I'm looking to get a new engine for this year in my 8ight 2.0 buggy. I'm trying to decide between the S5, S7, or WS7. I have an RB 2045 pipe and 192 header that I would like to use, but I would buy a new pipe if the engine choice called for it.

I'm still fairly new to nitro so I'm looking for durability and reliability first and second, performance would be third on the list. Most of the tracks I'll be racing on are medium to large - for example The Farm 2 is a few miles from my home and will be open for club races this year. That of course is the largest track I'll be racing on, with the others going down to about half that size.

I would really like more low end which makes me look to the S5, but I wonder if that will have the pull on these bigger tracks. Better fuel milage would be good too, I'm not a great driver so if I can make up some time by getting one less pit stop I could use that help.

My first nitro engine was an S7 (older model) that I bought used with about 3 gallons on it. I put on another 4 without hardly ever touching the tune and that durability and ease of tune is what I loved most.

So I guess what I'm asking is what model do you think is best for me? The price difference between the three is neglible to me, although cheaper is always better. What pipe and plug combo works with each model would be great information too!

Side question - I've heard ceramic bearings are a good improvement. I was considering swapping both bearings for TKO ceramics after about a gallon of break in, any pros or cons to that?

THANKS!