CR500 port work question
- motardcr500
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- Joined: January 21st, 2012, 10:33 pm
CR500 port work question
This was a Pro Circuit cylinder.
Note the differences in the exhaust port?
180 and 182 degrees.
http://www.oem-cycle.com/forum/download ... hp?id=2125
Anybody with any ideas why?
Why not split the difference and go 181 degrees across the port?
Note the differences in the exhaust port?
180 and 182 degrees.
http://www.oem-cycle.com/forum/download ... hp?id=2125
Anybody with any ideas why?
Why not split the difference and go 181 degrees across the port?
- Roostius_Maximus
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starts a little velocity shot, makes a difference without making the feel of port timiing
http://www.youtube.com/user/500bigbore
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
- motardcr500
- Posts: 41
- Joined: January 21st, 2012, 10:33 pm
A buddy of mine had the cylinder and when I saw ProCircuits mark I had to find out what they did.
In the least it needs to be re-sleeved.
We were comparing it to a Egore cylinder and a stock cylinder.
Egore's cylinder had a bit more work done then the PC but I'm less then impressed.
I do have paper tracings of the ports as well as recorded the port timing... which was all stock
In the least it needs to be re-sleeved.
We were comparing it to a Egore cylinder and a stock cylinder.
Egore's cylinder had a bit more work done then the PC but I'm less then impressed.
I do have paper tracings of the ports as well as recorded the port timing... which was all stock
- Roostius_Maximus
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I have that info too, but these is actually more accomplished below that. Gorr likes his epoxy work.
http://www.youtube.com/user/500bigbore
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
- motardcr500
- Posts: 41
- Joined: January 21st, 2012, 10:33 pm
- Roostius_Maximus
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- Joined: November 16th, 2007, 3:24 pm
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He's trying to pick up velocity and his idea at the port opening at the rear transfers is that the flow is pointed at the exhaust port but should cross the cylinder instead.
I know guys with it, heck Ive tried it too, they require less pilot jet but then again most good port work should. It's crisper but it doesn't make more torque, it doesn't make more hp, it smoothness out the low end.
I'm on the other end of the scale, I like to add 16-18ftlbs at 3800-4200 rpm, but carry that a few thousand rom higher and add hp. I don't hold much respect for his stuff.
I know guys with it, heck Ive tried it too, they require less pilot jet but then again most good port work should. It's crisper but it doesn't make more torque, it doesn't make more hp, it smoothness out the low end.
I'm on the other end of the scale, I like to add 16-18ftlbs at 3800-4200 rpm, but carry that a few thousand rom higher and add hp. I don't hold much respect for his stuff.
http://www.youtube.com/user/500bigbore
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
- motardcr500
- Posts: 41
- Joined: January 21st, 2012, 10:33 pm
- Roostius_Maximus
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- Joined: November 16th, 2007, 3:24 pm
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I don't like talking it up, but the '97-'01 250 engines I've been working on have been working frigging excellent. One guys has one of mine and a DeWayne Jones engine, his buddy a Gorr. They have tried sst, fatty, gnarly, pc pipes, vf 2,3, rad valves, the adjustable external exhaust valve parts, you name it. Got a real good handle on things but keep calling to say that mine pulls harder and smoother everywhere and uses way less fuel.
You already have cases, a head an cylinder. Should tweak on it.
You already have cases, a head an cylinder. Should tweak on it.
http://www.youtube.com/user/500bigbore
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
My CR500 Tech Reference... http://sdrv.ms/1a0CIiz
MRE Components... http://sdrv.ms/1bs2zhd
You still talk to Dewayne? Its been a while for me...Roostius_Maximus wrote:I don't like talking it up, but the '97-'01 250 engines I've been working on have been working frigging excellent. One guys has one of mine and a DeWayne Jones engine,.....
The CR500 is an acquired taste. If you don't like it, acquire some taste...
- motardcr500
- Posts: 41
- Joined: January 21st, 2012, 10:33 pm