142 replies to this topic

[Pablo]

Track test today at The Dungeon Go-kart race: I won, end of story Who says H arms aren't for racing?

[bluecars]

Congrats Pablo!!! Only took me 1.5 hr. to unscrew my my pretzel.

[havlicek]

Congrats Pablo.  

 

Track test today at The Dungeon Go-kart race: I won, end of story Who says H arms aren't for racing?

 

As I've said before...this all has as much or more to do with who builds the motor, car and then drives it (*in this case all the same guy).  You're one of the guys who I worry about most when I sell them an arm or a motor.  Why?...because if it doesn't go well, then it's all on me. 

[Bill from NH]

I haven't heard of other US raceways holding a "run what you brung" class, but they ought to try. My first two years of commercial racing in the late 60's was "run what you brung" racing. It was both very competiive & a lot of fun. Class racing for me started in '69 when I relocated to another state.

[Pablo]

Bill asked if anybody had put a G20 motor in a Go-kart yet.

I beat Bud's X12 C can motored kart last time, with a Havlicek mini-X12 wind arm in a PS 4002B setup.

 

It takes effort to get to the top of a motor war, and it takes even more effort to stay there.

I removed the winning motor, bagged and labeled it for a future project.

 

In goes the new G20 Havlicek mini motor. Draws 1.7 amps at 4 volts during breakin.

I fed 'er some volts to hear it sing for a second. hehehehehehe

 

[zipper]

I had G20 in my VW Womp. Handling was - well...

[Pablo]

I know exactly what you mean, Pekka

You get to a point where the car goes from corner to corner so quickly, "handling" isn't really a proper term for it

[Pablo]

Gearing is now 64P, 8/36, .710 wheels.

Drivetrain test was spooky good

 

[Pablo]

Race test today of the H Power mini-G20: Plenty of power and brakes, motor ran perfectly and I couldn't ask for more power at all. But, I think this is about the limit of useable power for Go-karts

 

My kart needs 2 improvements:

-she was geared a little too tall (winding out a little late on the long straight). Easy fix.

-I had more power than the X12 motors but I couldn't use it because the speed crazed kart fanatics have installed wing kits and they are working. So to "keep up with the Jones's" I'll be joining the karting aero club next time

 

The motor and car worked fine and I was happy with 3rd place

[Bill from NH]

Wing kit on karts? Is unlimited glue on the horizon?  

[Pablo]

No, The Dungeon has plenty of traction and no gluing the track allowed    

[Pablo]

Forget everything I said about changes - the kart rules have changed

The H20 motor was removed, cleaned, bagged, labeled "H20, one race, excellent" then stowed in the modern motor box of horrors. Maybe I should have added a side note - "makes the car hit the bank fast and hard enough to shift the track"

 

I need to do the following:

- new Phoenix motor, gears 14/35 with same OD wheels (.700-ish).

- 5/8" tall spoiler

- 1/2" min. front wheels

 

So I gave 'er a complete teardown, including the Ralph Thorne Racing chassis skin.

After testing, I'll probably install a new one.

 

BB's were still fine, and both chassis sections still completely flat (kudos to JK - the C43 is strong). Chicagoland flag and new TQ 20 gauge wires are ready.

 

[Pablo]

I abandoned the concept of including the forward bite bar as an axle for fronts.

Too complex, too heavy, too many things to go wrong.

 

Here's what I did - "rivet counters" please forgive me

 

 

Phoenix broken in under water and given a 10 second lighter fluid splash.

Secured with a Gator Bob motor brace.

Man, these mags are so strong I thought my chassis was bent when I installed the axle.

Anybody else experience this? I couldn't even tell if the bushings were aligned

 

 

[Pablo]

I solved the problem of not being able to verify the bushing alignment by using a piece of 3/32 aluminum tube - they are perfect as I suspected

 

 

I've heard a couple theories on the issue of the mags pulling so hard it "binds" the axle.

I wish a G7 racer would chime in here.

[Martin]

Interesting problem so I did a little digging because i thought I would be clever and stick a narrow strip of lead over the magnet, Wrong. But a Titanium or aluminum axle may be the answer, just don't crash.

 

• No material can block a magnetic field
• Lead most definitely has little to no effect on magnetic fields

• If you want to block out magnetic "force," your best bet is to re-route magnetic field lines (lines of magnetic flux) around the object that is sensitive to those lines. Do this by shielding the object in a material with a much higher magnetic permeability of the surrounding materials.

[Martin]

I just noticed something Paul, if the motor were to drive off the end bell side the magnets would be further away from the axle. Would that good or bad for handling.?  

[old & gray]

Paul,

 

Good plan using the aluminum tube when it is straight. For a non magnetic axle try titanium or 300 series stainless steel.

[Bill from NH]

K&S sells 12" lengths of 3/32 stainless, stock # 87133. I don't know if it's the same material as Bob mentioned above or not.

[old & gray]

K&S sells 12" lengths of 3/32 stainless, stock # 87133. I don't know if it's the same material as Bob mentioned above or not.

 

300 series SS is non magnetic

400 series SS is magnetic

[MSwiss]

That's not strong enough for a rear axle.

 

According to a previous thread, Foamy says the stainless is weaker than piano wire.

 

Guys are racing these motors, in normal cars, with normal axles.

[Pablo]

[Martin]

So Paul, I use 3/32" and 1/8" Tungsten for TIG welding its not magnetic and really strong straight and ground to size.  I will warn you it is heaver that Steele. 

 I assume my suggestion of turning the motor 180 degrees was not to your liking.As in its such a bad idea it not worth a response. Do those motors have timing or would it move the weight forward and to the right?

Can those motors be mounted from either end?

[Pablo]

Yes, FK motors are timed.

Yes, if mounted 180 degrees out, it would move the weight forward and to the right slightly.

Yes, an FK motor could be mounted either end - there is no rule against it.

 

The motor would rotate in the wrong direction, you wouldn't be able to make it work properly without a lot of junk engineering, moving the motor slightly forward and to the right wouldn't have much effect, and in the end it wouldn't solve the problem.

 

The thing that surprises me is, I'm the only person I know of who has noticed and reported the situation

[Martin]

I will send you a 3/32" Tungsten axle if you want to try that? PM your address with a length, I checked It is non magnetic. It could be your little speed secret? 

[MSwiss]

I think the problem with tungsten axles is they will snap in a moderate crash.