Go Back   DIY Go Kart Forum > Other Stuff > Off Topic Forum

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 05-17-2019, 12:37 PM
NewbCarter NewbCarter is online now
Senior Member
 
Join Date: Sep 2015
Location: Solin , Croatia
Posts: 349
Thanks: 71
Thanked 59 Times in 56 Posts
Default GX200 Turbo project

More pictures , and updates soon ..
Attached Thumbnails
60360576_2217626684987352_3723680561949048832_n.jpg   60479740_2261432500747245_7999459657762471936_n.jpg  

60787446_599937433817942_1658106514423939072_n.jpg  
Reply With Quote
  #2  
Old 05-17-2019, 05:40 PM
itsid's Avatar
itsid itsid is offline
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 9,695
Thanks: 1,321
Thanked 4,108 Times in 3,070 Posts
Default

nice blades

So I see you're going mikuni there..

am I mistaking or were you planning on an EFI conversion *headscratch*,
and if I'm not... what happened to that?

In any case.. nice.. cute little turbo you got there;
yes please, more pics and infos.. as much and many as you can in fact .

'sid
__________________
Jokes about german sausage are the wurst.
Reply With Quote
  #3  
Old 05-18-2019, 09:05 AM
JTSpeedDemon's Avatar
JTSpeedDemon JTSpeedDemon is online now
Currently flathead-crazed
 
Join Date: Jan 2019
Location: Texas
Posts: 1,296
Thanks: 186
Thanked 124 Times in 121 Posts
Default

Where'dya get the turbo?
__________________
Local Bird Engineering Nut
Reply With Quote
  #4  
Old 05-18-2019, 10:37 AM
NewbCarter NewbCarter is online now
Senior Member
 
Join Date: Sep 2015
Location: Solin , Croatia
Posts: 349
Thanks: 71
Thanked 59 Times in 56 Posts
Default

Quote:
Originally Posted by itsid View Post
nice blades

So I see you're going mikuni there..

am I mistaking or were you planning on an EFI conversion *headscratch*,
and if I'm not... what happened to that?

In any case.. nice.. cute little turbo you got there;
yes please, more pics and infos.. as much and many as you can in fact .

'sid
Yep , draw through setup with a Mikuni clone , 26mm . Tried it out before hand , works very well , but even with the needle all the way down ( highest notch , least possible fuel ) it was still waay too much mixture for a stock GX200.

The G200 threw a rod , thus its of no use . I tried to find a suitable replacement , and i did , but really never got the time to do it properly . This setup is to show it can be done , but with no fancy business .

---------- Post added at 10:27 AM ---------- Previous post was at 10:26 AM ----------

Quote:
Originally Posted by JTSpeedDemon View Post
Where'dya get the turbo?
Turbo is off Alliexpress , shipped to me from France , arrived in 3 days . 175 USD , shipping included . (+ since i have some premium membership discounts , final price was around 150 USD ).

---------- Post added at 10:37 AM ---------- Previous post was at 10:27 AM ----------

As of details .... its not that interesting to be honest .

Draw through setup with the mentioned carburetor , a hydraulic pump ( either toroidal or geared ) will be used as a source of lubriaction , with a 120mm watercooling radiator i have leftover from a PC build serving as the oil cooling .

Why the radiator ? Well , the GX200 technically has no oil cooling , and even if the turbo doesnt push much boost ( im aiming at .5Bar , so a relative 50% increase in capacity ) it will still heat the oil up quite a bit , so a radiator is a must .

I was thinking of hiding the radiator in the fan shroud , so it gets the max possible cooling .

So oil flow would go like this : Sump (via the drain plug) -> radiator -> pump suction side -> turbo -> drain back to the hole leftover from the low oil cutoff switch found stock on the GX.

Piping il try to keep as short , especially the exhaust side , the GX will need all the help it can get to spool this turbo up . No intercooler aswell , since if i did my math correctly , the carburetors venturi effect with the fuel being atomized should bring the intake air temperatures down enough so even after being compressed by the turbo , it should remain under safe limits .

No BOV or such either , since it would be throwing the mixture out in the atmosphere .
Reply With Quote
The Following User Says Thank You to NewbCarter For This Useful Post:
JTSpeedDemon (05-18-2019)
  #5  
Old 05-18-2019, 11:41 AM
NewbCarter NewbCarter is online now
Senior Member
 
Join Date: Sep 2015
Location: Solin , Croatia
Posts: 349
Thanks: 71
Thanked 59 Times in 56 Posts
Default

Close up of the turbine side of things , and the compressor side.
Attached Thumbnails
IMG-20190515-WA0049.jpeg.543a86bf7b86bb78f462b83718f7b015.jpg   IMG-20190515-WA0051.jpeg.e449244e07d360985965498be326e2aa.jpg  

Reply With Quote
  #6  
Old 05-21-2019, 01:23 PM
NewbCarter NewbCarter is online now
Senior Member
 
Join Date: Sep 2015
Location: Solin , Croatia
Posts: 349
Thanks: 71
Thanked 59 Times in 56 Posts
Default

Not much pictures so far , have to collect all the components first , and figure out a mount for the turbo , as it is not as light as it might seem to be ( 2,75kg ! ) , so it needs a proper mount .

I will also be going for a different carburetor setup , preferably a flange mount Mikuni (30mm) , with a power jet . The current carburetor fits but does not have a power jet , which i had plans for .

Mainly running the power jet from a seperate fuel bowl / tank , that will be mounted near the carburetor , but will be fed with a water-methanol mix .

Reason why is mainly safety / safeguard from engine knock caused by excess boost / heat in the combustion chamber since i am not so sure the carburetors venturi effect will be enough of a heat soak for the boost level .

Boost will be controlled and monitored via a simple T-fitting between the boost port on the turbo and wastegate actuator , and probably a small ball valve of sorts to act as a leak if i want more boost.

The crankshaft will need to be lengthened another 10mm to accomodate a pulley to drive the oil pump to feed the turbo for lubrication .
Reply With Quote
  #7  
Old 06-07-2019, 05:08 AM
NewbCarter NewbCarter is online now
Senior Member
 
Join Date: Sep 2015
Location: Solin , Croatia
Posts: 349
Thanks: 71
Thanked 59 Times in 56 Posts
Default

Ordered some AN4 braided steel line and some AN4 fittings to test fit on the turbo and pump , to see how it all adds up .

The pump i decided to go for is a cycloid style hydraulic pump with the following specs :
- 0.8cm3 / revolution
- 2000 RPM max
- flow of 1.5L/h at 1800RPM
- pressure range of .2Bar to 5Bar
- 1/8" fittings

I will need to DIY some sort of pressure diverter valve ( was thinking along the lines of a T fitting with a valve on the turbo line while the other T connection goes back to the engine ) as apparently the turbo does not need more than 6 psi of oil pressure ... which i frankly doubt . I will start off at 1 Bar , then drop the pressure down if i notice the seals leaking .

Also ordered a basic analog boost gauge and pressure regulator to be used to monitor and control boost.
Reply With Quote
The Following User Says Thank You to NewbCarter For This Useful Post:
Denny (06-07-2019)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 01:01 PM.