cylinder boring

This topic has 12 replies, 10 voices, and was last updated 11 February 2020 at 13:42 by Martin Kyte.

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11 February 2020 at 08:35 #451664
Philip Burley
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@philipburley44197
Hello .. I am about to start boring the cylinder for my Red Wing engine , Is it easier to make the piston first and the bore the cylinder or bore first and make piston to fit .What do other's do ?
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11 February 2020 at 08:35 #10070
Philip Burley
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@philipburley44197
11 February 2020 at 08:40 #451667
not done it yet
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@notdoneityet
Which is easier to remake, if they don’t match? Which is easier to reduce/increase by a the odd 0.01mm (or less)?

I would bore first and fit the piston. Others may think differently.

Edited By not done it yet on 11/02/2020 08:41:41
11 February 2020 at 08:42 #451668
David Noble
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@davidnoble71990
I was always told by an old guy, and now that I'm old too it must be very old advice, that Adam came before Eve!

David
11 February 2020 at 08:44 #451670
Mick B1
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@mickb1
Posted by not done it yet on 11/02/2020 08:40:55:

Which is easier to remake, if they don’t match? Which is easier to reduce/increase by a the odd 0.01mm (or less)?

I would bore first and fit the piston. Others may think differently.

Edited By not done it yet on 11/02/2020 08:41:41

+1. Not made this type of engine, but bore first is what I've always done for those I have, for the same reasons.
11 February 2020 at 08:53 #451675
Martin Kyte
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@martinkyte99762
. . . . or which do prefer to scrap the piston or the cylinder. Not that any of us get it wrong :O)

regards Martin
11 February 2020 at 08:54 #451676
Ramon Wilson
Participant
@ramonwilson3
Hi Philip, establish the bore first and acheive the final finish before making the piston/rings to suit.

That way it does not matter if your cylinder is slightly over or undersize, a piston is always much easier to finish to suit a bore than the reverse

Hope that helps some – Tug
11 February 2020 at 09:36 #451689
JohnF
Participant
@johnf59703
Hi Philip, standard engineering practice is bore the cylinder, bush, bearing first then make the mating part to fit, far easier to turn or grind to a size and remove small amounts of material from a shaft than a bore.

John

Edited By JasonB on 11/02/2020 12:54:06
11 February 2020 at 10:16 #451691
Lainchy
Participant
@lainchy
Hi Philip, I'd be very interested in your build of this… Is it their hit and miss? Are you going to do a photo album for it?

Regards and good luck

Ian

Edited By JasonB on 11/02/2020 12:54:25
11 February 2020 at 12:38 #451713
Martin Connelly
Participant
@martinconnelly55370
Models of the Red Wing I have seen build logs for have piston rings. Is this the case with yours? It may make the order of cylinder bore and piston diameter less important.

Martin C
11 February 2020 at 12:43 #451715
Philip Burley
Participant
@philipburley44197
So I will make a piston sized plug and bore the cylinder , the make the piston to fit , Rings are supplied with the kit so piston size is critical.

regards Phil
11 February 2020 at 13:07 #451721
JasonB
Moderator
@jasonb
I always do the cylinder first and then the piston but do the opposite when it comes to the crankshaft and all that fit around it as the crankshaft is the harder to make so bearings, flywheel and pulley are all done after.
11 February 2020 at 13:42 #451727
Martin Kyte
Participant
@martinkyte99762
Posted by JasonB on 11/02/2020 13:07:06:

I always do the cylinder first and then the piston but do the opposite when it comes to the crankshaft and all that fit around it as the crankshaft is the harder to make so bearings, flywheel and pulley are all done after.

That fits with the philosophy of protecting the investment you have already made either in money or time. Retain as many second chances on high value components as you can.

regards Martin
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