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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Boxermann on November 21, 2016, 07:02:58 AM

Title: Fill engine cavities
Post by: Boxermann on November 21, 2016, 07:02:58 AM

I'm removing the box that housed the AFM, and by that exposing the upper part of the engine. To make it easier to keep clean I'm thinking of filling the cavities marked in red with something. Steel epoxy?

Or would this be a bad idea because of heat?

Title: Re: Fill engine cavities
Post by: Laitch on November 21, 2016, 08:23:45 AM

Leave it alone and eat your dinner on a proper surface.

Title: Re: Fill engine cavities
Post by: Filmcamera on November 21, 2016, 08:53:57 AM

I cleaned out mine yesterday - years and years of accumulated crud was in there - I am pretty sure that can't help the cooling so I agree - leave them alone.

Title: Re: Fill engine cavities
Post by: kris on November 21, 2016, 09:07:41 AM

If you're worried about it why not consider some type of durable screening. That will keep small stones (and up) from collecting in there. Wouldn't be in a hurry to fill it. Even full of crud I can't imagine any real ill effects....

Title: Re: Fill engine cavities
Post by: Chaos on November 21, 2016, 10:10:24 AM

I doubt it has anything to do with cooling, probably the cavities are there to save weight.  I sorta like the idea of filling them in.  Epoxy would certainly work, though it would be a pain if you changed your mine. Bondo is the only other thing I can think of offhand and seems like that would crack over time. 

Title: Re: Fill engine cavities
Post by: The Mighty Gryphon on November 21, 2016, 10:15:52 AM

If you really want to fill them in, I would suggest using one of those foam caulks like Great Stuff.  Shoot it in, shape it, and then seal the surface by brushing on some polyester resin.  I wouldn't use epoxy because it tends to soften at high temperatures.

Title: Re: Fill engine cavities
Post by: Boxermann on November 22, 2016, 05:18:55 AM

Thanks for the input guys!

I think I'm going to your suggestion Mighty Gryphon. Cheap and easy to apply and no problem to remove if needed.

:2thumbup:

Title: Re: Fill engine cavities
Post by: BAMBAM1039 on November 22, 2016, 04:19:47 PM

FOAM chalks are highly flammable  caution with use   good luck  also bondo will not take the heat as far as i know

Title: Re: Fill engine cavities
Post by: kris on November 22, 2016, 04:32:41 PM

Cement??.............. :dunno

(just kidding)

Title: Re: Fill engine cavities
Post by: Nine80seven on November 22, 2016, 09:09:27 PM

Every 80K miles take stuff off top of engine, squirt some cleaner, brush, use rags, squirt some more cleaner, wipe clean possible, put back together, go to go another 80K.