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Century Helicopter . MTA Hobbies . Model Rectifier Corp

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Gasser Model RC Helicopters > spark plug gap???
 
 
Naomi
Elite Veteran
Location: Ontario, Canada

Some good reading tonight.. enjoy you're all quite welcome.

Naomi
06-10-2003 Over year old.
HOMEPAGE  
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Thanks for the info Naomi.I went to Napa auto parts and found out that the NGK BMR 7A plug is discontinued.It is under a new number I ordered 2 of them.Another store had some BMR 6A's anyone use these?When I Pick it up tomorrow I'll post the number for it.
06-10-2003 Over year old.
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Don't bother

The BMR 7A order number 4226 will not fit the rc230 engine.CMR 7H is what came with the engine so I guess CMR is the size that will fit but what heat is 7H.Should I be looking at a CMR 7A or just use the one that came stock.
06-13-2003 Over year old.
 
 
Naomi
Elite Veteran
Location: Ontario, Canada

Bring them back. and exchanged for the CMR 7A.. if they have them. just bring along your stock spark plug along.

Naomi
06-13-2003 Over year old.
HOMEPAGE  
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

I'll exchange them tomorrow.In the mean time i found out how to read spark plugs.
check it out.
Field one: Thread Diameter
A 18 mm
B 14 mm
C 10 mm
D 12 mm

Field two: Construction
C Hex size 5/8"
K Hex size 5/8" with projected tip (ISO)
M Compact type
P Projected insulator type
R Resistor
SD Surface discharge for rotary engines
U Semi-surface discharge
Z Inductive suppressor



Field three: Heat Range
2 Hot
10 Cold

Field four: Thread reach
E 19 mm
F Tapered seat
H 12.7 mm (1.5")
L 11.2 mm (7/16")
** If this field is blank, an 18 mm diameter plug has 12 mm reach; and a 14 mm plug has 9.5 mm (3/8") reach.
06-13-2003 Over year old.
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Any body know the thread reach of a CMR 7A?Is it 8mm
Does reach play a big part in the running.I have the right heat range 7 but the reach on the 7H is much longer than the 7A.
06-13-2003 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Yes reach plays a part in how it runs. I would put the extended reach back in.
06-13-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

The "performance" resistive plug which I run in all my G230s (in helicopters) is:

CR7HSA

This is also the plug Vario recommends

So if you can not get hold of them contact your Vario dealer
06-13-2003 Over year old.
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Thanks Al.I'll stick with the H reach but is the 7 heat alright?Now to find a place that sells them Hmmmmmm Which place would be more likely to have these an auto parts place or a Bike shop?
06-14-2003 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

I would stick with the 7's.
06-14-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

Is my post invisible

If Vario recommend the CR7HSA Why don't you blo**y use it instead of wasting time on plugs that probably won't work
06-14-2003 Over year old.
 
 
Naomi
Elite Veteran
Location: Ontario, Canada

My stock RC230 came with Champion RZ7 works fine for me. Not changing unless it's necessary.. works great!.. could buy a few spare one just in case .. not that expensive.

Naomi
06-14-2003 Over year old.
HOMEPAGE  
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

If Vario recommend the CR7HSA Why don't you blo**y use it instead of wasting time on plugs that probably won't work Dave, can you explain why THIS plug is so much different/better?
06-14-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

I am not an expert on gas engines so I can not say that the CR7HSA is the best.

But, TVAILLANCOURT is asking some basic questions so instead of wasting time and money on plugs that are obviously wrong why dosen't he use a plug that the maunufacture of his helicopter (Vario) recommends

The CR7HSA is a NGK plug which I Personally think is better than Champion. The reach of the plug is correct for the G230. It is a resistive plug which should be used in RC applications to cut down the risk of interference and the heat rating seems to suit the motor.

I know this plug works well so I will not use any thing else - personally.

If I spent a lot of money on a car I would use the recommended plugs
06-14-2003 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Thanks Dave, but the difference between the two, compact or not, is not really worth him changing. I use the NGK BMR's, because that's what fits my G23's. They are really all the same plugs (as far as the motor is concerned), just different physical dimensions. I agree with you on the Champions, never cared for them other than the fact they are cheap.
06-14-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

I agree, He has no real reason to change, BUT the original plug is not a resistive plug - CMR7H

If he gets interferance, then, maybe he should try the CR7HSA which is basically the same plug but with the resistor built in.

Any way the weather is good over here for once so I'm going flying Speak Later
06-14-2003 Over year old.
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

I really don't have any reason to change the plug now that I'm informed about spark plugs,The CMR7h is a compact type resistor plug in the 7 heat range.I was on a search for plugs based on an artical by Billme.The artical was written for the old style G23puh engine which uses the BMR 7 a series plug.I was unaware at the time of the search that the plug diameter was not the same.So too all those who have contributed to this,thanks very much.

Dave Hollins
I don't recall reading anywhere in my Benzin kit or Manual a VArio recomended plug type.
I'm not having any interference of any kind and the engine and heli perform beautifully.I just wanted to make sure I had the correct plug for heli application.Sorry that this had to turn slighlty ugly but then again most post do

I will look around for the CR7HSA "the Vario recommended plug"
06-14-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

My mistake, I was told that the CMR plug was not resistive. But your right it is. I have both plugs and have checked them:

The CMR7H has a resistance of 11.4 Kohm
The CR7HSA has a resistance of 5 Kohm

Also the CR7HSA has 1mm more reach, the thread is the same but the electrode sticks out further.

The only plug that is in the Vario catalogue is the CRS7HSA

If you are not having any problems I would stay with the CMR7H
06-15-2003 Over year old.
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Thanks Dave.The only plug I can find in my catolog is the BMR 7A but then again I don't have the latest catolog.The last one I have is 02 with the orange Huey on the cover.I think the latest Catolog is #12 I don't know when they will be available here in Canada.
06-15-2003 Over year old.
 
 
Dave Hollins
Senior Heliman
Location: UK

The new catalogue # 12 is at the translators in Germany - over 500 pages. Hopefully should be soon. I have the German version.

They no longer supply the G23 so the BMR plug is also no longer in the catalogue
06-15-2003 Over year old.
 
 
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Gasser Model RC Helicopters > spark plug gap???
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