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Engine basics => Engine set up tips => Topic started by: Motorman on June 16, 2020, 10:59:40 AM

Title: OS LA 25 Venturi
Post by: Motorman on June 16, 2020, 10:59:40 AM
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Title: Re: OS LA 25 Venturi
Post by: Dane Martin on June 16, 2020, 12:48:21 PM
OS part number 22312000, 6mm ID


https://www.towerhobbies.com/cgi-bin/wti0001p?I=OSMG9252
Title: Re: OS LA 25 Venturi
Post by: Brett Buck on June 16, 2020, 12:51:02 PM
Quote from: Dane Martin on June 16, 2020, 12:48:21 PM
OS part number 22312000, 6mm ID


https://www.towerhobbies.com/cgi-bin/wti0001p?I=OSMG9252

  6.5mm/.256x"


   Brett
Title: Re: OS LA 25 Venturi
Post by: Dane Martin on June 17, 2020, 04:18:32 PM
Towers description is 7mm ID. But they say 6mm on the small...
I believe I used a letter I drill, which is .272. But if it is 7mm, that .276
Title: Re: OS LA 25 Venturi
Post by: Brett Buck on June 17, 2020, 06:35:00 PM
Quote from: Motorman on June 16, 2020, 04:17:28 PM
I've got one that measures .260" so I guess that's it. What's the larger one 7mm?

 The LA only comes with one venturi, it's the same nominal 6.5mm as on the 20/25FP. All that I have measured are 6.52 mm/.257 to three significant figures, using a Starrett small hole gauge set and a micrometer. None of them are *exactly* round, either but thats in the noise for any practical purpose.

  Brett
Title: Re: OS LA 25 Venturi
Post by: Dane Martin on June 17, 2020, 06:57:29 PM
Quote from: Brett Buck on June 17, 2020, 06:35:00 PM
The LA only comes with one venturi, it's the same nominal 6.5mm as on the 20/25FP. All that I have measured are 6.52 mm/.257 to three significant figures, using a Starrett small hole gauge set and a micrometer. None of them are *exactly* round, either but thats in the noise for any practical purpose.

  Brett

Ah! You're correct. I forgot about that. The FP had a large and a small. Well, I guess the 35fp had a medium. But the LA is the 6.5 regardless of the size.
Title: Re: OS LA 25 Venturi
Post by: Dane Martin on June 19, 2020, 08:44:27 AM
Quote from: Motorman on June 19, 2020, 07:19:54 AM
I must have polished/modified mine to be ,003 bigger therefore ruined it lol.


Motorman 8)

Throw it out. Or throw it in an envelope addressed to me, so I can throw it out for you...
Title: Re: OS LA 25 Venturi
Post by: Brett Buck on June 19, 2020, 09:52:16 AM
Quote from: Motorman on June 19, 2020, 07:19:54 AM
I must have polished/modified mine to be ,003 bigger therefore ruined it lol.

     This is the scintillating wit we have come to expect.

     Actually, if you made it .003 bigger, you *would* have problems in some cases. I have seen people pick up 25-30 points *in one flight* changing their venturi by .005.

     But I am sure *you* know better...

    Brett