Muggy250r

it is, except for the clutch if u dont have a vented CB

bigairlife

Well yes. All i needed to fix the clutch prob was get a vented 12 tooth cb. With the 12 tooth vented, I've been running the stock clutch shoes and springs for 2 gallons straight!!!

Surpluzz

Rotating mass (the difference between 1, 2 and 3 speed) in one of these engines and drive train has virtually no effect on performance. It would be similar to throwing a blade of grass in a running lawnmower's blades and saying that it effected performance. Therfore, the benefits of having a 2 or 3 speed tranny versus a single far "outweighs" the drawback of "rotating mass".

bigairlife

Actually it has a much larger effect on performance than you have stated. It's like this. A simple way of putting it is that a truggy race tire will allow an engine to prool up much faster than a set of beadlocks with jumbo kongs. The effect is just a little less than that in the 2-3 speed gears. Read the xrc test on it.

Surpluzz

Thanks Bigair, I understand the concept. My point is that the gears in a tranny don't have the effect on an engine that "Jumbo Kongs" do, or truggy tires. I understand your example in relation to both. The negative factors of rotating mass in a 2 or 3 speed is eliminated (canceled out) by shortening the first gear, making it easier to rotate the MASS. I simply wanted to point out that the power-to-weight ratio enables these engines to barely notice the few ounces of gears trying to stop them. Now, Jumbo Kongs certainly ARE a rotating mass to be concerned about. What is Prool?

bigairlife

Oh sorry. I meant SPOOL. lol

supertib

rotating mass plays a huge role in acceleration..........generally a Truggy will accelerate faster then a MT, alot faster........... even though a Truggy is a single speed and "stuck in second" it has a center diff which allows a motor to spool up and get into powerband much faster then a 2 speed setup....

here is a video of a lightened CF Savage and my Mugen MBX5T both with modded STS 30's... as you can see the Truggy is the faster machine, bottom and top

http://video.google.ca/videoplay?doc...97284940363929

losi8tboy

they look equal fast

snoking16

^^^ yeah i didnt notice any speed differance either.

NitroVenom

I guess not...


Yea supertib I see a diffrence. but only in bottem end really.. I can't really see much dirffrence in top because you neve gave the mugen a full speed run without letting off.

bigairlife

See. I was right. HAHAHA!!! lol. A truggy will accelerate faster than a mt with a 2 speed because of the extra weight the 2 speed gears carry as they spool up. [&:]

I told u so. lol

bigairlife

There is a pretty big difference on the bottom end and a small difference on the top end.

Surpluzz

Some&%# is retarded, Im sure of it.

ttoks

there is a huge difference here, think about it, how fast are the tranny gears in a savage spinning compared to the tires? at least 3-4 times faster, add it up and the added rotating mass will slow you down a lot more then you might expect, there so little rotating mass in a truggy drive train compared to a monster truck it's not funny, i know my 8ight T is much faster then both my revo and LST2, revo with an RB TM 523 and LST2 and 8ight with the mach 427..

rafa26

Guys click here to give your opinion in another thread:

http://www.rcuniverse.com/forum/m_6762930/tm.htm

bigairlife

Ya. U guys who didn't believe me before, you dont know what you are talking about. Ttoks (spelling?) is completely right. There is a HUGE difference in the accelerating capabilities of a truggy vs. MT

Surpluzz

Ok Ok BigAirHead is right I give up. No benefit to multiple speed set ups. hehehe. Maybe you all should try and change the world. Or just tell John Force and Mario Andretti that they could have ruled the world had they used ONE gear/speed. Later.

bigairlife

Ya. very funny. It's imposible in full scale cars because they dont rev high enough. I'm just arguing what is true. I just dont want people to believe something thats not true.

dhyde79

bigairlife: all I have to say on the topic is this. monster trucks and truggies aren't designed to run the same.... find me a truggy that weighs exactly what my savvy is, give it a 1 speed center diff, and the exact same gear ratios that my savage has, and we'll line up the savage and the truggy.

gear ratios and everything else play into that, claiming that there's an obvious advantage because of less rotational mass when dealing with a minute amount of weight when the gear ratios in the vehicles you're using to try to prove the point aren't the same, the tires aren't the same, and the weight and such aren't the same, is subjective, and in no way hard proof.

if you want to shut us all up on the 1 speed vs 2 or 3 speed, get a savvy, and lock it into 2nd gear, then take a savvy with functional 2 speed and run them, see which one beats the other, obviously if HPI's making 3 speeds and now a high speed 3rd gear kit, there's got to be some valid reason as to why they're doing it, since, as you say, the minute amount of rotational mass makes the truck slower....

Saosin57

"Accelerating Capabilities of A truggy vs. MT" If I ever have to do another science project it with be on this lol.[sm=lol.gif]

iamnot

i agree with dhyde79
it sounds like you all are trying to compare apples and oranges
identical vehicles need to be compared side-by-side with the transmission gearing being the only difference for any valid conclusions to be drawn
past that it's all he said/she said, so to speak

black mamba

Think so? I think it will make a difference because drag is drag. That observed 40mph is well over 300 scale mph with a 1/8th truck and 400mph with a 1/10th truck-and that's what the trucks "actually experience" when blasting up and down the street. Remember, we are really dealing with scale here, not 1:1. You'd better believe aero plays a role in overall vehicle dynamics. If this was all nonsense, then why does Protoform invest thousands upon thousand of dollars retooling their touring car bodies from time to time? Aero is the reason.[8D]

bigairlife

If you lock a savage in 2nd gear, it will be slower not because of the gear ratio, but also because of all the other gears in the tranny still have to spin, which creats rotational mass [&:] Stock, my muggy was heavier than a savage, and I still beat it even tho the savage had a 3 speed and a f 4.6 [>:]

ravenlunatic

hey bud, why don't you go and stack you truggy with some extra weight to match the savage and run it, then we'll talk. if you haven't yet then you've no argument so you might as well shut yer yap

yamahauler236

revo all the way. then lst, then savage