Webra mid range rich spot

[Helinut]

Hi all
as you will probably know from my previous posts, I'm rather partial to
Webra engines : )
I've had a 61 AAR which has now been sold on in another model, and now own 2
Milly's, one with the 91 AAR (still running in but VERY nice) and a 75 P5.
The 75 is on an Hatori 650 and has oodles of power, but the mid range is far
too rich and I would like to smooth out the engine in the hover etc.
Has anyone had any success with mods or fuel/plug combinations on this
engine.
Thanks for letting me ramble
Helinut

[Andy Carpenter]

"Helinut" <helinut@ntlworld.com> wrote in message
news:ud0ia.1993$8i1.1005@newsfep1-gui.server.ntli.net...
Hi all
as you will probably know from my previous posts, I'm rather partial to
Webra engines : )
I've had a 61 AAR which has now been sold on in another model, and now own 2
Milly's, one with the 91 AAR (still running in but VERY nice) and a 75 P5.
The 75 is on an Hatori 650 and has oodles of power, but the mid range is far
too rich and I would like to smooth out the engine in the hover etc.
Has anyone had any success with mods or fuel/plug combinations on this
engine.
Thanks for letting me ramble
Helinut



I have been told that the only real way to get the 91 right through the
whole range is to fit the MC remote mixture carb
I had exactly the same experiences, as are two others at my field. I am
going to give the MC a go...
--
Carps.

[ http://www.carps.co.uk ]

[John Beynon]

> the 91 seems fine at the moment, its the 75 thats causing me grief.
> I have been reliably informed that the 91 AAR runs better with the 75 carb
> on it so I might try swaping carbs to see what that does
>
>

75 with a muscle pipe 2 is sweet through out the whole range!

jb.

[John Beynon]

> the 91 seems fine at the moment, its the 75 thats causing me grief.
> I have been reliably informed that the 91 AAR runs better with the 75 carb
> on it so I might try swaping carbs to see what that does
>
>

oh and i'm using Firepower F7 plugs,
jb.

[Jamie]

I had exactly the same problem with mine. I tried just about every plug out there, and the dual plug head. Fuel from 0%nitro to 15%. I was running a MP1 and it was great up top. But it would always be a problem in the middle. I only fly 3D so it wasn't a big problem. I used to lift off in idle up2, then unload the disc for a second to let the engine get up to full rpm. Then it would behave all through the flight. Great power too.

My solution was to put an OS91 with a hyperhead in. Top end power was not that much more, but torque blew the 75 away.


--
Regards

Jamie Wilson
"Helinut" <helinut@ntlworld.com> wrote in message news:ud0ia.1993$8i1.1005@newsfep1-gui.server.ntli.net...
Hi all
as you will probably know from my previous posts, I'm rather partial to
Webra engines : )
I've had a 61 AAR which has now been sold on in another model, and now own 2
Milly's, one with the 91 AAR (still running in but VERY nice) and a 75 P5.
The 75 is on an Hatori 650 and has oodles of power, but the mid range is far
too rich and I would like to smooth out the engine in the hover etc.
Has anyone had any success with mods or fuel/plug combinations on this
engine.
Thanks for letting me ramble
Helinut

[Helinut]

Was that the 90 Size Muscle pipe

[Andy Fell]

On Mon, 31 Mar 2003 21:47:55 +0100, "John Beynon"
<john@REMOVEMEbeynon.org.uk> wrote:

>> the 91 seems fine at the moment, its the 75 thats causing me grief.
>> I have been reliably informed that the 91 AAR runs better with the 75 carb
>> on it so I might try swaping carbs to see what that does
>>
>>
>
>oh and i'm using Firepower F7 plugs,
>jb.


I have used F7 plugs too, and found that it helps considerably with
smooth running of the 75AAR

Andy

[John Beynon]

> Was that the 90 Size Muscle pipe
>
>

yep, the MP2 90 size

john.