A 3.5" hole saw will cut a circular piece of metal and measure 84MM which is about what you need.

I made one out of some SS from work and put the edges to a bench grinder to put a knife edge on both sides. I will get you some pics later today if I vget the chance.

 

thanks again weed.

anyone know the reasoning behind knifing the edges?

 

it is to allow air past the blade faster due to less restrictions. In other words, aerodynamics

 

 

Good luck with that knife edge there weed, I ABSOLUTELY HATED mine with it on there. WAY to touchy of a throttle for me specially driving in rush hour traffic.

 

You would be 100% wrong here. There is most definitely a benifit with it being tapered, you get a venturi effect which sucks in more air and makes the throttle responce much better and gives the truck some much needed pep. Unless you are going with a nice cam/heads a full bore ported TB is going to be useless on a stock motor.

 

Truckin, I know you didnt like yours but I thought I would like the more response. I havent put the new plate in yet as I left my TB out at the shop. :OH::

But I will let you know. if not then I can always cut another. A tip from anyone trying to cut one from SS, keep the blade water cooled. I literally had to pour water slowly on my hole saw as I was cutting to keep it cool and cutting.

 

how thick was the piece of ss you used? and i'm assuming ss is stainless steel?

 

Hmm......IDK. Either 1/8 or 3/16 I guess. I would have to measure it with the calipers. I cut out the front of the shaft of my TB shaft also.

 

can't just use the orginal shaft?
sorry bout all the questions, i have one TB so first shot i better get it right or i have no truck untill fastman mails me a new one haha