New Product: Rotary Extreme Big Bore Throttle Body
Thread Starter
Senior Member
Joined: Nov 2001
Posts: 1,009
From: Bayarea, CA
20% increase in flow area, not 20% increase in HP.
The flow area increase can be calculated easily with simple math.
When it's dynoed, it's going to be back to back. The part will be swap on the dyno.
There is no core exchange because you will need to send yours in to be modified.
Chuck
The flow area increase can be calculated easily with simple math.
When it's dynoed, it's going to be back to back. The part will be swap on the dyno.
There is no core exchange because you will need to send yours in to be modified.
Chuck
Originally Posted by DUB' date='Dec 16 2004, 09:19 AM
20% increase is that a guess or is there data?
what was the last dyno # on the customers car?
will there be back to back runs? <---that's what would sell it for me.
I assume there is a core exchange?!?!?!?!
what was the last dyno # on the customers car?
will there be back to back runs? <---that's what would sell it for me.
I assume there is a core exchange?!?!?!?!
Senior Member
Joined: Mar 2003
Posts: 2,436
From: Disclaimer: posts made after 11AM are most likely alcohol induced. Please disregard unless very funn
Chuck,
Do you think there will actually be any difference in the dyno runs since the UIM and LIM runners are smaller than the stock TB plates already? I have big bore TB that i haven't had a chance to dyno yet..... but i don't know if i'll see any real difference. Even if the UIM/LIM are ported...... the stock TB plates are bigger than the surrounding metal on the runners would allow to be port matched.....
Do you think there will actually be any difference in the dyno runs since the UIM and LIM runners are smaller than the stock TB plates already? I have big bore TB that i haven't had a chance to dyno yet..... but i don't know if i'll see any real difference. Even if the UIM/LIM are ported...... the stock TB plates are bigger than the surrounding metal on the runners would allow to be port matched.....
Senior Member
Joined: Oct 2004
Posts: 110
I assume there is no gain in HP since the TB flows plenty for our engines. Don't forget the TB feeds both rotors and only one a time uses the charge. Our engines can consume 400cfm at 9000 rpms at best. A 40mm TB flows about 90 cfm. We have 3 of them which makes it 270. Times 2 will give you plenty. The real question is how much do we flow through the primary vs secondary? If someone puts a mega port on the primaries he might run out of air but that is still doubtful.
Chuck,
it would be nice to have some effidence proven the theory wrong.
CW
Chuck,
it would be nice to have some effidence proven the theory wrong.
CW
Member
Joined: Jan 2002
Posts: 37
Originally Posted by rotaryextreme' date='Jun 10 2004, 06:59 PM
I guess everything is possible but I rather have it CNC machined then trusting my steady hand. I simply can't sell something that's grinded by hand when precision is a must. I don't have a CNC machine shop so I have to out-source on this mod. The CNC machine shop did a lot of work on this mod. They made the CAD program to machine the throttle body and also the throttle plate. They made a fixture so they can clamp down the throttle body onto the CNC machine. $400 is not cheap but there is a lot of work involved behind this.
If you can do it yourself, it's the best. Everyone likes to save money. Me too.
Chuck Huang
If you can do it yourself, it's the best. Everyone likes to save money. Me too.
Chuck Huang
I don't see where you need a MASTERCAM program to machine the throttle body. Am i missing something here?
Thread Starter
Senior Member
Joined: Nov 2001
Posts: 1,009
From: Bayarea, CA
The edge of the throttle plate is not flat. It's at an angle. You also want to make sure the the plate will seal the throttle body completely when it's closed, or you will have super high idle if it's leaking. This is the reason you can't really use a grinder to do it unless you are as precise as a CNC machine.
Chuck
Chuck
Originally Posted by cafe' date='Jan 16 2005, 02:08 PM
I don't see where you need a MASTERCAM program to machine the throttle body. Am i missing something here?
