Author Topic: Bruce Macbeth Engine, European Version  (Read 58847 times)

Offline steamer

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Re: Bruce Macbeth Engine, European Version
« Reply #675 on: February 08, 2022, 11:46:56 AM »
That runs wonderfully!   I can only hope mine will run as well!!!

Congrats Achim!   She's a Runnah!!!!


Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #676 on: February 08, 2022, 12:31:59 PM »
That runs wonderfully!   I can only hope mine will run as well!!!

Congrats Achim!   She's a Runnah!!!!


Dave


Hi Dave, thanks.
You put so much effort in your design, so I am sure she will be a Runnah, too.
If you will take in account, what we have learned and discussed here about "Model Engine Timing", than you will get it managed too,surely.
Kind Regards
Achim

Online Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #677 on: February 08, 2022, 03:45:10 PM »
Excellent  :praise2: :praise2: Sounds great  :ThumbsUp: :wine1:
Best regards

Roger

Offline gbritnell

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Re: Bruce Macbeth Engine, European Version
« Reply #678 on: February 09, 2022, 12:27:30 PM »
Outstanding results!  There's so much satisfaction when you solve all the problems.
gbritnell
Talent unshared is talent wasted.

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #679 on: February 09, 2022, 02:12:58 PM »
George, Roger, thank you very much for always following along.


Today was a perfect day in the R&D department.
Overall run time in the records now 193 Minutes.
Jeff (rustcollector) has given another recommendation to decrease the exhaust duration by adjustment.
Roger has mentioned earlier already, that valve lash can get an influence to the duration too.
Exactly this was done now.
I have increased valve lash of the exhaust to 0,2 to 0,25 mm.
This does results in decreased duration from 260 to 245 crank shaft, exactly what should be archived.
The opening of the exhaust does start now with 50 before BDC and there is a very small remaining overlap.
See picture #1 below.
That is my final timing now.
The engine is running in my understanding very nice with this timing.
Lowest measured rev/min less than 500.
Some time ago Jeff (rustcollector) has mentioned also, that the Chinese 3 mm carb with a slightly modification by an 0-ring internaly, should feed this engine very well also.
So far my 4 mm DIY carb was best running nearly closed so that was another reason to try this 3 mm carb again.
In this video the final above mentioned timing and the 3 mm carb.
For me the result is absolutely perfect.
My CNC mill has made some new modified exhaust cams yesterday, but they are  collected by a ty-rap now and will find its place, together with the other remaining parts of this build, under the bench.
So finally thank you very much for all here giving the useful support during my journey and of course for watching this build quietly.
A very special thanks to Jeff (rustcollector), he has been always right with his suggestions
A Plexiglas cover is ordered and some space, very close to the Snow engine is prepared for the storage.

« Last Edit: February 09, 2022, 02:24:59 PM by fumopuc »
Kind Regards
Achim

Offline crueby

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Re: Bruce Macbeth Engine, European Version
« Reply #680 on: February 09, 2022, 02:43:54 PM »
Phenominal work!!  Looks and sounds terrific!

Offline wagnmkr

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Re: Bruce Macbeth Engine, European Version
« Reply #681 on: February 09, 2022, 02:54:41 PM »
Great perseverance. That does run and sound great! Congrats!
I was cut out to be rich ... but ... I was sown up all wrong!

Offline Dan Williams

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Re: Bruce Macbeth Engine, European Version
« Reply #682 on: February 09, 2022, 02:55:35 PM »
Outstanding Achim! Thanks for reporting on the R&D efforts. I will keep these in mind as I start working on some sort of vintage looking electrical generator plant as a good, useful load for my engine.

Dan
Dan