Engine basics > Engine set up tips
Venturi inside diameters
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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