RE: Brillelli 366GT *60cc*  
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RE: Brillelli 366GT *60cc* - 6/3/2008 9:24:48 PM   
soarrich



Posts: 2333
Joined: 2/1/2002
From: Middletown, NJ, USA
Status: online
quote:

ORIGINAL: airlyons

Here's a couple of thoughts I have that could be COMPLETELY wrong but I have gained from endlessly reading tuning threads on forums. (ie if I'm wrong please chime in!!)

1) the low effects the high - their combined fuel flow adds up to the resulting RPM

2) the High doesn't effect the low - only the low needle supplies fuel until you cross approximately 1/2 throttle

3) all Walbros work on these same principles (?)


I would agree with all of these. I got so screwed around once I just about had the high-speed screwed all the way in and my engine pretty much ran OK, just not right, the low speed screw was out 3~3 1/2 turns. BTW, this was not on the 366GT, it has run like a top from day one, I thought it was impossible to miss tune this engine, it seemed what ever I do to it it runs great.




quote:


Hey Soarrich... that's a very interesting technique for tuning... so should I assume that you would in fact tune the low end first using your technique, and then tune the high end for peak rpm?

Now my question... on the 366gt instruction sheet it says the high effects transition - that would seem to debunk the above principles!!!!????? Any thoughts????

Chris


Chris
I put these two together for a reason. My technique is an adaptation on what I learned on a phone call with Scott, he knows engines, debunk is a strong word. The high speed needle may have some effect on the transition, but I haven't seen it. My friend imports the MT line so I've got all of them many times over and have used this technique for tuning them for me and others, so I know it works, I don't even speed the engine up above 4000 rpm until the low speed needle is set. My 366GT has been the standard for all my other engines, so far the 366GT is the BEST engine I own. If you where to have one engine, the 366GT is the one you want.


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Rich Border

(in reply to airlyons)
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RE: Brillelli 366GT *60cc* - 6/4/2008 3:26:36 AM   
Jake Ruddy



Posts: 3004
Joined: 5/22/2005
From: Newark, DE, USA
Status: offline
quote:

ORIGINAL: JoeAirPort

The engine came to me way richer than it is right now so I have improved it, not made it worse. It's obvisously sensitive to starting too wet, you said it yourself. This being my 4th gasser, none of my other ones are like this.


I didn't say you made it worse?

However if it is 4 stroking in a harrier it is fat... that is just a fact.

The needles dont overlap as much as you think.. regardless of how close they are to eachother they are on different circuits. They overlap in the middle but at both extremes they are not really effecting eachother a great deal and the high end has no effect on the low end running or transition.

I can't show you a vid with my EF because it was on a pipe.. but my old Cap you can hear it is silky smooth in the mid range as well as low throttle during harriers. Your engine is not tuned properly yet.. I was just trying to point you in the right direction since you having some issues.

(in reply to JoeAirPort)
       Post #: 1202

RE: Brillelli 366GT *6... - 6/13/2008 12:21:27 PM   
ultra6a



Posts: 70
Joined: 9/2/2004
From: Charlotte, NC, USA
Status: offline 		What spark plug should I use in this engine?

(in reply to Jake Ruddy)
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RE: Brillelli 366GT *6... - 6/14/2008 7:32:30 PM   
JoeAirPort



Posts: 6916
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		Well I finally got mine sorted out....I think (don't want to jinx myself) . It needed a ton of leaning to get the high needle in the ball park of where it needs to be. At least a half turn. The low needle needed lots of leaning too. In fact I'd say a 1/2 turn on both to get decent power out of it. Also the flooding issue was resolved by using the choke sparingly. I only flip once or twice with the choke on....no more or it can flood. And I also attempt to start it without the choke at first. If it won't pop, then and only then will I choke it. Also I only choke it at idle. Doing that I had no problems with flooding today. Now that I have it tuned good I'll just break it in by flying. The engine is still pretty tight with less than 2 gallons through it.

PS: Use an NGK BPMR6F. Resistor plug only !!! This is right out of the manual.

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RE: Brillelli 366GT *60cc* - 6/25/2008 2:30:28 PM   
StPeteFlyer


 

Posts: 54
Joined: 6/12/2007
From: St. Peters, MO, USA
Status: online 		Could anyone tell me what kind of RPM they are getting on their B60 with a 23x8 prop? I had a 22x8 on and I was getting about 7400, and now I have switched to a 23x8 and am only getting 6400. It just seems abit low to me and after messing around with the tunning I can't seem to get it higher then that.

