ORIGINAL: 2MuchThrow
ORIGINAL: Bax
Please remember that the Tower .46 engine is non-ringed, and can be ruined if it's run too rich.
[hr]
Really?
Whys that?...never heard of that. How can the engine be ruined...I thought it would just 4-cycle and virtually all the break-in manuals I have (I admit to not yet owning a Tower but I have lots of OS) experience says run them rich and lean intermittently. Does it cause to much pressure on the head or something because you get unfired fuel as an uncompressible liguid instead of a compressible gas? Thats my guess..but I'd like to know if I'm right. And, if that is the case, not sure what rings would do to solve that issue.
ABC/ABN/AAC engines need to reach a certain temperature to get the proper piston/sleeve clearance. If run too rich, the sleeve doesn't expand enough and the piston is too tight in the bore. This will ruin the engine. A search for ACB+ Break In should turn up a few pages of posts on this.