Slide Vs. Rotary Carb?

[egglick]

Hey guys. I've had my T-maxx for about 2 years now, though I'm still relatively inexperienced at tuning and such. I've only got around 2-2.5 gallons through the stock TRX2.5 motor, but since I haven't been using after-run (just WD-40) or keeping it completely clean (some external rust from grime), I don't think that it will last much longer.

Once my TRX2.5 decides to call it quits, I'm looking at something like a OS .18 (CVRX) as a replacement. I see a couple different carburetor options on new engines, and I was wondering......what the difference is between a slide-valve and a rotary carb??

As I mentioned earlier, I'm not the best at tuning, so that's something to keep in mind.

[Tex]

Welcome to the forums Kurt!

You want the slide carb as you have now to complete a direct drop in installation. A rotary carb on a t-maxx has issues with the linkage hitting the spur gear in a roll over.

Performance wise, the slide carb is supposed to be better in some way but I never noticed a difference. I've had both.

[RobH]

Originally Posted by egglick

OS .18 (CVRX) as a replacement

Excellent motor.


Here is the one you want for the 2.5 maxx:
http://www2.towerhobbies.com/cgi-bin...&I=LXGGP6&P=ML

They raised the price $10 because they have a sale going on.

You need this too for the clutch:
http://www2.towerhobbies.com/cgi-bin...?&I=LXJF69&P=M


Here is the header and pipe combo I use:
http://www2.towerhobbies.com/cgi-bin...?&I=LXAXN1&P=M
http://www2.towerhobbies.com/cgi-bin...&I=LXSP47&P=ML

Tower hobbies raised the price on that pipe too. You should be able to get one on ebay for like $15.

Heres some pics of mine:

[FreeRideFrosty]

Awesome setup rob and not at all pricy. That is about what I ran on my RC10GT. Hehehe... lots of power and ver reliable.

As for carbs... I have used both and if you set the linkages up right I have neer noticed a difference.

[UE-Maxx]

I have that engine in my maxx right now. Great engine.

Rob, do you still run the stock motor mount? I am guessing that that is an old picture.

[RobH]

Originally Posted by UE-Maxx

Rob, do you still run the stock motor mount? I am guessing that that is an old picture.

Old picture, I sold it to bottledbeast.... he probably broke it by now.

I now run the dace mount.

[egglick]

Thanks for your help guys. If the linkage on a rotary is going to have issues on a T-maxx, then I guess that makes the decision easy.

I was kinda wondering how two differ in power and tunability though....just for future reference. They're both the same price, so I figured there must be some minor tradeoffs.

[FreeRideFrosty]

Some say the power from a slide is more predictable as the opening always changes by the same amount but I cannot notice a difference. They tune the same from what I can tell as well. The only thing is that a better carb will hold a tune and be easier to tune than a cheaper carb...

[UE-Maxx]

Originally Posted by RobH

Old picture, I sold it to bottledbeast.... he probably broke it by now.

I now run the dace mount.

Me too.

[The_Thubbed_One]

A book would say that the airflow thorugh a slide carb is going to be easier because it's going staright through, versus having to go around both sides of the ball valve that a rotary carb uses. so the air has to do this _/- instead of this ----. Once the throttle is wide open, there is no difference. Hopefully my diagrams make some sense to somebody other than me.