Sport 20 Engines
- Thread starter TomGracey
- Start date
Help Support Intlwaters:
Bradley Maglinger
Well-Known Member
- Joined
- Sep 23, 2012
- Messages
- 1,868
I have ran my CMB stock for 3 seasons with excellent results with 50% nitro.
TomGracey
Well-Known Member
- Joined
- Dec 5, 2018
- Messages
- 466
I'v always been a CMB guy Have a Rossi. 21 on a B mod tunnel hull.
The 1 Rossi .67 Top I had in my old Bud T-6 through a rod twice taking out the liner and piston But in back together with the latest updated rod, piston and liner and sold it off. I even had the crank balanced after the 1st blow-up and that didn't fix the rod issue. Rossi's are great engines but that left a bad taste in my mouth.
Other guys swear by them. maybe I'm just cursed
The 1 Rossi .67 Top I had in my old Bud T-6 through a rod twice taking out the liner and piston But in back together with the latest updated rod, piston and liner and sold it off. I even had the crank balanced after the 1st blow-up and that didn't fix the rod issue. Rossi's are great engines but that left a bad taste in my mouth.
Other guys swear by them. maybe I'm just cursed
Last edited:
- Joined
- May 28, 2004
- Messages
- 4,301
Tom
CMB beta is what I have in my sport 20 a strong engine.
Dave
CMB beta is what I have in my sport 20 a strong engine.
Dave
Samuel Hagan JR
Well-Known Member
- Joined
- Jul 18, 2010
- Messages
- 4,673
I’ve ran a CMB Greenhead Valvola for about 4 years. Great motor. Going to upgrade the internals with the new Beta parts. I recently purchased a Nova 21DD. Looks fantastic on the inside. Haven’t ran it yet.
- Joined
- Mar 7, 2007
- Messages
- 3,815
Gotta stock Mac in mine.....love it!!
- Joined
- Dec 3, 2003
- Messages
- 3,344
Sam,
Remember if you put the N/R in the same boat that you have the CMB The N/R is a little over 2oz more weight , that may mess up your balance,it did on my 21 hydro
Walt Barney
Tom,
Both the CMB Beta Evo-21 and the Novarossi DD-21 are both Very Good Motors.
Some think the Beta Evo has a little more RPM, and others believe the DD-21 has
a little more torque for better propeller selection. In my opinion, and I own them
both it would depend on the weight of the boat. There may be some advantages
to having the DD-21 in a Sport 20 boat because of a little extra motor weight.
The set up and CG are very important, and the Sport 20’s tend to get a little light
in the front end and want to fly, so a little extra motor weight may help towards
the end of the fuel run. I still think the MAC-21 is a great motor with the angled
backdoor on the engine.
Have fun testing!!!
Mark Sholund
Both the CMB Beta Evo-21 and the Novarossi DD-21 are both Very Good Motors.
Some think the Beta Evo has a little more RPM, and others believe the DD-21 has
a little more torque for better propeller selection. In my opinion, and I own them
both it would depend on the weight of the boat. There may be some advantages
to having the DD-21 in a Sport 20 boat because of a little extra motor weight.
The set up and CG are very important, and the Sport 20’s tend to get a little light
in the front end and want to fly, so a little extra motor weight may help towards
the end of the fuel run. I still think the MAC-21 is a great motor with the angled
backdoor on the engine.
Have fun testing!!!
Mark Sholund
