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Percentage of Nitro used in a Norvel, R/C BB engine Cox_ba12




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Percentage of Nitro used in a Norvel, R/C BB engine Empty Percentage of Nitro used in a Norvel, R/C BB engine

Post  Iceberg Sun Aug 16, 2020 11:35 pm

Hi Gents
Although 99% of my questions and flights are Cox related I do have a few others I deal with too. Might someone know what is a good fuel mix percentage of Nitro that would be used in a Norvel, R/C BB engine?

If anyone knows would be greatly appreciated.

Thanks
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Post  Ken Cook Mon Aug 17, 2020 12:57 am

What size? 5-10% nitro works just fine . 40% nitro is my standard combat fuel and I use it in my Norvel 15's as well.
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Post  Iceberg Mon Aug 17, 2020 8:09 am

Hi Ken
It is a Norvel .15 with Ball bearings never been started.
Nitro % best you think?

Thanks
Darren
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Post  Surfer_kris Mon Aug 17, 2020 11:54 am

About 10% nitro is fine, what is more important is the oil content and type. The cylinders are very rough when new, so for me it is all castor oil and 20-25% of it.

The stock engine throttles excellently (idles reliably at around 2200rpm) but the carb is a little restrictive on the high-end. So if you are after more power you can simply switch to a different carb, the MVVS .15 carb is a direct swap-in for instance. I wrote some of my findings on RCU quite some time ago, try a search there and you'll find lots of useful info.

Here is one of the threads on RCU, for instance: https://www.rcuniverse.com/forum/1-2-1-8-airplanes-70/9450797-norvel-15-big-mig-again-2.html

Here are my tach numbers from that time:

"Here are some numbers with the muffler on:

Stock carb, APC 8x4 prop, 10% nitro: 14400rpm
MVVS carb, APC 8x4 prop, 10% nitro: 15800rpm

With the MVVS carb the performance pretty hard to match by any other .15 engine, especially if you consider the low overall weight of the engine."
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Post  Ken Cook Mon Aug 17, 2020 12:02 pm

Do you have the spanner wrench for the head insert ? The design of this has changed somewhat over the years and the latest had a mill finish head clamp with peripheral holes around it. When new, due to heat cycling the clamp will loosen offering little to no compression. I actually put some Ultra Copper RTV around the threads and retightened and never looked back. This engine has a good deal of pinch when new and takes a bit of fussing with using a heat gun to pre heat the cylinder as it will lock up at top dead center.
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Post  Surfer_kris Mon Aug 17, 2020 1:09 pm

Yes, as with all Norvel revlite technology cylinders, lots of castor and preheat is the way to go. Once run-in they are very reliable and easy starting.
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