Mintor 2 Plug Head?
 

I recently purchased a second OS1.40 that had a Mintor 2 plug head. Question: Is it necessary to use a dual glow plug ignitor, or can I just use a single ignitor on the center plug. If I do that, will the second plug perform normally once the engine is running. Thanks.

RE: Mintor 2 Plug Head?
 

That´s it . . . . the second plug lights up once the engine starts. Just make sure you have either an OS A5, or an OS No8 plug at the front and an OS"F" at the back. I have two OS 140s, with the Mintor heads. The 3M head really improves response and smooths out the mid range.

For good info on muffler and pipe set ups, Check out Ed Hartley´s 2 stroke page.
www.rcpattern.com/2cycle.htm

Ola Flemming also has a good page on the OS 140
http://home.online.no/~ofremmi/F3A/T.../os_140_rx.htm

RE: Mintor 2 Plug Head?
 

And if you can't get the idle down to about 1200 reliably, you're doing something wrong.

The OS is the most reliable pattern engine there is. I just wish it had a tad more power. I've been through quite a few of those things, but have recently moved to the 3M 170.

I either ran an A5 in the front and an F in the rear, or 2 Fs. The 2 Fs gave better performance, but it did eat plugs more often that way. But you could get the idle down around 1000 and have instantaneous response. With 15% nitro that is; but that engine likes 20% or even 25%. But then it starts eating plugs like crazy.

-Mike

RE: Mintor 2 Plug Head?
 

HI Mike:
What kind of muffler, I mean Tuned-Pipe, do you use on your OS 140RX? I am planning put an OS140RX on my Majestic 140. Is it a good choice? I have heard that YS like Nitro, how about OS? WIll 5% nitro be enough to this monster?
Thanks.

RE: Mintor 2 Plug Head?
 

It will run fine on 5%, it just likes higher nitro as well. I ran mine on 5% for the better part of a year, no problems.

It should be fine on a Majestic, they tend to come in under 10 lbs. If you can keep the weight down to around 9.5 lbs or lower, you will be very pleased. Even at 10 you should have unlimited vertical power. I had an 11 lb plane that would hover with an OS at about half throttle, so the power is there.

I used the standard OS header, and an ES carbon pipe. A 2C140M80 to be exact. Don't worry about tuning it, it's not necessary....but if you need more power, that's a good way to get it at SOME loss of transition. The props it seems to like are the APC 16x13W, 17x10N, and the Bolly 17.5x12.

-Mike

RE: Mintor 2 Plug Head?
 

The second plug will light once the engine is brought up to peak rpm. I set my Mintor 1.70 at 1500rpm idle which is slow enough and still very reliable. You will generally know a plug is gone when it starts to load up a little after long idle or throttle up from and extended idle manuver like after a 3 turn spin. So far no flame outs here. The people I know running the Mintor head on the OS are experiencing similar results like in the regular Mintor.

15% fuel works great. I run Cool Power and it does not gum up in the piston and ring and the header stays clean.

Wayne G.

RE: Mintor 2 Plug Head?
 

I am planning to run my Os 140 RX in my first 2 m plane, with only 5 % nitro because in Colombia the nitro is very dificult to obtain and very expensive : 60 dollars 1 Galon 10%!!!

It is enough nitro? and what about the oil content: 15 % -18 % castor or sintetic?

Thanks for your help.

Jorge Lozano
Pattern flyer
[sm=confused.gif]

RE: Mintor 2 Plug Head?
 

my buddy flys a 140 RX and his runs as good as any engine will. he uses 25% with the mintor head.

RE: Mintor 2 Plug Head?
 

hello
it's possible to modify the os 91 fx and put dual plugs?
improve the response.
my son fly a epsilon 90

RE: Mintor 2 Plug Head?
 

Best mod for the 91 fx is a perry pump and shim the head to reduce compression, with an "S" header from Karl Meuler and a Macs pipe.

RE: Mintor 2 Plug Head?
 

lot off us here in Norway has this Mintor heads ..gives some more power and nice mid range.
But i think i know off 4 -5 that got smal cracks in them ... it start to use a lot off fuel and full belly pan off fuel and oil!
I now use the Japanees 2 plugs top ..dont remeber the name off it same mid range but a bit less power ..like the original!

RE: Mintor 2 Plug Head?
 

Hi Rune,

The Japanese twin plug head is made by Bell Wood. The order number is -150142-. I bought one from Ishii Mokei for JPY13.000 which is US$ 113.

How many head shims and which glow plugs do you use with the Bell Wood head? I’m currently building an OS 140 powered MK Top Star for the next season.

http://www.ishiimokei.com/


Best regards,
Henning Jorkjend

RE: Mintor 2 Plug Head?
 

