Hoglet Build

[Nick_GParticipant @nick_g]

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Time for another engine build. This will be my 3rd project and have decided to try my hand at an IC engine.

With the assistance of another member I have chosen this the be a Hoglet V twin. This is very loosely based upon the Harley engine and has an open crank.

So these are the drawings

I will have a nosey at these for a couple of days and then proceed to start to butcher metal and increase the weight of my scarp bin.

No postman with a heavy box on this one as it's of bar and plate construction.

Nick

Edited By JasonB on 24/02/2016 20:25:14

[Nick_GParticipant @nick_g]

[JasonBModerator @jasonb]

Better hurry up and get my one finished before you beat me to it.

[Nick_GParticipant @nick_g]

Posted by JasonB on 24/02/2016 20:23:18:

Better hurry up and get my one finished before you beat me to it.

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I might scale mine up the X2 so mine will be bigger than yours.

Nick

[JasonBModerator @jasonb]

If you do that then make sure you don't end up with the flywheels in the scrap box that bronze is not cheap.

Talking of which I used hollow bronze as there is no point in paying for the bit in the middle.

Have you thought of ignition yet? S/S do a nice little twin coil setup for the Hoglet

Edited By JasonB on 24/02/2016 20:35:14

[Nick_GParticipant @nick_g]

Posted by JasonB on 24/02/2016 20:34:46:

Talking of which I used hollow bronze as there is no point in paying for the bit in the middle.

Edited By JasonB on 24/02/2016 20:35:14

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I was 'wondering' if that bronze flywheel outer could be substituted for cast iron.? It would be cheaper and would not be so Americano and blingy.

Nick

[JasonBModerator @jasonb]

Iron is about 25% lighter so you would need to up the size somewhere if you can find room to do it.

[Nick_GParticipant @nick_g]

Posted by JasonB on 24/02/2016 21:13:39:

Iron is about 25% lighter so you would need to up the size somewhere if you can find room to do it.

.

I have however got some large slugs of plutonium in a box under my bed. ………….. Will they do.?

Nick

[Jeff DaymanParticipant @jeffdayman43397]

Reminds me of a man I used to work with. He had worked for years in Xray machines of various kinds. Under his desk he had a souvenir – a rotating target assembly that had stalled and "melted down" where the beam had shone on it for a while when it stalled. It was a neat artifact that was passed around to all us young keeners to gaze upon.

A few years later the firm was doing environmental checks around the building due to concerns about a) mercury b) radon gas. When the guy with the radiation detector / geiger counter came round, alarms bells and whistles when off in the meter like you wouldn't believe. They isolated the source as the gent's Xray target – about 1000 times normal background radiation in the building! Needless to say some folks got nervous and the building was evac'd for the day.

My colleague was very disappointed as men in yellow suits took the offending item away in a lead box with a police escort.

Couldn't have been that bad for humans as he fathered several kids all with 2 eyes and 10 fingers and no third arms, as did many others that worked nearby, and no rash of cancer incidence among the office group 30 years on (knock wood).

They also hauled several hundred pounds of mercury out of the floor concrete and drains…..glass bodied mercury switches were made there from 1940's until early 1980's…. and the machines leaked a little.

Anyway back to flywheels – if you need a heavy slug and don't want to dip into your Pu stash, tungsten rods as used for TIG welding can be cut up and loaded in a hole like lead shot. Or use lead shot, for that matter. Some railways used it to fine tune balance on driving wheels. JD

[Ian S CParticipant @iansc]

How about a groove in the side of the rim, and fill it with lead. With the FW weighted this way the cast iron would take the centrifugal load, and retain the lead.

Ian S C

[JasonBModerator @jasonb]

If you went with Ian's option you could just get back to the bronze weight by cutting a 1/4" wide 0.400" deep slot in from one side and filling with lead, but mind how you go about getting the lead we know your history about safety on roofs

Will you also be making the frame etc to go with the engine?

[John Stevenson 1Participant @johnstevenson1]

Please put it in closed crankcases instead of the tardy American design of spitting oil all over the place.

If they wanted to create an 'open' design they should have used guttering for the 'open' cylinder design

[JasonBModerator @jasonb]

Don't give him Ideas he can't afford John think of the lump of HE 30 he would need for that

[Neil WyattModerator @neilwyatt]

Posted by Nick_G on 24/02/2016 21:28:20:

I have however got some large slugs of plutonium in a box under my bed. ………….. Will they do.?

