Porting EGR spacer?

[jaymac]

I will be converting and using an Explorer 65 mm TB, and the Explorer intake.
Question is: can I port my stock EGR spacer instead of buying a 65mm unit?
If so, what kind of bits will I need to port it out, or is there anything in particular I should know before attemting to do this?
Thanks,
Jeremy

 

[giddyup306]

Tried it once. It's a dumb idea. You will spend far less on Ebay getting a 65mm spacer than investing countless hours trying to get a stock spacer bored 5mm.

 

[jaymac]

"hours", really?
What happened?

 

[93RiceKillinGT]

I can port one in 5 min! I have a program speifically made for porting an EGR spacer to 65 MM 70 MM and 75 MM on my CNC vertical Mill. Let me know if you are interested I might even have one on the shelf.

 

[jaymac]

I'm def. interested!
Let me know if you got one and/or how much!
Thanks,
J

 

[tmoss]

I used a 3-stone cylinder hone.

 

[jaymac]

I used a 3-stone cylinder hone.

can I pick that up at an auto parts store only?
How long did that take?

 

[tmoss]

Yes you can, but I already owned one from eons ago. The stones cost me less than $10. A hone will not be real cheap. Compare it to the price 93ricekiller would charge you.

 

[jaymac]

how would the cost and effort level and results compare to trying it w/ an air tool and a porting bit?

 

[tmoss]

I wouldn't even try that and I port intakes all the time.

 

[illwood]

I'm with 91RiceKillinGT and Tmoss. The hone will keep things pretty concentric as long as the original bore was good. If I had to do it, I would go with 91RiceKillinGT's route of using a CNC mill. Hell, I could probably code it and cut it in 10min if I had a probe on the mill and the EGR spacer fit well in a vise.

 

[jaymac]

Well, at my brother-in-laws shop, he has a router built upside-down into a workstation, and used 4 different bits and alot of WD-40 to bore the stock EGR to 65 mm, and it's smooth as a baby's bottom! Took about 10 minutes!