tanman

Is anyone going to talk on here any more.


_____________________________________

Smartech cars rock!!!!!!!!!!!!!!

Timmahh

sure ill pipe in.... though it maybe hard to do, anything IS possible, if you have money to toss around.. We didnt get to the moon in the 60s cuz everyone thought it is just impossible! the CEN CT-5 is acclaimed to do 73 outtadabox... impressive. add a larger engine ( chassis is set up for it already ) mod the tranny and diff gears, im willing to bet 100mph would be just around the corner.... the MAJOR QUESTION IS, can you drive and CONTROLL it that fast without makeing a box of confhetti when you hit that cement curb at 100?
Tim

Saboteur10573

The Cen only goes that speed because it has a .15BB (big block) engine, which has about or near the same displacement as a .21 engine. That truthfully isn't a surprise to me. The gearing is also tall in order for it to achieve those speed. The real surprise is the engine...not common on the market, but it puts out enough power to get it there. Modding tranny and diff gears is easier said than done. Steve Pond of RCCA took months for his Super Nitro project to smash 100mph. Custom gears were made, single speed tranny, and the engine available isn't even produced on the market! [X(] Now that's exclusive.[8D] The whole thing is, that N4tec on ebay is just trash and no way in hell is going to even go 70mph with that setup. Just another person trying to take advantage of people in the hobby with little knownledge. That's just like a guy at my LHS telling a kid to get a turbo over standard since it gives you 5k to 10krpm more. LMAO...try 1k rpm and if anything it's a very slight difference.

ryan_t888

BB usually stands for Ball Bearing as far as I know. A .15 cu in. engine has .15 cubic inches of displacement and a .21 has .21 cubic inches of displacement. Displacement is the volume between top dead centre and bottom dead centre, not including the combustion chamber as the combustion chamber volume changes the compression ratio.

I don't understand why they call it 2.5cc (.15 cu in) if it has more displacement. Could someone explain?
IMO this engine is just a normal .15 inside perhaps in a bigger block.


Ryan

Saboteur10573

No, they do have ball bearings yes, but there is a .15 small block, and a .15 Big block. The .15BB can fit in the same mounting space as a .21 because the block is about the same size as well as the mounting dimensions. This is the reason why the .15BB, commonly used in the 10th onroad (235mm class) are capable of using .21 engines.

ryan_t888

How about the displacement of the engine? You said the .15 had more.(close to .21) I don't understand how .15cu in is equal to .21 in anyway. If they state .15cu in it has to be .15 cu in. or 2.5cc Please explain.


Also, I own this engine and it is called the Tower .15BB. I know for a fact that it is not a Big Block. Here is the crankcase.

http://www2.towerhobbies.com/cgi-bin...?&I=LXWV90&P=7

I just have never heard BB stand for Big Block before, maybe this is a new thing. Are manufactures now using BB in the model name to advertise "big block"? Everytime I see BB it always stands for ball bearings, especially airplane engines and servos

Ryan

Tigger N. Bennie

Is that the same Steve Pond at Kyosho? He is a pretty nice guy and is also entered in the Silver State Nitro Challenge coming up here soon. See 1/8 Pro.

http://www.outerlimitsraceway.com/sl...nfirmation.htm

Saboteur10573

BB ALWAYS stood for big block for engines. All engines come with bearings on the crankshaft...not bushing or anything else. If they did, they sure won't last long. I've made a mistake though the .21's do have more displacement, but share the same mounting sizes as a .15BB. Just remember there is a .15 small block, and a .15 BB...BB for rc engines= BIG BLOCK.

ryan_t888

Did you take a look at the link I had posted?

Is this a big block?
http://www2.towerhobbies.com/cgi-bin...?&I=LXAN90&P=0
It does have BB!

Also this engine has bushings:
http://www2.towerhobbies.com/cgi-bin...?&I=LXBY15&P=0
read the features part as many airplane engines are bushing only!

