Crankshaft rust

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Old 08-06-2013, 03:31 AM
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Default Crankshaft rust

The motor has a little over a gallon and this is what the crank looks like.
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Old 08-06-2013, 03:33 AM
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Default Crankshaft

.12 RBM3
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Old 08-06-2013, 03:45 AM
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Do you have a photo?
What fuel do you run?
How do you maintain your engine after you run/race?
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Old 08-06-2013, 04:23 AM
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Originally Posted by JOE SI View Post
The motor has a little over a gallon and this is what the crank looks like.
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I don't care what fuel brands say, you have to use after-run oil. I fell for that once and it cost me a set of engine bearings.
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Old 08-06-2013, 06:32 AM
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Originally Posted by godzukihop View Post
I don't care what fuel brands say, you have to use after-run oil. I fell for that once and it cost me a set of engine bearings.
+++1. I fell for the same line of BS. I always run all the fuel completely out. For a very short time, I didn't use ARO. I figured I was racing at least once a week and rust wouldn't form in less than a week in a controlled environment. That cost me a good engine. Rust can form overnight. If I'm at a 2 day weekend race, I still use ARO, for peace of mind if nothing else. I also take my engines apart every other race day to check for wear and staining, either carbon deposits or any spots of rust. Engines are to expensive to ignore.
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Old 08-06-2013, 09:39 AM
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I'm getting back into the hobby after 5+ years so I'm not sure what the best brands are now. Can you recommend a good ARO? Thanks.
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Old 08-06-2013, 05:49 PM
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Someone told me they're carbon deposits from blow back, not rust
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Old 08-06-2013, 06:02 PM
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Default Rusty crank

It's had it since 2 weekends ago but opened it this past Sunday again to see and it had 5x more rust or whatever that is
Attached Thumbnails Crankshaft rust-image.jpg  
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Old 08-06-2013, 07:24 PM
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Originally Posted by Mavs View Post
I'm getting back into the hobby after 5+ years so I'm not sure what the best brands are now. Can you recommend a good ARO? Thanks.
I buy my ARO from Murnan Modifieds.
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Old 08-06-2013, 07:37 PM
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Marvel mystery oil. Perfect after run oil Using it for years .. Or transmission fluid ....
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Old 08-06-2013, 08:05 PM
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GMK Supply "Afterlife" ARO. Marvel Mystery has been known to cause problems with silicone crank inserts.
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Old 08-06-2013, 09:11 PM
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Originally Posted by Gary NJ View Post
GMK Supply "Afterlife" ARO. Marvel Mystery has been known to cause problems with silicone crank inserts.
Gary. Never once in any of my engines ...
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Old 08-06-2013, 09:30 PM
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How would one clean up that rust on the crank?
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Old 08-06-2013, 11:01 PM
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Take out the crack. Push a small piece of fuel tube over the crank pin to protect and then with a Scotch Brite pad you can wipe it away.
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Old 08-07-2013, 04:30 AM
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I've been using Mugen after run oil.
But haven't done it on this motor yet and it shows. Just hope it comes right off and doesn't affect performance, its the fastest motor I own with plenty of power
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