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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Tachometer Readings >> Pieces is Parts
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Pieces is Parts - 2/22/2003 10:57:38 AM   
tkg


 

Posts: 2202
Joined: 1/6/2002
From: Riverton, WY, USA
Status: offline 		Way cool, so now we have kits for the 33,36,42 and 46. , , ,

(in reply to flipflop)
       Post #: 26

Poulan 42 - 2/22/2003 11:42:57 AM   
Volfy



Posts: 3227
Joined: 1/4/2002
From: Houston, TX, USA
Status: offline 		And more than likely the 34, 38 and 40 as well.

Any idea why Poulan makes so many different displacements that are virtually identical? Kinda makes it hard to decide which one to get.

Is it okay to let these Poulan spin up to 9000rpm? I know most run them in the 7000+rpms, but I might be restricted by the airplane to a smaller diameter prop.

_____________________________

Si vis pacem, para bellum.

(in reply to flipflop)
       Post #: 27

Rotated Carb Adapter... - 2/22/2003 12:31:56 PM   
CrazyHerb-RCU-delete



Posts: 391
Joined: 3/13/2002
From: CA
Status: offline 		Guys,
I've made a rotated carb adapter (based off the stock maifold) on the 42 out of some 1/2 inch poly cutting board. Think it will handle it? I'll be using thick fiber gaskets for heat insulation....Was really easy. Now I have the butterfly's vertical for straight-shot linkage.

Basically I bolt through (counter sunk) to the cylinder then used the stock carb rods counter sunk from the other side...just heated up the rods with a butane torch and pulled them into the poly.

Then, just a matter of making the pump/pressure port and routing out one side...then through.

I'm sure it would have been just as easy with some epoxyboard phenolic or any high-temp resistant plastic.

Anyone know where I can get some of that G-10 Epoxy board or whatever it's called. I can picture the stuff in my head...thinking electronics store? Do they make like 1/2in and 3/4 thick stuff?

Nice having the bolt-on carb.

The ignition is just icing on the cake....thanks CH!!

CrazyHerb

PS - Speaking of this little 42cc...maybe I need to swap my RCS 140 out of my H9 Edge and give this little powerhouse a try? What you guys think?

< Message edited by CrazyHerb-RCU -- Feb 22 2003 7:42AM >

(in reply to flipflop)
       Post #: 28

Oh Ya...one more thing - 2/22/2003 12:56:36 PM   
CrazyHerb-RCU-delete



Posts: 391
Joined: 3/13/2002
From: CA
Status: offline 		Terry/CH,
One thing... the bolts on the 42 are M6x1.00

I think the ones that came with the conversion kit are 5mm.

No biggie though Lowes/Home Depot for 80 cents and your good!

CrazyHerb

(in reply to flipflop)
       Post #: 29

Ignition question - 2/28/2003 9:31:24 AM   
helicool



Posts: 126
Joined: 12/10/2002
From: Seffner, FL, USA
Status: offline 		Hey FlipFlop, that ignition in the picture, is that the stock included on the saw or a CH or other? This is my first conversion and Im looking for the cheapest way to do it. I will get that motor or the 46 for sure if thats the case. it looks much lighter than the HUGE flywheel jobbies!

Thanks

_____________________________

Rich
rmacys@tampabay.rr.com

(in reply to flipflop)
       Post #: 30

Poulan 42 - 2/28/2003 2:25:43 PM   
flipflop


 

Posts: 420
Joined: 12/25/2001
From: Naples, TX, USA
Status: offline 		That's a C-H ignition with Synchro-Spark and a Bosch cap.

(in reply to flipflop)
       Post #: 31

Nuf said - 3/2/2003 8:01:42 AM   
helicool



Posts: 126
Joined: 12/10/2002
From: Seffner, FL, USA
Status: offline 		So, basically I should stick with the 46cc because it has the stock ignition mounted on the motor as opposed to the case, Correct? I just got a Sig 300XS and I want it to be gas but the budget is limited to a conversion. Could I go to a smaller converted motor and still get the same sort of performance?

I'm new to gas so I really am clueless as far as motor sizes to plane sizes...
Any tips, tricks, or other you can throw my way would be great!
Thanks!

_____________________________

Rich
rmacys@tampabay.rr.com

(in reply to flipflop)
       Post #: 32

Poulan 42 - 3/7/2003 10:02:53 AM   
Daniel Ramsey


 

Posts: 117
Joined: 2/26/2003
From: Wasilla, AK, USA
Status: offline 		Its only 4cc's? in a nutshell the 46 is better only if you use a stock magneto, right? the 42-46 are near identical in output? the 42cc is 50 bucks cheaper (Alaska Walmart) and the CH syncro is what I want, so for the money the 42 is better?

