i recently did an episode with this go-kart
where i mount the turbo diesel engine
and then i adapt the cvt torque converter setup
to take advantage of the torque and get a high top speed
problem is the top speed was only 35 miles per hour
the reason for this is because the cvt setup that i purchased
is made for a gas engine which has a much higher rev limit
than the diesel engine does
the diesel redlines at about 3 700 rpm
a gas engine is probably double that
so the way i see it is right now we have a 10-tooth drive gear
i'm going to need a 20 tooth drive gear in order to make up for that rpm shortage
but i could not find that gear anywhere online
i'm going to have to make it
and the one thing that i was not looking forward to was making a sprocket
because anybody who's made a sprocket before
in a cnc machine or something like that knows
that the geometry of the teeth here are a little bit of a pain to draw in CAD
it definitely takes some time
so I was really happy to find out that the water jet machine that I have
has a feature in the software that allows you to quickly
mock up these sprockets or drive gears
check this out
you just right click on shapes and go right into the sprocket shapes generator
and this is absolutely amazing
you just click on sprocket
the number of teeth we want is going to be 20
we put our chain pitch which is the width
in between the links measured on center of each pin
and then we measure our roller diameter
that's going to be a .31 roller diameter
and then you hit go and bam there's our sprocket right there
all we have to do now is make a hole in the center
for the jack shaft and a cutout for the machine key
and we're ready to go
my tool path is loaded the next thing I need is some material for our gear
and thats what i have my scrap shelf for
i'm looking for some half inch thick mild steel this is 3/8" so
that should do the trick
we're gonna place it right on our cutting bed here and that's it
there's our man sprocket
this machine is a rock star
we just took a piece of scrap metal that was headed to the trash
and made it into a usable part ... almost
next thing i need to do is assemble the entire torque converter
the water jet did a tremendous job at cutting out that sprocket
that is absolutely perfect look at that
as everybody suggested i went and bought a 40 series torque converter
i have it right here
and i don't see much difference between this and the 30 series
except for the physical size because the thickness of the belt is the same it's 3/8 of an inch
but however since the 40 series torque converter is physically larger
you're going to have a larger circumference
you're going to have more surface area contact via the length of the belt
that's in contact with either one of these pulleys at any given time
but unfortunately i'm not going to use the 40 series because
i need to make shafts and all kinds of adapters and stuff and
i'm just not going to do that right now
i'm going gonna run it the way it is with the 30 series torque converter
whatever we get we get
this is a 20 tooth sprocket and by the numbers
we should be able to achieve a top speed of double
what we did before with the 10 tooth sprocket
which was 34 miles per hour if the engine has enough power
to sustain 70 miles per hour
so next thing i need to do is lengthen the chain
all set nice and tight
it's rubbing on this bar here
i'm just going to throw that in the water jet real quick
i'm going to open up my tool path type in the thickness of my material
the type of material that i'm going to water jet
yep looks about right
for this i'm just going to use the saw feature
i'm going to just cut
right here from that part of the circle straight into this corner about 45 degrees
that looks good there you go much better completely clear
yeah that gear is very aggressive
look at how big that gear is now compared to the torque converter
and also compared to the drive sprocket
i think this drive sprocket is like 35 teeth and this is 20 teeth the gear is massive
so i think this thing is going to get a good top speed
last thing i have to do is put a boost gauge on here which i forgot last time
and i'm going to pull that gps off and put a race logic v box in its place
that's about it let's hit the road
i just arrived at the test location and this time since i'm going for a top speed run
i need a nice long straight that's going to be safe
so i had to come to an actual airport it just so happens that
sherlock is starting an RC jet club called sky ranch jet club right in this very location
i'm going to pull the go-kart out start this thing up
and just do one straight run
from end to end and see what my top speed is with this turbo diesel setup
with the 20 tooth gear see what it does
all right here we go let's do it
all right
all that hay made me spin around
so i hit about 45 miles per hour which isn't that much better than the previous run
but it was better
man that thing like tore me up
i mean the tires are so hard and there's a bunch of little bumps and stuff in this runway
and uh yeah that was fun so that's it
that's the top speed on that go-kart with the 20 tooth gear at Hobart sky ranch airport
so make sure you look in the description below
i'm gonna leave information to his jet club
that was it that's the top speed
this is the last episode with that turbo diesel on this go-kart
i only did this to satisfy everybody's curiosity who said they wanted to see it
other than that i am ready to mount the jet engine on this thing
and do a top speed with the jet engine
the v box works fantastic as you can see it was super accurate
45 miles per hour
thanks for watching tell me what you think in the comments below
and check out my website shopwarpedperception.com
i have a link to most of the equipment that I use including the drone
as well as information on sherlock's jet club
so again thanks for watching see you later see you in the next video
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