Go Back   DIY Go Kart Forum > Other Stuff > Good Deals!

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 06-17-2019, 05:48 PM
bob58o's Avatar
bob58o bob58o is offline
Sick, Tired, and in Debt
 
Join Date: Jan 2016
Location: Under the Rothschild Whip
Posts: 7,472
Thanks: 3,214
Thanked 2,193 Times in 1,711 Posts
Default AMR 300 Supercharger

This went way up in price for a while. I got called a Richard on FB for posting this when I seen somebody selling theirs for $300.

$207 with free shipping is the cheapest Iíve seen for a while. This is 300cc per revolution. The 500cc is more commonly available and usually cheaper.

https://rover.ebay.com/rover/0/0/0?m...2F264330982535
__________________
History doesn't repeat but it rhymes Name a successful fiat currency in the last 5k years
Reply With Quote
The Following 2 Users Say Thank You to bob58o For This Useful Post:
Joe-405 (06-20-2019), landuse (06-18-2019)
  #2  
Old 06-18-2019, 06:58 AM
Flyinhillbilly's Avatar
Flyinhillbilly Flyinhillbilly is offline
The great cornholio
 
Join Date: Oct 2015
Location: North West Arkansas
Posts: 1,963
Thanks: 2,123
Thanked 863 Times in 604 Posts
Default

I’ve been eyeing those since I found out they exist.
__________________
You can't drink all day if you don't start in the morning
Reply With Quote
  #3  
Old 06-21-2019, 04:35 AM
Denny Denny is offline
Canned Monster
 
Join Date: Sep 2014
Location: Mayberry, Indiana
Posts: 1,470
Thanks: 86
Thanked 671 Times in 502 Posts
Default

Have I got a project for one of those!


Denny
Reply With Quote
  #4  
Old 06-21-2019, 08:43 AM
mckutzy mckutzy is online now
Senior Member
 
Join Date: May 2008
Location: bc, canada
Posts: 7,155
Thanks: 783
Thanked 1,702 Times in 1,398 Posts
Default

How much hp to drive the "beast"????
__________________
10yr+ club..... My current ride- http://www.diygokarts.com/vb/showthread.php?t=5461
Reply With Quote
  #5  
Old 06-22-2019, 12:34 AM
bob58o's Avatar
bob58o bob58o is offline
Sick, Tired, and in Debt
 
Join Date: Jan 2016
Location: Under the Rothschild Whip
Posts: 7,472
Thanks: 3,214
Thanked 2,193 Times in 1,711 Posts
Default

No idea on the amount of HP it would consume. But a 1:1 ratio would theoretically make 27 pounds of boost on a 212. So I’m guessing it would most likely be underdriven. If underdriven 2 :1 so the crank spins twice for each rotation of the blower’s pulley, then it should be 6 lbs of boost on a 212. If underdriven so the blower pulley spins twice for every 3 crank revolutions, it should theoretically make 13 lbs of boost.

Otherwise, a 1:1 ratio should make about 6 lbs of boost on a 420cc.

Someone check my math...
212cc per two crank revolutions means a 212 at 100% VE pumps 106cc of air per crank revolution.
If the blower pumps 300cc per revolution then...
300/106 = 2.83
Since atmospheric pressure is 14.7 psi, 2.83 x 14.7 = 41.6 absolute PSI.
Since most people talk about “boost” we want to know how much pressure above standard atmospheric pressure so we subtract back out 14.7.
41.6 - 14.7 = 26.9 pounds of boost.

The standard v belt pulley on the blower is ~3.27”.
So I think a 2” pulley driving the blower would make around 10-11 lbs of boost on a 212.
__________________
History doesn't repeat but it rhymes Name a successful fiat currency in the last 5k years
Reply With Quote
  #6  
Old Yesterday, 10:37 AM
WIX51348 WIX51348 is offline
Junior Member
 
Join Date: Jul 2019
Location: Under CARB scrutiny
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I actually bought an AMR300 blower a few days ago. It was 212.50 with free shipping, so not too bad in terms of price. The AMR500 blowers are less expensive, but for go-kart engine purposes are probably too large. I have a predator 212cc I am in the process of building as well as a 170cc 4 valve SOHC engine on a Honda Grom that I am considering using it with. This is something I have wanted to do for a long time and I finally pulled the trigger on it. I can upload photos of the blower and the project as it shapes up. I've been through a number of past threads, mostly DIYGK.com threads, on forced induction and I've come to the conclusion that even if it isn't cost effective or easy, I just gotta try doing it for myself. The blower is supposed to arrive in late July, in a week or so, so I should have it before too long. I don't know of any completed attempts to use an AMR300 to supercharge one of our small engines, but there are a few running turbocharged engines out there, so I would have to imagine it's possible. I think I'm going to go simple on the outset with a high idle to keep the engine from bogging due to inlet vacuum and try to run about a half an atmosphere of boost. Again, I'm not looking for massive horsepower numbers or huge boost, just looking to build a cool supercharged engine and learn a thing or two in the process. If it doesn't work, oh well, but if it does I imagine it'd be a lot of fun. Cheers.
Reply With Quote
  #7  
Old Today, 06:16 AM
ezcome-ezgo's Avatar
ezcome-ezgo ezcome-ezgo is offline
G'me sumthin to write on
 
Join Date: Aug 2015
Location: Atlanta, GA
Posts: 2,990
Thanks: 2,450
Thanked 992 Times in 795 Posts
Default

What are the dimensions of these things?
__________________
My name is Sylvester McMonkey McBean. I will make a decontamination.
Reply With Quote
  #8  
Old Today, 08:26 AM
JTSpeedDemon's Avatar
JTSpeedDemon JTSpeedDemon is online now
Currently flathead-crazed
 
Join Date: Jan 2019
Location: Texas
Posts: 1,625
Thanks: 342
Thanked 179 Times in 166 Posts
Default

With some welding, just curious, would it be possible to change it to chain drive instead of belt drive?
Just wonderin'.
__________________
Local Bird Engineering Nut
Reply With Quote
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 01:07 PM.