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jpnovak jpnovak is offline
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Join Date: Apr 2000
Location: Austin, TX
Posts: 7,664
I bored some MFI stacks recently. I ended up with a straight bore. I could not fixture the stacks well enough to cut with taper ream. The ream is the easy part. I just did not have enough room to jig the parts. I could not cut the taper by hand. Just some downward pressure on the ream due to tool weight was enough to prevent me from taking a cut.

The drill on an extension worked well. I cut in 2mm steps out to 38mm. be aware. That plastic (phenolic) is really hard and will bind easily. It will heat and expand at the cutting edge and then contract behind it binding the bit.

The throttle bodies are basically a plunge cut followed by a blend with a flap wheel.
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Old 12-12-2018, 07:17 AM
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