Re: NU50 Custom 26mm Intake Build

frank dadog /
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> Born to be WillD Wrote:

> -------------------------------------------------------

> I mean it's not crazy, but i'd warn against taking and applying advice

> directly from a 2 stroke guru if they're not a moped guru.

>

> Specifically dirt bike guys, alot of the same stuff definitely applies,

> but alot doesnt, one of the big ones being the lack of gears, which can

> change alot about where you're running and where/how wide you wanna make

> power. at least you're variated though, so as long as you know what

> youre doing there you can take advantage of peakier high RPM power with

> a loss at low RPM.

>

> for example, you look at an RM 80 and theyre running 28mm carbs, some of

> the competition folks run up to 32 and over. That's like racing dirtbike

> shit tho, those things make at least twice the power your kit does. and

> theyre spinning up to 14k, not to mention being slightly bigger too

>

> the other thing to consider about carbs, and its obvious but also easy

> to overlook is that youre reading a diameter but the flow's gonna be

> proportional to the xsectional area, essentiall it scales with r^2. so

> like from a 18 to a 28 is 1.5x diameter but effectively 2.5x the size...

> that also affects your velocity. you've got a flow rate based on your

> engine's volume (draw per revolution) and RPM. so for the same RPM you

> have to have the same flow and so your velocity's necessarily gotta be

> smaller which can hurt the mixing of the charge and response. Flat slide

> might be better here also.

>

> or the tl:dr w less theory, similar sized high performing engines can

> use that size range of carbs, but you might be overcarbed for the

> limitations of the cylinder and engine, and see worse performance in

> terms of responsiveness and low end torque.

>

> and of course much worse gas mileage.

Amen to that. Velocity is important and with gears you can get that by keeping it in the red. You're going to need a fat needle to compensate at low rpm.

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Subject Written By Posted
  NU50 Custom 26mm Intake BuildTopic by: David Cox David Cox 03/08/18 07:10PM
  Re: NU50 Custom 26mm Intake BuildRe: Charles Cole (OFMC) Charles Cole (OFMC) 03/08/18 07:17PM
  Re: NU50 Custom 26mm Intake BuildRe: alex ganz alex ganz 03/08/18 11:56PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 06:12AM
  Re: NU50 Custom 26mm Intake BuildRe: Captain Janeway Captain Janeway 03/09/18 01:16PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 01:55PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 02:39PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 04:31PM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/09/18 04:52PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 05:39PM
  Re: NU50 Custom 26mm Intake BuildRe: Jack Rutherford Jack Rutherford 03/09/18 07:58PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 08:37PM
  Re: NU50 Custom 26mm Intake BuildRe: Joe Schuitema Joe Schuitema 03/09/18 07:01AM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 09:54AM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/09/18 10:00AM
  Re: NU50 Custom 26mm Intake BuildRe: P D P D 03/09/18 11:38AM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 11:43AM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/09/18 04:47PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/09/18 05:28PM
  Re: NU50 Custom 26mm Intake BuildRe: Derek Cox Derek Cox 03/09/18 05:42PM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/09/18 09:06AM
  Re: NU50 Custom 26mm Intake BuildRe: frank dadog frank dadog 03/09/18 12:17PM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/09/18 09:07AM
  Re: NU50 Custom 26mm Intake BuildRe: Jack Rutherford Jack Rutherford 03/09/18 01:17PM
  Re: NU50 Custom 26mm Intake BuildRe: - Summerai - Drew - Summerai - Drew 03/10/18 02:45AM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/10/18 05:56AM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/10/18 07:13PM
  Re: NU50 Custom 26mm Intake BuildRe: frank dadog frank dadog 03/11/18 06:21PM
  Re: NU50 Custom 26mm Intake BuildRe: Derek Cox Derek Cox 03/11/18 07:04PM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/11/18 07:13PM
  Re: NU50 Custom 26mm Intake BuildRe: Born to be WillD Born to be WillD 03/12/18 05:18PM
  Re: NU50 Custom 26mm Intake BuildRe: Jack Rutherford Jack Rutherford 03/11/18 10:04AM
  Re: NU50 Custom 26mm Intake BuildRe: Graham Motzing Graham Motzing 03/12/18 09:51AM
  Re: NU50 Custom 26mm Intake BuildRe: Derek Cox Derek Cox 03/21/18 04:39PM
  Re: NU50 Custom 26mm Intake BuildRe: Derek Cox Derek Cox 03/23/18 07:07PM
  Re: NU50 Custom 26mm Intake BuildRe: Ryan . Ryan . 03/24/18 10:45AM
  Re: NU50 Custom 26mm Intake BuildRe: David Cox David Cox 03/24/18 02:42PM
  Re: NU50 Custom 26mm Intake BuildRe: Derek Cox Derek Cox 03/30/18 06:10PM

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