DWMS RACING CB550F SUPER REVERSE PORT! NEW ENGINE COLORS AND PHOTOS!
- Thread starter joeyputt
- Start date
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Brother 50gary the gooseneck looks long in the photo but it is actually the same length as stock, it just looks longer because all of the factory boxed stamped metal is not there. Running the bike with the neck in the stock location and with stock rake I have several inches of clearance between the tire and velocity stack.
In the photo below you can see from the front frame bars the photo was taken at a slight rearward angle so there is actually more room than what it shows and the engine will sit higher as well as the front end a little more forward.
Brother IndieSol it will not be long now before you get to see her fire up and run! I have been waiting until after the first of the year to put a lot of time into her and now that I have my rims and suspension here the frame build will not take long at all! It will take me awhile to get everything engraved and polished and the seat I have planned will take me a couple of weeks to complete but you will hear her run soon!
Brother 50gary the gooseneck looks long in the photo but it is actually the same length as stock, it just looks longer because all of the factory boxed stamped metal is not there. Running the bike with the neck in the stock location and with stock rake I have several inches of clearance between the tire and velocity stack.
In the photo below you can see from the front frame bars the photo was taken at a slight rearward angle so there is actually more room than what it shows and the engine will sit higher as well as the front end a little more forward.
Brother IndieSol it will not be long now before you get to see her fire up and run! I have been waiting until after the first of the year to put a lot of time into her and now that I have my rims and suspension here the frame build will not take long at all! It will take me awhile to get everything engraved and polished and the seat I have planned will take me a couple of weeks to complete but you will hear her run soon!
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Did I miss the post where you worked out how you would get the cam re-profiled to change intakes into exhaust etc.?
Presumably the intake cams will be ground into exhaust profiles and the exhaust will be built up with weld at the new phasing. Or did you come up with a different approach?
Did I miss the post where you worked out how you would get the cam re-profiled to change intakes into exhaust etc.?
Presumably the intake cams will be ground into exhaust profiles and the exhaust will be built up with weld at the new phasing. Or did you come up with a different approach?
jay_kent
1979 cb650
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Somehow I get the feeling that this won't be a sculpture.
I can't wait to see how this cam comes out. Like the rest of us who are intersted in mechanical things, seeing something new and learning something new is always exciting.
That downtube rebuild looks awesome.
Somehow I get the feeling that this won't be a sculpture.
I can't wait to see how this cam comes out. Like the rest of us who are intersted in mechanical things, seeing something new and learning something new is always exciting.
That downtube rebuild looks awesome.
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Brothers I have not posted any of the internal engine information or photos because I have not completed it yet, the cam is ready to go as soon as I polish it but I still have to finish the work on the head and I also have to do some work to the rocker arms.
I want to get the frame built so that I can get the measurements for everything else I need to build for the bike so I just set the head and rocker box on the engine so that I could do the frame.
It is definately going to be a running and rideable bike but I am trying to be a little creative throughout the build so I like the sculpture referance. If I can keep putting time into her like I have been lately you will be able to see her run in a few weeks but it will take me a lot longer to finish all of the engraving, painting, and polishing I want to do and the seat alone will probably take me a couple of weeks of spare time.
Brothers I have not posted any of the internal engine information or photos because I have not completed it yet, the cam is ready to go as soon as I polish it but I still have to finish the work on the head and I also have to do some work to the rocker arms.
I want to get the frame built so that I can get the measurements for everything else I need to build for the bike so I just set the head and rocker box on the engine so that I could do the frame.
It is definately going to be a running and rideable bike but I am trying to be a little creative throughout the build so I like the sculpture referance. If I can keep putting time into her like I have been lately you will be able to see her run in a few weeks but it will take me a lot longer to finish all of the engraving, painting, and polishing I want to do and the seat alone will probably take me a couple of weeks of spare time.
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Brother crazypj we have been regrinding our own race cams here for years. I am doing all of the work for this bike myself that is why I built the header, intake, etc. I am doing all of the internal engine work myself as well.