Repo Man

Neil

[Nick_GParticipant @nick_g]

Posted by Ian S C on 25/02/2016 09:31:16:

How about a groove in the side of the rim, and fill it with lead. With the FW weighted this way the cast iron would take the centrifugal load, and retain the lead.

Ian S C

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This idea is a possibility.

Nick

[Nick_GParticipant @nick_g]

Posted by JasonB on 25/02/2016 10:32:30:

Will you also be making the frame etc to go with the engine?

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I saw this thread about the bike that this guy was making for his son that was powered by a Hoglet. – Problem is though that my son is 22 and 6'4"

Also Harleys are often linked with the 'gay scene' When I started to ride a bike I had to promise said son that I would not buy a Harley and ride round with new found chums dressed in leather.

Nick

[Nick_GParticipant @nick_g]

Posted by John Stevenson on 25/02/2016 10:46:01:

Please put it in closed crankcases instead of the tardy American design of spitting oil all over the place.

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It's a Harley look a like engine. Spewing oil everywhere is what their 'real' big brothers do anyway.

Nick

[davebParticipant @daveb17630]

I never had a drop of oil leak from my HD, when I saw some oil under it I knew there was a big problem, turned out the oil tank had sprung a leak. Nice AA people popped it on the back of a car transporter and brought it, myself and wife back from the Welsh border to Essex.

It's the old British bikes that spewed oil everywhere.

Keep us updated Nick, I'm almost retired enough to have a go. There are a fair number of V twins to model but you might as well go all the way and build a rotary or radial engine.

Dave

[Ian S CParticipant @iansc]

If you don't want a Harley, how about a Buell, nephew's got one, swore he'd never ride an HD, but this is something else, double the HP for a start, HD engine well worked over.

Ian S C

[Nick_GParticipant @nick_g]

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I had some 1/4" plate delivered so into attack mode.

I made the crankcase halves as a pair and tacked together with super glue so that I could be sure they matched and separated later. This of course means that if you drop a clanger you butcher twice as much metal for the bin. – This was my second try.! Fortunately I had ordered more metal than I needed.

The crankcase tops were also made as a pair.

I aided the superglue bond with threads to make sure they did not separate in the lathe 4 jaw while I bored out the hole that the cylinder liner will sit into.

Golly.!!!! …… They all fit.

The studs are just temp until the cap head screws arrive. Having said that I think I prefer the look of studs (if they are all the correct length) and nuts over cap head screws. – Opinions please.?

All seems true with it on the surface table. I was also surprised how rigid it was when fixed together. However I think that sooner rather than later I will make a temp base to support the bottom and stop it getting twisted during construction stages. …………. Me being ham fisted un-all.

Nick

[JasonBModerator @jasonb]

Off to a good start Nick even if you did take the easy route and not do the angle cut on the crankcase tops but I won't tell anyone

I have used M4 button heads on mine, Assume you have converted to metric fixings too?

Are you going to use the oilite bushes suggested on the drawings or just turn your own from bronze?

J

[Nick_GParticipant @nick_g]

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Morning Jason.

Yes I did take the easy route with those tops. I figured that it's the sort of thing that has to match spot on or not at all.! ………. I did not have enough faith for myself to pull off the former. So I cheated and did them like lots of others have..

The threads will be some metric but mostly BA ones.

I figured that I would turn my own bushes from bronze unless there is a good reason not to.?

Nick

[JasonBModerator @jasonb]

I turned my own too. For the amount of running its likely to get the extra oil holding ability of the oilite won't matter.

If you are going to use cap heads then make sure you can get them in BA sizes before you start tapping as ones like 5BA are hard to find

[Nick_GParticipant @nick_g]

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Where can I obtain some dural aluminium for the con rods. Providing that is the right stuff of course as the drawing is marked in Americano.

Done a web search with little joy. So I am either stupid or it's correct name is something else.

Cheers, Nick

[Michael GilliganParticipant @michaelgilligan61133]

Nick,

Talk to these guys, at Cadishead

**LINK**

MichaelG.

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P.S. … Dural = Duralumin = a range of high spec alloys dating back to WWII

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