Author Topic: Unusual Porting  (Read 2992 times)

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Offline ch74

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Re: Unusual Porting
« Reply #20 on: September 30, 2015, 06:49:14 pm »
Thanks man.
C.H. Trees
Milton, Fl

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Offline 660magnum

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Re: Unusual Porting
« Reply #21 on: September 30, 2015, 08:48:44 pm »
I've had trouble trying to help you for the usual scenario is putting a chainsaw or weed whacker engine into a model air plane and I keep giving responses in that direction.

You are wanting to put a Chinese reed valve model airplane engine into a chainsaw.

Some good chainsaw candidates would be the so called "Clam shell" chainsaws with a plastic case and a independent metal engine. These are typically the smaller saws offered as home use chainsaws.  The are more often sold in discount stores and are often at garage sales and junk piles as they are often considered not economical to repair. These are usually 30 - 50 cc. Look at some of them and see what you think?

I see a big problem in pulling this off as chainsaws have double ended cranks and most reed valve model RC engines have cantilever cranks. The modern RC engines with more power have battery powered ignitions and no flywheel. How will you cool the engine? How will you start it?
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Offline ch74

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Re: Unusual Porting
« Reply #22 on: October 01, 2015, 12:03:42 am »
Low volt computer fan, for cooling when the engine is running it comes on I have also thought about doing it to a modern chainsaw engine. Trimming and balancing the flywheel and using a fan to cool only when eng is running the fan comes on. That would b some ponys in a chainsaw eng if just that was done. But as far as rc eng in chainsaw it would be a project that's for sure, but the ignition on rc put a batt pack somewhere and wire it to the kill switch , turn switch to on it energizes the ignition. It would b a runner.I think
Has anyone ever done the fan thing and removed all weight off it and drag installed a low volt high volume fan run that off ignition. If this sounds stupid let me know. Lol
C.H. Trees
Milton, Fl

Contact info; (985)707-4273.
Email; charlesholton74@yahoo.com

General Aviation Services. (G.A.S.) A&P Mechanic.
Milton Airport
Milton ,Fl

Offline 660magnum

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Re: Unusual Porting
« Reply #23 on: October 01, 2015, 01:03:01 am »
There's also the direction problem as the prop end of a RC engine turns counterclockwise and the PTO end of a chainsaw turns clockwise.

But that presents little problem for a battery ignition engine as you just re-position the timing sensor. The reed valve engine runs as well in one direction as the other.
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Offline ch74

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Re: Unusual Porting
« Reply #24 on: October 01, 2015, 01:42:47 am »
You thinking about it? ;D  I no it's off key, but what about removing all fins and necessary weight from a chainsaw eng flywheel? Installing a elec fan? Would the power gain b worth it? It would b like installing elec fans on a car and underdrive pulleys, getting rid of mechanical fan and stock pulleys. The way im looking at it is, the fan fins on a flywheel and extra wieght in the flywheel is a lot of drag git rid and lighten that flywheel up I bet u could get a couple hp out of it. What do you think, 660?
C.H. Trees
Milton, Fl

Contact info; (985)707-4273.
Email; charlesholton74@yahoo.com

General Aviation Services. (G.A.S.) A&P Mechanic.
Milton Airport
Milton ,Fl

Offline 660magnum

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Re: Unusual Porting
« Reply #25 on: October 01, 2015, 07:22:03 am »
For a cold start race saw making three cuts, no cooling is needed.
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That knowledge can live after us... and that "Pays It Forward".
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Offline ch74

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Re: Unusual Porting
« Reply #26 on: October 01, 2015, 10:00:13 am »
I was thinking for a work saw.
C.H. Trees
Milton, Fl

Contact info; (985)707-4273.
Email; charlesholton74@yahoo.com

General Aviation Services. (G.A.S.) A&P Mechanic.
Milton Airport
Milton ,Fl

Offline ch74

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Re: Unusual Porting
« Reply #27 on: October 02, 2015, 12:49:56 am »
Also another thought. Has anyone ever put a R/c supercharger on a saw. There small and compact??
C.H. Trees
Milton, Fl

Contact info; (985)707-4273.
Email; charlesholton74@yahoo.com

General Aviation Services. (G.A.S.) A&P Mechanic.
Milton Airport
Milton ,Fl

Offline 660magnum

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Re: Unusual Porting
« Reply #28 on: October 02, 2015, 07:28:05 am »
Have not seen any super chargers on chainsaws.

A tuned pipe changes them tremendously
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline ch74

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Re: Unusual Porting
« Reply #29 on: October 02, 2015, 08:27:12 am »
yes sir. But the tuned pipe would be a pita to work around if you wanted to use it out in the feild.
C.H. Trees
Milton, Fl

Contact info; (985)707-4273.
Email; charlesholton74@yahoo.com

General Aviation Services. (G.A.S.) A&P Mechanic.
Milton Airport
Milton ,Fl

 

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