Does anybody on the board have a crossported motor in a 1st gen?

 

show us a pic of the porting
iv havnt heard of this

 

IIRC, crossport is when you have small peripheral ports and sideports.
I cant find a picture

 

Never heard of cross ports, peri-ports, yes.

 

What kim is talking about sounds like Peripheral Secondary ports?

I've never heard the term cross port either though. At first it had me thinking a J-Bridge.

 

Sorry, thats the only name I've heard it called. I don't have a picture but I know that the red Scoot FD3S is crossported and I was wondering if anyone with a first gen has this done.

 

I did some searching, and cross port looks like a regular 4 or 6 port motor, but with additional small peripheral ported secondaries. Like Kim had suggested.

 

See, I'm familiar with those where the peripheral are small but when I was wathing the video the guy from Scoot said that he had a regular 13b peripheral port with and also sideported(streetport) the motor for the low end. His emphasis was on streetability so I'm assuming he had some kind of setup where at lower rpms the peripheral ports are closed off and then they open up at a higher rpm.

 

Yes, they're peripheral ported secondaries. If the secondary of the manifold is not open at low RPM, the peripheral ports aren't used, and low end is retained. This holds true in setups like mine with the Holley 4-barrel carb. The secondaries aren't in use at low RPM, since the manifold is divided and the secondary throttle plates are closed until about 3500 RPM. The same can be done with a throttlebody setup, or using a system with electronically controlled butterflies in the secondary runners. The only downside to something like this, is if the secondary valve/butterflies fail somehow, the car will fall on it's face in higher RPMs. I would guess too it could be a PITA to setup correctly.

Funny you should mention it though... As the guy doing my porting suggested it for my new motor. I'm not sure I want to go that wild however, and I don't have the time/money/desire for a custom intake manifold. I'll be instead going with a half-bridgeported motor.