Hi, I'm new to the forum. I've kind of been hiding in the background for a little while now. Reading the incredibly useful/in depth information here.
I have a diy project I'm working on, which is porting an intake manifold for a gm l86 engine. Designed for a truck, low end torque. Runners/ports need nothing except to be cleaned up. But I'm looking at possibly opening it up for a 95mm tb (stock 87mm).
It's designed with the throttle body pointing down at a 15 degree angle with the manifold throat sitting level. So right off the bat the throat has a smaller cross section then the overall tb (not counting the blade assembly). I think this probably enhances performance, but it's an unknown.
My real question is how imperative is shape to the manifold throat?
I understand that as it sits, it's designed to work perfectly for the given application. But I've come up with something that alters the overall shape and direction of airflow in attempt to make are larger throttle body worth while.
Basically I'm opening up the bottom of throat so it has a true 87mm bore. But I can also router down the sides (90 degrees off the tb face). Going from nothing and gradually increasing so that it changes the wall shape to a straight shot to the plenum.
I just have an earlier picture from my test peice, but I think it should be enough to clarify what I'm saying. It also doesn't show the bottom opened up..
Any and all advice is appreciated. If I'm doing more harm then good, I do want to know about it!
Thanks
I have a diy project I'm working on, which is porting an intake manifold for a gm l86 engine. Designed for a truck, low end torque. Runners/ports need nothing except to be cleaned up. But I'm looking at possibly opening it up for a 95mm tb (stock 87mm).
It's designed with the throttle body pointing down at a 15 degree angle with the manifold throat sitting level. So right off the bat the throat has a smaller cross section then the overall tb (not counting the blade assembly). I think this probably enhances performance, but it's an unknown.
My real question is how imperative is shape to the manifold throat?
I understand that as it sits, it's designed to work perfectly for the given application. But I've come up with something that alters the overall shape and direction of airflow in attempt to make are larger throttle body worth while.
Basically I'm opening up the bottom of throat so it has a true 87mm bore. But I can also router down the sides (90 degrees off the tb face). Going from nothing and gradually increasing so that it changes the wall shape to a straight shot to the plenum.
I just have an earlier picture from my test peice, but I think it should be enough to clarify what I'm saying. It also doesn't show the bottom opened up..
Any and all advice is appreciated. If I'm doing more harm then good, I do want to know about it!
Thanks