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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car Engines >> Car Nitro & Gas Engines >> 5 port or 7
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5 port or 7 - 6/27/2008 5:16:25 AM   
dirthead


 

Posts: 529
Joined: 9/25/2006
From: Grand Falls, NB, CANADA
Status: offline 		I have a novarossi p5x that needs new p/s, and was wondering whitch one to get. I hear the 5 port has great low end and good top end, but can be hard on fuel, and the 7 port is easier on fuel, and has less power though, can anyone confirm or deny this?
The 7 port is on sale at Amain for 204.99, p/s/r assembled.

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RE: 5 port or 7 - 6/27/2008 1:09:12 PM   
Logi3


 

Posts: 108
Joined: 6/19/2008
From: Cardiff, UNITED KINGDOM
Status: offline 		I always thought the more ports an engine has the better top end due to having more RPM. Thus, uses more fuel

5 port shouldnt rev as high as a 7, but have more low end torque. Cant see how a 5 port would use more then a 7 port.

I race Saturday on a tight and twisty track, my 7 port rarely gets to topend.

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RE: 5 port or 7 - 6/27/2008 1:28:49 PM   
GRANT ED



Posts: 2579
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From: Adelaide, AUSTRALIA
Status: offline 		There is no hard and fast rules regarding number of ports and topend/bottom end performance. Port timing has a greater effect than the number of ports.

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RE: 5 port or 7 - 6/27/2008 10:07:48 PM   
dirthead


 

Posts: 529
Joined: 9/25/2006
From: Grand Falls, NB, CANADA
Status: offline 		I read that racers are going to the 7 port conversion, from Amain, and are getting better fuel milage. Maybe they just want to sell the more expensive 7 port p/s set.

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RE: 5 port or 7 - 6/27/2008 10:18:22 PM   
supermod


 

Posts: 236
Joined: 8/6/2007
From: lisbon falls, ME, USA
Status: offline 		5 or 7? 7

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RE: 5 port or 7 - 6/27/2008 11:00:08 PM   
dirthead


 

Posts: 529
Joined: 9/25/2006
From: Grand Falls, NB, CANADA
Status: offline 		Can you explain y supermod?

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RE: 5 port or 7 - 6/28/2008 12:23:13 AM   
supertib


 

Posts: 3473
Joined: 3/30/2004
From: , MB, CANADA
Status: online 		both the Go 5 port and 7 port are 5 port engines.... the only difference between the two motors is the 7 port has a 3 port MES exhaust, but other then that they are the same exact motor......The name 7 port is strikly marketing and has absolutely no reference to how many ports the motors have...

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RE: 5 port or 7 - 6/28/2008 1:32:20 AM   
dirthead


 

Posts: 529
Joined: 9/25/2006
From: Grand Falls, NB, CANADA
Status: offline 		Here's a link to all the different p/s sets, and you can clearly see the different ports in the 5 and 7 port sleeves. If you read the explanation for the 7 port complete set, the one for 204.99, you'll see what I read about it.
http://www.amainhobbies.com/advanced_search_result.php?keywords=novarossi+piston%2Fsleeve

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RE: 5 port or 7 - 6/28/2008 2:54:26 AM   
supermod


 

Posts: 236
Joined: 8/6/2007
From: lisbon falls, ME, USA
Status: offline 		simple..the go 7 port will out perform the go 5 port

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RE: 5 port or 7 - 6/28/2008 3:22:58 AM   
ezveedub



Posts: 424
Joined: 6/8/2007
From: Davie, FL, USA
Status: offline 		Not true about the 7port and 5port are the same on Nova's. I have 7 port Novarossi's that have 7 inlet ports and 3 outlet ports. While the 5 port is 5 inlets and one outlet. If your tracks have short run ups to the jump, go with a 5 port, even a 3 port if you could find it. If you have running distance to the jump, the 7 port should work fine, it just will not spool up enough torque to clear quick short jumps off turns, unless you clutch it high.


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RE: 5 port or 7 - 6/28/2008 3:27:43 AM   
supertib


 

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Status: online
quote:

ORIGINAL: ezveedub

Not true about the 7port and 5port are the same on Nova's. I have 7 port Novarossi's that have 7 inlet ports and 3 outlet ports. While the 5 port is 5 inlets and one outlet. If your tracks have short run ups to the jump, go with a 5 port, even a 3 port if you could find it. If you have running distance to the jump, the 7 port should work fine, it just will not spool up enough torque to clear quick short jumps off turns, unless you clutch it high.



oooops I was not talking about Nova's LOL !!! I thought this was a Go thread LOL.

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RE: 5 port or 7 - 6/28/2008 3:04:40 PM   
supermod


 

Posts: 236
Joined: 8/6/2007
From: lisbon falls, ME, USA
Status: offline 		ya fewer ports in general means more torque.

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raze .28rr,17t,jp-2,spiral diffs,lightened cups/o.s .30vg modded/hyper 7 .21 8p,nothin but OD plugs and fule!

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