Super Jet ET SJ Billet BigBores

[Schmidty721]

What you dont see it the area under the curve,

This is what matters for the type of power we are looking for.

 

[kevbo]

This is what matters for the type of power we are looking for.

Power made before 4500 follows displacement very closely for a given port height. On a ski this is throttle response only. Between 20%-30% of the power and thrust comes directly from the pipe, more so with higher ports.

 

[E-Tech]

108 foot lbs of torque at 5500 rpm and 118 at 6000. this is where alot of the power is needed for FS

 

[kevbo]

108 foot lbs of torque at 5500 rpm and 118 at 6000. this is where alot of the power is needed for FS

Yes, this is where the 155 pumps start working well.

 

[hink320]

Yes, this is where the 155 pumps start working well.

Yup, I found that out with this motor. Today I turned the timing back up to ET's specs that he used on the dyno and it really woke this motor up. People thought it was snappy at WF, it's even more so now. First flip I tried it launched so hard my feet came right out of the holds, I went right over the bars and the ski landed behind me. It's spinning the 13/19 in the 155 no problem, I'm thinking about going up a pitch so it's not so crazy down low.

 

[Pablo]

That's a big statement when ur spinning a 13/19 in a 155. Nice work ET.

 

[glennbbautomachine]

108 foot lbs of torque at 5500 rpm and 118 at 6000. this is where alot of the power is needed for FS

And what combo are these numbers from?

 

[E-Tech]

And what combo are these numbers from?

ET Billet 1107, PHP light 10mm crank 190 psi, 49 full spec's. PHP intake mani, MSD TL, V-Force 3's. PF pipe.

 

[speedysprocket]

How did you come up with your port timing specs?

 

[E-Tech]

How did you come up with your port timing specs?

From years of knowing, Starting on the dyno i started low and worked up wanted to see until i started to lose down low then when back to the last setting to a happy medium of broad power.

The EX ET manifold is also a huge gain also in the mid from 5000 to 6500 a gain of 15 ft lbs from 5300 to 6000 The HP # is not included in all the above power listed in this thread. I will be starting a new thread when the time is comes and all the gains.

 

[stefan]

Subscripe.

 

[speedysprocket]

From years of knowing, Starting on the dyno i started low and worked up wanted to see until i started to lose down low then when back to the last setting to a happy medium of broad power.

The EX ET manifold is also a huge gain also in the mid from 5000 to 6500 a gain of 15 ft lbs from 5300 to 6000 The HP # is not included in all the above power listed in this thread. I will be starting a new thread when the time is comes and all the gains.

Cool, good deal.
Can you make that manifold to fit Polaris cylinders...?

 

[Kawastyler]

The new manifold will be build from 2 cast pieces or cast as one piece???

 

[lerott]

I love your comparison in torque between different parts in the same platform, very interresting

 

[E-Tech]

The new manifold will be build from 2 cast pieces or cast as one piece???

Will be 1 cast piece.

 

[wanderer1]

Will be 1 cast piece.

Will you have it setup to run wet or dry like the WDK billet manifold?

 

[sneds]

Great thread.

 

[E-Tech]

Will you have it setup to run wet or dry like the WDK billet manifold?

Yes! wet works much better low, mid and even topend power on the ET 1107.

 

[speedysprocket]

Yes! wet works much better low, mid and even topend power on the ET 1107.

Any hope for a manifold spaced for Polaris cylinders...?
And do you use the PFP chamber?

 

[waxhead]

The adaptor from an octane will make it fit a yamaha pipe will it not