GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

Looking for anybody running any or all of these engines for 3 or more months. List your experiences with any of the 3 engines.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

i run the 5 port in my truggy and the 7 port in my buggy.... i honestly believe these mills are the best bang for buck you will find... run them with the 2047 pipe and you'll be happy as a pig in ***** :D dont think you will find anyone that will say anything bad about them dude...

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

i have no expirience with the 3 and 5 port, but i run the 7 port with rb 2045 pipe and all i can say it's the fastest engine on the track, and reliable.
i also want to know how the 3 port compare to the 7.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

I agree. The 7 port is hard to beat for the money

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

It really depends on the tracks you run on. The 5 port will be great on tight/technical tracks. the 7 port good on high speed tracks with a less technical layout. And the 3 port R will be pretty good on either.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

That kinda makes no sense...
In theory,
3 port = more low end power=good for tight technical tracks
5 port = compromise
7 port = more top end power= good for long high speed tracks

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

the 3 port R spec has a more linear power band then the 5 port. It has around the same bottom end as the 5 but a little more top end and its easier to drive.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

That theory is wrong, in general.
;)

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

the 3 port seems to be unavailble everywhere. where can i get one?

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

Please explain:D
I'll just give you the example of the nova Plus 21-5 vs Plus 21-7 same engine different sleeve if you ever had both of them side by side you would see the difference...
Go may have developed their 3 port in a very different direction in relation to the 5 and 7 But in "Theory" apples to apples,
[/quote]
3 port = more low end power=good for tight technical tracks
5 port = compromise
7 port = more top end power= good for long high speed tracks
[/quote]

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

I was just saying that the number of ports have nothing to do with power when it comes to designing an engine. 7 ports does not automatically produce more power than 3.

Now in this specific case (Go engines) it might vvery well be that they designed the engines in a way the 3 port would make less power than a 7 port.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

I thought the number of ports help to dictate how the power band worked,
Like the 3 port created its highest torque/hp at a lower RPM

and a 7 torque/hp curve was more towards the higher rpm range

And that higher ported engines use more gas.

Any of this true?

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

Not true at all. Everyting depends on the port timing and size, not the number of ports.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

So what do the number of ports affect?

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

It's a way to control how the fresh fuel mixture flows in the cylinder. It's also a good idea to break up a very wide port in two or more parts to give the piston support. If the port is too wide the piston can actually tilt and catch the edge of a port.

:)

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

So.. the higher ports produces a better fuel mixture?

I have noticed higher ports seem to rev a little higher

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

No, but the designer will have more control of where and how it enters the cylinder.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

So how do you decide what to buy 5 or 7 port?

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

How I decide!?

I don't know. If the manuf says one engine has more bottom end and that's what I need then I buy that.

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

The Go tech 3 port R Spec is a new design. It is comparable to a V-spec With a smooth powerband and not as much high speed as the 7 port. Now the 3 port R shouldnt be confused with the Go tech 3 port sport which follows the general rule of thumb Less ports = more bottom end.

Email this guy he can set you up with the 3 port R spec

[email protected]

RE: GO TECH .21 3p - 5p - 7p race engine what would you choose and why or why not.
 

The number of ports and their placement is also used by engine designers to utilise the 'loop scavenge' effect in 2-stroke motors.