C5 vs Novarossi S421B

[flash183]

Both the C5 and Novarossi S421B look very fast. Any thoughts on which one is better?

This is going in a Inferno MP 7.5 =devil

 

[DickemDown]

i don't know about the nova, but i've have a c-5, and it flat out rips. however, it depends on the kind of track you run. if it's a short track, you might not maximize its top-end. if you're a basher into top end, then this is the one for you.

i run a c-5, ws7, & ws72. i interchange all three motors between my hyper 7 and my mbx5. the last two motors seem to be better suited for the tracks i race on because the straights aren't too long, and you need more bottom end to clear the big gaps.

 

[flash183]

Originally posted by DickemDown
i don't know about the nova, but i've have a c-5, and it flat out rips. however, it depends on the kind of track you run. if it's a short track, you might not maximize its top-end. if you're a basher into top end, then this is the one for you.

i run a c-5, ws7, & ws72. i interchange all three motors between my hyper 7 and my mbx5. the last two motors seem to be better suited for the tracks i race on because the straights aren't too long, and you need more bottom end to clear the big gaps.

That goes along with everything I've read about those two engines (C5 and WS7II). I'm leaning more towards the WS7II because the low end power is more suited towards racing. When you race with the WS7II do you change the gearing in your buggy at all? How do you like your MBX5?

 

[DickemDown]

Originally posted by flash183



That goes along with everything I've read about those two engines (C5 and WS7II). I'm leaning more towards the WS7II because the low end power is more suited towards racing. When you race with the WS7II do you change the gearing in your buggy at all? How do you like your MBX5?

i think you'll really like the ws72. when it first came out, people were complaining that they liked the ws7 more. after running both for awhile, i favor the ws72. the power band seems to be better. however, for low down grunt, the ws7 has it. last weekend at kz (which is a pretty good sized track with a long back straight), the ws7 was pig compared to the ws72. oh yeah, in my 1st qualifier, the ws7 ran out of fuel, and it was only 6 minutes. i haven't figured that one out yet. i think maybe my pit guy didn't fill me up - might have to fire him. anyway, i switched to the ws72, and it had alot of power, good bottom, and i didn't run out of gas.

about the c-5, no matter what clutch setup i tried, it just didn't seem "fast" on the track as compared to just bashing at the park. i would pull on the straights, but would get reeled in the tighter sections.

gearing, i don't change. i think a 13 tooth is sufficient for the tracks i frequent. i'll spend time tuning the engine, or just switch between engines, depending on the power band i'm looking for. the next thing i'm going to start messing with is different pipes & headers. right now, i've been satisfied w/ the ofna 053 (midrange) pipe & a waller power adaptor.

mbx5? love it. it builds easily. very durable and highly tunable. i still drive my hyper 7, but it's easier tuning just one chassis. the biggest difference between my two rigs is weight - i added all the paul coleman upgrades, and it's built like a tank. one reason i went with the mugen factory parts vs fioroni or racer's edge was i wanted to maintain it's lightness, but strengthen some areas. i may try the fioroni stuff later, but for now the mbx5 is fine.

another thing too, there are alot of guys running the mbx5, and it helps picking their brains for setup. kinda like the tc3 to 1/10 touring car.

last thing, i saw chad bradley serving it up. his x5 was dialed. it has a ton of steering, yet the backend doesn't wanna step out. his setup is a good baseline, and i just saw a copy of his gas nats setup. i'm trying that one next.

 

[flash183]

thx

Very cool, thanks for the advice. After doing some research I've been very impressed with RB. Rody actually takes the time to answer questions on their site. That's good customer service! I haven't found many places that sell RB products though. unlimitedengineering.com has the ws7ii for 282 plus shipping. it seems like a good price. they don't have any of the pipes or manifolds in stock though.

Any tips on breaking it in?

 

[DickemDown]

unlimited engineering is a good place to buy. i bought my ws7 from him, and no complaints.

breaking in? all suggestions are debateable. there was another thread that i had posted (on this bbs) about rb's break in techniques, but someone posted after me that "The most knowlegable people all agree not to break in the engine at idle and super rich. The OS web site says it is the worst thing to do." i'm sure os has good engines, but i'll stick to rb. it's cool, i wasn't offended. rather than double posting, check this out, this is my break-in technique :

https://www.rcnitrotalk.com/forum/showthread.php?s=&threadid=12690

here's the link to rb:
http://rbproducts.com/rbww/ubb/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=4;t=000096;p=1

again, this is what i have experience with, and what i can comment on. for whichever method you decide to break in your motor, just make sure you take your time, your engine will last longer between rebuilds.

lastly, your best deal for a one piece pipe/header combo are the ones from ofna. you can get an 063, 053, or 086 pipe w/ header for 44.95 from ultimatehobbies.com & nitrohouse.com will match that price.

fyi:
063 = bottom end
053 = mid range
086 = top end

good luck. i'm glad i can assist.

 

[FlyinRazorback]

Doubt you're going to find much info on the Race S421B yet. It is scheduled to be released in a week or so. With it being an 8-port, I would think it would be more of a top end engine, but it's a long stroke so it should have plenty of bottom as well.

Also, they are coming out with a 5 port short stroke (BS21B) which they claim has a more linear power band.

Unless you need an engine right now, I would hold out for a month or so to see what these new engines are like.