One of my main goals on this bike is to build everything myself by hand with no expensive specialty tools, computerized models, cnc equipment, etc. to help show what a home builder is capable of on a budget and with the average tools most people have and can afford.
crazypj said:
Brother crazypj we have been regrinding our own race cams here for years. I am doing all of the work for this bike myself that is why I built the header, intake, etc. I am doing all of the internal engine work myself as well.
One of my main goals on this bike is to build everything myself by hand with no expensive specialty tools, computerized models, cnc equipment, etc. to help show what a home builder is capable of on a budget and with the average tools most people have and can afford.
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Joey, Cams have to be ground to very tight tolerances. Small changes at the cam can make huge difference to the way a bike runs. On some of our race bikes we tried several different cams until we get the one that actually works best in that motor.
I know that this isn't a performance bike, so that isn't a major concern, but they still have to be pretty close
Joey, Cams have to be ground to very tight tolerances. Small changes at the cam can make huge difference to the way a bike runs. On some of our race bikes we tried several different cams until we get the one that actually works best in that motor.
I know that this isn't a performance bike, so that isn't a major concern, but they still have to be pretty close
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
I definately agree Brother Teazer, I have been cutting and testing my own race cams for over 15 years and very subtle changes to the cam make very large differences. I will also say that even two of the same engines may like different cams than each other and even further I like different cams for different racetracks.
I am however amazed at the prices that a lot of aftermarket atv and motorcycle cams are bringing in comparison to what automotive cams are available for. I feel a lot of people buy cams just for a few thousandths of extra lift, a strand of hair is roughly three thousandths thick.
A lot of race cams that are under lift rules at the racetrack now run a cupped profile on the opening side to launch the valve but still pass spec at lift when spun by hand. For lift on a street or playbike I would slightly cup the opening side on a stock cam before I spent $400 on an aftermarket cam.
The same goes for compression, I see people spending a lot of money on decking the heads and running high compression pistons because they do not know that most engines have a ramp on the intake lobe of the cam which keeps the intake valve slightly open and only allows the piston to build full compression through one third or less of its compression stroke, reconfiguring the ramp on a stock cam allows the piston to build compression full stroke. Some aftermarket race cams will already have this removed but you can reconfigure a stock cam and make a lot of compression without ever removing the head.
A lot of lift and compression can be gained from reworking a stock cam.
teazer said:
I definately agree Brother Teazer, I have been cutting and testing my own race cams for over 15 years and very subtle changes to the cam make very large differences. I will also say that even two of the same engines may like different cams than each other and even further I like different cams for different racetracks.
I am however amazed at the prices that a lot of aftermarket atv and motorcycle cams are bringing in comparison to what automotive cams are available for. I feel a lot of people buy cams just for a few thousandths of extra lift, a strand of hair is roughly three thousandths thick.
A lot of race cams that are under lift rules at the racetrack now run a cupped profile on the opening side to launch the valve but still pass spec at lift when spun by hand. For lift on a street or playbike I would slightly cup the opening side on a stock cam before I spent $400 on an aftermarket cam.
The same goes for compression, I see people spending a lot of money on decking the heads and running high compression pistons because they do not know that most engines have a ramp on the intake lobe of the cam which keeps the intake valve slightly open and only allows the piston to build full compression through one third or less of its compression stroke, reconfiguring the ramp on a stock cam allows the piston to build compression full stroke. Some aftermarket race cams will already have this removed but you can reconfigure a stock cam and make a lot of compression without ever removing the head.
A lot of lift and compression can be gained from reworking a stock cam.
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
This thread and site loves you too Brother IndieSol, I am impatient as well and really want to see her done but I also find myself slowing down sometimes as I am enjoying this build so much I do not want it to end!
IndieSol said:
This thread and site loves you too Brother IndieSol, I am impatient as well and really want to see her done but I also find myself slowing down sometimes as I am enjoying this build so much I do not want it to end!
Swagger
Putting boot to ass since 1967!
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
What you're describing Joey sounds more like cam lobe overlap, I'm not heard of the cupping you speak of. Do you have a link to any info on that?
