Engine basics > Engine set up tips

Venturi inside diameters

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Robert Zambelli:
Assuming a Super Tiger size spray bar (around .157 diameter?), I'd like to hear from you regarding you best choice(s) for a venturi ID for some of the more popular engines:

Max S 35 -
Max S 25 -
FP 40 -
FP 35 -
FP 25 -
ST 35 -
ST 46 -
ST 56 -
ST 60 -
(STs are all baffle piston types)
Max H 40
LA 25 -
LA 40 -
LA 46 -
And any others you might think of!

RandySmith:
Max S 35 -   .265 to 300 restrictor  depends on muffler
Max S 25 -    260 to 281  depends on muffler
FP 40 - 265 to 281  restrictor  depends on muffler
FP 35 - .265 to 275 restrictor
FP 25 - 260 to 270  restrictor
ST 35 -  .157 to .165 venturi       or  265 restrictor
ST 46 - .165 to .170 venturi        or  265 to 281  restrictor
ST 56 - 175  to .183 venturi     or  275 to 285 restrictor
ST 60 -.181  to .190 venturi       or  275 to  295 restrictor
G51  loop charged   .175 to .181 venturi    or  270 to 281  restrictor
(STs are all baffle piston types)
Max H 40  265 to 290 venturi depends on muffler
LA 25 -  260 to 280  depends on  muffler
LA 40 -  265  to 281  restrictor
LA 46 - 270 to  285 restrictor  depends on muffler

Robert Zambelli:
THANKS, Randy - just what I needed.
Bob Z.

Dan McEntee:

--- Quote from: RandySmith on January 26, 2021, 06:31:25 PM ---Max S 35 -   .265 to 300 restrictor  depends on muffler
Max S 25 -    260 to 280  depends on muffler
FP 40 - 265 to 281  restrictor  depends on muffler
FP 35 - .265 to 275 restrictor
FP 25 - 260 to 270  restrictor
ST 35 -  .157 to .165 venturi
ST 46 - .165 to .170 venturi
ST 56 - 175  to .183 venturi
ST 60 -.181  to .190 venturi
G51  loop charged   .175 to .175 venturi
(STs are all baffle piston types)
Max H 40  265 to 290 venturi depends on muffler
LA 25 -  260 to 280  depends on  muffler
LA 40 -  265  to 281  restrictor
LA 46 - 270 to  285 restrictor  depends on muffler

--- End quote ---

     Maybe this needs to be pinned up at the top wit6h the other stuff.  Between this info and a good search f the section you should be able to set up just about anything.  Only thing missing is ID for a restrictor set up for a ST.60  and G.51.

  Type at you later,
  Dan McEntee

frank mccune:
           Hi: 

           I too think that Rand’s list should be listed at the top.

           

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