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Old 01-19-2007, 11:54 AM   #1891
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I am about to break in a murnan +12 sct. I use 30% nitro, do I need to shim this engine out. If so, how much?
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Old 01-19-2007, 12:29 PM   #1892
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Quote:
Originally Posted by joemugen
I am about to break in a murnan +12 sct. I use 30% nitro, do I need to shim this engine out. If so, how much?
Since it is not a standard engine, and has been modified by Uriah I think you should ask him.

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Old 01-19-2007, 01:14 PM   #1893
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Originally Posted by joemugen
I am about to break in a murnan +12 sct. I use 30% nitro, do I need to shim this engine out. If so, how much?
Hi Joe. You should add one .1mm shim at least where you are. I believe the engine is still stock. If you only see one .3mm silver shim under the head, you should add a shim. I have ended up running .2mm above stock in Florida.
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Old 01-21-2007, 12:39 AM   #1894
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.1mm shim should be fine.
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Old 02-02-2007, 06:02 PM   #1895
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Default what plug for novarossi race .21 with 25%?

hey guys
wats a good glow plug for a novarossi race .21 running 25%
the engine came with a RB 6 plug so im after something same as that

thanks
John
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Old 02-02-2007, 06:12 PM   #1896
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Quote:
Originally Posted by mrgsr
hey guys
wats a good glow plug for a novarossi race .21 running 25%
the engine came with a RB 6 plug so im after something same as that

thanks
John
for offroad stay with the no. 6......

for onroad go with no.7
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Old 02-02-2007, 06:53 PM   #1897
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its for onroad thank you!
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Old 02-03-2007, 01:31 AM   #1898
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It really depends on the weather for that day of racing. Manufacturers include a plug to get you started with the motor, however it is expected that you change the plug according to geographic location, temp, humidity, etc.
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Old 02-03-2007, 01:49 AM   #1899
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Quick question

For very cold weather...... 6 deg C

Increase head clearance or lower?

Hotter plug or colder??

Cheers
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Old 02-03-2007, 01:57 AM   #1900
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Quote:
Originally Posted by ziggy12345
Quick question

For very cold weather...... 6 deg C

Increase head clearance or lower?

Hotter plug or colder??

Cheers
hotter plug.........7C ou 6F for .21 onroad........

and 5 for .12 onroad or .21offroad........

regarding the head clearance, I wouldn't change, anyway theoretically you should increase head clearance due to the higher content of oxygen in the air (lower the temp = higher the density of the air, which means you have a bigger volume of oxygen for a given volume of air compared to higher temps)...

you just need to run the engine rich, and this is why you need a hotter plug, to achieve a complete combustion...........
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Old 02-03-2007, 02:29 AM   #1901
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I think I'll try increasing the head clearance as the air is denser at lower temps so more compression. I'll see how it runs first but deffo on the No5 plug

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Old 02-05-2007, 12:01 AM   #1902
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hey guys i got a novarossi based max power .12 sl3 engine, it a awesome engine just the prob is it needs a change of conrod and i cant seem to undo the head, the head bolts are for a flathead screwdriver which is very unusal, has any1 encountered this problem and what did u use other than a screw driver to undo it got me stuffed cheers kosta
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Old 02-05-2007, 12:14 AM   #1903
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all nova based engines uses this philips screw. we all normally changed it to 2.5 socket head screw, as i have a very very bad encounter with this nova screw, as the head of the screw snap off, but luckily, it still show a tiny bit where i can use my fingernails to turn it out, phew, else, need to get a new crankcase.
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Old 02-05-2007, 12:55 AM   #1904
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Quote:
Originally Posted by uniquexme
all nova based engines uses this philips screw. we all normally changed it to 2.5 socket head screw, as i have a very very bad encounter with this nova screw, as the head of the screw snap off, but luckily, it still show a tiny bit where i can use my fingernails to turn it out, phew, else, need to get a new crankcase.
umm do u mean flat head screw
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Old 02-05-2007, 11:57 AM   #1905
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Quote:
Originally Posted by MaDaGAS CAR
hey guys i got a novarossi based max power .12 sl3 engine, it a awesome engine just the prob is it needs a change of conrod and i cant seem to undo the head, the head bolts are for a flathead screwdriver which is very unusal, has any1 encountered this problem and what did u use other than a screw driver to undo it got me stuffed cheers kosta
ALL Novarossi based engines have flathead screws. I don't like them much either. Make sure that you use a GOOD screwdriver with a not too small blade and apply it absolutely vertical to the screw.

Once you got them out, you can change them for hex head screws from Picco /Mega/LRP.
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