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Economy Hit & Miss Engine Build.

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Benny Avelin27/04/2017 20:59:06
80 forum posts
86 photos

It's looking great! I wish I had you painting skills/patience.

Nick_G28/04/2017 12:20:15
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1808 forum posts
744 photos
Posted by Benny Avelin on 27/04/2017 20:59:06:

It's looking great! I wish I had you painting skills/patience.

.

Hi Benny and thanks for the kind remarks.

Truth is though I do not really have any painting skills.! It's the result of nothing more than 'rattle cans' and masking tape for the pin stripes. Get close and it is a bit 'orange peely' on the finish. I probably would have got a better finish if I had got the air brush out.

I did however spend considerable time in the prep stages, but that is no secret be one painting a house, a car or a model etc.

I know nothing I ever make will ever win any competitions but I have in my limited time in the ME world seen lots of beautifully crafted and engineered items that have the visual edge taken off them by a whack it on paint job.

As I said it's all in the prep. - A Dremel, JB weld, Milliput, car body filler, primer and wet & dry are my new best friends. wink

Nick

Edited By Nick_G on 28/04/2017 12:31:35

geoff walker 128/04/2017 19:20:54
477 forum posts
181 photos

Having seen this project first hand I can certainly vouch for the excellent finish and overall build quality.

I would expect nothing less from a fellow Warringtonian

.....and it had pride of place on the dining room table!!!

geoff

Nick_G29/04/2017 16:03:14
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1808 forum posts
744 photos

.

Some self explanatory progress photos.

Have a good weekend folks.

Nick

Benny Avelin29/04/2017 21:36:46
80 forum posts
86 photos

With a fear of sounding repetitive, it looks amazing! You can certainly be proud of this, no need to be so humble.

Neil Wyatt29/04/2017 21:46:41
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18895 forum posts
734 photos
80 articles

I'm sure that would be in with a good chance of an award finished to that standard!

Neil

Nick_G07/05/2017 21:36:15
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1808 forum posts
744 photos

.

Did some work on the timing plate and made the push rod and contact block etc. Still need to remove tool marks and the end of the push rod where it meets the rocker is not final.

And a little video overview.

.
Nick
Nick_G21/05/2017 17:39:13
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1808 forum posts
744 photos

.

Been a while since last post as I have been making the fiddly bits to get the engine running.

Finally got it far enough that I could try a test fun as I wanted to know the basic engine was sound. I had managed to get a 2nd hand .60 sized R/C carb off ebay to use as a temp one for testing.

Few issues. Firstly was the compression. When I fitted the cylinder head I realised there was not a whole lot of compression. I really should have addressed that issue then before I went any further. So I had to take the head off and re-lap the valves. ........ I then had loads of 'ploppy-floppy' compression. smiley

Next I could not get the buzz coil working properly to give a strong and reliable spark. Being the impatient sort I dumped that and hogged a temp normal ignition circuit up. (I will address the buzz coil later)

The carb I have is a bit large and once I started to get the thing kicking back at me from hand spinning the flywheels I had a fair idea that it was just a matter of the carb and ignition timing settings to hopefully get the basic engine tested.

As yet I don't have the hit and miss governor fitted as that is one more thing to have an issue with for testing. I again will sort that out later. But for now it's running as a 'normal' !!!! 4 stoke.

Anyways, please forgive the shakey video as I just grabbed the camera and TBH was half expecting to have to stop it jumping off the bench.

Nick
JasonB21/05/2017 17:49:53
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22011 forum posts
2539 photos
1 articles

Sweeeet, ain't much wrong with that. As you say now that you know it is a runner you can add on the other bits a piece at a time without the problem of 99 possible combinations of what may be stopping it from running.

J

PS You need to find a decent electrician to sort out your buzz boxwink 2

Neil Wyatt21/05/2017 19:28:49
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18895 forum posts
734 photos
80 articles

Triple congratulations:

  1. A nice job.
  2. Getting it to run sweetly.
  3. Keeping your vid to a sensible length!

Neil

Martin Cottrell21/05/2017 21:22:11
297 forum posts
18 photos

Superb Nick! Sounds and looks fabulous, just needs a nice trolley to sit it on! smiley

Martin.

Nick_G22/05/2017 10:55:17
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1808 forum posts
744 photos

.

Thanks for the remarks guy's smiley

I now know I have a working foundation to build on and adjust.

Nick

Benny Avelin22/05/2017 15:25:49
80 forum posts
86 photos

Sweet indeed! Lovely sound on that engine.

Colin Heseltine25/10/2019 21:26:34
634 forum posts
220 photos

Nick,

Very nice job on this model engine. I have just bough the castings from Engineers Emporium and the small parts kit. I note that the cam is just the 6 mm thick and does not have the extra 6 mm to turn down to press into the bore of the gear. How did you do this as its was not entirely clear(to me) by looking at the photographs.

Thanks,

Colin

JasonB26/10/2019 06:59:11
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22011 forum posts
2539 photos
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Nick won't be able to answer.

Colin Heseltine26/10/2019 08:37:44
634 forum posts
220 photos

Thanks, Jason

JasonB26/10/2019 09:20:09
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22011 forum posts
2539 photos
1 articles

Colin, it looks like Nick may have bored the cam out to 20mm and then pressed that and the gear onto a 20mm steel bush and then pressed in the bronze one, you could probably do the same or press them both onto a 20mm OD x 10mm ID bronze bush. The cam is not heavily loaded so Loctite would also work in place of or in addition to a press fit.

Colin Heseltine26/10/2019 09:27:58
634 forum posts
220 photos

Jason,

Thanks for that. I had a feeling that was what he had done but wanted to confirm.

At present I am reading through the plans book deciding where to start. I need to finish the Excel die filer arms I have just had cast first.

Colin

Andrew Johnston26/10/2019 10:40:31
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6405 forum posts
682 photos

I made my cam from a solid piece of gauge plate. But I bought my Economy kit many years ago and didn't get much in the way of materials other than the castings. I did get a flame cut conrod (eventually) but binned it as it was too thin. I also binned a number of the castings, especially the smaller light alloy ones.

There are, or where, a number of errors in the drawings. One blooper is the requirement for 1/2" BSP threads for the exhaust and carb fittings. The designer obviously assumed that 1/2" BSP was 1/2" OD. I used M12 instead.

Andrew

JasonB26/10/2019 11:11:05
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22011 forum posts
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Shown as 1/4" BSP nowsmiley

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