Engine Differences

[tractorman]

What's the difference between the K4.6 and the F4.6 engines?

 

[-SaVaGe X-]

i think their the same just different cooling heads but I'm not sure cuz i never owned anyone of them. but someone here will know better than me.


:FarleyParty:WELECOME TO THE FORUM TOO!!!!:FarleyParty:

 

[RangerRock]

I am not sure what the difference is but someone on another forum was asking if he could use a k crankcase on an f motor and several people replied that the k and f motors are completely different motors. Not sure what they are though...........

 

[Crash]

HPI K4.6


Displacement: 4.59cc
Bore: 18.00mm Stroke:16.00mm
Carburetor: 2 Needles Slide 8.5 mm
Piston / Sleeve: ABC
Glow-plug : Standard
Ports:
Exhaust: Rear
Max Rpm's: 35,000
Claimed HP: 2.9 HP

HPI F4.6


Displacement: 4.59cc
Bore: 18.68mm Stroke:16.80mm
Carburetor: 2 Needles Slide 8.5 mm
Piston / Sleeve: ABC
Glow-plug : Standard
Ports: 8
Exhaust: Rear
Max Rpm's: 32,000
Claimed HP: 2.9 HP

Now you have the facts,

let me comment on the k4.6

I love it.

 

[Jeremy]

Hey I need that carb off that k4.6

 

[Larsenracing]

I thought the K4.6 was a 3 needle carb. The picture you have shown for it is a 3 needle carb to. Also, the Carb on the F4.6 is 7.5MM not 8.5MM like the K is.

 

[ShiftPoint]

Mine is 3 needle, I noticed that too.

I have one of each of these motors, they are both, well to me they have a lot of power. The K4.6 was easier to break in, it also rns a bit hotter than the F4.6.

 

[Larsenracing]

I believe the K4.6 is the Axial .28 Spec 1S(Not the RR) engine where the F4.6 is HPI's engine.