here's one of my 28's

http://www.youtube.com/watch?v=svbaqFOW_5Q

I still think with the development of .21s vs .28 there is an advantage.

I would also like to know if the hard hitting .21s are because of a better pipe??

That is great power for a .21 but it is what a stock turbo head .28 can do or similar. I know the benefit of your motors over a .28 is power with great run time, but why do most .21 owners say the reason they don't run .28 is because it is over powered

Now.. I saw that video. Show me a .21 that can hold a wheelie like that..

I don't think that engine was using all of it's power. Didn't sound like it.

the 28 can match the peak numbers, but it cannot match the RPM range... The .21 can carry power much higher in the RPM range then the 28 can..... The 28 will make more power very early in the RPM range, usually too much ....but in the mid and top the .21 has more pull.... The .21 will also make the peak numbers higher in the RPM range and deliver the power much smoother.....Against a stock 28 the mod 21 lays down a spanking !

that is a mod 28..uncontrollable on a track !

O.K. Lets hear that one again. Only this time, lets hear what the stock

.21 does against a stock .28.

Or lets hear what a Mod .21 does against a Mod .28.

Lets not mix the Mod .21 with a stock .28. Apples for Apples.

Right on! Thanks for the explanation.

depends on the 21...the track conditions and the .28 in question.....

Well I'll go ahead and chime in here....I recently ran a JPX .28 (stock) with a Dynamite 086 pipe in my Jammin X1CRT (with my own custom chassis...long story) at the RC Pro Series race in Omaha, NE. I ended up having to go up 2 teeth on the clutch bell (to a 15t) just to calm it down out of the hole. I will say that it was big stupid fun to have that much horsepower, but in the 30 minute A main, it was exhausting trying not to over drive the truck with all that horsepower It definitely is not an issue of not being able to go fast with a .28, it is more an issue of being consistently fast....I honestly believe I would have done better with a good .21 just because it would have been easier to go fast and be consistent. But the .28 sure was fun, it put a smile on my face on the back straight every time I was dead even with everyone for the first half of the straight (and I think that was because of tire spin), but after that it was all over

Well that's my 2 cents

Andy

Dont get me wrong there is no disadvantage really because if you cant make a 15 min main without pitting so no matter what you will need to pit so not really bad to have one but if you were to buy a new engine I would say buy a .21. The dynamite platinum xpe .21 pulls a truggy really hard and fuel mileage is real good. I run one in buggy and so do my friends and even in a losi 8ight t 1.0 that thing runs FAST im very impressed by this mill and price.

the XPE wouldnt pull a truggy good, trust me ... its very close to the Alpha read head and i can tell you those arent truggy engines, you would have to go down a tooth or 2 on the CB to get it to pull, i even go down a tooth on the CB in a buggy with green head or red alpha. but the XPE is a good engines, just not a truggy engine.

The guys I race with are a pretty tight group. I mean I recently won a main by .2 sec not 2 sec but .2 Pit strategy is key in a situation like that. One extra pit and there goes your place. A nice strong 21 is just where it's at. It's much easier to drive consistent and power is never an issue. Now if you want to do doughnuts and drive on your lid then drop in a 28 I guarantee you will crash more and have slower lap times.

"too much power"... that's like saying "her tits are too big".

More engine doesn't make you crash, Your finger does..

I can't believe you can even say that.

When was the last time a person purchased a Honda CRF and never crashed

verses a person who drives a Ferrari and crashes more?? Hmm. It's the

person behind the wheel.

I'm sure Adam Drake Drive has a Factory Tuned Modified Toro Nero.

Don't tell me that there is an engine that doesn't have stupid power.

I don't see him putting it away and saying its way too much power. I can't

drive it. I can't see him saying there needs to be a limit on how much

power these engine product.

Also, if you remember back in the day. Adam also drove one of the most

powerful .12 engine in a Losi XXX-NT.

I didn't see him complaining nor did I see him loose his job because of

too much power....

Also, If what you say is true and a Modified .21 is stronger than a stock

.28, then why in the heck would you Modify a .21?? if the power is more

than a .28, then you are defeating the purpose. I'm sure with more power

comes more fuel consumption and now you have the mileage of a .28 if you

are creating the power of a .28.

You can't tell me that a stock Honda modified to run faster than a big block

doesn't get worse fuel mileage than it did when it was stock??

Wow. To make more power, you need 2 things. (MORE FUEL) HELLO

and (AIR).

All you are doing is making a better pump. Cleaning up any restrictions

to allow the mixture to flow better. (Also mixing it better as well)

Unless you are getting in to computer controlled engines (Which we are not

talking about) then you can't even go there.

Sure you can port an engine to get better fuel mileage. This is what

Nova Rossi has done with the Plus 4. Also, the are using a different port

combination that has not been done before. (Not that I know of) I don't

know of any other 4 port engines other than Nova Rossi. Basically

giving you more power and more of a smooth control will net you better

fuel mileage. Also, don't forget, adding a 6 mil carb restrictor also helps

curve the fuel consumption as well. Why else are people using more carb

restrictors then ever now.

So, a .28 has more displacement. Consumes more fuel, has more power.

But, if you were on a track with tons of jumps and you needed the get out

of the hole power and wanted more fuel mileage, you could modify a .28

to give you better mileage. The power would be more tame, but, it's still

there.

I agree the .28 currently is a waste. But, I also think it must have a place

otherwise, there would not have been a place for it. (Roar Books accept it)

Sure technology has also been place more on the smaller block engines

but if the same time and care were given to the larger block engines the

same would happen as well.

Example. Look at the New Mustang 5.0. 30 miles to the gallon.

When have you ever seen a mustang with that kinda mileage. (Well, I have

one. It's called the Mustang SVO 4 cylinder, fuel injected, turbo charged.

Don't stick you foot in it and you will have the mileage of a 4 cylinder, put

your foot in it and you have the mileage of a 6 or an 8 cylinder)

If I had some extra money, I'd like to send my Werks .28 to RB Mods or

someone like that in order to see what they could do in order to increase

fuel mileage and make the power more linear. I bet they could do this.

Again, I think if this could be done, there would be an advantage.


Someone mention the engines are not spooled up so high.

Like you need it to be. Have you ever heard of Gearing??

Any good racer knows you need to gear an engine according to the track

you are running. The same is for any engine and for any track.

So. When was the last time you saw a Formula engine at a Drag racing

event?? There's your RPM.

Different engine for different engine for different racing.

Look at Motocross. 2 strokes were the king and now? Hmm. Don't 4 strokes

generally have 2 times the displacement?? Aren't they now faster and better

then 2 strokes?? Fuel mileage is somewhat the same?? That's called

evolution. You can't stop it nor can it be changed. Someone will eventually

come out with a 4 stroke R/C engine that will max out the 2 stroke fuel

mileage issue and of course I'd like to hear this argument when this comes..

I can see it now. Oh. He's got a bigger engine. Oh, he's got a 2 speed.

Well, eventually someone will make a 4 stroke that will not have the need

for a 2 speed engine. The torque alone will be enough to allow that buggy/

Truggy to run a taller single gear. When this happens, Watch out..