RE: ST2300 Testing and Experimenting  
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RE: ST2300 Testing and Experimenting - 7/20/2007 3:26:53 AM   
coupar



Posts: 55
Joined: 3/17/2003
From: Leesburg, VA, USA
Status: offline 		Not24:

I agree we dont disagree! I think you are correct on the carb too. I have never been an OS fan (after the ABN cracked pistons) and I have always bought cheaper engines, never had a problem getting them tuned. But the 2300....mann it drove me crazy. The on board glow was such an instant success for myself and one of the other club members it does make you wonder whats going on inside that head(!).

Hay thanks for all the great info you reported here. It was really helpfull and helped me get the engine mid-range running just great.


Cheers for now!


(in reply to vasek)
       Post #: 626

RE: ST2300 Testing and Experimenting - 7/24/2007 5:34:44 AM   
NikolayTT


 

Posts: 573
Joined: 9/29/2002
From: Tampere, FINLAND
Status: offline 		Hi Fellows,

I tried for 1 hour time but I did not find in this long discussion any experiment being made on supplying
directly(!) pressure from the crankshaft-case into the fuel tank, i.e. not using Perry pump at all. Anybody
has done that and if yes what is the outcome ? I have that on my old italian ST-46 since 10 years ago
and it was working fine. Now I wander if it would help in this ST-2300 set up.
Thanks for elaborating on the issue.
Nick

(in reply to Not24)
       Post #: 627

RE: ST2300 Testing and Experimenting - 7/24/2007 5:43:38 AM   
Kweasel


 

Posts: 1084
Joined: 1/7/2004
From: fort worth, TX, USA
Status: offline 		Crankcase pressure works very well at full throttle. Its usually not suitable for R/C engines unless a check valve and requlator is used.

(in reply to NikolayTT)
       Post #: 628

RE: ST2300 Testing and Experimenting - 7/24/2007 5:50:55 AM   
NikolayTT


 

Posts: 573
Joined: 9/29/2002
From: Tampere, FINLAND
Status: offline 		Thanks Kweasel,
Please coment on this too: If two check-valves are used:
- first in the path from engine-to-fuel tank to prevent overflow in engine crankcase, and
- another one in supply to engine to (bypass) return the extra fuel back to tank, which is
fact seems to be kind-of-regulator based on the spring in the check-valve,
would this be worth trying ?
Regards,
Nick

(in reply to Kweasel)
       Post #: 629

RE: ST2300 Testing and Experimenting - 7/24/2007 9:33:24 PM   
buzzingb


 

Posts: 1507
Joined: 9/4/2002
From: Bruce, MS, USA
Status: offline 		Not24, I too have a ST90 that runs great and had the same thought as you but for now I don't want to experiment since the 2300 is running so well. But it makes sense that if a Magnum 91 carb worked, the ST90 carb might work as well.

The battery/ toggle switch does help but it gets old trying to charge that extra battery. The 17X6 prop I have seems to rev-up well compared to a 18X6. The engine pulls either but I like the faster 17".

_____________________________

Buzz

(in reply to NikolayTT)
       Post #: 630

RE: ST2300 Testing and Experimenting - 7/25/2007 12:29:35 AM   
Not24



Posts: 999
Joined: 12/7/2002
From: Gloucester, VA, USA
Status: offline
quote:

ORIGINAL: buzzingb

Not24, I too have a ST90 that runs great and had the same thought as you but for now I don't want to experiment since the 2300 is running so well. But it makes sense that if a Magnum 91 carb worked, the ST90 carb might work as well.

The battery/ toggle switch does help but it gets old trying to charge that extra battery. The 17X6 prop I have seems to rev-up well compared to a 18X6. The engine pulls either but I like the faster 17".



Try a 17-8 or 16-10, just for kicks. The thrust comes on at a lower rpm, giving more of a four stroke torquey feel. When you do this, you don't need full throttle as often, and have to cruise at a lower power setting too, to keep the speed down. I like it better when the engine sounds like it's working, not just revving and going nowhere.

_____________________________

Fly it till you break it!

(in reply to buzzingb)
       Post #: 631

RE: ST2300 Testing and Experimenting - 8/4/2007 4:36:56 AM   
PA BEN


 

Posts: 323
Joined: 12/2/2005
From: Port Angeles, WA, USA
Status: offline 		Puddy Tatt what size of a fuel tank do you have and how long is your run time? Glad to hear someone has good luck with this engine.

