My Evolution runs great but has a tendency to run backwards. Prop is at 2 & 8 and Ive tried to follow thru on the flip but it still catches me out.
Timing cannot be changed by the user ( without drilling new holes)
Any ideas.

Don't know for sure about the Evolution, because the ignition may have a different timing.
I take it you mean a 27x8 prop? If too small, that may be the reason for running backwards due to lack of flywheel mass.
Instead of flipping fast, try a lazy flip, which will not advance timing before the engine fires and speeds up.
MVVS does not react with better starting to fast flipping, and IMHO starts better when turned over slower. I never did experience backward running. This may well be the case with evolution as well.

Thanks Pe, Im using a 24/10 wood maybe Im gonna find out what the difference in the ignitions is!!
I meant that the prop is at 2oclock and 8 oclock in regards to its position at TDC

Hi,

You have to start faster.

24x10 is a prop for the 43cc engine. The 58cc may beseriously underpropped. This partly explains the reluctancy to pass top dead centre, because prop mass is so low it does not want to move over the compression hump.
I would try a heavier prop first, at least until the engine has seen some running in. After that time, internal friction is lower, and you may get away with a small, light prop.

Andy,
The 24x10 is the correct prop for your 58cc. 26x10 is number two choice. My Evolution 58 started off running backwards a few times when new but after a couple gallons of fuel it no longer has that tendency. Both brands of 58cc use the same ignition. Is your's brand new? Give it a few runs and see if the tendency goes away. BTW, the factory recommended prop for the 45 is also 24x10 and it does turn it very well however users might experiment with 22x8, 22x10, 23x8 to see the maximum output of that engine in 3D applications! RPMs on both of these engines will go over 7000 on the ground depending on exhaust and prop choices. These are two very good engines for enthusiats that like to fly a lot!
J.

Hi Andy,

I am back from office i can send you my experiences with 58 ccm.
I have original canister and modificat header.

2 blades
24/12 Mejzl 6350
26/9 JAS wood 6150 RPMs
26/10 Mejzl. 6100

3 blades
23/10 Mejzl 5800 RPMs

Jan

Jan, how did you modify the header?

Yes it is new got about 6 flights on it.
Pe, I picked that prop as it was middle of the recommended range in the manual. Its not on a good pipe just the Bisson wraparound wityh the tips sawn off.
Maybe try a Mejzlic at 24/12...I dont have that much clearance. It seems this is way stronger than a ZDZ60 then as that motor struggled with a 24/8
The motor is on a Wild Hare Ultimate which it pulls out of sight.

Andy,
The 58cc MVVS engine should indeed be compared to the 70 cc competition range.
Brace the cantilever end of that Bisson muffler to the motor please!

I have done it. I have had 3 failures with the Bisson on other motors as they are a poor construction and the only reason I purchased this was a package deal and there was not an alternative at the time.It would be major construction to fit a pipe to the Ultimate. One bisson only lasted 3 flights even braced. I reinforced it and rewelded it and it has lasted much longer.
I am still impressed with this motor and will examine my starting procedure etc.

You haven't had AJF-2 helping have you,,, AJF-2, James almost has the Taylorcraft ready to fly,,,

Is this braced adequately?

Ben, it should be...they usually crack at the 90 degree between the round chamber and side mount. Never had that problem with a Supersonic or J&A

I wish Slimline made a muffler for this engine.

Hi,

I added 2 cm . You can see on my web.
http://www.poletovani.webzdarma.cz/edge540.htm
http://www.poletovani.webzdarma.cz/MOTORCELEK.JPG
You have to have pictur for header.
Size 50mm a have 75 mm.
Size 87 mm i have 70 mm.

P:S:Nice greet to NL from Praha. I spent nice holiday last year in Baarn.

ben beyer,

i bought my evo 58 when they first came out and there where no mufflers available. i modified a da 50 slimline muffler and have used it unbraced for over 8 months. i fly most weekends and thru the week. i have good power from my evo 58 and i am happy with the performance.


aerowiz

Thanks for the page links.
The longer header does not seem to hurt your engine's performance at all. How does the coupler High temp silicon paste hold up?

Yeah, I just don't feel like grinding out the port and drilling and plugging holes to make it fit.

Just a follow up.
I usually have the prop at 2 oclock and 8 has worked fine until the Evo.
I moved the prop to 11 oclock to 5 at the suggestion of a friend which means almost flipping down and it started just fine everytime. No backwards runs.
This motor still is impressing me.

Good morning,

I did not use silicone paste. Now i am rebilding my Edge 540 with 58 ccm. You can see on my web new pictures. I use silicone paste and silicone tape.

We will see next Year.