R/C Tech Forums - View Single Post - Shimming, nitro %, glow plug and timing
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Old 02-08-2007, 10:42 PM
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Ivan Dickson
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Originally Posted by rmdhawaii
I finally got a chance to thoroughly read Dennis Richey's article posted above and it is really awesome info.

Can anyone help me find tune this info into some type of procedure/guide? It may not be possible, but I sure would like to try.

1. Measure head clearance.

2. Based on head clearance, choose your nitro %: (Maybe thse should be ranges)

a) .36mm or less, use ??% nitro
b) .46mm or less, use 20% nitro
c) .??mm or less, use 25% nitro
d) .56mm or less, use 30% nitro

If you need to use a higher or lower % nitro, add or remove shims.

3. Choose your glow plug:

And this is where the fun really starts...

afm posted this a while back.


Is the opposite true?

- When the ambient temperature is low, we have to use a plug with thinner wire.
- With lower compression, we have to use a plug with thinner wire.
- Humidity determines if we use a Cold (F) thermal range, or Hot (C) thermal range.
- With low humidity percentage we should use a Cold (F) thermal range plug.
- If we have low temperature and low humidity, we should use a plug with thin wire and a Cold(F) thermal range.

Now there is also this info:



At this point clutch setting and gearing play a role - not just the fuel, plug and head clearance. What are the troubleshooting steps before changing any of the above?

- If your engine overheats:

Cluch/gearing?
Troubleshooting?
Engine Tuning?

- If you need more top end speed:

Cluch/gearing?
Troubleshooting?
Engine Tuning?

- If you need more bottom end:

Cluch/gearing?
Troubleshooting?
Engine Tuning?

- Not enough run time (< 5 min.):

Cluch/gearing?
Troubleshooting?
Engine Tuning?

- If you increase or decrease your nitro %

Go back to step 2 and adjust your head clearance
Great info. Thanks greatly appreciated
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