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General Category => General Discussion => Topic started by: lazlokovacs on May 28, 2015, 07:08:23 PM

Title: lean-burn carbs?
Post by: lazlokovacs on May 28, 2015, 07:08:23 PM: can anyone confirm if these are lean-burn carbs?

and if so, how does one change that high brass insert for a normal one??

thanks as ever

(http://i909.photobucket.com/albums/ac295/lazzlokovacs/IMG_6180_zpslqbesb1q.jpg?t=1432771556)

(http://i909.photobucket.com/albums/ac295/lazzlokovacs/IMG_6178_zps5bl1eyng.jpg?t=1432771559)
Title: Re: lean-burn carbs?
Post by: Triple Jim on May 28, 2015, 07:15:40 PM: A taller primary choke height makes a richer midrange mixture. Assuming you're referring to the shroud around the needle jet, going to a shorter one will make it run leaner.
Title: Re: lean-burn carbs?
Post by: Vasco DG on May 28, 2015, 07:29:43 PM: Why would you want to change them? Set up correctly the 'Lean Burn' type give crisper performance and use less fuel.

Pete
Title: Re: lean-burn carbs?
Post by: sib on May 28, 2015, 07:42:59 PM: Quote from: Vasco DG on May 28, 2015, 07:29:43 PM
Why would you want to change them? Set up correctly the 'Lean Burn' type give crisper performance and use less fuel.

Pete
If I've learned anything on this forum, it's that some folks want to change things just because they can.
Title: Re: lean-burn carbs?
Post by: NCAmother on May 28, 2015, 08:02:13 PM: Quote from: sib on May 28, 2015, 07:42:59 PM
If I've learned anything on this forum, it's that some folks want to change things just because they can.
You're right, but if you never change you never learn.
Title: Re: lean-burn carbs?
Post by: Bisbonian on May 28, 2015, 08:14:07 PM: I thought this was a diet thread.
Title: Re: lean-burn carbs?
Post by: jacksonracingcomau on May 28, 2015, 08:21:54 PM: Quote from: lazlokovacs on May 28, 2015, 07:08:23 PM
can anyone confirm if these are lean-burn carbs?

and if so, how does one change that high brass insert for a normal one??

thanks as ever

(http://i909.photobucket.com/albums/ac295/lazzlokovacs/IMG_6180_zpslqbesb1q.jpg?t=1432771556)

(http://i909.photobucket.com/albums/ac295/lazzlokovacs/IMG_6178_zps5bl1eyng.jpg?t=1432771559)

Answer is it knocks out , I think Rod (Yak Fat, RIP) did a summary of changes, search on here
But as Pete says, nothing actually wrong with them , my experience with LM 3 (LB PHF 36) over 1 or 2 (old PHF36) is they are only a problem when people put big jets in.

Nice dress
MH
Title: Re: lean-burn carbs?
Post by: lazlokovacs on May 29, 2015, 03:06:02 AM: thanks everyone,

original question was 'are these lean-burn carbs'?

anyone got a Y/N answer?
Title: Re: lean-burn carbs?
Post by: Vasco DG on May 29, 2015, 03:30:28 AM: Yes, they area hat have been described as 'Lean Burn' type. The shroud creates a greater depression around the anulus of the atomiser meaning for any given aperture more fuel will be pushed through from the float bowl.

Pete
Title: Re: lean-burn carbs?
Post by: lazlokovacs on May 29, 2015, 03:42:12 AM: thanks mate...
Title: Re: lean-burn carbs?
Post by: sib on May 29, 2015, 06:48:55 AM: Ah, so THAT'S where the Mystery Pin goes.
Title: Re: lean-burn carbs?
Post by: mtiberio on May 29, 2015, 09:44:38 AM: Quote from: lazlokovacs on May 28, 2015, 07:08:23 PM
(http://i909.photobucket.com/albums/ac295/lazzlokovacs/IMG_6178_zps5bl1eyng.jpg?t=1432771559)

forget the carbs, who is she?
Title: Re: lean-burn carbs?
Post by: lazlokovacs on May 29, 2015, 12:39:02 PM: vasco, (or anyone), do these lean-burn carbs require different jetting then? I was planning on using Ed Milich's jetting recipe as a starting point, engine is a lemans 1000 big valve...

^and our current assistant prefers to remain anonymous...
Title: Re: lean-burn carbs?
Post by: Vasco DG on May 29, 2015, 02:10:25 PM: Almost certainly yes. To the best of my knowledge all big valve 948's came with 'Conventional' carbs but that may not of been true for the U.S. market.

Pete