Middleton Inverted V engine

[HowiParticipant @howi]

Nice to see another Middleton engine, I still class myself as a beginner so it is an ideal engine to have a go at. The last one I built was the Middleton V4, a nice lump of an engine.

Don't know if anyone has spotted the deliberate mistake yet!!!

Page 286 Engine Frames (Fig 6)

"I started with four pieces of 5 X 41/4 inches 3/8 inch thick aluminium plate"

Oh! No! you didn't

page 288 shows them to be 5 X 41/2 inches

Guess what I cut mine to!!!

What a numpty!

[HowiParticipant @howi]

[Eric CoxParticipant @ericcox50497]

There's an old adage, "read twice, cut once"

[JasonBModerator @jasonb]

Howi there is a slight revision to those frame drawings should be in the next issue 4569 but if you are eager to get on let me know and I'll upload the revised drawing. If you ask really nicely I can do a special to suit your small bits of ali.

Since I spotted that I have cast an eye over the rest and made a few more corrections for Diane so rest should be OK though I have not read the text.

[HowiParticipant @howi]

Hi JasonB

That would be much appreciated, I have not been in the workshop for a few months, due to lots of jobs around the house. I thought this would be the ideal project to get my interest stimulated again.

It is a nice looking engine and all bar stock apart from the flywheel, although I have fabricated flywheels, you can't beat a bit of cast iron.

I have cut and squared up 4 pieces of aluminium to my wrong dimensions (ho hum!) and only noticed my mistake when I started to mark up the first piece. Thought I was going bonkers, it was getting late so thought, put it down and draw it up on graph paper and try and see what I was doing wrong – that's when i noticed my boo boo.

I can probably attach a 1/4 inch piece at the short end somehow on all 4 pieces then mark out again.

That will teach me to go racing ahead without my thinking cap on.

[JasonBModerator @jasonb]

The main issue with the frame drawing was that the hole for the valve rocker arm was in the wrong place and the 7/8" height of the lower corner was wrong. I have only shown the wrong items, rest is as per the mag

Revised drawing

Howi I think you will mave to see if you can add a bit on or move the cylinder mounting hole along a bit as it comes right on the edge, 1/8" further up should do it. but this shows the revised height of the end for a 4.25" frame

Howi's drawing

Edited By JasonB on 02/09/2017 12:47:37

[HowiParticipant @howi]

That's super, thanks Jason, will have a peruse and see which is the best way to go.

many thanks once again

Howi

[JasonBModerator @jasonb]

Another option would be to increase the central gap to 1" as below, or you could go 3/4" which would give you a bit more where the cylinder mounts.

[HowiParticipant @howi]

Thanks Jason, that's an option worth consideration.

Many thanks once again

Howi

[HowiParticipant @howi]

Have gone with shaving 1/8inch off either side as the best compromise.

Just got to sneek into the workshop now.

[JasonBModerator @jasonb]

Sneak this in with you, it's got the 1/8" off either side

Edited By JasonB on 03/09/2017 13:32:32

[HowiParticipant @howi]

Amazing, thank you – I owe you big time for this

[Michael Scott 2Participant @michaelscott2]

Hi every one

I have been cutting metal for the Middleton V Twin for more years than i want to own up to and have just reached the stage where I would like to make the eccentric sheave and discover that I do not have the drawing for it

Can any-one help me out please?

Michael

[JasonBModerator @jasonb]

Here you go

[Michael Scott 2Participant @michaelscott2]

Many thanks for a very rapid response

I cannot see or print the whole page

Michael

[JasonBModerator @jasonb]

this is the hole of fig10, click and it should come up larger

[Michael Scott 2Participant @michaelscott2]

Many , many thanks.

I always meet such nice people on technical Forums

Michaael

[Author]

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