xXxCellARatOr

im interested in getting one of these and its quite confusing. first off, the .12 is more expensive than the .18. even though the .12 has less power than the .18, it revs quite a bit higher. So my question is. Which is the better engine, and what is the difference between them? im not looking for so much acceleration, however i wouldnt mind more top speed. So would the .12 be faster in this departement? Also, i can't find the .12 on the O.S. website. why is this? is it a brand new engine or a discontinued model? thanks!!

silverj

http://www.osengines.com/engines/osmg1986.html

This is on their webpage!!

xXxCellARatOr

yeah but i am talking about the CV-R models. the .12 CV-R is a different engine than the TG. here is a link to my LHS:
http://www.hobbyhobby.com/store/prod...roducts_id=311

ferrarimk13

http://www.osengines.com/engines/osmg2010.html the the .12 and .15 are just called the CV, not the CV-R. Im not sure if theres a newer model out, but even if it is, go with the .18

TM323

[link=http://www.osengines.com/engines/osmg1995.html]what about me[/link]
these are probably faster in the top speed catergory then the rest of them. I have a 18cvr with the purple pinions and my buddy has a tc3 with the 12tz in it and WOW!! Now on a track I can smoke him because of acceleration but in a drag race he will shoot pass me in first gear his shift point is set so high we have to go to a mall parking lot just so he can shift to 2nd.

So if you want top speed get a .12 anyone will do really. I love the 18cvr because of the power and the price.

ferrarimk13

well, u can gear an .18 to get a better top end, but it just rips out of the hole.

TM323

I am in the process of rebuilding the RS4 with the red pinions to get some more top end. I have just been so busy. what is the max top end gearing that will fit

ferrarimk13

what motor?

xXxCellARatOr

yeah the CV models are still different than the one that my local hobby store has. they have the CV models as well, but they also have the .12 CV-R models, which is weired because no one seems to know of these engines and i cant find them anywhere else, nor on the O.S. website.

TO TM323: What is the general rule? You mentioned that any .12 will have high top speed. so would the same model .12 be faster top speed than the .18. because i know the TZ models are insane, but they are also double the price and have as much power as the .18 CV-R while still getting up to some crazy revs. Plust the TZs are turbos. So im not sure that it wil be the same case with the .12CV-R. What do u think?

xXxCellARatOr

P.S. when comparing any of the engines i am talking about them using the same Gear Ratios, since i wont be changing any of that stuff.

ferrarimk13

if you're not gonna change the gearing, then go with an .18 because it has the power in both low and high end. Im supposedly getting an 18TZ which is definitely more powerful than the .12TZ, and can probably go faster than it, thats why they dont run .12s and .18s together

xXxCellARatOr

I dont quite understand that last part. What do you mean they dont run .12 and .18 together? Where? u mean in a race?

psiturbo

A .12 its like a B18C5 and a .18 is like a 5.0.

It depends on your style of driving, I got a .26 Sportwerks engine on my On-Road application; its sick on acceleration and sometimes too much so its hard to drive.

What happens with too much torque is its difficult to control on turns and hard acceleration so sometimes its worst as the powerband is not smooth.

I have another bashing engine on my On-Road 1/8; a .21 OS RG... this engine is less powerful than the .26 but its smooth on acceleration. I prefer less power in my setup as I can be more time on the throttle throughout the whole straight line, beginning of the turn, during the turn and coming out of it. I tell you its an amazing feeling when the car just shreds on the turns instead of out of control do to much punch from the engine. Before I forget, the .21 has much more top end specially with the proper tuned pipe.

Remember also, my .21 consumes less fuel than the .26 and thats a good thing.

ferrarimk13

yeah, in a race, they dont race together because it wouldnt be fair, everyone knows that .18s get much more power and a lot of torque, a .12 revs high, so it can go just as fast, but it takes longer to get there.

xXxCellARatOr

ok, thank you guys, that makes things alot more clear. so at the end of the day, the top speed between a .12 and a .18 would be pretty much the same. With the .18 still being a little faster, but with tons more acceleration. correct?

psiturbo

No...

Because its a bigger piston and rod, the bigger displacement does not mean is going to be faster.

You have it all wrong; why have so much torque and acceleration if it cannot be controlled?

Install a Hemi engine in a Ford Fiesta, whats goin to happen? A ridiculous amount of power that cannot be transfered to the wheels.

In fact; I use to have a .12SS engine and it was much faster than many .18... Why? Because it was more effective to put down the power to the pavement, power to weight ratio.

Like I said; my .21 engine is faster than the .26, but the .26 has more torque. I only like the bigger displacement when I am in the mood of all out R/Cing and just blasting the R/C car like a rookie.

That is why many truckers love the bigger displacement; .27 / .28 engines, but it also hasd its limits. Many will bring up the issue of broken diffs, snapping axles, tires stupidly ballooning and many end up selling the monstruous engines and going down on displacement. Look at the Revo 3.3, its one of the smallest truck engines, but it can keep up with the pack.

xXxCellARatOr

I see what your saying. i was just assuming that the .18 would still have as much top speed as the .12 while still having lots more low end power. So in this case, what do u think would be more well suited for my on-road? its a Nitro RS4 which currently has the original .15FE engine with an O.S. carburator and the better cooling head. I also have a plastic tuned pipe on it.

ferrarimk13

[X(] get that pipe off there! thats whats holding every engine u have back, that pipe sucks, and it doesnt do much, just take the exhaust to the side of the car. Get a tuned pipe before u get any engine, itll be much bettre, and i still say go with the .18, u can get everything out of it. Its like the difference between a 600cc motorcycle to a 250cc.

xXxCellARatOr

Yeah ive decided that i am actually going to go with the .18. But what's wrong with my pipe? I dont have the stock pipe on it, i have this one: http://www2.towerhobbies.com/cgi-bin...&I=LXTB49&P=ML

ferrarimk13

that is the stock pipe, and it sucks honestly. Ur getting very little of the performance of the engine from that pipe, because A.) its plastic B.) its not tuned and C.) they just stick it on there, so the exhaust has somewhere to go.

xXxCellARatOr

yeah i know that pipe isnt all that great. but it isnt the stock pipe (since this is the old RS4 RTR - belt driven) and they also say that it is a Tuned Pipe. in any case, what kind of pipe do u recommed getting? what is a good Aluminum Tuned pipe for arround $40. thanks!

ferrarimk13

http://www2.towerhobbies.com/cgi-bin...?&I=LXCPX4&P=7 this one works fine, and it performs great too.

xXxCellARatOr

I see. thanks for the help.

ferrarimk13

if u dont want to change it, u dont have to, its just my opinion, with a new motor, u cant tell the difference between pipes unless ur a seasoned driver/racer, so u dont have to worry about it.

xXxCellARatOr

Yeah, i dont race what so ever. But i do intend on getting an aluminum tuned pipe when i get the new engine. i have a question, as a little heads up. At arround what temperature would a .18 cv-r run at? Im asking this because i dont know why but my 15FE with an upgraded HPI cooling head generaly runs at 250 without the body, and can go up to 300 with the body on. And i did cut out very large whole in both the front and the back, and cut out the side window. What do u think?