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Cox Stinger Engine

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Cox Stinger Engine

Post  Sig Skyray on Tue Apr 07, 2015 12:24 pm

Hey guys.

I'm interested in an .049 with more power than the Babe Bee and came across a Stinger .049 at hobbyking.com. It says it pumps out up to 20% more power: "The Cox .049 Stinger has 2 boost ports and 2 bypass flutes which enable it to achieve up to 20% more power than other .049 engines in the Cox range."

Is this plausible/accurate? Does anyone have one?
How does it compare to the Black Widow, Killer Bee or Super Bee?
I'm quite unclear about all the different .049 engines out there.

Greg
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Re: Cox Stinger Engine

Post  TDbandit on Tue Apr 07, 2015 12:52 pm

I'm not familiar with the stinger but it sounds like it's got a Sure Start cylinder and from the pic on HK's site, it's got the standard low compression head on it. It also appears to have a standard product engine backplate. Depending on the backplate it could be equivalent to a BW. I'm not sure where HK is sourcing their engines from so it's hard to tell without trying one out. *Shrugs*
(Bandit)
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Re: Cox Stinger Engine

Post  pkrankow on Tue Apr 07, 2015 12:57 pm

I have no doubt it puts out more power than an old no-boost baby bee. It will also put out more power than a modern baby bee because of the venturi through the fuel tank is larger than on the bee tank.

The cylinders available new are the best porting available. They have one boost per bypass. The 2 boost per bypass actually hurts scavenging which is why the single boost per bypass is superior. With SPI and the intake porting of the larger modern stunt the engine produces as much power as possible.

Cox International sold that engine to Hobby King
coxengines.ca

However the killer bee II has the larger intake than a surestart, which appears to be what the stinger is based on.
http://coxengines.ca/cox-.049-engine-killer-bee-ii.html

Phil

http://hobbyking.com/hobbyking/store/__45398__Cox_049_Stinger_Glow_Engine.html


SPI = Sub-Piston Induction, air is let in through the exhaust under the cylinder skirt.
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Re: Cox Stinger Engine

Post  TDbandit on Tue Apr 07, 2015 1:16 pm

pkrankow wrote:I have no doubt it puts out more power than an old no-boost baby bee. It will also put out more power than a modern baby bee because of the venturi through the fuel tank is larger than on the bee tank.

The cylinders available new are the best porting available.  They have one boost per bypass.  The 2 boost per bypass actually hurts scavenging which is why the single boost per bypass is superior.  With SPI and the intake porting of the larger modern stunt the engine produces as much power as possible.

Cox International sold that engine to Hobby King
coxengines.ca

However the killer bee II has the larger intake than a surestart, which appears to be what the stinger is based on.
http://coxengines.ca/cox-.049-engine-killer-bee-ii.html

Phil

http://hobbyking.com/hobbyking/store/__45398__Cox_049_Stinger_Glow_Engine.html


SPI = Sub-Piston Induction, air is let in through the exhaust under the cylinder skirt.
So it's Bernie that's scorching the engines to HK? cool didn't know that.
Yup the surestart cylinders are what Bernie and Matt are making their new TD cylinders from which have the single boost port per bypass and boy do they run! and about the surestart backplates I have one that I took the restrictor out of and drilled the snorkel and i'm getting close to 18k out of it so yeah, give it air and fuel and it wakes up lol Going to put it on something...sometime. (Bandit)
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Re: Cox Stinger Engine

Post  Sig Skyray on Tue Apr 07, 2015 1:28 pm

TDbandit wrote:
Yup the surestart cylinders are what Bernie and Matt are making their new TD cylinders from which have the single boost port per bypass and boy do they run! and about the surestart backplates I have one that I took the restrictor out of and drilled the snorkel and i'm getting close to 18k out of it so yeah, give it air and fuel and it wakes up lol Going to put it on something...sometime. (Bandit)

How are you checking the RPM? I have a vibrating spring type tach on a plastic plate you dial the spring in and out on to find maximum swing and look at the guage and that's your RPM.
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Re: Cox Stinger Engine

Post  TDbandit on Tue Apr 07, 2015 1:58 pm

Sig Skyray wrote:
TDbandit wrote:
Yup the surestart cylinders are what Bernie and Matt are making their new TD cylinders from which have the single boost port per bypass and boy do they run! and about the surestart backplates I have one that I took the restrictor out of and drilled the snorkel and i'm getting close to 18k out of it so yeah, give it air and fuel and it wakes up lol Going to put it on something...sometime. (Bandit)

How are you checking the RPM?  I have a vibrating spring type tach on a plastic plate you dial the spring in and out on to find maximum swing and look at the guage and that's your RPM.
I use the Globee IntelliTach and a Hanger9 micro digital tach. both are good tachs and are easy to use! heres a pic.

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Re: Cox Stinger Engine

Post  pkrankow on Tue Apr 07, 2015 2:23 pm

TDbandit wrote:
pkrankow wrote:I have no doubt it puts out more power than an old no-boost baby bee. It will also put out more power than a modern baby bee because of the venturi through the fuel tank is larger than on the bee tank.

The cylinders available new are the best porting available.  They have one boost per bypass.  The 2 boost per bypass actually hurts scavenging which is why the single boost per bypass is superior.  With SPI and the intake porting of the larger modern stunt the engine produces as much power as possible.

Cox International sold that engine to Hobby King
coxengines.ca

However the killer bee II has the larger intake than a surestart, which appears to be what the stinger is based on.
http://coxengines.ca/cox-.049-engine-killer-bee-ii.html

Phil

http://hobbyking.com/hobbyking/store/__45398__Cox_049_Stinger_Glow_Engine.html


SPI = Sub-Piston Induction, air is let in through the exhaust under the cylinder skirt.
So it's Bernie that's scorching the engines to HK? cool didn't know that.
Yup the surestart cylinders are what Bernie and Matt are making their new TD cylinders from which have the single boost port per bypass and boy do they run! and about the surestart backplates I have one that I took the restrictor out of and drilled the snorkel and i'm getting close to 18k out of it so yeah, give it air and fuel and it wakes up lol Going to put it on something...sometime. (Bandit)

I recall Bernie mentioning it in one of the threads here. I could be mistaken though.
Phil
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Re: Cox Stinger Engine

Post  roddie on Tue Apr 07, 2015 3:12 pm

Bernie sells that cylinder/piston set as a repro-Tee Dee unit. I bought one for my CEF Reed-Speed model engine, along with the red back-plate with the oversized venturi. The engine is a screamer with a std. plug and single copper gasket running Sig 25% nitro. I initially experienced fuel-draw issues though. I was running suction from a custom made uni-flow hard-tank, using small diameter fuel line. Bubbles formed and ran back through the line toward the tank when the engine ran-out it's exhaust-prime. I had plumbed the tank with 1/8" diameter copper tube.. so I increased to a large-size fuel line by making a compression sleeve for the end connecting to the small nipple on the NVA. This was enough to get the engine to draw fuel consistently.. and sustain peak rpm.




That red back-plate is said to work best with a fine-thread needle conversion.. and run on a fuel-bladder. I don't have any experience with bladders yet.
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Re: Cox Stinger Engine

Post  pkrankow on Tue Apr 07, 2015 3:59 pm

Wow, I am assembling that exact same engine with a Texas Timers fine NVA.

Phil
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