(in reply to flipflop)
       Post #: 33

Poulan 42 - 3/28/2003 2:39:59 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		[QUOTE]Originally posted by ZB50
Does anyone have one of these engines in a plane? If so how is it? [/QUOTE]


Love it!

46cc with ch, this is a pic I took durring the building process.

turning a 22 x 8 @6850 about 30lbs of thrust!

switched from a abel muffler ( pictured) to a jtec g38 cause the abel cracked a weld.

The j tec muffler is giving me the same numbers!

had to run a vent line from the carb diaphram plate to the inside of the plane, my first flights were very rich in the air because of in-cowl air pressure, the vent line solved all problems


Something I wanted to do was raise the compression in this engine by "decking the cylinder, can't be done on the 42 or 46cc, but I see the pic of the 54cc has a flat bottom cylinder!!!

Does anybody know what other larger poulan engines have a flat bottom cylinder? If you deck the cylinder to raise the compression you could run 110 octane race gas and get sick power! 110 octane around here is only 3.79 a gallon

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< Message edited by lgodin-RCU -- Mar 27 2003 9:47PM >

(in reply to flipflop)
       Post #: 34

another pic - 3/28/2003 2:50:15 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		installed in cowl with j-tec g-38 muffler

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(in reply to flipflop)
       Post #: 35

vent line added to carb - 3/28/2003 2:51:26 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		pic of vent line on carb

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(in reply to flipflop)
       Post #: 36

Poulan 42 - 3/28/2003 2:55:02 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		another pic,

the white thing sticking out is a "bic pen" i used two of them to extend the carb screws out so they can be adjusted while it is running, just take the ink part out, the small hole in the end of the pen can be pounded on the screw.....these even stay on durring flight!

notice the prop hub does not line up with the cowl?

That is beacause I pushed the engine back to fit more of it in the cowl, I now use a spacer between the prop hub and spinner back plate.




great engine

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(in reply to flipflop)
       Post #: 37

Re: Nuf said - 3/28/2003 3:02:52 AM   
nyrcpilot



Posts: 274
Joined: 9/11/2002
From: Constantia , NY, USA
Status: offline 		[QUOTE]Originally posted by helicool
So, basically I should stick with the 46cc because it has the stock ignition mounted on the motor as opposed to the case, Correct? I just got a Sig 300XS and I want it to be gas but the budget is limited to a conversion. Could I go to a smaller converted motor and still get the same sort of performance?

I'm new to gas so I really am clueless as far as motor sizes to plane sizes...
Any tips, tricks, or other you can throw my way would be great!
Thanks! [/QUOTE]

IMO this motor or any gas motor with the mag still on it is too heavy for the SIG 300xs, I have one of these planes, used to have a brisson 2.4 ( with no MAG! ), now it has an os 160fx. I did not like the flight performance of a 73" plane with gas, you only have 950 sq in of wing area. My wing loading with the gas engine, battery and ign was 38 oz !!! with the os 160 fx it is 29 oz....right were it should be.


one of these motors with the mag may put your wing loading of 40 oz! that would make for some hot landings, horrible stalls, and 3D would be out of the question.

(in reply to flipflop)
       Post #: 38

Poulan 42 - 3/28/2003 5:01:01 AM   
flipflop


 

Posts: 420
Joined: 12/25/2001
From: Naples, TX, USA
Status: offline 		The 60cc Poulan has a flat bottomed cylinder like the 54. The 60s are a little hard to find in this neck of the woods. You might have to do some welding on your piston if you're serious about raising the compression on your 46.

(in reply to flipflop)
       Post #: 39

Hmmm - 3/28/2003 9:57:29 AM   
helicool



Posts: 126
Joined: 12/10/2002
From: Seffner, FL, USA
Status: offline 		Thrust HP Puts wing loading on the SIG at 33.758 oz per sq foot with the plane being 14lbs which is realistic I think.....
I know that Thrust HP is always overconfident about its thrust percentages but it still comes out to 2:1 thrust ratio with a Zinger 20-10 or 20-12

Well, I already have the plane the motor and prop so I guess Im commited. If it ends up too hot I can always go to something lighter later. Ive removed all fins from the flywheel and also lightened it considerably. I got a Prop hub and carb adapter coming from CH in the next few days. I will keep everyone posted as to the progress.

Thanks again.

_____________________________

Rich
rmacys@tampabay.rr.com

(in reply to flipflop)