pissedoffpete

Does anyone have opinions on this engine? Stats look like it would be a screamer in a Black Jack 26. Has anyone tried this mod? Would like opinions. Appreciate all replies

Spetz

I was thinking about buying this engine before, and even though I have no experience with it, I came down to the conclusion that the Aqua .18 motor would most likely be quicker than this engine.
The stats aren't worth looking at as if I remember correctly it supposedly makes 1.8hp and 50,000rpm which it clearly would never get close to this therefore the stats are nothing more than a marketing lie
Additionally for the $50 it costs, you probably get what you pay for

Sean Bowf

Spetz, I think the go-tech engines were 60 something on ebay, there is another "go" engine that is about $100. I think both were made by the same company, but the go-tech was a lower quality engine that was never supposed to leave asia.

I agree that the specs are BS...and if a company is willing to lie about their specs (by that much)...then who knows about the engine itself. I do believe that 1.8 HP is doable on a .18 engine, but don't see 49,000 RPM...and don't think either will be done with 3 ports...

I would be curious to hear results from someone that has run a CVRM in their boat, and compared this to the Go engine. I think (??) the CVRM was a 3 port engine...it was rated at 1.35 HP, at 28k RPM.

Sean

Spetz

Yeah 1.8hp is doable from a .18 motor but definately not from this motor

Woodmandan2

Alright,
Go Tech engines are the Car and Truck versions of the engines, the Go Marine are the official marine version, the marines have special things for marine use like a bigger carb, a flat bottom of the crankcase, and other things that the car engines do not have. I have run both Go Technology and Go Marine and although they are a PITA to break and and they burn plugs like crazy, I got my homemade boat to go 42 with a Go .21 Marine engine. They are not bad engines, and all other engines cost the same to build, just US markets will pay MUCH more for them than the chinese will. I bought one of my helicopters for 170 in china and in ameirca it would cost 549.99. That engine problay makes 1.0 horses and 30,000 rpm's, and it is honestly not a bad engine for the price, but if you go os buy the car version for 110 and put on the marine head.
Dan

Spetz

The car version of the 18 CVR went up to 130 now and the water cooled her is 40 USD

Woodman, more to the point though, would you think this Go motor is more powerfull than the standard Aqua motor, which is an OS motor

spmcameron

I've run my Go Engine Marine .18, and had no problems at all in my Supervee 27. Here is a link to a recent video at the end of the day dialing in the engine. The prop is a Graupner K Series Carbon filled 42mm, and 30% Sidewinder Fuel. Hope this helps.
Sean
[link]http://www.youtube.com/watch?v=CQTu66LhrT0[/link]

Spetz

Is it more powerfull than the standard Aqua .18 motor the SV27 comes with?

spmcameron

I would have to say yes. I broke two con rods on the stock engine after spending $80+ on parts, I chose to replace it with one of the Go Engines and has worked great for me. I'm still running a "plastic" prop on it right now, but have picked up a X642 to try out as time permits.
Sean

Spetz

That's surprising to hear. I would expect the Aqua motor to be more reliable and more powerfull

spmcameron

Well if you look into the blocks, tha Aqua motor has three ports in the sleeve, but only two milled ports in the block. The Go Engine, has all three ports in the block milled, plus they're ~10-15% larger than the ones on the Aqua motor. Check out the Go Engine Marine website, there are some pretty good pictures of the block milling.

ryan_t888

I don't believe any .18 size engine will come close to 1.8hp.

As a comparison 1.8 hp converted in to wattage is 1350w. After electric motor efficiency is included it's about 1680w. To get an idea of what this kind of power means in electric form, it would push a 38" rigger to speeds near 70mph.

My 27" rigger hits speeds of 54mph. I'm running around 400w after efficiency is taken away. This equates to about .55hp.

Ryan

Spetz

Actually an OS 18TZ was dyno'd at 2.28hp

Wattage from electric motors is different from watt (Kw) power from nitro motors.
Don't forget electric motors have bucketloads of torque from 1 rpm upwards

ryan_t888

There's absolutely NO WAY a .18 makes 2.28hp. I can guarantee that.

Wattage of motors is equal to hp of engines. Power is power, there’s not just 1 unit of power. Conversion factors allow you to convert to one unit in order to compare.

And the abbreviation for watt as you stated is not (kw) it is w. kw stands for kilowatt or 1000 watts.

