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HelicopterEngines Plugs Mufflers Fuel › Question about OMI modification
11-27-2007 05:20 PM  9 years agoPost 1
ferincr

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sometimes in Costa Rica sometimes in the US

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Hi, I've seen that the OMI mod. is extremely common (at least on OS91 engines) and I'd like to know exactly what does it do, is it for getting extra power out of the engine or just to make it run smoother along the whole flight? If this is the case, is it something that the new CarbSmart could do too without modding the engine?
Thanks for any info,
Fernando

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11-27-2007 06:50 PM  9 years agoPost 2
Dr.Ben

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Richmond, VA, USA

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The basic OMI mod adds a Cline fuel regulator and a few carb internal changes to create a pressurized fuel delivery system. The result is a consistent run over the entire tank with the needles being set for near max power.

The OMI mod alone to the 60K carb does nothing for the peak hp of the engine. If you have them also do the big-bore mod which opens of the throat/intake of the carb, then the engine will make more power.

The OMI mod alone done to the STOCK, NON-PUMPED SZ carb creates about the same power as a big bore 60K, because the SZ carb has about the same bore to begin with. Thus the SZ carb is a better deal if you're looking at buying a carb.

NO pumped OS carb can accept the Cline mod.

Ben Minor

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11-27-2007 10:00 PM  9 years agoPost 3
ferincr

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sometimes in Costa Rica sometimes in the US

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Thanks Ben,
So if I understand this correctly, if I do have the SZH (with the 60M carb) it wont make any difference in power, only consistency in running.
It would tough increase the power if done in the "older" 60K carb due to the bigger bore mod.
So, unless I experience inconsistencies in the running I wouldn't notice major differences on the SZH.
Now would the CarbSmart take care of the consistent operation or would it only keep the needles at the "optimum" settings without necessarily operate the engine consistently?
Thanks,
Fernando

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11-28-2007 01:18 PM  9 years agoPost 4
NORTHERNLIGHTS

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Riverview FL

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A call to James Oneal would answer all your questions. He`s happy to explain what his mod does.

B.O.A.T. Break Out Another Thousand!

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11-28-2007 01:26 PM  9 years agoPost 5
jsenicka

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Eagle River, WI

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I am going to be running both (OMI/Cline and Carbsmart) on my 90's. The OMI/Cline gives me better carburation in general, and removes the need for muffler pressure and most of the clunk line issues. The Carbsmart lets me actually run at close to peak power and not worry about changing temps, load factor, etc. I guess I could just count on the automatic mix control, but to me doing the OMI/Cline will make it far more reliable.

Jim Senicka
Team Manager, GrandRC Flight Team

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11-28-2007 01:54 PM  9 years agoPost 6
Kader

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Czech Republic

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And what about OMI VIPER twin glo head on the OS 91 SZ Hyper-no pump version ? Have this modification itself some benefit (whithout OMI Cline carb and reg) ? And if so, which pair of glow plugs is optimal using with this OMI Viper Head ? Hot and cold or pair glow plugs, which are the same (2x hot the same , eventually 2x cold the same) ?

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11-28-2007 06:11 PM  9 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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It's the big bore mod that increases the potential power of the 60K carb. The SZ carb already has the larger bore. In either case, the Cline does NOT increase the hp of the engine, only the consistency. But then hp is useless if you can't reliably and consistently extract it from the engine.

The reason I would prefer the OMI system over the carb smart is that it is dead simple and reliable. The carb smart is one more electronic gizmo and servo to tote around in the model and to fail on the nicest day of the year to fly. I'm NOT saying the carb smart is inherently unreliable. I am saying that gizmos left off the model can't fail <g>.

The Viperhead improves the cooling of the OS 91. It also noticeably improves smoothness in hover. The ideal plug combo has a slightly cold plug like an OS A5 or Enya 4 in the central hole and a hot plug like and Enya 3 or OS 8 in the angled hole.

Ben Minor

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12-02-2007 02:18 AM  9 years agoPost 8
bosshoss

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Chicago, IL

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Is there a website or contact for OMI, I would like to give them a call.

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12-02-2007 03:21 AM  9 years agoPost 9
montarok

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Brooklyn, NY

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http://www.oneals.com/Omitro.html

Very reliable dude...

------------------------------------
www.carifuna.com

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12-02-2007 03:32 AM  9 years agoPost 10
bosshoss

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Chicago, IL

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Thanks , I will be calling on Monday.

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12-02-2007 05:21 PM  9 years agoPost 11
Dr.Ben

rrMaster

Richmond, VA, USA

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Yes, lord, call. Do NOT email. James doesn't do much email. He's easy to reach by phone and nice as heck.

Ben

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