434/ 400 stroker update
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
434/ 400 stroker update
Currently we are waiting for an intake manifold.
Here are some specs for your Desk top Dyno people.
Cam is a Hyd. Roller:
Intake Exhaust
Valve Lift .579" .591"
Lobe lift .341 .348
Duration @ .050 216 224
Valve Timing Open Closes
Int. 0 BTDC 36 ABDC
Ex. 40 BBDC 4 ATDC
Lobe Seperation 108
http://www.tmeyerinc.com/351Caluminumheads.htm
The above link has the head flow numbers, we did a little unshrouding of the intake so our low lifts should be better.
4.030" bore / 4.250" stroke
Lets see what you guys get.
Here are some specs for your Desk top Dyno people.
Cam is a Hyd. Roller:
Intake Exhaust
Valve Lift .579" .591"
Lobe lift .341 .348
Duration @ .050 216 224
Valve Timing Open Closes
Int. 0 BTDC 36 ABDC
Ex. 40 BBDC 4 ATDC
Lobe Seperation 108
http://www.tmeyerinc.com/351Caluminumheads.htm
The above link has the head flow numbers, we did a little unshrouding of the intake so our low lifts should be better.
4.030" bore / 4.250" stroke
Lets see what you guys get.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Tim,
What are the seat-to-seat timing specs for that cam. I need to get the ramp rate.
Also are there any updates to the head flow as a result of the work around the valves?
What are the seat-to-seat timing specs for that cam. I need to get the ramp rate.
Also are there any updates to the head flow as a result of the work around the valves?
Last edited by danlee; Oct 6, 2005 at 08:14 PM.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
OK, this is what I came up with using DynoSim. It has a few more tools than DD2K.
The head flow that I used is what Tim published on his website for the CHI-3V heads. I know that he did some valve work on those heads, so the results could be better than what I simulate. Also the ramp rate on the cam is in question, but I used what DynoSim gave me.
The Torque @ 2000 RPM is 435 ft-lbs, and it peaks @ 495 ft-lbs @ 4000 RPM. The Peak Horsepower is 426@5000 RPM.
I know that these figures can be a lot higher with better head flow at low lift, and/or faster cam ramp rates.
If I use the CHI published head flow, I get:
Torque=429@2000 RPM and 532@4500 RPM, HP=513@5500 RPM.
Both simulations were with a single plane intake and a 750CFM carb. A Dual Plane intake will boost the Torque at 2000 RPM quite a bit.
The head flow that I used is what Tim published on his website for the CHI-3V heads. I know that he did some valve work on those heads, so the results could be better than what I simulate. Also the ramp rate on the cam is in question, but I used what DynoSim gave me.
The Torque @ 2000 RPM is 435 ft-lbs, and it peaks @ 495 ft-lbs @ 4000 RPM. The Peak Horsepower is 426@5000 RPM.
I know that these figures can be a lot higher with better head flow at low lift, and/or faster cam ramp rates.
If I use the CHI published head flow, I get:
Torque=429@2000 RPM and 532@4500 RPM, HP=513@5500 RPM.
Both simulations were with a single plane intake and a 750CFM carb. A Dual Plane intake will boost the Torque at 2000 RPM quite a bit.
Elder User
Joined: May 2002
Posts: 526
Likes: 0
From: Sin City, USA
Originally Posted by danlee
OK, this is what I came up with using DynoSim. It has a few more tools than DD2K.
The head flow that I used is what Tim published on his website for the CHI-3V heads. I know that he did some valve work on those heads, so the results could be better than what I simulate. Also the ramp rate on the cam is in question, but I used what DynoSim gave me.
The Torque @ 2000 RPM is 435 ft-lbs, and it peaks @ 495 ft-lbs @ 4000 RPM. The Peak Horsepower is 426@5000 RPM.
I know that these figures can be a lot higher with better head flow at low lift, and/or faster cam ramp rates.
If I use the CHI published head flow, I get:
Torque=429@2000 RPM and 532@4500 RPM, HP=513@5500 RPM.
Both simulations were with a single plane intake and a 750CFM carb. A Dual Plane intake will boost the Torque at 2000 RPM quite a bit.
The head flow that I used is what Tim published on his website for the CHI-3V heads. I know that he did some valve work on those heads, so the results could be better than what I simulate. Also the ramp rate on the cam is in question, but I used what DynoSim gave me.
The Torque @ 2000 RPM is 435 ft-lbs, and it peaks @ 495 ft-lbs @ 4000 RPM. The Peak Horsepower is 426@5000 RPM.
I know that these figures can be a lot higher with better head flow at low lift, and/or faster cam ramp rates.
If I use the CHI published head flow, I get:
Torque=429@2000 RPM and 532@4500 RPM, HP=513@5500 RPM.
Both simulations were with a single plane intake and a 750CFM carb. A Dual Plane intake will boost the Torque at 2000 RPM quite a bit.
Try that with an 850cfm carb. When we talked to Demon about my 408ci combo, they told us to use an 850. So, we had a 850 Street Demon built for it.
--J
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
With a 850 CFM carb, I get 439 ft-lbs torque@2000 RPM, and peak 495 ft-lbs torque@4000 RPM. The peak HP is 450@5500 RPM.
I am having a problem reproducing the previous numbers. Something else must have changed in the file. I will check later.
That cam is not that radical. If I were looking for big HP, then a bigger cam would help. As it is it will be a good low and mid range motor, especially with a dual plane intake.
I am having a problem reproducing the previous numbers. Something else must have changed in the file. I will check later.
That cam is not that radical. If I were looking for big HP, then a bigger cam would help. As it is it will be a good low and mid range motor, especially with a dual plane intake.
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Elder User
Joined: May 2002
Posts: 526
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From: Sin City, USA
Originally Posted by danlee
That cam is not that radical. If I were looking for big HP, then a bigger cam would help. As it is it will be a good low and mid range motor, especially with a dual plane intake.
Elder User
Joined: May 2002
Posts: 526
Likes: 0
From: Sin City, USA
Originally Posted by danlee
With a 850 CFM carb, I get 439 ft-lbs torque@2000 RPM, and peak 495 ft-lbs torque@4000 RPM. The peak HP is 450@5500 RPM.
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
Well guys here's the best I have so far. We are waiting for the intake manifold to arrive. I did not have another order for CHI, so I had to wait for it to be shipped with someone else's order. Sounds like it will be shipped Mon or Tue.
Next problem is we are closing the machine shop (temp.) for a few weeks. As some of you may know, we had a fire a few months ago. The roof comes off Mon. So I will be spending the time cleaning and answering the phone.
I will keep everyone up the best I can.
Junior User
Joined: Jun 2005
Posts: 68
Likes: 0
Danlee, I kept the cam down for a couple reasons. One is the power fell in the lower RPM band which will make it more reliable over the long haul. Also the torq band seem to be flat and carry over a wide range of rpm. Keep in mind this is going in a 3000lb car.
Gary
Gary
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
OH NOOOOOOOOOO!
I'm going to need parts Tim...especially the c rods...what do I need to do? My email is out so I cam only communicate through this site or phone. WIll be hunting on Monday. I'll try to call on Tuesday to get this going!!!
I'm going to need parts Tim...especially the c rods...what do I need to do? My email is out so I cam only communicate through this site or phone. WIll be hunting on Monday. I'll try to call on Tuesday to get this going!!!