RE: which engine is better: k4.6 or F4.6?
 

The Axial engine use the K-series engine starters, and likewise, the K4.6 use the Axial big block starters. Even the .28 Spec1 RR will mount the K-series rotostarter directly.

RE: which engine is better: k4.6 or F4.6?
 

good to know savagejim!, but can u post a link to show me the place where i can get it the cheapest ?, btw thanks for the info so far.........

RE: which engine is better: k4.6 or F4.6?
 

come on guys where i can find the axial for my savy but at the same time it can work with the rotostart?

RE: which engine is better: k4.6 or F4.6?
 

Those looking for a new engine might find this link helpful:

http://www.nitroaddicts.com/forums/s...ead.php?t=2189

RE: which engine is better: k4.6 or F4.6?
 

That is almost useless when you look at all the different fuels they used to test with, where is the parity in that game?

Axials can be bought all over the place, ebay is always loaded with them, sometimes you can buy a new 28 shipped for 100 dollars. The rotostarter for a K5.9 is a direct swap. The F4.6 RTR roto starter is not. I am not sure why you would want a rotostart on an Axial 28/32. As long as the front bearing has not let go and the carburetor has not fallen apart, they are very easy to start and tune due to their mild engine timing. They are way down there on the power list, but really easy to live with.

http://www.youtube.com/watch?v=oSmMzpZM_As

Just set the mid needle flush, then follow his instructions. When you start your Axial, open the carb slightly and prime it. They really do start easy.

I have owned 8 of the Axial 28/32 Hpi K4.6 engines and 5 of the K5.9 engines. None are big on power, but the generally start and tune easily. Another plus for them is that they have a really nice robust pill starter. Glen

RE: which engine is better: k4.6 or F4.6?
 

[/quote]

That is almost useless when you look at all the different fuels they used to test with, where is the parity in that game?

[quote]

I didn't write it, I just found it. Sorry...

I still have the stoke F4.6 with a tuned pipe and it has plenty of power. I have a hard time keeping the front wheels down on take off. Not sure how enjoyable more power would be but I'm still learning the truck and it's driving dynamics.

RE: which engine is better: k4.6 or F4.6?
 

My son's F4.6 (thanks Glen) outruns my K4.6. Both tuned by me, same gearing, not tested in lab environment.. etc. For what we do, we are happy with them. We wouldn't know how to act with much more power.....

RE: which engine is better: k4.6 or F4.6?
 

I totally agree with you. My F 4.6 runs great!

RE: which engine is better: k4.6 or F4.6?
 

Yup, I love my F4.6 too. I love it so much in fact, I bought another one for my truck. Well... i actually fully rebuilt it. New Crank case(with bearings) New head (with button), New piston/sleeve/rod. So basically new engine.

The first one reached almost 10 gallons, and the only reason i rebuilt it was because i completely stripped my head button. Glow plug would leak like crazy and it got to the point where it would just slide in and out without
even screwing it in. And since i bought all the items off ebay, and i had to replace the head button anyways, i completely rebuilt it. Cost me about $70 for everything(saved myself $50 or so).

The old engine could have easily run for 13-15 gallons. It still had great pinch, tuned tremendously well (could idle for ever, extremely consistent and easy tuning) and still had all of its power.

In comparison to the K4.6. Ive never run against a K4.6 and not beat it. Quite easily faster than the K4.6s. And also, it seems like wheelies are far easier on the F4.6, especially with the truck rolling. The K4.6 can only get
the truck up if its at a complete stop. The K4.6 seems to have a bit more mid-range power. But not much. In a drag race, the K4.6 truck seems to catch up a bit after they both hit 2nd gear.

RE: which engine is better: k4.6 or F4.6?
 

2.9 hp is 2.9 hp. What you need to be concerned with is the area under the hp and torque curves of those two engines. The engine with the fattest hp and torque curves is the better engine regardless if it revs to 32K rpm or 29K rpm. And don't think for a second either of those engines actually make 2.9hp...they make less than 1.5hp. lol