(in reply to Not24)
       Post #: 632

RE: ST2300 Testing and Experimenting - 8/8/2007 3:30:13 PM   
MikeRuth



Posts: 289
Joined: 3/6/2006
From: Tarzana, CA, USA
Status: offline 		Just a little comment on the ST2300 and a Exceleron 90 and a perry pump and perry carb.

this combonation has a tank high condition. therfore when the tank is full it will cause a gravity feed right through the pump.

I talked to Conley Precision Engines Inc. and they said that would be the case. They suggested running some extra fuel line high up to prevent that.

I'll be experimenting a little, since this is my only issue now.

My only other choice is to cut the nose of the plane off at the firewall and possibly angle or side mount this beast. Lotsa work


Mike


(in reply to PA BEN)
       Post #: 633

RE: ST2300 Testing and Experimenting - 8/8/2007 5:55:33 PM   
davej78



Posts: 199
Joined: 2/21/2004
From: ColchesterEssex, UNITED KINGDOM
Status: offline 		I have an onboard glow fitted to my ST2300 that powers my Goldberg Sukhoi 26. The onboard unit is made by South Herts Models here in the UK and uses the plug itself as a temperature sensor to determine whether or not glow is needed, this is hooked up to a 4300mah sub c cell and gives a good few flights between charges. The motor is easy to start transitions sweetly and is reliable and the tickower can be set really slow.

_____________________________

You can always tell an engineer, just not very much

(in reply to coupar)
       Post #: 634

RE: ST2300 Testing and Experimenting - 8/8/2007 6:37:51 PM   
RCPAUL


 

Posts: 619
Joined: 12/15/2001
From: Gahanna, OH, USA
Status: offline 		I had to remove my high-speed needle valve in order to fit a cowl. In the process, I found that there is a spring and o-ring on the needle. Neither part is shown on the parts list or available from Tower. I wonder if this was an improvement and explains why some of the newer ST2300s seem to run better. Has anyone found this o-ring on an older engine?

Paul

_____________________________

Gosh, model airplanes are not a matter of life and death --- they're more important than that!

(in reply to davej78)
       Post #: 635

RE: ST2300 Testing and Experimenting - 8/8/2007 7:15:35 PM   
davej78



Posts: 199
Joined: 2/21/2004
From: ColchesterEssex, UNITED KINGDOM
Status: offline 		My ST 2300 has both the parts you mentioned fitted its an old Italian unit rather than one of the later Chinese versions, I have both.

_____________________________

You can always tell an engineer, just not very much

(in reply to RCPAUL)
       Post #: 636

RE: ST2300 Testing and Experimenting - 8/9/2007 9:01:07 AM   
speedster 1919



Posts: 1467
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline 		That High speed needle O-ring and spring are servicable from Super Tigre only as a complete high speed needle only. About a $5 part and is used ever since they changed from a bent wire needle . If you have an older wire needle you can take needle and packing nut off spraybar and use new design HS needle. I'm sure many ST's are missing these parts when taken apart sometime. The engines will run without the O-ring and spring but will leak fuel a little around threads and suck air at Idle............

_____________________________

Hey Buddy -That was the most spectacular crash I've ever seen , That rolling cart wheel with parts slinging out was cool...

(in reply to RCPAUL)
       Post #: 637

RE: ST2300 Testing and Experimenting - 8/9/2007 12:16:59 PM   
RCPAUL


 

Posts: 619
Joined: 12/15/2001
From: Gahanna, OH, USA
Status: offline 		That HS needle valve assembly is $25.99 from Tower not $5! I do not understand why they cannot make these parts availabe or why they are not shown on the parts list.

Paul

_____________________________

Gosh, model airplanes are not a matter of life and death --- they're more important than that!

(in reply to speedster 1919)
       Post #: 638

RE: ST2300 Testing and Experimenting - 8/10/2007 9:45:04 AM   
speedster 1919



Posts: 1467
Joined: 12/17/2004
From: Martinsville, IN, USA
Status: offline 		RCPAUL ---I don't know what your smoken or you need new glasses. But here is the link for Tower on a HS needle that fits .34-4500 engines and if you look hard the O-ring can be seen peeking out of the brass with a spring behind it..................
The price is $5.49 I was off 49 cents (sorry)

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFY19&P=Z

_____________________________

Hey Buddy -That was the most spectacular crash I've ever seen , That rolling cart wheel with parts slinging out was cool...

(in reply to RCPAUL)