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Old 03-15-2025 | 11:58 AM
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Zerodefect
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Joined: Apr 2008
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From: Columbus, OH
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Originally Posted by BenewahRCTeam
Can you please explain to me your break in process and what you mean... like stalling vs being shut off....or? I'm getting ready to do some servicing on a few engines, and possibly breaking in another one soon...

I go find a huge parking lot in an abandoned industrial park on a warm Sunday.

Heat the head with a heater for a half hour while I prep my gear. Multiple fuel bottles.

Wrap aluminum tape around the cooling head.

Dump fuel down carb, swish around. Roll flywheel untill piston is around BDC. Start car on the box forcefully. Too wimpy eats starter wheels. Keep it running with the throttle. Not idle. Maybe a tank or two. Leave glow ignitor on.

Then drive figure 8's with the head taped, and glow ignitor on. Engine may require constant throttle to stay running. Be ready for that. Do this for as much fuel as you feel necessary. Refuel on the box, while flipping throttle to keep engine running.

Lean car out a little and continue. Maybe remove ignitor. Use more speed and throttle.


Done right, engine won't need restarted throughout the run in process. Completely eliminating cold startup rod stress. Replace glowplug, it's shot. Then put a weak rich race tune. And start some practice runs at the track. Replace plug again as you put a race tune on.

The ficticious "heat cycle" can be done after the pinch had reduced to normal.

The time and fuel cost to do this, about equals the EBIS treatment from Drake. If I was completive at a higher level in nitrobuggy, I'd pony up and just get an OS from him.
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