Supercharged CBR250 build

See cars and bikes being built for the salt

Moderator: DLRA

Post Reply
User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Supercharged CBR250 build

Post by gennyshovel » Sat Jul 02, 2011 1:48 pm

As mentioned in the 2008 build diary, work has started on fitting an Aisin AMR300 supercharger to a MC19 Honda cbr250r engine with the goal of finally obtaining a 125 licence on this bike,
The frame is a raked honda VT250 one, with the cbr swingarm, forks and wheels fitted.
Image

Image

Yeah, the blower shaft will be supported, as will the crank one, with oil fed phosphor bronze bushes with seals either end.
To be continued,,,,,
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

User avatar
RGV
Posts: 661
Joined: Sun Feb 06, 2011 9:17 pm
Location: Adelaide Hills

Re: Supercharged CBR250 build

Post by RGV » Sat Jul 02, 2011 4:21 pm

Ive had a similar idea myself but have decided to stick with the 2 smoker.

Im sure it will be a real head turner. 4 X straight out pipes i hope 8)

Good luck with it Tiny, should be an easy build after the postie bike. (maybe)

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

User avatar
Dr Goggles
Posts: 1303
Joined: Tue Jul 05, 2005 11:23 pm
Location: Right behind you Chief !

Re: Supercharged CBR250 build

Post by Dr Goggles » Sat Jul 02, 2011 5:11 pm

Criminy!

Sooooooooooo,now I've got a better idea of what you were talking about last weekend....you're a greedy man for pain Tfer. :wink:
...few understand what I'm trying to do , but they vastly outnumber those who understand why..

User avatar
boyracer
Posts: 84
Joined: Mon Jan 14, 2008 6:08 pm
Location: adelaide

Re: Supercharged CBR250 build

Post by boyracer » Sat Jul 02, 2011 6:06 pm

I read a blog a while ago about some local guys that built a turbocharged and fuel injected cbr250 because they could. Might be of some use to you.

http://www.feralinjection.com/cbr.html
If its got b**bs or wheels its bound to be trouble!

Stayt`ie
Posts: 910
Joined: Fri May 13, 2005 11:47 pm
Location: Mackay

Re: Supercharged CBR250 build

Post by Stayt`ie » Sat Jul 02, 2011 6:45 pm

soooooooo the exhaust pipe is actually the intake :wink: , your a confused man Tiny, :lol: :lol:
First Australian to ride a motorcycle over 200mph at Bonneville,,,

User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Re: Supercharged CBR250 build

Post by gennyshovel » Sat Jul 02, 2011 7:10 pm

Stayt`ie wrote:soooooooo the exhaust pipe is actually the intake :wink: , your a confused man Tiny, :lol: :lol:
Perpetual motion,,my way ronnie :oops:
boyracer wrote:I read a blog a while ago about some local guys that built a turbocharged and fuel injected cbr250 because they could. Might be of some use to you.

http://www.feralinjection.com/cbr.html
Yep, I've seen that, and admire youths understanding of all 'lektronic
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

momec3
Posts: 720
Joined: Tue Mar 01, 2011 10:36 pm
Location: Cedar Grove Qld

Re: Supercharged CBR250 build

Post by momec3 » Mon Jul 04, 2011 6:06 pm

Two words Tiny, INTAKE TEMPRETURE, or are you running methanol.
Did lots of work in my former job on measuring intake temp on blown things trying to run petrol. Horrible combination.
Or are you fitting an intercooler in there.
Will sound sick.
Chris
Chris

User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Re: Supercharged CBR250 build

Post by gennyshovel » Mon Jul 04, 2011 6:31 pm

momec3 wrote:Two words Tiny, INTAKE TEMPRETURE, or are you running methanol.
Did lots of work in my former job on measuring intake temp on blown things trying to run petrol. Horrible combination.
Or are you fitting an intercooler in there.
Will sound sick.
Chris
Yeah Chris, methanol, the effective compression ratio with boost will be knocking on 17/1 (not allowing for the valve overlap, which is another hurdle to overcome down the track some) making alcohol a must.
Its a draw thru setup , and a steep learning curve for me, I'm not trying to do anything other than searching for an easy gain in HP, on a budget, and have fun in the process.
Who knows,,the plan might be a bad one ?
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

User avatar
internetscooter
Posts: 474
Joined: Mon Nov 20, 2006 12:18 pm
Location: Melbourne
Contact:

Re: Supercharged CBR250 build

Post by internetscooter » Mon Jul 04, 2011 8:23 pm

Hey - I'm keeping an eye on this build project tiny :D

I have a new IHI RHB31 Turbo Charger (Chinese copy) on the shelf earmarked for a conversion to supercharger...

You don't need to push it too hard first round because there's no records in that class... yet ;)
Paul
---
DLRA #647
89.664 mph (aiming for 100mph+)
Vespa Labs [url]http://www.vespalabs.org[/url]

User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Re: Supercharged CBR250 build

Post by gennyshovel » Fri Jul 08, 2011 7:28 pm

The intake took a small step towards it's final shape this week, the next job it to bend up some 16g mild steel to finish the bottom.( stainless would have been to difficult to form)
All I have to work with are the 2 end plates bolted up in their positions, measurements are critical, and distortion of the plates due to welding presents a problem, even though I bolted up some 3mm plate to them, still lots of welding to go yet.
Image

Image

Image
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

momec3
Posts: 720
Joined: Tue Mar 01, 2011 10:36 pm
Location: Cedar Grove Qld

Re: Supercharged CBR250 build

Post by momec3 » Fri Jul 08, 2011 8:33 pm

OK smart bum, :) how did you form that? Looks like a factory piece.

Chris
Chris

User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Re: Supercharged CBR250 build

Post by gennyshovel » Fri Jul 08, 2011 9:32 pm

momec3 wrote:OK smart bum, :) how did you form that? Looks like a factory piece.

Chris
Basic tools like these Chris

Image

And a lot of patience and time to reflect while sitting on the most important tool I have,,,a milk crate
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

momec3
Posts: 720
Joined: Tue Mar 01, 2011 10:36 pm
Location: Cedar Grove Qld

Re: Supercharged CBR250 build

Post by momec3 » Fri Jul 08, 2011 9:42 pm

Well done

Chris
Chris

User avatar
RGV
Posts: 661
Joined: Sun Feb 06, 2011 9:17 pm
Location: Adelaide Hills

Re: Supercharged CBR250 build

Post by RGV » Sat Jul 09, 2011 11:04 am

The person that can graft a R6 head and barrel onto a postie bike can do almost anything im thinking.

I take my hat off to you Tiny and look froward to you posts.

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

User avatar
gennyshovel
Posts: 823
Joined: Tue Mar 29, 2005 10:10 am
Location: Broken Hill

Re: Supercharged CBR250 build

Post by gennyshovel » Sun Jul 24, 2011 9:33 pm

Progress is slow,,but steady in the creation station.
The plenum is almost ready, welding complete, & its in the machine shop getting the faces machined flat.

Image

Ive also finished the 2 support bushes for the upper and lower drive shafts.

Image

one goes here

Image
Image

Then,,,,

Image

I need to knock up a blow off valve next, I'll experiment with some old valves once Iv'e checked what pressure one can hold, then make a 90 degree bizzo with an adjustable valve spring setup,,,maybe ?
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

Post Reply