Desktop Dyno 2000
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
I have a couple of questions about your setup.
Your Port Flow files should be at 28 inches H20. You Ford400 file gives 1.0 inch H20 pressure drop. This creates a large error.
Stock valve sizes are Intake is 2.04", and Exhaust is 1.65". You can increase the valve sizes to improve the flow, but the best results are at Intake = 2.15" and Exhaust = 1.65".
Your compression ratio is OK at 9.5:1, but how do you achieve this ratio. What piston combution chamber combination do you use?
You use a single Plane Intake manifold. These are available on E-Bay as used parts, but no manufacturers are making a Single Plane Intake now. The available Dual Plane Intakes provide better low end torque with only a small loss of peak Horsepower.
I would select the small cam, unless you are looking for low end torque and gas mileage.
Your Port Flow files should be at 28 inches H20. You Ford400 file gives 1.0 inch H20 pressure drop. This creates a large error.
Stock valve sizes are Intake is 2.04", and Exhaust is 1.65". You can increase the valve sizes to improve the flow, but the best results are at Intake = 2.15" and Exhaust = 1.65".
Your compression ratio is OK at 9.5:1, but how do you achieve this ratio. What piston combution chamber combination do you use?
You use a single Plane Intake manifold. These are available on E-Bay as used parts, but no manufacturers are making a Single Plane Intake now. The available Dual Plane Intakes provide better low end torque with only a small loss of peak Horsepower.
I would select the small cam, unless you are looking for low end torque and gas mileage.
Thread Starter
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Junior User
Joined: Mar 2003
Posts: 92
Likes: 0
Thanks for looking at it Danlee
I am using a single plane open plenum intake. It's a holley street dominator, supposedly I will receive better highway gas milage with this. My 9.5 compression is achived by flat top pistons and a decked head. You say use the bigger cam for better gas milage and low end torque? That is what I am looking for good gas milage and great torque. I just want to make sure that wasn't a typo.
Thanks for all the help I will post Pics when I put it back in
I am using a single plane open plenum intake. It's a holley street dominator, supposedly I will receive better highway gas milage with this. My 9.5 compression is achived by flat top pistons and a decked head. You say use the bigger cam for better gas milage and low end torque? That is what I am looking for good gas milage and great torque. I just want to make sure that wasn't a typo.
Thanks for all the help I will post Pics when I put it back in
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
You will get better gas mileage and better low end torque with a dual plane manifold. Throttle response will be better also. Use a single plane only if you are going to be operating at 4000+ rpm all the time.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Do not use the Big Cam (272/284) for mileage, that is a performance cam. The Small Cam (266/280) is good for street performance. The Ford400 Cam (260/268) is better for mileage.
You should also use a Dual Plane Manifold. An Edelbrock Performer #2171, or a Weiand 8010.
You should also use a Dual Plane Manifold. An Edelbrock Performer #2171, or a Weiand 8010.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
The overlap with the Ford400 cam is 44 degrees. The Dynamic Compression Ratio is 8.0:1. It should run good on 93 Octane fuel, but not regular. It produces 456 ft-lbs torque@2000 RPM and at 2500 RPM. It rolls off after that, but it is still 417 ft-lbs@4000 RPM. the peak HP is 322@4500 RPM. This is with a dual plane manifold.
With a single plane manifold it is: 420 ft-lbs Torque@2000, 439@3000, 439@3500, and 421@4000 RPM. the peak HP is 329@4500 RPM.
The Ford400 cam and a dual plane intake will give the best fuel mileage and low end torque.
The Spec number looks like a Comp Cams grind number, but it is not a catalog item.
With a single plane manifold it is: 420 ft-lbs Torque@2000, 439@3000, 439@3500, and 421@4000 RPM. the peak HP is 329@4500 RPM.
The Ford400 cam and a dual plane intake will give the best fuel mileage and low end torque.
The Spec number looks like a Comp Cams grind number, but it is not a catalog item.
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