Modified Blown Fuel 100cc
Posted: Sat Jul 27, 2013 7:42 pm
Ok here are some pics and details from our build over the past few months. We really wanted to get hold of an old CB 100 but due to the expense and lack of, we decided to go with a CRF100F - a four stroke 100cc single. My dad has had some fast two strokes over the years but we thought a blown single four stroke on fuel would be more fun and LOUDER.... If nothing else we will make some noise.
Heres a quick wrap of the last few months
Day One - The stocker - what a rocket
Spacers for forks to reduce travel.
Nothing like a good workshop with every thing you need, need a bolt?
Remove rear shock and add clip ons
Weld rear struts in
Blower drive pulley - mounted to stock fly wheel. All done except grooves for belt. We will run outrigger bearing supported by cage.
Blower pulley next, as we only has a 100cc bike and a 300cc blower we only need to spin it at 1/3 rd engine speed to get one atmosphere to start with. So the pulley on the blower in very small, then of course you run into the problem of what belt can go around such a small diameter without destroying the belt.
Next mounting the blower, we are using a a Aisin supercharger, roots type, off a Subara only available in Japan
We got a turbo waste gate given to us from Gavin Spann, so we will modify this to use a blow off valve for the blower.
Grooves machined in pulleys, took a few hours to machine tool to cut 40 degrees grooves. All worked a treat. Belts just arrived, and new tacho.
You might also see we did the fuel calcs for how mush we need to run 3 miles flat out with a small percent of Nitro.
We are running an Amal Carb on the bike, the reason for this is my brother and I wanted to do this as my Dad ran Amals on his double engine triumph, and it seemed a cool thing to do. So we found this one on ebay off a 500cc landspeed bike, that ad read only used for 50 miles flat out.! Dad ran GPs but out of our price range
We have a remote fuel bowl, this way not mucking around with float height etc, we will just move the whole bowl up and down. This one was built to connect directly to the carby so we need to change connection.
So there is the last few months in a few shots, does not look like much when you write it up like this, but there is just a bunch of stuff that takes time, all the setting up and getting ready. Thanks to internetscooter for sharing how to get pics up from facebook.
Heres a quick wrap of the last few months
Day One - The stocker - what a rocket
Spacers for forks to reduce travel.
Nothing like a good workshop with every thing you need, need a bolt?
Remove rear shock and add clip ons
Weld rear struts in
Blower drive pulley - mounted to stock fly wheel. All done except grooves for belt. We will run outrigger bearing supported by cage.
Blower pulley next, as we only has a 100cc bike and a 300cc blower we only need to spin it at 1/3 rd engine speed to get one atmosphere to start with. So the pulley on the blower in very small, then of course you run into the problem of what belt can go around such a small diameter without destroying the belt.
Next mounting the blower, we are using a a Aisin supercharger, roots type, off a Subara only available in Japan
We got a turbo waste gate given to us from Gavin Spann, so we will modify this to use a blow off valve for the blower.
Grooves machined in pulleys, took a few hours to machine tool to cut 40 degrees grooves. All worked a treat. Belts just arrived, and new tacho.
You might also see we did the fuel calcs for how mush we need to run 3 miles flat out with a small percent of Nitro.
We are running an Amal Carb on the bike, the reason for this is my brother and I wanted to do this as my Dad ran Amals on his double engine triumph, and it seemed a cool thing to do. So we found this one on ebay off a 500cc landspeed bike, that ad read only used for 50 miles flat out.! Dad ran GPs but out of our price range
We have a remote fuel bowl, this way not mucking around with float height etc, we will just move the whole bowl up and down. This one was built to connect directly to the carby so we need to change connection.
So there is the last few months in a few shots, does not look like much when you write it up like this, but there is just a bunch of stuff that takes time, all the setting up and getting ready. Thanks to internetscooter for sharing how to get pics up from facebook.