Author Topic: Unusual Porting  (Read 2992 times)

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Offline HolmenTree

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Re: Unusual Porting
« Reply #10 on: February 11, 2012, 04:06:53 pm »
The kart reed valve manifold and carb I bought from Russell Karting out of Kansas City, I don't even know if their still in business.

Yep their still in business ,I just googled them www.russellkarting.com 
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Offline Al Smith

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Re: Unusual Porting
« Reply #11 on: February 14, 2012, 08:39:56 pm »
I gotta kind of laugh about some of those old karters of which I know personally two nationally ranked ones .Even to this day they'll tell you part of the secret but they'll never spill the beans on the whole thing .

That aside one of them who I went through apprenticeship school with is trying to locate me a 101B Mac .He said he'd port it .Ha must not trust me . ;D

Offline HolmenTree

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Re: Unusual Porting
« Reply #12 on: February 15, 2012, 08:37:43 am »
I gotta kind of laugh about some of those old karters of which I know personally two nationally ranked ones .Even to this day they'll tell you part of the secret but they'll never spill the beans on the whole thing .

That aside one of them who I went through apprenticeship school with is trying to locate me a 101B Mac .He said he'd port it .Ha must not trust me . ;D
I know of 3 Mac 101 hotsaws with pipes here in northern Manitoba complete with 34 mm carb setups. All with blown bottom ends , casualities from fierce competitions of the 1980s. They were Bob Walker saws from Vancouver Island, B.C.
Bob built some very fast Macs at the time, but I do question his skill of welding due to a couple of those Macs losing their crankshaft balance weights.

Maybe next year I may start up a modified saw class at our local festival and get these guys interested in reviving those old Macs, but time is an essence though seeing they are in their mid 60s now. All 3 of them do have sons who may take up the cause.

Yes not any sane competitor or builder will give away all his tricks.......... just sometimes they may forget more then what they now know. ;D
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Offline Al Smith

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Re: Unusual Porting
« Reply #13 on: February 16, 2012, 07:36:44 am »
It's a nostalga thing or at  least it is for me .Mac kart engines or 090s' for that matter are first nearing impossible to find parts for .

For all intents most likely the hottest set up now of days is a bored and stroked 3120 Husqvarna . Then it gets down to dumping in excess of 3 grand in one or more . Kind of costly for a less than 4 second run .

Most of those 2 cycle deep dark top secret things have been around for decades .Nothing  in my opinion  is really new just retried or relearned as is often the case .If nothing else though it keeps the wheels of the mind turning  eternally or so it seems at times .  ;)

Offline ch74

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Re: Unusual Porting
« Reply #14 on: September 29, 2015, 11:41:03 pm »
Would a reed valve rc eng work for a chainsaw . I had this thought about a year ago, I wanted to find a poulan or cheap saw and mod it to fit a rc eng. Has anyone ever tried it?
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Offline ch74

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Re: Unusual Porting
« Reply #15 on: September 29, 2015, 11:47:25 pm »
Also, maybe a rc pipe on a chainsaw. Just a thought... ;D
C.H. Trees
Milton, Fl

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

General Aviation Services. (G.A.S.) A&P Mechanic.
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Offline 660magnum

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Re: Unusual Porting
« Reply #16 on: September 30, 2015, 12:09:11 am »
I have a big single chamber tuned pipe on a Husqvarna 372. It made a considerable difference in power. But I don't consider it practical for use in the woods.

The chainsaw is typically used WOT wide open throttle so the single chamber pipe like is used on a RC racing boat engine works best for the chainsaw.

The pipes used in RC pattern work have two expansion chambers. They are tailored for stability of the engine run as well as make more power. Then there are the tuned cans used by the 3D guys.

Most of the early chainsaws had reed valves and many of these were converted for use on RC model airplanes.
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Offline ch74

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Re: Unusual Porting
« Reply #17 on: September 30, 2015, 06:21:10 pm »
Thanks for the reply. I was thinking a model airplane. Like the mor round ones that wouldn't get in the way. Would that work. Anything has to better then a metal box. Huh?  ;D
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 #18 on: September 30, 2015, 06:31:53 pm »
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 #19 on: September 30, 2015, 06:38:43 pm »
There's been most anything used at one time or another.

Remember the weight and aerodynamic drag factors and you should be OK.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

 

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