Marks Holt 75

reichpaul630 · Dec 10, 2020

i found that the condition & cleanliness of a computer fan determines the reliability/lifetime, esp. with laptops.
disassembled and thoroughly cleaned the fan of a flaky HP laptop a year ago (with jeweler tools!). never had another
problem. ran faster too!

FWIW, the increasing use of "solid state" drives tends to remove a major impediment to reliability.

Richard Hed · Dec 10, 2020

reichpaul630 said:
i found that the condition & cleanliness of a computer fan determines the reliability/lifetime, esp. with laptops.
disassembled and thoroughly cleaned the fan of a flaky HP laptop a year ago (with jeweler tools!). never had another
problem. ran faster too!

FWIW, the increasing use of "solid state" drives tends to remove a major impediment to reliability.

The new one is solitd state, only prob is that it is too small of a drive

dnalot · Dec 10, 2020

Proof of life. Still needs to be broken in and I will need a camera man on my next shoot. I love it when the flywheel dosen't wobble.

Thanks for watching

Mark T

Rockingdodge · Dec 10, 2020

Richard Hed said:
I was thimking of doing something like that if necessary but not to open up th e new one, maybe attach a cable.

Won't be a problem opening up the new one, they normally have a small cover similar size to the drive just so that you can add a second drive, doesn't void the warranty.

Richard Hed · Dec 10, 2020

Rockingdodge said:
Won't be a problem opening up the new one, they normally have a small cover similar size to the drive just so that you can add a second drive, doesn't void the warranty.

Really?! That's goo news.

CFLBob · Dec 10, 2020

dnalot said:
Proof of life. Still needs to be broken in and I will need a camera man on my next shoot. I love it when the flywheel dosen't wobble.

Thanks for watching

Mark T

Tells me the video is private and I can't watch. Am I the only one?

dnalot · Dec 10, 2020

Deleted to prevent confusion

Richard Hed · Dec 10, 2020

dnalot said:
I can see it but then I posted it to youtube. I clicked on the link in your post and it works as well.

I went back and checked the box saying it was safe for kids. Does it work now?

Mark T

doesn't work

Ghosty · Dec 10, 2020

Mark, it still come up as private, when you loaded it up to YouTube it must have been loaded up as private, not public.
Cheers
Andrew

dnalot · Dec 10, 2020

Ghosty said:
Mark, it still come up as private, when you loaded it up to YouTube it must have been loaded up as private, not public.
Cheers
Andrew

I looks like I saved the upload as a draft. Have now published it. Does it now work. Life was once so simple.

Mark T

Ghosty · Dec 10, 2020

Yep, video works, it runs well for a new engine, great work.
Cheers
Andrew

johwen · Dec 11, 2020

Excellent work and something to be proud of Richard. Johwen

gbritnell · Dec 11, 2020

Hi Mark,
My engine has probably at least 100 hours of running time on it. The compression is great. When I got the engine tuned to its best running settings it would puff a little smoke upon acceleration. I tried several different venturi sizes but had the same results. Mine will idle all day long with no smoke but when I rev it up it will puff for a few seconds then clean out. My best guess is that with the updraft style manifold it is puddling gas in the horizontal part of the runner and when revved up it pulls that wet fuel and creates the smoke. While running it uses very little oil so that's all I can figure it is. The engine isn't very sensitive to timing except when running slow. While idling I can retard the timing and it will bring the idle down even further but then it won't rev cleanly.
Your engine looks and sounds great. Tinker with the timing and carb settings for best results.
gbritnell

CFLBob · Dec 11, 2020

The video works for me now. Looks great!

reichpaul630 · Dec 11, 2020

truly a work of art. thanks for posting the vid!

paulr

Robert Ritchie · Dec 12, 2020

All those hours work really paid off, your project is very very nice and complete. I enjoyed listening to to your motor in action. I cant imagine how you must feel, the skills it took to complete your motor are rare. I await your next project from start to finish your talent continues.

Congradulations!
Mark

dnalot · Dec 13, 2020

Thanks for the comments guys. I have been sitting at my desk with my feet up taking it easy before starting another project, whiling away the time playing Kerbal Space. If you aren't a Kerbalnaut your really missing out. I have ordered a chunk of cast iron for the block of the Bernay engine so I am now committed to my next project.

Happy Holidays

Mark T

Robert Ritchie · Dec 14, 2020

Beam me up Scotty! Cant wait tell your next build start!

Robert Ritchie · Mar 9, 2021

Wow, you've been busy, nice work Mark. Get your chores done and get it done I can't wait to see the finished project!

fourstroke · Aug 27, 2022

dnalot said:
Hi

Well I had a great summer despite being in lock-down. Got out of the shop and out into the sun for a few weeks. Its Fall now and its wet out so I got myself back into the shop to work on the Holt project. This update shows the governor and the linkages connecting it to the carburetor.

Next is balancing the flywheels and making a starter clutch.

Mark T

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Hi
I've been reading your thread as I'm in the process of building one of these engines
My question is, is there a spring that fits inside the governor housing to work against the action of the flyballs?
Thanks
Dougie

Marks Holt 75

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