x port engine

[lst2_ottawa]

Sorry for the ignorance, i'm totally new to nitro engines. Some engines are 5 port, some 7 and some 8. What does that port thing mean? Can someone please clarify that for me?

Thank you!

[cgroves]

Theoretically the more port area the more efficient the engine is in moving fuel/air into the cylinder and pushing exhaust out. So if the ports are the same size more indicates more power. Of course the movement of those gases is quite complex. I doubt you could correlate the number of ports with performance in any sort of reliable way.
I don't think I've ever seen any of the mainstream airplane or heli engines advertised based on their port count.

[Dynamic Man]

Yes Corey you are right. more ports more power more trouble and usually more cost.

In the car side they advertise up to 7 ports and for a .21 size engine you can pay over $1000 to go real fast.and super hard to set up due to the amount of fuel required to adjust just right.

In general I think most engines are 3 port. I saw that Nova Rossi is coming to Helis. They are a very good car engine right now and they will maybe up the anti for the 3D guys for HP per CI.

For a new guy to engines if you are talking airplanes or helis I would stay to the tried and true engines such as OS and Thunder tiger and Saito.

Even if you are running the cars 7 ports is very overkill and expensive.

Fred

[lst2_ottawa]

Hello Fred,

Yes, it's for LST2 that comes with Mach427 7 port engine. I was looking at RB Concept TM928 (01900-000123) which is $350US. Not sure if I'd want to spend that much.
I like Mach427's torque and power; however I find that tunning and idle on those drives is a bit painfull...