Do you have a dedicated cam grinder or are you using some other method?
What you're describing Joey sounds more like cam lobe overlap, I'm not heard of the cupping you speak of. Do you have a link to any info on that?
Do you have a dedicated cam grinder or are you using some other method?
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Brother Swagger valve overlap is when the intake and exhaust valves are open at the same time during the transition from the exhaust closing and the intake opening, valve overlap is an important factor for scavenging but is not what I am speaking of.
The ramp I am speaking of is on the closing side of most intake cam lobes, there is a small ramp that keeps the intake valve slightly open to relieve compression for easy starting. Most engines will only build compression with both valves fully closed for less than one third of the stroke with a stock cam however I have seen engines that actually only build compression for less than an inch of the top of the stroke. Most of your aftermarket hot cams will not have the ramp or it will be ground off.
Some atvs and single cylinders will also have a half moon on a pivot that works the same way instead of having it ground into the cam, with this setup the half moon keeps the valve slightly open during starting and then when the engine starts centifugal force kicks the half moon out and the engine runs at full compression. These systems are only there to help the engine spin over easier for starting.
You will not find many people who even know about this, and those that do know rarely talk about it. Almost every mechanic I have ever met has never heard of it and are naturally always skeptical about it when I tell them until I show them on an actual engine.
Swagger said:
Brother Swagger valve overlap is when the intake and exhaust valves are open at the same time during the transition from the exhaust closing and the intake opening, valve overlap is an important factor for scavenging but is not what I am speaking of.
The ramp I am speaking of is on the closing side of most intake cam lobes, there is a small ramp that keeps the intake valve slightly open to relieve compression for easy starting. Most engines will only build compression with both valves fully closed for less than one third of the stroke with a stock cam however I have seen engines that actually only build compression for less than an inch of the top of the stroke. Most of your aftermarket hot cams will not have the ramp or it will be ground off.
Some atvs and single cylinders will also have a half moon on a pivot that works the same way instead of having it ground into the cam, with this setup the half moon keeps the valve slightly open during starting and then when the engine starts centifugal force kicks the half moon out and the engine runs at full compression. These systems are only there to help the engine spin over easier for starting.
You will not find many people who even know about this, and those that do know rarely talk about it. Almost every mechanic I have ever met has never heard of it and are naturally always skeptical about it when I tell them until I show them on an actual engine.
Swagger
Putting boot to ass since 1967!
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Not skeptical, but 99% of my cam experience is with aftermarket pieces so I will have to look at a few OE cams here for visual reference. Seems like you'd be disrupting flow by back charging the intake port (even a little) by having the valve 'cracked open' during part of the compression stroke. After all, that 'excess' compression has to go somewhere.....
How does that work? Is it just not enough back flow to mess with the intake charge velocity?
Not skeptical, but 99% of my cam experience is with aftermarket pieces so I will have to look at a few OE cams here for visual reference. Seems like you'd be disrupting flow by back charging the intake port (even a little) by having the valve 'cracked open' during part of the compression stroke. After all, that 'excess' compression has to go somewhere.....
How does that work? Is it just not enough back flow to mess with the intake charge velocity?
joeyputt
The green flag sets me free
Re: DWMS RACING CB550F SUPER REVERSE PORT! NEW PHOTO!
Brother Swagger you can not usually visually see it on the cam lobe, depending on the application sometimes you can feel it. The best way to read it is to use a dial indicator lift gauge on the end of the valve or rocker and spin the engine over. The intake valve is just barely open at this point, on some engines it will close at the beginning of the compression stroke then open again near the top before it finally closes again.
I will take a photo of a cam card and post it so you can see the readings.
Swagger said:
Brother Swagger you can not usually visually see it on the cam lobe, depending on the application sometimes you can feel it. The best way to read it is to use a dial indicator lift gauge on the end of the valve or rocker and spin the engine over. The intake valve is just barely open at this point, on some engines it will close at the beginning of the compression stroke then open again near the top before it finally closes again.
I will take a photo of a cam card and post it so you can see the readings.
