10 or so yrs ago and everyone around here who bought them had problems with the sleeve lining pealing.

kc



(in reply to KC36330)
       Post #: 39

RE: worst engine ever - 2/25/2007 3:42:17 PM   
Hobbsy



Posts: 10426
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		You're right David, peeling liners was never a problem with MDS engines.

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