Hey man there are quite a few engines available right now. RB has engines that range from entry level performance with a low price tag, to more expensive powerful race engines.

C6USA - If you can find one of these they are the most powerful RB you will find right now, tons of bottom end power and just as much top if not more than the standard C6. It is basically a C6 with a modified/balanced/coated crank, and a modified head button. I only run this in truggy as I find it to be too much power for my buggy on most tracks.

B9 - The B9 is just the 2009 model of the C6. They have the low center of gravity cooling heads and turbo head buttons. This is a great truggy motor if you can't find a C6USA anywhere. It is also a good buggy engine if you have been driving for a while and can use the power it makes without causing yourself more wrecks.

WS9 - This is the new version of the original S7 which was very very popular for a long time. It has always been a square stroke 7 port engine, so it flies on the straight away. These engines are still 7 port but they now use the MES exhaust porting which basically looks like there is 3 exhaust ports. It was originally designed for European tracks with wide sweeping corners and long straights. A lot of people that run these on US style tracks don't like the bottom end in a truggy so it is probably best in buggy. This is what I run in a Losi buggy and I run with a 50 tooth spur rather than a 48, this gives me the bottom end I need for any tracks I have been to as well as plenty of top end for the straights.

Buggy10 - This is brand new and revealed at the toy fair this week, I have not seen the full specs on the engine but it appears to have a few changes from the B9. I can see the new strengthened and coated crankcase, and a new cooling head. It is still a 5 port engine with a 14mm bi turbo crank. There may be some other internal changes made that should be announced shortly.

Cross10 - This is also a new engine they released at the toy fair. From the specs I can see it should be very similar to the Shark9 that was a limited edition engine. This also comes with the new designed crankcase but does not have the coating. It has the new design L2G cooling head as well. It is a 3 port engine with the 3 port MES exhaust porting. It is also a long stroke 14mm bi turbo engine.


K9/K10 - This is RB's engine that provides pretty good power at a low cost. These engines are not Novarossi based engines so will not behave and tune like RB's you have used in the past. These engines are manufactured in Taiwan. Not being Nova based you will probably not be able to get 10+ gallons of fuel out of it like the more expensive RB's in the lineup.

S9 - This engine is the original S7 from back in the day. It is a square stoke 7 port engine with a turbo crankshaft.

Hobby9 - This engine is basically the old S5 that was in the lineup. It is a 5 port square stroke engine with a turbo cut in the crankshaft. It has a standard plug and a low center of gravity cooling head. This is the engine I ran in my buggy when I first started racing, was plenty of power when I was new and was very reliable.

Junior9 - This is the Old S3 engine. It's a 3 port square stroke engine and probably the least powerfull engine in the lineup, would be a great engine for a young kid getting into the hobby.

Generally when you start leaning the LSN you are going to have to lower the idle as leaning the LSN will cause the idle to get higher. It's the opposite if you start to richen the LSN you will need to turn the idle up some. Sounds like when you are leaning the LSN the idle is carrying on and staying high which is making you think it's lean. back the idle back and you will probably be fine as you lean the LSN.

Thanks Chris Peralta, I loved my Ws7's. I may pay the extra dime and give RB another shot.

Does anyone know when the Buggy 10 is coming out. I would rather go with the B10 then the B9... need to be different

I've had my k9 for over 3 gallons now and like it alot.Mine still has pinch and occasionally gets stuck.I don't see this engine wearing out prematurly.I use the re10 pipe on it and get 10+ minutes on a tank.The jp3 also runs good.

just curious, is this in a truggy or buggy?
thanks

Can't say for sure but generally when they release a new engine at the fair it will be available shortly. Should be in plenty of time for the race season.

Has anybody ever had any experience using a pressure chamber between the exhaust pipe and fuel tank? After hearing about one and doing some research the idea seems to make since. It seems to be helpful if you are having problems flaming out after refueling stops do to over filling the fuel tank. I think we have all experienced flame outs after refueling at some point in our careers. I did experience a string of flame outs with my WS7III this past fall. Would fuel filter do the same thing?

I'm running it in a buggy now,but can honestly say that the k9 would pull a truggy just fine.The power band is a little smoother on the bottom than a v-spec but has just as much or more on the top.

ok. i was just wondering beacuse im looking for a good engine that will get close to 10 min in a buggy. so far Werks and RB is on my mind.

Honestly I think you would be better trying some extra fuel tubing on the pressure line and loop it around (try for a good 8 inches or so). With a chamber in there you have something that can come loose or develop a leak. Also the biggest reason these engines flame out after being fueled is your LSN is a bit too rich. You can also try running a #5 plug instead of a #6.

Thanks for the quick reply! I am fairly new to the hobby. 2 years racing buggies. I am hoping this will be my break out year! I am trying to cover all of the problem areas from the previous 2 years. Flame outs have been a problem in the past. As a matter of fact I switched to an OS V-SPEC for a while because of it. I still much prefer the power delivery of the WS7 III; Much easier to control! I have made the decision this year to go with the WS7 III; Thinking about buying a WS9. I have heard that RB’s are sensitive to glow plug heat ranges and prefer lean LSN settings. I typically do not tune using temp but more sound, feel, and smoke. I was thinking about trying an OD 77T or an OS P3. I have been seeing some negative post about the quality of RB and Nova based glow plugs. Seems to be a hot topic on other forms.

Are air bubbles of any kind acceptable in the fuel line? I get occasional intermediate pin head size bubbles I can see in my fuel line.

Don't try a P3 plug in the engine, they are tapered a little different that the RB/Nova plugs. I know they are very closeto the same plugs but I have never really had problems with the RB plugs but I have had problems when trying to run the Novarossi plugs. I have found I like the way the #5 turbo plug works best in my engines. As for the LSN, I wouldn't say they like to be lean you just want to make sure the LSN is tuned so that your engine isn't loading up with fuel while it sits and idles. Once tuned good you should be able to let the car sit still for a good 5 seconds then pull the throttle and the car should accelerate well without having to clean out a bunch of extra fuel first.

Also, generally you don't want to see any air bubbles in your fuel lines as these will cause you a lot of tuning issues.

Do you think the air bubbles would be coming from the fuel tank? I have replaced all of the o-rings and sealed the engine and replace all of the fuel lines. I run a RC8 and there are known issues with the fuel tanks.