SS 4.6 horsepower question

Posted: Tue Apr 05, 2005 12:33 am Post subject: SS 4.6 horsepower question

I just finished reading Xtreme RC Cars review of the SS 4.6 and it left me with a horsepower question. The magazine claims the 4.6 produced 1.32 hp on a dyno, yet HPI claims that the 4.6 produces about 3 hp. That's a really big difference, why the discrepency? On a side note - the review was excellent - they loved the 4.6 (how could they not) and have some great pics in the article.

Posted: Tue Apr 05, 2005 12:36 am Post subject:

These Guys also said the SH-28 makes 1.33 HP. Rolling Eyes

Something is wrong with their Dyno.

Posted: Tue Apr 05, 2005 6:32 am Post subject:

Is that review on their website at all?
I looked and couldn't find it. If anyone else does can you post a link please?

TIA

Posted: Tue Apr 05, 2005 6:44 am Post subject:

Or maybe they are measuring the hp at a different place than the people reading high 2's

Posted: Tue Apr 05, 2005 10:17 am Post subject:

im not sure,but when i had my mustang dynoed, at the rear wheels i had 308 hp which in turn is about 360 at the fly wheel.Due to the transmission using hp to do its job.Maybe they do dyno in different ways or somthing like that.just my 2 (is there a cents symbol anywhere on this keyboard)peace out

Posted: Tue Apr 05, 2005 11:41 am Post subject:

HP loss through the drivetrain sucks.. I'm only getting 422 HP to the wheels in my integra Sad

474 at flywheel... Oh well. I doubt that they would be measuring the power at the wheels though.. I'd think they would just measure it at the flywheel...

Posted: Tue Apr 05, 2005 5:48 pm Post subject:

Im always sketchy about the HP advertised.. I say take them with a grain of salt..

Posted: Tue Apr 05, 2005 7:48 pm Post subject:

Posted: Tue Apr 05, 2005 8:05 pm Post subject:

I own a 4.6 and i hate to say this, but my .21 RG at 1.9 hp sometimes makes me wonder if the K4.6 is really even close to 2.9HP. I think HPI Specs are BULL. Who is going to tell them hey are wrong. Every dyno is different.

Posted: Sat Mar 18, 2006 4:28 pm Post subject:

I'll clear somethings up.

Our dyno is the only dyno that is a standard in the industry. HP is an easy number to calculate and I'm not sure why we want to be tricked into our little engines produce more HP per displacement than some of the most advanced engines in the world.

Ask yourself if you actually ever seen another dyno in use, then ask yourself why again?

Go to our website and you can see it in use, but remember it's about a standard. We've set that and things will come back down to reality with HP numbers. But honestly I can explain why our dyno works, why the HP is correct, and accurate. Most people, or even these "other dynos' will not and cannot.

Compare our numbers to our numbers and don't fall victum of marketing.

Posted: Sat Mar 18, 2006 5:32 pm Post subject:

I was just getting ready to say the same thing as Derek. The X-dyno is different than all other dynos. The power is measured from the engine not the wheels. Yes the numbers seem like they are bogus but they're consistent.

Xtreme RC cars

Posted: Sat Mar 18, 2006 6:50 pm Post subject:

Posted: Sat Mar 18, 2006 7:14 pm Post subject:

All horse power claims differ... Also compants BS all they want...Like a 5hp. Trukzilla Rolling Eyes

Also if you look in the old RTR .25 adds they say "40+ MPH" when a RTR goes 33mph tops Laughing

Posted: Sun Mar 19, 2006 1:49 am Post subject:

for truck uses hp is a very poor figure to determine if the engine is good or not cause they could make all the hp they want at high rpms but if you put that in to a 12+pound truck it will be slow as a dog cause it doesn't have the TORQUE at low rpms. infact there are some crazy .21 that makes insane amount of hp and its true but it useless if it is unable to reach that rpm (tire drag, wind resistance and drivetrain drag...).

Posted: Sun Mar 19, 2006 4:08 am Post subject: Re: SS 4.6 horsepower question

Lok-Tar!

Posted: Sun Mar 19, 2006 4:08 am Post subject: Re: SS 4.6 horsepower question

oops double post

Posted: Sun Mar 19, 2006 2:36 pm Post subject:

The HP game is a very confusing game because if you look at the new issue of Xtereme they have a .12 at 1.11 hp not bad if the .28 is 1.3hp . However look at the torque numbers the .12 is like 37 oz-in. but the .28 is in the 75 oz-in. range for torque. I completely agree with the x-dyno the numbers are true even if we don't like them. I mean come on a piston the size of your thumb creating over 1 HP is pretty cool. I mean look at your lawnmower it's what 5-8hp and has a piston the size of a soda can.Now run that same engine on Nitro and see what you get for numbers! And besides the x-dyno for numbers I would ask around and get real opinions on what people think of whatever engine you're looking at.But be sure they have first hand experience with them.

Posted: Sun Mar 19, 2006 3:55 pm Post subject:

I would beleive a guy with a dyno before I beleive some guy in Hong Kong who's simply trying to move engines.

For that matter ask yourself why engines that are known to be "twins" of other engines on the market are rated differently?

And as far as I know, no one has a chassis dyno for rc cars.

Posted: Sun Mar 19, 2006 5:53 pm Post subject:

Posted: Sun Mar 19, 2006 10:13 pm Post subject:

the adress is www.rc411.com Enjoy ! And if you have noticed I think the Derek B is one of the guys from the magazine!


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