Hi Henning!
i dont rember but it is 2 or 3 .... and 2 os f plugs and the long "low pressure" greve pipe!
15 \ 15 fuel aerosynth 3 oil
Rune

RE: Mintor 2 Plug Head?
 

Lorenz only list one pipe for the OS140. They use to list two or three I think. Please find attached a picture and text copied from www.f3alorenz.de. Unfortunately it’s in German only. Order number 441. It’s a new pipe with larger volume. Length 520mm and diameter 49mm. The old pipe was 40mm in diameter. Is it this pipe you use?

"Der Nachfolger
Neues optimiertes Resonanzrohr 20 - 30 ccm
Neues optimiertes Resonanzrohr aus Aluminium. Komplett Lasergeschweißt und daher auch nach langer Betriebszeit absolut dicht. Sehr leise und von 20 - 30 ccm geeignet, hervorragend für OS 140 oder OS 160.
3 Nachdämpfer integriert. Die Außenwandung ist jetzt um Bruchteile von mm stärker, dadurch ein sehr angenehmer Klang.
Abstimmlänge je nach Drehzahl: ca. 60 cm bei 8000 U/min - ca. 70 cm bei 7000 U/min. Länge 520 mm x 49 mm Durchmesser, Gewicht: ca. 165 g (bei der alten Serie mit 40 mm Durchmesser musste man zum angegebenen Gewicht fairerweise eigentlich auch die ca. 25 cm langen Zwischenstücke mit Verbindungssilikon hinzurechnen.)"




Henning

RE: Mintor 2 Plug Head?
 

Lorenz had several ...just checked his web and for this engine size he has only that you mention.
I not home right now at work in Bodø so cant check what i used last year ..nut think most off the greve and other well know pipes will do the job just fine!
I think you will find the Os 140 as a nice easy engine to use just remember that the original bearings most likely will have to be change, both my Os engines got new bearings after a short time!
I use Skf stainless bearings and have great success with that... W 61904 2rs1 i think the serial number is ....

RE: Mintor 2 Plug Head?
 

Thanks Rune!

I plan to use the rear bearing for OS 140FI. It’s a sealed bearing with C3 tolerance. If it should fail I will replace it with a SKF bearing.

Yes, the OS140 is easy to operate as long as the air temperature is above freezing. We used them on the “target drones” during my national service. The OS140 was run stock with Hatori
#900 pipe.

Henning

RE: Mintor 2 Plug Head?
 

we used OS 90 and 108 on the "drones" so a 140 would be great on them i think!
i have flown down t0 minus 15 deegreds with the 140 no problems but its nice to have a good starter, can be hard to hand start!

RE: Mintor 2 Plug Head?
 

Wow, I'm excited! I have the Bellwood head on my 1.40, I never knew what head it was though. I got the motor from a friend of mine who got it from Quique, and that head has really generated a lot of interest. Now I'll be able to tell people who makes it finally and order one in the future. Thank you so much Henning!

BTW, I don't have any head shims, I'm running CoolPower 20% Heli blend, Asano pipe and header, dual OS 'F' plugs and a 15x10W Dave Lockhart three blade on a PL Products Partner and this setup hauls the airplane around better than a YS 1.60DZ. I fly big and far out and this motor setup has the grunt to pull it around with ease in all but the most extreme wind. It also does a great job of flying the F3A sequences, a few of my friends and myself have flown both the current P and F sequences with no problem. Good luck with your airplane.

RE: Mintor 2 Plug Head?
 

i use 15\15 and as i say dont remeber no off shim ..2 os f and a APC 18x10 Sport ...gives nice breaking downlines and a wery nice power up.
but i plan to try the YS 160 DZ next season!

RE: Mintor 2 Plug Head?
 

Henning,

If I remember correctly Lorentz also had a low pressure pipe, order number 444. But the one in your picture at least looks like that one. Works very well! I'm still using the twin plug head from Lorentz, just waiting for it to crack...

Looking forward to next season. It will be great fun too with more pattern activity at Bingen... :) Are you on track with building your new plane?

Regards,
Dag Ragnar

RE: Mintor 2 Plug Head?
 

Hi Dag Ragnar,

I have to email Lorenz and ask if they still make the 444. What is the total length of your exhaust system measured from the glow plug to the outlet of the pipe?

Most of the Top Star is glued together. Just three month of sanding and I’m ready for covering:)


Henning

RE: Mintor 2 Plug Head?
 

Hello Friends,
3M Mintor Dealer in USA is Fedon aircraft at [link=http://www.fedonaircraft.net/]Fedon Aircraft[/link]. I think they are able to send you 3M Mintor dual header.

RE: Mintor 2 Plug Head?
 

Hi Henning,

Will have to measure it to give an exact answer. But it's almost the same as Rune and Ola. Think that Lorentz recommends about 90cm, and I ended up with 87 if that makes sense. Will get back to you on the exact length.

~DR