Some "Tough" questions

[RustyBoltz07]

Ok, I got my act together over spring break and have really been getting deep into things for my Revo and Sirio.23 so I have some questions that I was hoping might be cleared up. :shrug:

1. How hot should my Sirio .23 be getting? I use a McCoy #9 plug and currently it runs in the range of 260-300 with by MIP saying peaks at 320
A. Are there any alternative plugs including options for turbo?
B. If too hot, should I reduce the compression, or consider a large head?

2. I've been using stock gearing and I mostly bash, should I consider a gearing change? if so what suggestions?

3. How do I check to see if the slipper clutch is correct?

4. My Revo takes a lot of trigger pull before it begins to move(stock), should I
A. consider racing clutch like the new Werks clutch http://werksracing.com/product.do?sku=WRX6501 or
B. Consider adding weight to the shoes and how or
C. get heavier clutch shoe
or do you have any other suggestions?

And soes anyone know the peak rpm for the Sirio .23, I read it in Rc Nitro but have long forgotten.

thanks for any help concerning any of the questions.

 

[jetmechG550]

Here goes:
Your temps are very high, 260 should be the tops with optimum temp being 230-250. Richen up your HSN. What type and % fuel are you using? I've always found McCoy plugs to be great compared to others. The seem to last longer and burn better than others I've used so I would say your fine with the plug. Something to check on your throttle would be to remove the airfilter (motor not running of course) and look down the barrel as you pull the trigger slowly. As you pull you should see it open right away. It could just be that your linkage is not set properly. Your slipper could also be the problem as to the slow response as well as the high temps. Unless your doing some insane jumping and such your best to set the slipper like this...full tight and then about 1/4 turn off. HTH

 

[Monkey Wrench]

I second what Jetmech suggests, and add a few other items to check.

1. Is the temp's you're getting with the body on or off? If on, you may want to cut some vent holes in the windshield to allow air to pass over the head a bit more freely.
2. I'm sure you've done this, but you may want to check for airleaks on your backplate, carb throat and fuel lines. A small air leak may be causing your mill to lean out which may result in higher temp's. Also, check the O-ring in the fuel tank.
3. In addition to checking the slipper clutch as a cause of higher rev's before it engages, I'd check the clutch shoe condition overall. It may have worn down to the point it simply isn't grabbing. If it looks OK, may want to take a piece of fine grit sandpaper and roughen the shoe faces up a bit. It's also a good opportunity to check your CB bearings.
4. Gearing. Personally, I think the stock gearing is great for bashing. I have a terrific Revo gearing chart that Jetmech sent to me that I am trying to get posted as a sticky, but in the meantime, I'll gladly send a copy if you PM me your e-mail address.

Hope this helps!

 

[RustyBoltz07]

What type and % fuel are you using?

I've been using Traxxas 20% B/C I've been told it works as well as the Trinity Fuel (correct me if i'm wrong). Also FYI, I have not yet put 2 gallons through my engine, I'm about half way through the second.

1. Is the temp's you're getting with the body on or off? If on, you may want to cut some vent holes in the windshield to allow air to pass over the head a bit more freely.
3. In addition to checking the slipper clutch as a cause of higher rev's before it engages, I'd check the clutch shoe condition overall. It may have worn down to the point it simply isn't grabbing. If it looks OK, may want to take a piece of fine grit sandpaper and roughen the shoe faces up a bit. It's also a good opportunity to check your CB bearings.

I've been running with the body on and have cut out half of the front windsheild for cooling and part for place to mount my wireless camera, I also cut a small sliver in the side of the body next to the engine (as shown in pit tips) where the body flares.
Also, could the shoes have been wore within the 2 1/2 gallons they have been run for. (I only ran my 2.5R for about a gallon)? onder:

Thanks for the help so far.

 

[jetmechG550]

I've seen the pads come off the slipper usually caused from the slipper not being set right. Also forgot to mention this previously, a turbo plug will not work in a standard head. I use Trinity Monster Horsepower 20% in my rides. Never gave me any problems. Traxxas isn't very popular around here so I have never used it, plus I hate those metal cans!

 

[Monkey Wrench]

Also, could the shoes have been wore within the 2 1/2 gallons they have been run for. (I only ran my 2.5R for about a gallon)?

Oh yeah, especially if the slipper clutch isn't set properly. If the slipper is too loose, the engine had to rev higher before the clutch fully grabs enough bell to spin the drivetrain. This means your clutch shoes are wearing faster, so I wouldn't be surprised to see you have to replace the shoes after adjusting the slipper clutch (if that turns out to be the culprit).

Also, I got your PM and will send you that gear chart shortly.

Good luck!

 

[Nitrobuzzard]

I'm not really up on the revo trucks but I do agree with jetmech on the fuel....I run the Trinity monster HP 20% and love it. I tried traxxas, BT, byrons and another that I can't recall at the moment but out of all I liked the trinity the best. For me it holds a tune better and doesn't choke the engine down as bad..............


Nitro