The reason I say this is because I bought a .15 size airplane engine. And I thought BB stood for Big Block when it actually explained it in the manual and on web that it stands for ball bearings. I was dissapointed but lucky to have an airplane engine with ball bearings as many are bushing only!

Ryan

DownStroke

That's the funniest thing I've EVER seen. It's bad enough that this guy would have the stones to try and sell a box stock 4-Tec that he claims will go 108 mph with a POS supercharger, but then there are idiots that bid the thing up to $610?!?!?! Man, are there a bunch of suckers out there! Where are they when I'm posting auctions?! Maybe I just need to throw one of those veg-a-matic suckers, uhhhhh, blowers on the cars and they'll magically be bid up to three times what they're worth. For the claim to hold up to scrutiny, the engine would have to run about 90,000 rpm LMFAO!!!! He admits to having the stock gearing in the car, and (here's the indisputable proof that he's full of it - the liar's lie about how fast cars will go) he had a cop (neighbor) radar the car for him. Ohhhhhhhh man my gut hurts from laughing at the stupidity of this one...

Saboteur10573

The difference is you are only thinking of RC AIR PLANE engines...I'm talking about RC CAR ENGINES! This is about RC cars, not RC planes...they're line up and make of engines are different in regards to names, displacements, etc.

engine geek

BB has always stood for a Ball Bearing supported crank . Many people have been mislead by "BB" thinking it meant Big Block when it doesn't.

I also own the Tower Hobbies .15BB(Buggy Engine) and this is not a big block. Tower Hobbies just used this to represent ball bearings. People get confused because ball bearings are used on all buggy engines but as ryan_t888 has stated not all engines have bearings. I have engines that are 7+ years old still working on original bushings.

I have found a dictionary on Tower for those who are confused with BB

http://towerhobbies.com/intros/introdictionary.html

As far as line-up of engines, they use similar block in their engines to save money. Usually they keep the same displacement increments like the popular .15. Some companies make engines for all applications. Prime example, O.S.

Saboteur10573

Ball bearings are used on .12s, .15s small block .15 big blocks, .21s, and .26s. Theres few that have bearings on the conrod, but most of them use bearings on the crankshaft. Still, there are small and big block .15s and both are entirely different in size and displacement. Tower claims it's a buggy engine, but it really isn't a buggy engine to begin with. It's just a simple .15 small block. .21s show true buggy engines as they have a longer stroke, larger heatsink, and slightly different piston that the onroad circuit engines. You can use a .12 in a nitro buggy or have it come standard and or a .15...call it a buggy engine, but it just isn't.

Saboteur10573

a .12


Displacement 2.09 cm3
Maximum power
1.56 hp
R.P.M. (M.P.)
41.300 rpm
Practical Range
6.000÷ 42.000 rpm
Bore x Stroke
13.80 mm x 14.04 mm
Ports nr.
3
Piston type
Microcasted
Crankshaft Ø 11.5 mm
Crankshaft Type
EFRA SG
Glow Plug Type Turbo
Exhaust Type Rear

a .15 SMALL BLOCK
http://www.osengines.com/engines/osmg2032.jpg

.15 CV 0.152
(2.49 cc) 0.598
(15.2 mm) 0.539
(13.7 mm) 3,000-30,000 0.68 @ 29,000 9.32
(264 g) 11.38
(322 g)

