Puch 15mm Bing intake orig location - all we get sharp 90degs?

Julian L /

Sep 10, 2020 02:45PM

So I've been looking through every picture I could find on the i-nets for 15mm bing intakes (I'm looking for a tall one for Puch Magnum wt ZA50, but also ok with standard e50 height as I can put a riser). Here is the reason for the post - am I wrong to think that if you want to place the carb into it's original location you are pretty much forced to use a highly inefficient "90" degree sharp angle design intake? Are there any that are made that are a smooth curve that allows the air to not go through a sharp "elbow"; basic science would indicate that a lot of velocity/throughput is lost by that sharp angle design...

I've only seen one mlm version that had a dual 45^ design...

Please note- looking for intake that places the carb in its original location (or there about) so the plastics still fit...

Anyone know a reason why the sharp 90 design persist over 40yrs of development... (edited)

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

P D /

pdcomm

Sep 10, 2020 03:58PM

> Julian L Wrote:

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

> Anyone know a reason why the sharp 90 design persist over 40yrs of

> development...

Very simple : It's just mopeds . ;)

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Mike Boyd /

Go to branch

boyd

Sep 10, 2020 04:07PM

Yeah a lot of moped design is form over function, these are not highly developed race machines.

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Overpriced Parts /

roffman

Sep 10, 2020 04:29PM

No real difference/I don’t think you’ll notice much difference but if you want you can smooth Feather the inside of a tall 14mm intake for better flow

BTW a tall stock Za50 14mm intake is almost 15mm so after you smooth the 90° bend (which is way over15mm) a little and do a bit more You could have a 16 mm intake

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Jeff Parr /

bigbadbrother

Sep 10, 2020 06:01PM

Have you seen this INTAKE?

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Julian L /

the_hun

Sep 11, 2020 09:09AM

> Jeff Parr Wrote:

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

> Have you seen this INTAKE?

Yep, it is probably better flowing as it is 2x45^ but at that price...hmm, I was hoping to find something that has been formed as a smooth elbow instead of welded straight pipes...

Anyone know if the external diameter of the stock 12MM is the same as the stock 15MM - can I just dremel the wall thinner to increase the inner diameter of a 12MM or have to get me the 14MM and go from there...

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Bas Autowas /

dutchpuch

Sep 11, 2020 09:16AM

If you're using a 15mm bing and you want more speed, the angle of the intake really is the last thing you should look at.

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Julian L /

the_hun

Sep 11, 2020 09:28AM

> Bas Autowas Wrote:

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

> If you're using a 15mm bing and you want more speed, the angle of the

> intake really is the last thing you should look at.

What would come before? I have a 65cc metra, ported, put a boss pipe (budget:(), re-jetted (75 is where it stopped 4 stroking, running 74 jet), up geared (19tx35t), flipped the 2nd gear, what am I missing that should come before the intake that I have not done already...

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Bas Autowas /

dutchpuch

Sep 11, 2020 09:41AM

A decent exhaust would probably be your best option. What speeds are you trying to achieve?

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Overpriced Parts /

roffman

Sep 11, 2020 09:57AM

> Julian L Wrote:

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

> > Jeff Parr Wrote:

>

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

>

> > Have you seen this INTAKE?

>

> Yep, it is probably better flowing as it is 2x45^ but at that

> price...hmm, I was hoping to find something that has been formed as a

> smooth elbow instead of welded straight pipes...

>

> Anyone know if the external diameter of the stock 12MM is the same as

> the stock 15MM - can I just dremel the wall thinner to increase the

> inner diameter of a 12MM or have to get me the 14MM and go from there...

12mm tall intake is 12.7 Inside to start but is the same size OD as 14mm so start boring/dremeling and go straight so you don’t pop through

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Julian L /

the_hun

Sep 11, 2020 10:07AM

Nothing north of 42-45; just want to have bit more power for hills (plenty of around here), I'm running stock crank so trying to keep RPMs down, get more torque

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Chris Straub /

straubzilla

Sep 11, 2020 12:17PM

https://www.treatland.tv/MLM-puch-curved-15mm-BING-intake-p/mlm-puch-bing-intake-620.htm

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Potr zebie /

bullsachs101

Sep 11, 2020 03:56PM

pretty sure any gains (if any) from a smoother intake angle will be insignificant and unoticeable

clutch springs, exhaust and maybe mess around with yer gearing

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Erik Thalman /

aliendu4

Sep 11, 2020 04:52PM

> Chris Straub Wrote:

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

> https://cdn3.volusion.com/vod3d.s9orw/v/vspfiles/photos/mlm-puch-bing-intake-620-2T.jpg

>

> https://www.treatland.tv/MLM-puch-curved-15mm-BING-intake-p/mlm-puch-bing-intake-620.htm

Very tall no clover clearance

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Overpriced Parts /

roffman

Sep 11, 2020 05:07PM

> Erik Thalman Wrote:

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

> > Chris Straub Wrote:

>

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

>

> >

> https://cdn3.volusion.com/vod3d.s9orw/v/vspfiles/photos/mlm-puch-bing-intake-620-2T.jpg

>

> >

>

> >

> https://www.treatland.tv/MLM-puch-curved-15mm-BING-intake-p/mlm-puch-bing-intake-620.htm

>

> Very tall no clover clearance

Clover?

I love Crimson and Clover! I love the vintage tremolo and reverb sounds

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Erik Thalman /

aliendu4

Sep 11, 2020 05:31PM

Side covers lol

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Satan 666 /

pepilapeau

Sep 13, 2020 07:36AM

If you want more power on hills get a circuit pipe and ditch that boss.

Re: Puch 15mm Bing intake orig location - all we get sharp 90degs?

Jay Rivett /

bjaockx

Sep 13, 2020 12:12PM

The single bend in the stock and aftermarket bing intakes are not bad. I like the idea that they would cause more air fuel mixture with an hard angle like that. The ones that are not great are the a35 ones that have almost a z shape. That is too many hard angles.

The circuit pipe is a good suggested for your low end issues.

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