Is it possible?

[taterflames22]

My question is: Is it possible to convert a combustion cannon to a hybrid?

[Ragnarok]

It very much depends. The original design and materials of the cannon will affect whether it is either possible, or safe to do such a thing.

Without seeing the cannon, we simply cannot know - but yes, in some cases it would be possible.

[jackssmirkingrevenge]

Yes, if you add a filling valve for compressed air and some sort of fitting - threaded/cam-lock etc. - between the barrel and the chamber to hold a burst disk. Also, your chamber has to be able of resiting the increased pressure.

You might also want to decrease your spark gap.

[ALIHISGREAT]

unless your combustion is of metal construction, i would say no...

its best to start from scratch and build a safer purpose built hybrid.

[CasinoVanart]

unless your combustion is of metal construction, i would say no...

its best to start from scratch and build a safer purpose built hybrid.

I totally agree, i was going to convert one of my larger metal combustions to hybrid but realised how unsafe it would be. If you were going for 1x maybe but then why bother.

[Ragnarok]

That really depends. Personally, I wouldn't be too concerned using something that was designed, and (well) made as a combustion at a 2x mix, assuming decent materials.
Wouldn't really want to go any further with PVC, but that is still a hybrid mix.

With that said, I would still be wary, and would want to do a fairly decent check of the cannon before entrusting it with that (and the first few shots would likely be remote fires).