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Old 12-25-2011, 01:41 PM   #1
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Default Nitro engine tuning help

Hey everyone

I got an hpi rs4 evo+ and have a question regarding the tuning of the engine

-i broke the engine in per manual instructions and tuned it after break in the car ran perfect

Next day i go to start it and didnt start right up afterit started when i applied throttle it died out i tuned the needle back to factory specs and still having the same issue

Any help would be great

Thanks!!
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Old 12-25-2011, 05:20 PM   #2
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Quote:
Originally Posted by Nismotunr View Post
Hey everyone

I got an hpi rs4 evo+ and have a question regarding the tuning of the engine

-i broke the engine in per manual instructions and tuned it after break in the car ran perfect

Next day i go to start it and didnt start right up afterit started when i applied throttle it died out i tuned the needle back to factory specs and still having the same issue

Any help would be great

Thanks!!
http://www.beachmumsracing.org.au/fyi/santalovesnitro/
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Old 12-26-2011, 03:40 AM   #3
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Replace the glowplug.
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Old 12-26-2011, 08:29 PM   #4
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trow to river
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Old 12-26-2011, 09:49 PM   #5
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Quote:
Originally Posted by Roelof View Post
Replace the glowplug.
Yep.. and when you have the glow plug out...

Do the following...

1) Crank over the engine and see if fuel A) Gushes, B) Mists or C) No sogn of fuel at all

A) Flooded engine

i) Too much Idle - Should be no more than 1mm gap on a small block engine
ii) Your bottom needle is too rich
iii) There's nothing wrong at all, your plug is dead and you flooded it, proceed to keep turning over engine without plug in and clear the plug. See B)

B) Misty mixture, perhaps a little rich but fuel mix ok. - Check plug

i) Inspect plug, coil should be shiny and complete.
ii) Put on a glow start and inspect glow if low it's cold, if bright it's hotter.
iii) Secure plug.

c) No Fuel

i) no fuel pressure from exhaust - check pressure lines
ii) no fuel from tank, check filters, fuel line
iii) Tank seal bad, leaking fuel pressure, leaky bad nipples, cracked tank.
iii) Check Carby idle settings - 1mm is usually a good starting point.
iiii) Check bottom needle [idle fuel pressure/mix]. Turn anti clockwise 1/4 turn
iiiii) Check top needle [overall fuel pressure/mix] - Turn anticlockwise 1/2 turn.
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Old 12-27-2011, 11:50 AM   #6
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Thanks everyone ill give it a shot and see what happens is it possible to keep the same settings or will they change from time to time ( weather or outside temp)?
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Old 12-27-2011, 02:17 PM   #7
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Take a look at these videos. Lots of good info on nitro tuning.

http://www.youtube.com/playlist?list...5&feature=plcp
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