which one is better for a hyper 7??
is the 21 more fuel efficient?
can you get the 21 to go as hard as the .28?

I've seen two hyper 8 with one had the mac star .28 and the other had the 21. I can barely compare them. They have them two of my friends. They put them ia a race and the winner was the 21. The race was in a dirt ground with no little stones and that stuff, in 30-40 metres, the 28 finish half metre after the 21.

fair enuff sounds interesting lol
who had more fuel left lol???

I have both engines and the 28 uses more fuel.

28 more cc than the 21, of course and the 28 needs more fuel.

The guy needs to fit a slightly larger clutch bell, then there would be no chance of the 21 4 port beating the 28

Have owned both 4-port and 8-port hyper 21's. The 4-port is a nice motor, but the 8-port is a screamer than will run with almost anything out there. The 8-port will smoke a mac star .28.

i have owned the hyper 21 8 port and the mach 28 the mach 28's all need to be binned was gutted rubbish engine lasted gallon or so and then problems started so i just bought the hyper 21 8 port. i had them in my hyper 8.

Hyper .21 8 port rocks for the money. There's nothing else near for speed in that price range.

Yeah, i agree (for the money), but the hyper 8 with the .21 engine on, SMOKED by my hyper 8 with the Vspec on Just you loving that victory smell?

Yeah but its a $120 engine against a $270 engine (and thats the cheap version). So not really comparable.
My 1.1 car smokes my wifes, but mine cost £20,000 and hers £500

Your wife has RCs? Oh man, i must see that. Girls actually getting into the hobby

Something tells me dialectis not your first means of comunication, would you like us to start using cave drawings?

So the .21 8 port is a very competitive engine then? How about life span? I've got one that came with my violator, but I have yet to get a bump box for it so I can't run it yet. I've got a mach 28 in my hyper 7 and am not too thrilled with it. Just got done sealing it tonight so I'll try it again tomorrow. Another 21 8 port may be what I replace it with.

wow theres alot of info here guys ive always wanted a 21 cos i heard the 8 port kicks ass my .28 lasts about 9 mins a tank even when im doing alot of full throttle work so im happy with it but i want a 21 lol[8D]