WT2527 15cc Glow Engine

[EmgeeParticipant @emgee]

Nice looking engine and good finishing.

Emgee

[Craig Booth 1Participant @craigbooth1]

well, its been a while, but I've been slowly finishing things off and fixing some earlier problems.

Firstly, my beginners error on the valves. When machining I drilled a pilot hole for the live centre, not thinking that it weaken the top of the valve where the rocker makes contact. So have made new set of valves.

Second error, trying to cut teeth for the main timing gear on the rotary table on mill without a tailstock. Tailstock now bought and new timing gear made.

Third item, tried to aluminium weld the silencer pipe. Made a mess on the thin wall so have redesigned it with a threaded connection.

[Craig Booth 1Participant @craigbooth1]

Final role call before assembly…

[Michael GilliganParticipant @michaelgilligan61133]

Looks lovely, Craig

MichaelG.

[Jeff DaymanParticipant @jeffdayman43397]

Looking great Craig! All present and correct I'd say.

Not long before noise and smoke I think!

[Craig Booth 1Participant @craigbooth1]

thanks guys, not too much smoke hopefully

assembled her this afternoon and first wee problem. Was running it using the cordless drill and the circlip holding the valve spring slipped off. Valve slipped down into the cylinder and bent. Fortunately no other damage. Will need to make another valve and try to get a good fit on the seat again.

[Craig Booth 1Participant @craigbooth1]

It's alive!!!! It works

Very very happy after the first runs today. Started super easy, idles well, and has good throttle response.

Only put 1.5 tanks through it and didn't want to pusjh it hard, so looking forward to getting it run and tuned in.

I don't have a tacho so not sure what the RPMs where but certainly souned like a good range.

Linky to videos here:

First Runs

First Runs

And heres the plane shes going in. Can't wait to get it finished now.

[Former MemberParticipant @formermember32069]

[This posting has been removed]

[AdrianRParticipant @adrianr18614]

I am totally amassed, this is your first project, the quality is fantastic. What will be your next one? a 9 cylinder gnome replica?

[Craig Booth 1Participant @craigbooth1]

Thanks guys. Adrian, no not a 9 cylinder, I have plans afoot for the design of a 80cc V Twin 4 stroke, currently drawing it up in Autodesk Inventor.

So I put 2 tanks of fuel through the engine over the weekend and borrowed a tacho. As I said, the idle is great, down at 1500rpm and smooth, but am a bit disappointed in only revving to around 3500rpm which I thought was a bit low.

I've stripped her down to inspect everything and check for anything rubbing, wearing, or loose. Everything seems ok, but I did discover that the timing gears were one tooth out, i.e. 15 degrees retarded from where it should be. What I'm hoping is that advancing will give it more power/higher rev's but not sure. Looking forward to trying it again to see the difference.

 

 

Edited By Craig Booth 1 on 25/03/2019 21:22:02

[Jeff DaymanParticipant @jeffdayman43397]

Congratulations on the first runs.Well done Craig! Good luck on next ones after timing adjust.

[David George 1Participant @davidgeorge1]

Hi Craig nice to see a finished motor running nice piece of work.

David

[Craig Booth 1Participant @craigbooth1]

Hi all,

Small update. Ran the engine again with the timing gears in correct location. Definitely an improvement at the top end rpm, up to around 5500rpm.

Interestingly the bottom end is now not so smooth as it was before, but not too bad.

My next plan to improve the rpm is to try making another set of valve springs that are a bit stiffer as I suspect the bounce back on the valves could be limiting.

Cheers

Craig

[Former MemberParticipant @formermember32069]

[This posting has been removed]

[Craig Booth 1Participant @craigbooth1]

Posted by Barrie Lever on 29/03/2019 13:22:49:

Craig

I was very impressed with the tick over, shame you have lost some of that for top end performance.

What prop size are you running?

Regards

Barrie

Hopefully when it runs in properly I might be able to get the bottom end tuned in again.

Currently using a 14×8, but plan to try a 13×6 and 13×8 this weekend.

Will keep you posted.

Craig

[Steve WithnellParticipant @stevewithnell34426]

Lovely job Craig. Thanks for sharing the photo's, there is a lot of effort required to keep on top of the photo's whilst trying to produce a quality set of parts, which can be tough enough!

Regards

Steve

[Craig Booth 1Participant @craigbooth1]

Hi all, a bit of an update.

So I had decided to try making a new piston with 2 rings rather than 1 as the plans have. There was not enough room to fit 2 on the original due to the cut out used to fix to the gudgeon pin with c-clips plus the diameter of the gudgeon pin. I used Autodesk Inventor to design a new one, Obviously had to keep the distance from the centre line of the gudgeon pin to the top of piston the same to retain the same compression ratio, so reduced the gudgeon pin diameter and also did away with the c-clip fastening, instead using bronze plugs at each end of the pin to keep centre.

I had a few problems cutting perfectly perpendicular ring slots in the piston, but eventually suceeded (thanks to all suggestions from my post for help on the other page).

Happy to report after a few tanks of fuel through it today, and a bit of fiddling with carb settings I have managed to get it running fairly smooth and reliable. The range is now 2600-7600rpm, with the top end getting a bit higher with each run.

Very happy and starting to think that I will actually be able to put it in the plane that I've built especially for it.

A short video of one of the engine runs below:

[Roderick JenkinsParticipant @roderickjenkins93242]

Excellent, very nicely done.

Rod

[Ian Skeldon 2Participant @ianskeldon2]

Great work Craig, sounds lovely, hope you get many happy hours flying it.

[Craig Booth 1Participant @craigbooth1]

thanks guys. The engine is now running solidly up to 8000rpm on a 14×8 prop and has had another 6 or so tanks of fuel through it. Reckon she is ready to spread her wings this weekend weather permitting.

A double maiden of the plane and the engine.

[V8EngParticipant @v8eng]

Hope it flies well and many happy flying hours to follow.

[Jeff DaymanParticipant @jeffdayman43397]

Great engine and plane Craig! Happy flights (and happier landings)

[Craig Booth 1Participant @craigbooth1]

Hi all,

Just to wrap this thread up, below is a link to successful maiden of the Spacewalker with the WT2527 engine. Just gave it a short flight and landed (sucessfully) so I could check everything. Happy with results. Hope to get her out again soon.

[EmgeeParticipant @emgee]

Hi Craig, well done, sounds great.

Emgee

[David George 1Participant @davidgeorge1]

Thanks for the work you have put in its nice to see the end product in flight. It must be very satisfying. You don't always see the end of a build.

David

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