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.
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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.
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egglick Wrote: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/wti...XGGP6&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/wti...LXJF69&P=M
Here is the header and pipe combo I use:
http://www2.towerhobbies.com/cgi-bin/wti...LXAXN1&P=M
http://www2.towerhobbies.com/cgi-bin/wti...XSP47&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:
![[Image: osready1.jpg]](http://www.unlimitedengineering.com/gallery/files/3/0/6/6/osready1.jpg)
![[Image: scratch.jpg]](http://www.unlimitedengineering.com/gallery/files/3/0/6/6/scratch.jpg)
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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.
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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.
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UE-Maxx Wrote: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. :p:
I now run the dace mount.
![[Image: mount.jpg]](http://www.unlimitedengineering.com/gallery/files/3/0/6/6/mount.jpg)
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Current: Nitro Traxxas Slayer Pro 4x4, Nitro Traxxas Slash
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.
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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...
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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.
:joy:
