How to: Bore your intake manifold
07-20-2007, 11:36 AM
#1
0.0 BAR
Thread Starter
Join Date: Oct 2003
Posts: 0
How to: Bore your intake manifold
i may not use this intake manifold, but i thought i might bore it out just incase i don't get around to building a new one before the engine is in the car.
setup on mill:
first setup the manifold so that the t/b mounting surface is flat, then indicate the port to find the center, or as close to center as you can get. the stock casting isn't perfectly round.
measurement before porting:
oem tb measurement:
replacement tb measurement:
comparision between the two... i will have to modify the replacement to add the map sensor on top. shouldn't be hard to do.
i couldn't fit a proper boring head in the limited travel of my mill, so i opted to use this small flycutter. here it is making the second cut. worked fine with the quill feed engaged.
finished dimesion (slightly larger than the tb):
as you can see the casting isn't exactly even all around so make sure you go deep enough to get all the material to make it a smooth transition.
setup on mill:
first setup the manifold so that the t/b mounting surface is flat, then indicate the port to find the center, or as close to center as you can get. the stock casting isn't perfectly round.
measurement before porting:
oem tb measurement:
replacement tb measurement:
comparision between the two... i will have to modify the replacement to add the map sensor on top. shouldn't be hard to do.
i couldn't fit a proper boring head in the limited travel of my mill, so i opted to use this small flycutter. here it is making the second cut. worked fine with the quill feed engaged.
finished dimesion (slightly larger than the tb):
as you can see the casting isn't exactly even all around so make sure you go deep enough to get all the material to make it a smooth transition.
07-20-2007, 03:20 PM
#7
Guest
Posts: n/a
Re: How to: Bore your intake manifold
Originally Posted by klyph
Next writeup: How to CNC machine a complete engine block 
Good writeup, but we need a cheap nog how to do it with a die grinder/hone/CDM power drill writeup.
Good writeup, but we need a cheap nog how to do it with a die grinder/hone/CDM power drill writeup.
07-20-2007, 03:48 PM
#10
3.0 BAR
Join Date: May 2006
Posts: 1,967
Re: How to: Bore your intake manifold
Is it a bitch to set that flycutter up to the right radius? I have some machining experience but haven't done any boring or stuff like that.
You shop looks sick. Someday I want to have my own automotive machine shop, parts store.
You shop looks sick. Someday I want to have my own automotive machine shop, parts store.