Thanks

(in reply to Scott Ellingson)
       Post #: 1205

RE: Brillelli 366GT *6... - 6/25/2008 3:17:16 PM   
JoeAirPort



Posts: 6916
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		It should be more like 6600-6800 IMO. 1000 RPM is a big drop. Is it the same brand prop? I'm only getting 7000 out of a 22x8 Xoar with the stock pitts but I haven't leaned it out fully. It's only got a few gallons through it.

FYI, Scott at Brillelli says he prefers the 22x8 over the 23x8 for the lightening fast spool up.

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RE: Brillelli 366GT *6... - 6/25/2008 3:41:30 PM   
rcbill


 

Posts: 444
Joined: 2/13/2003
From: pleasant prairie, WI, USA
Status: offline 		I am getting 7300 on a 22x8 NX and about the same with a 23a Vess. The NX had a better vertical (almost 18 pound Yak) but the Vess had much better braking on landing. I tried a Xoar 23x8 last year but I don't recall the rpm. Just like Joe mentioned about Scott..... I prefer the faster spoolup on the 22x8. It still has PLENTY of power and idles reliably at about 1400/1500 rpm...... Bill

(in reply to JoeAirPort)
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RE: Brillelli 366GT *6... - 6/25/2008 3:54:09 PM   
Jake Ruddy



Posts: 3004
Joined: 5/22/2005
From: Newark, DE, USA
Status: offline 		My new one has about 4 gallons through it and I am getting 6950 hot with a Mejzlik 23x8.

What 23x8 prop are you using?

(in reply to rcbill)
       Post #: 1208

RE: Brillelli 366GT *6... - 6/25/2008 4:00:04 PM   
StPeteFlyer


 

Posts: 54
Joined: 6/12/2007
From: St. Peters, MO, USA
Status: online 		Im using a Xoar 23x8 now but have a mejzlik 23x8 on order.

(in reply to Jake Ruddy)
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RE: Brillelli 366GT *6... - 6/25/2008 5:10:32 PM   
Jake Ruddy



Posts: 3004
Joined: 5/22/2005
From: Newark, DE, USA
Status: offline 		I have found Xoars put a pretty heavy load on the engine with no real performance increase. They also get loud in the 27x10 sized even in the mid 6k.

(in reply to StPeteFlyer)
       Post #: 1210

RE: Brillelli 366GT *6... - 6/25/2008 10:31:14 PM   
AirWizard



Posts: 952
Joined: 4/23/2004
From: Coffeyville, KS,
Status: offline 		I'm getting around 6550 with a Xoar 23x8

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David
____I'm having a Yak Attack_____

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RE: Brillelli 366GT *6... - 6/26/2008 3:56:53 AM   
JoeAirPort



Posts: 6916
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		Scott likes the Xoar prop's.

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Joe AP

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RE: Brillelli 366GT *6... - 6/26/2008 2:42:00 PM   
Jake Ruddy



Posts: 3004
Joined: 5/22/2005
From: Newark, DE, USA
Status: offline 		Only because they were the hot prop back then when all the numbers were taken... a lot of the newer tests are done with Mejzlik. Xoars do not pull worth a darn compared to a Vess and Mejzlik. Vess are just loud and will only get to a certain speed.. where as a Mejzlik pulls a little less but will keep going.

You need to remember Scott doesn't get much chance to fly so it's not like he has alot of comparision data to go off of. That is one of the reasons I got involved and later became a team pilot. I am burning 30-40 gallons in a summer and this year more now that I am deep into IMAC. Have to burn a lot of gas to practice and then I need time to have my 3D fun

(in reply to JoeAirPort)
       Post #: 1213

RE: Brillelli 366GT *6... - 6/26/2008 3:20:57 PM   
JoeAirPort



Posts: 6916
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		The Mejzlik 22x8 would probably be too little load for this engine correct (and way too loud)? That's why you are using the 23x8? And 6950 is with a pipe or the stock Brillelli pitts?

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Joe AP

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RE: Brillelli 366GT *6... - 6/26/2008 3:37:38 PM   
Jake Ruddy



Posts: 3004
Joined: 5/22/2005
From: Newark, DE, USA
Status: offline 		This engine will happily spin in the mid 7k all day long. On an ES Pipe Chris H was getting 7550 with a Mejzlik 23x8 and the prop didn't sound that loud.

I know Tony the other team pilot prefers the spin up on the 22x8 Mejzlik more and he runs those and PT 22x8s. Scott actually likes it as well on his EF