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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 6th August 2018
Curbside Curbside is offline
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Default Blow-through Mikuni setup?

Looking at running a turbo on my bike (carb'd) and will need to set the carb up for use as a "blow-through". The carb is a Mikuni HSR42.

Can anyone point me in the right direction as to where I need to start with this?
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Old 6th August 2018
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All of my carbed were draw through
Because;
You have to keep the float bowl at the same pressure as the carb mouth.
And your fuel pressure must be slightly higher than the carb inlet.

The bowl vent should fine for the first and there a pressure referenced fuel pumps available.

And the y-pipe needs to be 321 grade stainless or your second one will be.

Sam
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Old 7th August 2018
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after market fuel injection.
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Old 7th August 2018
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Don't you run into issues with fuel not completely vaporizing, and then ending up inside the intake tract?

Quote:
Originally Posted by SammyD View Post
All of my carbed were draw through
Because;
You have to keep the float bowl at the same pressure as the carb mouth.
And your fuel pressure must be slightly higher than the carb inlet.

The bowl vent should fine for the first and there a pressure referenced fuel pumps available.

And the y-pipe needs to be 321 grade stainless or your second one will be.

Sam
#6062
20 years blown
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  #5  
Old 8th August 2018
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SammyD SammyD is offline
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I never worried about that.
The turbo does a fine job of mixing.

Just make sure the plenum has smooth corners.

Sam
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