Author Topic: Len Mason's "Mastiff" - chewed from the solid  (Read 34530 times)

Offline Ye-Ole Steam Dude

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #240 on: November 19, 2018, 12:44:36 PM »
Hello David,

Great job on this new video, watched it on youtube (full screen) looks and sounds wonderful.  :ThumbsUp:

Have a great day,
Thomas

Offline PJPickard

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #241 on: November 19, 2018, 03:50:09 PM »
Nice job on this I followed along every step. Its on my bucket list of engines!

Offline steam guy willy

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #242 on: November 19, 2018, 04:02:17 PM »
Hi Len , Lovely engine there and the trouble with adjusting devices is that they always need continual adjustments   ;D :cartwheel: !!

Willy

Offline zeeprogrammer

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #243 on: November 19, 2018, 04:29:56 PM »
Definitely worth seeing in full screen. Nice job!  :ThumbsUp:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline Admiral_dk

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #244 on: November 19, 2018, 10:31:52 PM »
Great result David  :praise2:

It sounds very nice for a non-loaded engine - you should be proud of the end result  :cheers:

Offline MJM460

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #245 on: November 19, 2018, 10:36:58 PM »
Hi David, a great result, one to be very proud of.

 MJM460

The more I learn, the more I find that I still have to learn!

Offline Art K

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #246 on: November 20, 2018, 12:38:08 AM »
Dave,
Mastiff sounds great. It'll get better as it runs longer, it's not even broke in yet. :DrinkPint:
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline Brian Rupnow

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #247 on: November 20, 2018, 01:10:51 AM »
David---A lovely and impressive piece of work. ---Brian

Offline Roger B

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #248 on: November 20, 2018, 09:57:22 AM »
That sounds much better  :praise2:  :praise2:  There are so many little details that have a big effect  ::)
Best regards

Roger

Offline michelko

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #249 on: December 10, 2018, 04:13:22 PM »
Very nice build  :cheers:
Can you say something About the compression Ratio? If i remember Right you had some Trouble get it running. Didi you do changes to the CR.

The Background is i can┤t get my Bugatti engine running reliable. i believe my cr (6:1) is a Little high for the homemade plugs so i am planning to reduce the cr.

Regards Michael

Offline gbritnell

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #250 on: December 10, 2018, 04:38:51 PM »
HI David,
I don't think the throttle range is being limited by the single carb and longish intake runners as much as it is with the vapor fuel supply. Granted as you open the throttle it will tend to pull more fuel vapor but balancing the air supply with the engine's needs is kind of an iffy thing. The vapor fuel supply setup works well for single cylinder engines or engines that run a a pretty constant rpm but I don't think they are very efficient for multi cylinder engines
My suggestion would be to make a proper fuel tank mounted with the top of the tank just below the needle valve height and play with the carb adjustments that way.
gbritnell
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Offline deltatango

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #251 on: December 10, 2018, 11:59:16 PM »
Hi Michael,
Thanks!

If you look back through the build log you will find a long list of the mistakes I had to correct before Mastiff would run well. These included leaking gaskets, over-size main jets, wrong timing and leaking home-made spark plugs. The compression ratio is about 3.8:1 and at first there wasn't much compression but this has developed as the engine has been run. With small cylinder volumes the thickness of the head gasket has quite an effect on the CR, could you try a thick gasket to reduce the CR?

David




Offline b.lindsey

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #252 on: December 11, 2018, 12:27:54 AM »
I am late to the party David, but congrats on a nice running and really beautiful engine. Glad you got all the little issues worked out.

Bill

Online steamer

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #253 on: December 11, 2018, 02:00:16 AM »
She's a runnah!!!

Congrats and thanks for taking us along!

Dave
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Offline Art K

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Re: Len Mason's "Mastiff" - chewed from the solid
« Reply #254 on: December 11, 2018, 03:31:42 AM »
David,
I have to admit that 3.8:1 sounds low. Are you sure you want to drop it more? My understanding of L head engines 6-7:1 was optimal, 7 probably max. Though I admit I have no idea how that applies to a miniature. Besides the fact that you probably built it as designed.  I never figured it out but I think my Upshur is about 4.5-5 to one. It will run 7000rpm. Val I actually used Alibre to figure the area and have 7:1 I think I'm rambling & will stop.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King