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What size drill bit for spark plug wires or boots?

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Can anyone give me the size of drill bit I need to use for spark plug wires and for spark plug boots? I have checked some of the suppliers sites but can't find any information regarding this.

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It seems I always needed more #80 bits for my wire holes. That or the higher 70 bits works for most spark plug wire sizes. It's easy to figure out .. get the size of the wire you use and use that to get a drill slightly larger. A #60 to #80 drill set is very handy for 1/25 models.

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Posted · Report post

I think I use a #75 for my plug wires.

Tim

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Posted · Report post

This is where you need a cheap set of dial calipers($10. to $30.00). You measure whatever wire you have and then grab the corresponding size drill bit. An index filled with bits is very handy to have. The x-acto index has the number size and the inch size printed right on it. An investment in tools is an investment in your modelbuilding skills and results.

Don't forget your spark plug boots! They can be easily simulated with a short piece of insulation from a slightly thicker piece of wire.

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I was thinkin a distributor by parks or detail masters or if anyone knows any better ones let me know. Im building a Lincoln LSC pro street by Revell.

What size drill bits and whos got a good deal on those pen vices?

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Posted · Report post

Try a #70 bit... and it's a pin vise. Micro Mark has them, but you might be able to get one in a well stocked hobby shop.

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Hobby Lobby sells them, too.


As far as size, measure the wire diameter and use a slightly larger drill bit. I would suggest you pick up a dial caliper, too, as they are very handy for measuring:

dial.jpg

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Posted · Report post

You can get a pin vise just about anywhere. Get a decent one though - the tiny bits are hard to hold if the chuck parts don't align well (the four metal parts that converge on the bit to hold it in place). X-acto and Tamiya both make nice ones.

As far as diameter, what diameter wire are you replicating? In scale wiring usually looks a little to small to the eye (8mm wire scales out to .012 in - a number 80 drill bit is .0135). Also, don't go big - I have seen models with "garden hose" for wires and that distracts more than adds to the look. I prefer 77 or 76 (.018 or .020), but that's just me.

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Good suggestions above. I'd saw get a set of drill bits like #61 - #80. I use just about all those.

A caliper is also strongly recommended, but they are commonly available with digital readouts.

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Posted · Report post

Thanks a million. Thats wut I was lookin for.

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FYI....Harbor Freight has a digital caliper on sale all this month at $11.99 with coupon. Regular price is $29.99, coupon is available on line, I believe - and may be available in the 'flyer' bin at the store entry....'Z'

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Maybe I should have mentioned above I was and still am a Machinist for 14yrs now. I got plastic, digital(i dont like), mititoyo japanese steel linear calipers as well and inside/outside mics, bore mics, etc. See my avatar, Im sitting in the enine bay of my car, rebuilding the whole motor. I doubt im gonna break out any measuring tools for this model. Black and white knowledge isn't the same as experience!!! You guys put together some good scale stuff!!!! Thats what Im after :)

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I was thinkin a distributor by parks or detail masters or if anyone knows any better ones let me know. Im building a Lincoln LSC pro street by Revell.

What size drill bits and whos got a good deal on those pen vices?

Morgan Automotive Detail make by far the better distributor

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Posted · Report post

You don't know length of those by chance? This pro stock motor's Distributor is mounted horizontal as opposed to a regular V8, that sits vertical. It sits under the cold air intake, pointing towards the driver side. Base of dist is where it should be, up front, just sits sideways. To reach the passenger side plugs their gonna have to be super long.

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I agree that Morgan Automotive detail makes the best distributors.

I picked up a set of calipers cheap off ebay.

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Posted · Report post

a set of good calipers is a very handy tool to have on the workbench

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Posted · Report post

the longest I ever cut the wires, before fitting is 2 inches for the farthest away plug. But I normally cut all pieces of wire to this size, easier to handle.

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You don't know length of those by chance? This pro stock motor's Distributor is mounted horizontal as opposed to a regular V8, that sits vertical. It sits under the cold air intake, pointing towards the driver side. Base of dist is where it should be, up front, just sits sideways. To reach the passenger side plugs their gonna have to be super long.

M.A.D wires are 2 1/2"

parts by parks are 2"

pro tech are 2 1/4 "

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Posted · Report post

I've been using a # 69 drill bit for years to drill holes for spark plug wires and it seems to work for me.

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a set of good calipers is a very handy tool to have on the workbench

Im seeing this now!! :)

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For those of you Canada, Princess Auto has the Pin Vises (they call them jewelry drills) for $9.99 with 3 bits. Mike

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