The OPS engine thread - Page 5 - RC Groups
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Oct 02, 2009, 08:29 AM
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I TOBOR's Avatar
Greg, several months ago I sold my OPS 1.20 fourstroke and 30 MAXI, my MAXI had a Delorto diaphragm carb on it. I put a Davis SoundMaster In Cowl muffler on the MAXI, at idle it was super quiet, the prop swishing was louder than the exhaust.
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Oct 04, 2009, 07:36 PM
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fiery's Avatar
I am enquiring with Mantua Model in Italy as to whether the 1.20 Four Stroke is still available new.

I assumed production had ceased many years ago. Are they still made, or are Mantua just selling off old stock? If I get a reply I will post the answer here.

The copy engine page hyperlinked in an earlier post dates from 2000. A long time ago ...
Last edited by fiery; Oct 05, 2009 at 05:29 AM.
Oct 10, 2009, 12:04 AM
Registered User

OPS engine

Hi, my name is Sébastien. I'm from province of Quebec. I'm recently OPS distributor for OPS engine. I will receive my first stock soon. If you need part for your engine let me know and i will help you. Thanks!!

Oct 23, 2009, 05:29 AM
Registered User

Mantua / OPS build new Engines!
They sell there old and some new construction like the OPS90 Bimetal.

This engine and this Picture is from me!

also the Kaiserspeeder is from me!

Its NOT from Mr. I-Love-jets!

i order my OPS engines from Alex Noller (Noller Modellbau), Germany.
the OPS 90 Bimetal costs ~600$ with pipe.
OPS says 6,5PS by 26000 rpm
I get with a 8x13 21.500 rpm

sry for my bad english
greetings from Paderborn Germany
Oct 28, 2009, 12:32 AM
Registered User
now i find in a good condition OPS 60 SPA RCA for my galaxy.

but i have a little problem whit the slide barrel carb....

the nut of rich fuel is interlocked whit the screw...

someone can post a slide carb disassembled and the best way to refurbish

sorry for my english...
Oct 29, 2009, 08:55 PM
Registered User
Hey FIERY, The OPS 30 MAXY and the .120 4 stroke are always available and their replacement part to. If you need part or complete engine let me know.

Hobby Soulanges
Nov 04, 2009, 07:07 PM
Registered User
i ordered the OPS90 Bimetal engine from Mantua in Britain, unfortunately it arrived in the marine version. i sent it back for credit and have not heard back as to whether the aero version was available yet.
Nov 10, 2009, 07:28 PM
Registered User

Ops 90 bimetal

Yes, the aero version are always available, but I don't know why they don't response you. If you need one let me know??

Hobby Soulanges
Nov 17, 2009, 05:49 PM
Modeller for passion
maxmantua71's Avatar
Hi to everybody.
I confirm that about all engines mentioned and spares are still available at Mantuamodel OPS factory. Including 120 4strokes , not old but 2008 production. In the old building OPS Agrate Brianza were available several parts of the 120 4strokes, left in a corner for long time. With new property of OPS , the moulded cases were worked and a lot of components were made from "0" for the actual 120 sold in a very nice wooden box with silenced muffler. Everyone interested can contact the OPS distributor of their country. In case of no distributors available please contact Mantua directly.
Best regards to all
Feb 07, 2010, 11:15 AM
Registered User
hi guys ,,...I need YR help
yesterday i removed the back cover of my OPS .60 super SPA RCA ...
to check de ball bearing condition....
but unfortunately i didn't pay attention to the correct position of the cover
and now im not sure to reassembled in the correct way...

I made two picture in the two different possible position
which is the correct ones????
Feb 07, 2010, 12:28 PM
Dieselized User
gkamysz's Avatar
The relief in the cover faces toward the cylinder head.

Feb 07, 2010, 12:40 PM
Registered User
so the picture 1 is correct.........
Feb 07, 2010, 09:40 PM
Suspended Account
Yes photo#1. That flat spot is to give clearance for the piston at the bottom of its stroke.
Apr 09, 2010, 10:41 AM
Registered User
erazz's Avatar
Hi Guys got a question,

I have a OPS .60 super SLA RCA. Can it be modified for speed? I have no problems with changing the timing but I'm not sure that the conrod is up to the challenge. Would the front induction be able to supply enough fuel/air for 20+krpm operation?

Thanks for the help
Apr 09, 2010, 10:52 AM
Suspended Account
The Super is a great pattern engine. In that the ports are a little small to help with the keeping the velocity of the inlet charge high just prior to entering the cylinder. This means that they are actually a little too small for speed application. The rod will work. The front induction is now the in thing with full wave tuned pipes. In the past the cutout in the crankshaft for the inlet has been the Achilles heal of the design for any real RPM.

That's my take on it, your milage may differ.

What class of "Speed" are you looking to enter?

All the best,

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