Now here is the issue...due to the fact that the 235mm (1/10th onroad) class is dead, there's very few companies who still make their .15 BIG BLOCK engine. RB still has theirs though...it's the RB X15. The SMALL BLOCK is the V15. Here is the RB V15

http://www.rbproducts.com/images/RB%...700-000735.jpg

and here is the X15
http://www.rbproducts.com/images/RB%.../01602-T-R.jpg

The V15 has 2.48cc the X15 has 2.49CC

These and other rc car engines (a majority of them) use bearings in the engine block..NOT bushings. Bushings are on the conrod. *edit for previous post* there are no bearings in the conrod. Either way..BB can mean ball bearing...AND big block..because that IS what they are! See what I'm trying to get at? Not many people have been informed and or just getting into the hobby..in this era where big block .15s aren't common. Notice the OS .15cvr..it's a small block .15 and not many places still have it. It's not even on the site! It's been replaced by the OS .18 versions. Nova stopped production of their .15 big blocks as well as .15 small blocks...why? No one used them anymore. Sedan is getting more popular and is currently as popular as 8th onroad. Same thing with Monster truck classes and 8th buggy classes. There's more of these than nitro stadium truck. Electric is a whole other thing, but for nitro it's a different story.

ryan_t888

Yes I know what you mean by small block/big block. Seen many small block/big block Chevy's, Fords in my day. I have never questioned big block/small block or asked for an explanation on this.

What I am trying to point out is using the acronym "BB" has confused 100's of people including me and it should not be used to represent big block. I have not even seen the acronym used in a model name for a big block yet. When you see an engine >.18 it is assumed that the engine is a big Block.

I believe engine geek stated that all buggy/car engines whatever you wish to call them have a bearing supported crank.

BTW where could I get that .12?
40 000RPM just blows me away. Insanity!
Ryan

ryan_t888

As far as the ebay stooge, someone should have said "I will give you $2000 for it, if you could prove it worthy of 105mph as it would challenge records in its class"

Ryan

Saboteur10573

Yes, unfortunately though as long as the .15 big blocks are still around...that will stick to them. Infact if I get a serpent 805 (235mm class) I'll bag that last Novarossi .15...unless they still make parts for it. That Novarossi N12LS3/N12LL3 is available at most hobby stores. It goes for about $300. The Tim Hottinger modified version is $50 more.

SqueedilySpooch

40 000RPM is just a dyno test at optimal conditions...those numbers arent accurate to the key as its impossible, its just for the buy value really. However, Nova's engines are nice indeed.

why did this guy have to revive some post on a car that has alrdy been bought??? He's just asking for ppl to bash at one another :P

Saboteur10573

Hehe, the usual bash-a-thon. Still though there are .12s and .21s that can rev to 40k with load.

silent_echo

i heard someone on here lookin for the supercharger u can get em at www.rbinnovations.com but i dont think theyre all theyre cracked up to be i just heard they make it a bit more powerful but u need to replace the sleeve piston and rob more often. kinda like running really high nitro content. waste of coin if u ask me

Saboteur10573

Most definately waste of $$. There are people who buy it and think it's kewl. I race...so I have no need for that junk.[8D]

Rs43EVOman

I dont get it if the CTS-4 uses a .15 BB, then why doesnt somebody get that, and drop in .21 race engine?? the engine it comes with is a Big block so a .21 should fit fine, and with the tall gears that thing has it would go scary fast.

Saboteur10573

Depending on the .21 used it will go "scary fast". Otherwise, a .12 or .15bb will beat it.

Rs43EVOman

Well if you can find me a .12 that is as fast as a good .21 then i would appluade you, the only way you could do it would be to get a high-end race engine and compare it to the crappiest .21. they just dont compare, the .21 can generate soo much more power simpllly becuase it has soo mcuh more displacment.

NitroRunner

Heres a question off of the ebay listing... lol
Q: I am looking into your r/c car and I have a few questions for you. Who makes the supercharger on your car? And what is the red thing on you exhaust? I was just wondering? Hey where could I get a supercharger for my car? Please email me back and let me know! Thanks, Mike
12-Feb-06
A: It is a ballon to cover the speed control - protection
Heres another...
Q: Is this a brand new car?
12-Feb-06
A: Yes, 7 tanks run through.

lol buddy doesnt know what hes talkin about, theres no speed control on a nitro car, as stated in his first answer. and if it has 7 tanks of fuel through it... then no, it isnt brand new... what a scam.