extended intake manifold????

[inked1974]

With my newest build I have ran out of space to cram the carb into the frame. Without cutting out my mount (welded in) and re-positioning the motor I thought I would try to extend my intake manifold. I know this is not ideal but what are my performance setbacks going to be? Is it something I can tune with carb adjustment?

 

[DuctTapedGoat]

I don't know the mechanics behind it - but increasing the intake length will take off your top end, and put it in the bottom end torque.

It has to do with distance and atomization and such.

 

[inked1974]

Not certain if the intake length will have adverse effects yet. Installed it last night on a fresh out of the box Skyhawk GT2 with CNS carb and she popped right off. Of course she was spitting and sputtering prior to cruedly tuning the carb in. Tonight I will button down the wiring, tidy up a bit and see where it goes from there. All in all I am really not looking for dragster speed with this stretch cruiser so a little off the top end would be just fine with me.

 

[inked1974]

Just in case anyone is looking at this with the same question I will continue to document my progress. Night #2 of trying to tune this carb has failed. Still spitting and sputtering while not choked and at mid throttle. idle sounds super sweet but seems to run like it hates me. I may re-mount the motor to accomodate the carb in the frame with stock intake.

 

[ducedave]

Just in case anyone is looking at this with the same question I will continue to document my progress. Night #2 of trying to tune this carb has failed. Still spitting and sputtering while not choked and at mid throttle. idle sounds super sweet but seems to run like it hates me. I may re-mount the motor to accomodate the carb in the frame with stock intake.

CNS carb are funny it's not your intake-read up on CNS tuning

 

[wheelbender6]

The "Superstock Dodge" that Jan and Dean sang about had very long intake runners. It worked for them.

 

[biknut]

You're going to need to drill your main jet out to get it to run right. Stock is = to about a #71 drill bit. I suggest going to a #64 and tune from there. Be prepared to drill it even a little bigger.

 

[Pucksterpete]

Just in case anyone is looking at this with the same question I will continue to document my progress. Night #2 of trying to tune this carb has failed. Still spitting and sputtering while not choked and at mid throttle. idle sounds super sweet but seems to run like it hates me. I may re-mount the motor to accomodate the carb in the frame with stock intake.

So, Whats the latest on the intake for the bike?

Tnx,

Pete

 

[inked1974]

havnt really had too many issues with this intake, It is still running. I believe that most of my tuning issues were just getting to know the CNS but after some messing around with the carb it runs just fine. I did a few plug chops and decided not to rejet, color was staying a caramel tan. I am now running Opti2 and loving it.

 

[talbotti]

You're going to need to drill your main jet out to get it to run right. Stock is = to about a #71 drill bit. I suggest going to a #64 and tune from there. Be prepared to drill it even a little bigger.

i wonder how you can dril 0.71 mm hole to 0.64mm

 

[rohmell]

i wonder how you can dril 0.71 mm hole to 0.64mm

It's drill bit size #71 to #64. The smaller the drill bit number, the larger is its size.
Drill Bit Size Chart

 

[talbotti]

It's drill bit size #71 to #64. The smaller the drill bit number, the larger is its size.
Drill Bit Size Chart

sry i thought you mean by the numbers mm sizes