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Old 12-30-2007, 04:38 AM   #1
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Unhappy Blown Plugs

I've just finished running in an OS Speed Spec II and I have started experiencing a spate of blown plugs (P7). Each new plug would last only one run. Does any one have any suggestions as to what could be the cause. I've also stripped the engine down and given it a clean, no signs of any contamination was found. Any suggestions ......

OS Speed T1201
Futaba 4PK 2.4Hz
Serpent 748 TQ
M16 Racing Fuels
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Old 12-30-2007, 05:00 AM   #2
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Blownplugs can have several causes:

- to high compression (what is very unlikeable with a new engine)
- dirt in the engine (from outside or inside)
- to lean (maybe the best cause)
- bad fuel or to high nitro content.
Speed is only fiction but a 130+km/h MRS4 is for real.
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Old 12-31-2007, 03:37 AM   #3
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Possibly a damaged con-rod?
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Old 12-31-2007, 11:18 PM   #4
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consider adding a copper shim .05 to the head button and richen-up the motor on the top end 1/8th of a turn. keep your temp at 210 degrees or so.
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Old 01-01-2008, 01:49 AM   #5
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your conrod needs changing. install a new one
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Old 01-01-2008, 08:43 AM   #6
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Originally Posted by TomB View Post
your conrod needs changing. install a new one
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