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Doubled my fuel economy! - 7/23/2007 3:07:09 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		Ok! I thought of a way over the weekend to increase fuel mileage and decided to try it on a new go tech 26 which had to come apart anyway because the pinch was too tight. I typically would get about 8-10 min runs on a 125cc tank depending on mixture set.

Well, after the mod I was shocked! I knew it would work but didn't think it would be so dramatic. With a rich setup I turned in an 18:52 min runtime! This has far exceeded my expectations! I made other mods to increase power which offset the fuel economy mod. So now I have neglegable performance gain but fantastic mileage.

How much would it be worth to be able to pit 1 time in a 30 min race?
       Post #: 1

RE: Doubled my fuel economy! - 7/23/2007 3:24:57 PM   
JB COMP



Posts: 4198
Joined: 11/23/2006
From: Navarre, FL, USA
Status: offline 		do you have any pidtures of the mod?

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(in reply to lsurber)
       Post #: 2

RE: Doubled my fuel economy! - 7/23/2007 3:29:26 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		No, I want keep it to myself for a little while until I find out what kind of mod market there would be! $$$$ I can tell you that I changed crank-case pressurization timing but will show no pics yet!

< Message edited by lsurber -- 7/23/2007 3:53:06 PM >

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       Post #: 3

RE: Doubled my fuel economy! - 7/23/2007 3:45:33 PM   
SManMTB



Posts: 4831
Joined: 4/28/2005
From: Charlottesville, VA, USA
Status: offline
quote:

crank pressurization timing


What the he... is that?

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       Post #: 4

RE: Doubled my fuel economy! - 7/23/2007 3:51:19 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		The crank-case becomes pressurized on downstroke! Think it through.......it will come to you!

< Message edited by lsurber -- 7/23/2007 3:52:36 PM >

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       Post #: 5

RE: Doubled my fuel economy! - 7/23/2007 3:54:42 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		Sorry about the confussion, I edited the posts so it reads correctly now.

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       Post #: 6

RE: Doubled my fuel economy! - 7/23/2007 3:56:53 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		Has anyone ever run nearly 20 minutes on a 125 cc tank? Has this been done before?

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       Post #: 7

RE: Doubled my fuel economy! - 7/23/2007 3:56:55 PM   
SManMTB



Posts: 4831
Joined: 4/28/2005
From: Charlottesville, VA, USA
Status: offline 		Just never heard it being called like that before.

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       Post #: 8

RE: Doubled my fuel economy! - 7/23/2007 4:25:39 PM   
downunder



Posts: 3196
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Ummmmm....colour me very very sceptical. I'll say no more for the moment.

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       Post #: 9

RE: Doubled my fuel economy! - 7/23/2007 4:33:49 PM   
savagecommander


 

Posts: 482
Joined: 1/3/2006
From: sterling heights, MI, USA
Status: offline 		its nice to see corporate america has taken over the RCU community.....

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       Post #: 10

RE: Doubled my fuel economy! - 7/23/2007 5:28:20 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		I am not Corporate....!!!!! I just know how they work and don't want anyone stealing this idea! I have already given enough information that an engineer or engine builder should understand what is going on!

I need to duplicate results and fiqure the math! Also, a side effect of what I have done is low idle speed! Even with the physical idle set all the way in it idles slow! However, it is crazy stable and refuses to stall out even after a long full speed/high temp pass. I can let off and when rpm go low enough clutch disengages and engine goes almost silent but does not stall!

< Message edited by lsurber -- 7/23/2007 5:33:33 PM >

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       Post #: 11

RE: Doubled my fuel economy! - 7/23/2007 5:35:14 PM   
snowbl!nd



Posts: 3653
Joined: 1/21/2005
From: Manchester, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: lsurber

I am not Corporate....!!!!! I just know how they work and don't want anyone stealing this idea! I have already given enough information that an engineer or engine builder should understand what is going on!


Ok, so those most likely to be able to use your idea to make a fortune already know about it...

How about letting the rest of us in on the secret?

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       Post #: 12

RE: Doubled my fuel economy! - 7/23/2007 5:36:18 PM   
lsurber


 

Posts: 251
Joined: 6/22/2007
From: Fort Worth, TX, USA
Status: offline 		I want to know what the longest runtime has been with a 125cc tank and .26 engine? Anybody know?

(in reply to lsurber)
       Post #: 13

RE: Doubled my fuel economy! - 7/23/2007 5:45:26 PM   
Foxy



Posts: 8860
Joined: 3/23/2005
From: Kingston UK, but living in Athens, GREECE
Status: offline 		I've heard of people making 12 mins approximately, under racing circumstances. That would be running dangerously lean and is more like the time you'd expect for a lean tuned .21, I'm not sure about 26s, cos they're not widely used in racing, where runtimes actually mean something.

...by the way I'm also considering the value of this topic, since it is just a claim (and a fairly unbelieveable one no less) and gives nothing (of value to the racer or hobbyist) away...remember this is a discussion forum, so if you're not going to discuss it...you see what I mean...I'll leave it for now and see where it goes...

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       Post #: 14

RE: Doubled my fuel economy! - 7/23/2007 6:10:00 PM   
VIPER458


 

Posts: 741
Joined: 2/27/2007
From: cape coral, FL, USA
Status: offline 		yes, i do find it a little strange. why would somebody claim something then refuse to explain it? imo it just looks like he is trying to start a controversy over nothing...

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RE: Doubled my fuel economy! - 7/23/2007 6:27:26 PM   
SManMTB



Posts: 4831
Joined: 4/28/2005
From: Charlottesville, VA, USA
Status: offline 		So you changed the induction timing and made it longer (since to make it shorter you need to make a new crank and I don't think you did that).
Your secret is out, we can now all cash in on it.

(in reply to VIPER458)
       Post #: 16

RE: Doubled my fuel economy! - 7/23/2007 6:59:28 PM