any input on which .15 engine for SSC, OS-TT-Magnum, is there any difference

Bronco:

Magnum. Great engines.

OS- overpriced, Magnum is its equal and less expensive.

TT - no experience, can't comment.

Bill.

Magnum = Great engines, put fuel line over high-end needle valve to prevent migration and leakage. Has ball bearings so it may live longer than non-ball-bearing engines.

OS = Great engines, but the LA version (the only OS .15 SSC legal) is not a ball-bearing engine. Runs good out of the box, took a little longer to break in and reach peak potential than my Magnum .15

TT = My .40 is a great engine on my Quickie 500 Viper. Lots of power, nice idle, easy to set up. Long break-in, but that may just be me since I was going to be racing it. I cannot comment on their .15's though, and some things do not carry throughout all engine sizes even with the same manufacturer.

Hope this helps,
Will

One other option to consider is the Megatech .15. Dual ball bearing engine that looks oh so surprisingly like the OS .15 CVA . The CVA uses a dual needle valve whereas the Megatech is using an OS single needle valve which is a million times better than the magum carb/needle so you don't have to worry about leaks in the needle and fuel tubing fixes. All this for $49.99....don't look at the Horizon Hobby site since they charge the suggested retail. All other places I have seen charge $50, thus SSC legal.

Bill Davis
Manassas VA