MicroSquirt.com read only forum (Jan.15,2018)

citroaxgtr wrote:can anybody help me with my third reply about the pipes please?.

Those are the Vacuum Ports.

Thanks for the numbers. Did you get all of that just from what I gave you or do you have a data base that had the bore and stroke?

I looked up the bore and stroke of your engine on the internet.

Is it important to try to tune on an earlier pulse? A 1.5" diameter intake runner would be large ...

whittlebeast wrote:those are factory traction control or at least HP limiters.

AW

Actually, the secondary butterflies were there to provide more consistant power at lower RPMs.

The TB's were a bit large for the motor at lower RPM ranges, so the Secondaries smoothed out the throttle response

Tuned Intake Runners

Peak Power Target @: 4500 RPM

Tuned Manifold Runner
Second Pulse Length: 24.00 In. 609.6 mm
Third Pulse Length: 21.56 In. 547.5 mm
Forth Pulse Length: 16.44 In. 417.7 mm
Fifth Pulse Length: 12.00 In. 304.8 mm


Minimum Port Cross-sectional Area Required

Peak Power ...

The Suzuki injectors are a large black hole of information.

RC Engineering says that all of the Suzuki Injectors, from the GSX-R 600 to the Hayabusa, flow about 240cc at 43psi.

According to Keihin, the numbers on the side of the injectors are basically date codes, not model numbers.

FIntruder wrote: My project is a low revvin' motorcycle engine without much room for runner length. The lower the rpm, the longer the runner needs to be for peak.

What is your max power RPM going to be?

What size Engine?

http://www.rossmachineracing.com/index.htm

That is one place that sells parts.

What exactly are you trying to do? ITBs on a V8?

Oh....sorry, I forgot to mention that. I ment to but I quess I got side tracked.

That length is from the centor of the valve stem to the opening in the plunem of the atomosphere.

This formula isn't the most precis...it just gets yo close to where you need to be.


OK, cool! Thanks for the ...

That is very interesting figures you posted up.
If that the length of the runner itself or the length from the open end of the runner to the valve?


I have been using a formula out of the book Desktop Dynos by Larry Atherton.

He talks about tuning the intake length for the different pulses that ...

According to popular belief by engine tuners, this is the best way to get a good air/fuel mix..

However, since it is not very manufacture-friendly to build that way, most do not do it.