Aisin Amr300 roots blower

[Dead Roman]

Looking for one of these little guys. If anybody has one they are willing to part with let me know.

[maj]

see a few aisin superchargers over here on jap import cars
i think thats what Tiny is running on his 250
If you can't find any locally i know Aussie ebay has 2 amr 500's listed
and there were a couple of 300's in my area a few yrs back (i usually get a phone call asking to help fit them )
i can ask around and see if there still in good order 

[generatorshovel]

These guys have 'em (where I bought mine)
They occasionally put them on ebay, but best to deal direct to get a good blower, at a good price (my AMR 300 was AU$300)
They were fitted to Subaru Vivito mini vans in Japan and will spin to 11,000+ rpm (for a while)
Adelaide Japanese Imports Pty Ltd
Auto Parts Recyclers - Holden Hill, SA
19 Jacobsen Crs, Holden Hill SA 5088, Australia
Phone number(+61-08) 8369 1156

[Dead Roman]

I appreciate it guys. The AMr500 is too big for my 650cc application. Im just gonna be running a low boost setup on a yamaha xs650. May eventually bump it up to 750 but I think the 300 can handle it. Im more worried about saving space than having a blower that could handle 1000cc. also the guys on ebay are askin like 900 bux for a 500,that seems kinda nutty to me.

[Dead Roman]

see a few aisin superchargers over here on jap import cars
i think thats what Tiny is running on his 250
If you can't find any locally i know Aussie ebay has 2 amr 500's listed
and there were a couple of 300's in my area a few yrs back (i usually get a phone call asking to help fit them )
i can ask around and see if there still in good order

I woulds definately appreciate that. Rather buy from a racer than an importer.

[JimL]

No claims to expert knowledge on this, but a few I've had some involvement during kitting engines NOT designed for blowers.  Maybe some clues for your planning, I hope.
- 1000cc blower on 3000-3400cc engines.  Anything over 9psi was too much heat and detonaton at high rpm.  Rotors grow and hit the housing on a long pull.
- 1000cc blower on 1800cc engine was pretty good for street but could make enough pressure to hurt bearings and break crankshaft bolts because the engine was notcapable of that power level.
- 2000cc blower on 4300cc engine ran best with restrictor plate between throttle body and blower inlet.  No detonation problems.  Without restrictor, piston life was "first pull".  Best was about 8psi without blower air temp issues until restrictor used to control boost at highest blower speed.
- Well built 3700cc engine with low comp pistons, NASCAR heads, Chevy 2" Cariilo rods, ball bearing ball under each ARP head stud. 8 injectors (2 behind the throttle body).  Maxed at 13.5 psi because the blower belt only gave about 45 seconds at 15psi so we slowed it down.  This 2000cc blower is a pretty good match for that street engine.  400/400 power and torque and max engine speed 7800.

You may be in a similar situation, where the engine is not optimized for supercharging.  300cc blower on a 650cc at Bonneville may be spinning too hard.  That is a quick way to get the rotors to grow into the case because the heated compressed air doesnt evacuate well when blower speed is too high and you get up against port pressure from not enough cam, valve, and port.  I'd be tempted to use the 500, make some restrictor plates, and keep the blower speed off the top of the graph.  You will get all the boost your drive ratio can provide until you get toward the danger area of the map.  You can try different plates easily, but do it on the inlet side of the blower.

I am certain there are many, here, who know a lot more about blowers than I do.  This is just the results of about 8 years involvement in those kits.  In the end, slowing the blower down was always more tolerable for these stock engines, and that sounds like where you are going.  If I could supercharge my 650, I'd love to use an r410 but they are a lot more money than a Social Security check!

OK...here come the slingshots and bows & arrows!

[TheBaron]

Good info....The issues you bring up are quite valid about heating of the rotors,,,, "draw-through" (carb) systems run cooler than dry systems (port EFI) as the fuel cools and help seal the rotor to case clearances....

What were the drive ratios of the systems you referenced ? Matching the blower speed to engine rpm is the heart of getting things ballpark matched up ....

I am working on a 350cc motor / Aisin 300 setup.... and  will not r-e-a-l-y know what I need ratio wise till I actually run it at the altitude of the race venues....

[generatorshovel]

I found these links usefull when setting up the AMR300 on the 250/4

http://www.dragsource.com/index.php?navselect=calculators&calctoview=3#

http://www.csgnetwork.com/pulleybeltcalc.html

http://www.rbracing-rsr.com/compression.htm

http://performancetrends.com/Calculators/Supercharger-Boost-Calculator/Supercharger-Boost-Calculator.php

https://docs.google.com/spreadsheet/ccc?key=0Asevv5bL4hdbdHFWbWYtN0FzT2hLTkc3VHVZSHB5Q1E&hl=en#gid=0



The calcs worked out close to the mark during testing, but I'm relying on the cooling effect of methanol to get me 3 miles, 3 times  

[Dead Roman]

Thank you JimL. All of the information you gave will be very useful. However, this is not going to be an extremely high performance build. This bike will run on the street and probably do 5psi max. I am basically building a bike that will be reliable, but I want to be able to embarrass assholes on their 30k+ hardleys. If I was gonna run this at bonniville I would shoehorn the 500 in there for sure.

[JimL]

Ok, I guess I didnt pick up on the street only idea.

About the blower speeds, the real deal was Eatons map and where the heat starts overwhelming the effect of boost.  Some customers needed them slowed down for stock engines on marginal fuel and fairly high thermostat temps ( required for emissions and keeping the oil clean.)

Because the designs vary, you really have to go by the manufacturers graph.  Keep in mind, it was the smart guys doing the design and engineering decisions....I just helped on various small issues after it was about ready and got a little learning by osmosis!

[Dead Roman]

All good info!

[Dead Roman]

Anyone have any luck sourcing one of these? Im still watching.

[jverban]

you can buy them on www.amr300.com

[manta22]

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[SPARKY]

thanks Neil