Porting Exhaust, O2, and Turbo..

[Jhoe]

I jus got a die grinder and some stones and the stones are taking forever. I've been told I can use a diamond carbide bit for porting my turbo, exhaust manifold and o2 housingm but then I was also told i should never use a carbide bit.
VFaq.com says use a carbide bit, what should I got with?

will a diamond carbide or a carbide bit do any harm when porting (if done correctly)
I was told that the diamond bit will last longer than a regular bit...
(And where can I get a new 2h exhaust manifold from...)

Thanks

 

[KenTSIII]

get the manifold from www.partznet.com & use the carbide bit (don't know about the diamond one). They work really well. Then use the stones to smooth out the roughness left by the carbide burr.

 

[RamenPride]

Originally posted by Jhoe
I was told that the diamond bit will last longer than a regular bit...

of course it will last longer. cast iron is pretty hard, but compared to a diamond...... but I'm pretty sure it will cost more $$$ also.....

 

[spyderman]

Carbide is sufficient for cast iron. Also get some machinist blueing for the port to port flanges. Clean all surfaces, coat with blueing, line up a new gasket and scribe the flange along the outline of the gasket opening. Grind to the outline, smooth with a stone and do a through wash and dry to remove ALL grinding residue. Take your time and don't let the carbide get too hot. When you use a common denominator (gasket) to determine maximum port sizeing it will ensure a good match and minimum turbulence at the interfaces.

 

[twistedtsi]

i used the diamond drill bit and it worked really good it threw the cast iron like nothin then i used a gringing ball to smooth it out then a wire wheel to polish it cam out really good and it works