Taming the savage beast

[El Pirata]

Some of you may know I want to try to tame my sirio monster .27's because they have a little, actually a lot, too much power for my buggies. However I do this I do not want to decrease the efficiency of the engine, or at least the least amount.

I have thought about changing the gearing to give it less low end and a slower acceleration time but the end result would be a buggy that goes faster than the already radar tracked 50+ mph on the existing setup.

I could richen the engine up slightly but fuel economy would suck and I don't want that.



My last thought that I had this evening was to use the turbo head on the mill but use a regular plug. This will reduce compression and thus reduce the power.

My questions regarding this is are:

1. Will a standard plug cause the engine to fire late since the standard plug will be recessed greatly?

2. Will I have firing problems because the plug is recessed?

3. Will the output of the engine be greatly effected by doing this? IE: from 3.1 hp to 1.6 hp?

I mean in theory adding a turbo head with a standard plug will be similar to adding an extra glow plug washer in the mix. I'm curious about your thoughts on this before I opt to try this.

Update: I see now that the turbo plug is slightly larger in diameter than a standard plug so I now have to ask if I might be able to fit a helicoil in the trheads of the turbo head and then use a standard glow plug?

 

[SkyMaxx]

EP, the above ideas are great, but I tend to think that anything you do with respect to messing with the compression is counter to your statement that you do not want to mess with the engine's efficiency.

I would recommend getting a clutch bell with fewer teeth and perhaps a spur with more teeth. This would up the torque on the engine and reduce the top speed. Which, if I read you correctly, is what you are trying to do.

If you are trying to reduce the torque, go the other way...and just don't drop the hammer all the way when you are on the track. Save the true WOT that the engines can produce for the field bashing or jumping.

 

[El Pirata]

Yeah but the fewer teeth will make it harder to control during acceleration than it already is. Believe me on loose ground all 4 wheels spin when you squeeze the throttle all the way.

 

[newnitrofan]

Why not try to find some sort of carb restrictor or perhaps another carb all together that has a smaller bore to it???

 

[SkyMaxx]

Apparently my last two liner about not dropping the hammer went over your head. Why not just ease into the throttle vice slamming on the WOT? Perhaps you can control the acceleration vice allowing it to control you.

Just food for thought.

 

[ZANDOR]

hey el in my ws711 there is a venturi plug that is 8mm.they make a 7,8.and 9 mm.restrictor.7 being less power 9 the most.check it out they mite make one for the sirio....

 

[El Pirata]

Originally posted by SkyMaxx
Apparently my last two liner about not dropping the hammer went over your head. Why not just ease into the throttle vice slamming on the WOT? Perhaps you can control the acceleration vice allowing it to control you.

Just food for thought.

The throttle was only meant to be pulled all the way as fast as you can. You didn't know that?

As far as the restrictor goes, dude that's a hell of an idea. I have a machinist friend that can make one for me. I imagine I'll have to lean her out a great deal as a result.


I wonder is a venturi air flow pattern would work similar to this:

 

[lykan]

From what I remember, you messed with the EXPO n the radio all you could, and throttle response with that buggy was either on, or off.

It seemed to me you and error were saying it may hav a little sputter at the begining, but there was no middle ground for the thottle on this ride.

Perhaps you can change linkage setups to get more throw, or more travel in the linkage? Maybe even a slow response time on your throttle servo?

I really like the restrictor idea, it should really help with fuel effciency too.

 

[Digital Liquid]

What about your radio? If you have one that has variable throttle speed controls, you can control the engine better that way.

You can set the throttle speed relatively slow, that way, when you go WOT, the carb will still open up very slow. Thus, allowing you to control the buggy better. So no matter how heavy your trigger finger is, the carb will always open up smooth and slow.

Just another idea....

Later....:mex:

 

[AC48]

Just get a less powerful engine,lol

I agree with Digital Liquid, why don't you trying playing with our radio to slow down throttle responce times.

Find a very slow servo aswell lol

 

[robriguez]

Send me your Sirio and I'll send you my Picco .26. Its brand new never seen a drop of fuel. Other than that the carb restrictor would be the best idea.