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Post by pete130 on Mar 27, 2018 3:09:23 GMT -5
Im wanting to know will it change the way the motor will run if i extend inlet by 30mm. im using a rear mount carb and it gets in the way of starter motor. i could blank starter off. But i would like the electrical start a lot easier.Im using a stage6 manafold and have this i was thinking of using to move carb out of way and maybe level out a bit sits on a angel  |
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Post by 190mech on Mar 27, 2018 4:12:04 GMT -5
It should run fine,I have built some really long intakes that won some races..
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Post by moofus02 on Mar 27, 2018 8:50:32 GMT -5
A friend used that stage 6 intake. He used a shortcase engine mount that had a rear carb and long intake. The mount bolt went all the way across and caused issues like your starter is. He used a 45° pvc elbow to get up over and behind that bolt with the carb plus it leveled it out. He wasn't running a starter. Seemed to work well
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Post by jackrides on Mar 27, 2018 14:22:50 GMT -5
Some random thoughts with hope they're helpful: Uniform inside diameter carb to port is very important. A gradual bend (to clear starter) probably wouldn't hurt anything. A smooth inside rubber hose (stiff enough to not 'pulse' in diameter, or collapse from vacuum) has been used successfully as an intake. Some motorcycle carbs were made with the float bowl at an angle to the throttle slide so the float could sit flat while the throat was at an angle. There was fairly recent posts on the relation of rpm (pulse frequency) and fraction of wavelength (port length) in some different engines. Might give some good background.
Post your results!
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Post by pete130 on Apr 30, 2018 21:42:11 GMT -5
Thanks for all input im thinking of the pvc 45 bend to get carb level and would fix hitting starter motor problem as well
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Post by ThaiGyro on Apr 30, 2018 22:40:57 GMT -5
Hey pete130, like 190mch said, 30mm should be no issue...unless you use the connection you mentioned. PVC does not help.
Keep this in mind with any airflow, especially in "tubing". Straight pipe with air passing through will create a boundary layer, because the air will stick to the wall surface. As that air flow tries to increase, the boundary layer does as well, meaning that a 2" PVC will flow far less air than a corrugated pipe of the same diameter.
We use washing machine drain hoses here...cheap, plastic and bendable. They flow air well, but you must be good at joining them together and to your box. The corrugated tubing helps break up any boundary layer by creating turbulence. If only using a PVC elbow, maybe less of an issue.
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