What you just told me is like me saying when I measure my, lets say SuperVee 27 at 68.58cm and you measure the SuperVee27 at 27� we are talking about different lengths. No. They both mean the same thing. Converting the units will prove this.

Torque and RPM is the product of horsepower. We are talking about power which already takes in to account torque. In other words it is irrelevant to this comparison.

Ryan

gralls4771

I have a Blackjack 26 with the Go 18 side exhaust. I've run about 4 tanks through it now, but when I pulled the start cord today all of this bright green stuff splattered out all over the boat and down the front of my shirt. I think it might be lubricant comming out of the pull cord housing. Everything still seems to work as it should. Has anyone ever had this happen?

Spetz

Ryan,
I know Kw is 1000 watts but when talking hp you convert to Kw
However, not all motors with 1 Kw will make the same torque
Take diesel engines compared to VTEC engines. A VTEC can produce say 125Kw and only make 150nm of torque as opposed to a diesel that makes 125Kw will make an easy 300+nm of torque

Spetz

Forgot to ask,
gralls4771, how do you find the GO 18 compared to the Aqua 18??

gralls4771

I've never had an aqu 18, so I dont know. I've got a few dynamite engines and a Vertex, so far the Go seems the strongest.

ryan_t888

Spetz

When talking hp you can convert to what ever you want, whether it would be khp, watt, kilowatt, megawatt, gigawatt, BTU's, PS ect. It's all the SAME.

That diesel engine will not be spinning nearly as fast as the Vtec. Toss in a transmission so output speeds are the same and they both will have the exact same output in terms of torque and RPM. Thus same hp. Torque is irrelevant in my comparison. A 1.8hp nitro engine and 1.8hp electric motor will move the same hull at about the same speeds.

As I mentioned hp is hp, it's all the same. Don't let these marketing Dyno's lead you to believe that these tiny engines are producing over 2hp. It's all pure marketing. When choosing an appropriate nitro engine you can not compare hp ratings as they are all false.

Ryan

Spetz

So what do you expect these engines to be making?
To be honest I also think 2hp sounds too much, both in the sense that they are too small but also that 2 hp in a car that weighs ~2kg would probably be a lot faster than what it really is

Though it still can be the torque thing? If i remember correctly hp is measured over a time period or something and therefore higher rpms yield more hp where as torque is an instant measurement (spinning force)

Sean Bowf

The article that put the TZ over 2 HP was put out by OS...so if you believe any of the rest of their numbers, you would have to put some value on the 2+ HP number...

Sean

gooycheese

What type of boat is the x642 with an .18 engine going to push, sounds like a big prop for a .18?


Paul

ryan_t888

There's many ways of measuring hp, here's an easy mechanical formula for it. This is what Dyno's use to calculate hp. Hp is determined instantaneously as the RPM and torque applied are instantaneous. An engine is constantly producing different amounts of power throughout its run.

hp = tq * w / 5252 - where tq is torque applied and w is RPM.

Another formula for power along the lines of what you may be talking about is
Power (watts) = Work Done / time - where work done is
Work = Force x Distance
An example of how this works is lets say I run up a set of stairs how much power do I apply. I weigh about 750newtons, travel up 10m of staircase and do it in 30 seconds.

Power (watts) = 750 * 10 / 30
= 250 watts or roughly 0.34hp

At one of my club races I run my 27" rigger with a motor that produces about 33 000RPM loaded. One of the riggers I race against is also 27" and runs a motor that produces about 25 000RPM loaded. It weighs just about the same but uses a prop that is larger than what I use as it creates more torque but less RPM. I'm running around 400watts where my opponent is running around 400watts. Even though the motors are different we are neck and neck down the straight away where neither one of us can pull away.

My point is even though motor A produces a lower X amount of torque and motor B produces a higher X amount of torque they still traveled at the same speeds. This holds true as hp is equal. I can spin a smaller prop at greater RPM's and he can spin a larger prop but at slower RPM's. The end result is prop pitch speeds are very close.

I would guess most .18’s would fall around 0.3-1.0 hp realistically. Comparing discplacement and hp, that is a TON of power for this size. These little engine can produce more hp than the average human!

Ryan

gralls4771

My brain hurts

spmcameron

The X642 will be pushing a Supervee27 with the Go .18 in it. Hopefully this helps.
Sean