Every
day, Brush Research advises customers how to choose the right flexible honing
tools. And for many years, we've made grit recommendations as part of that
process. Based on our experience, this is usually a pretty straightforward
proposition. So how much grit do you really need for automotive applications?
In the case of automotive
combustion cylinders, 120 grits works for older cast ring sets, and for cases
where the cylinder has been re-bored and is a little rough. For general
deglazing, 180 and 240 grits are good choices. They're also good when
the cylinder is not going to be bored or honed.
Life in the Fast Lane
Often, 320 grits are used in
high-performance applications with chrome molly rings. I sometimes see guys
running dragsters who ask for 400 grits, but they are re-honing after every few
runs. So, you can imagine my surprise when the phone started ringing off the
hook asking for a 4" Ballhone made with Levigated Alumina, a special abrasive
for some industrial applications. Brush Research Manufacturing makes the
Flex-Hone in 11 abrasive types and 8 grits, but this is the first time that
anyone has asked for Levigated Alumina for a big block Chevy.
Easily identifiable by its
white abrasive, Levigated Alumina comes in only one type: extra fine
(approximately 1000-1200 grits). I gave them my usual spiel about maybe this
being a little too fine, but they were adamant. I scratched my head a few times
knowing the customer is always right and filed it away for future thought - until
the phone kept ringing with more requests.
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