4-bolt 400
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
You can add about 20 lb-ft across the board for the roller cam & rockers as opposed to what the program uses for internal friction.
Gow, one thing I noticed, you are using the wrong lifter. The program says roller lifters but that setting is only used for all out racing cams. Use the solid lifter setting per the manual for the program. To use the program you must read and understand the book "Desktop Dynos" made for it. It is not enough to just have the book and refer to it. The program settings are very misleading.
Gow, one thing I noticed, you are using the wrong lifter. The program says roller lifters but that setting is only used for all out racing cams. Use the solid lifter setting per the manual for the program. To use the program you must read and understand the book "Desktop Dynos" made for it. It is not enough to just have the book and refer to it. The program settings are very misleading.
Last edited by Torque1st; Jun 21, 2005 at 06:21 PM.
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We are happy you have chosen the best source for Fords!
Enjoy FTE....and
JOIN CLUB FTE -SUPPORT THE FORUMS!
…..See you on the boards.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
gow589,
You have a later version of Desktop Dyno than I do, but that is not the reason that you are getting better results than I did.
You have 10:1 CR, where I used 9.0:1. This was supposed to be for a towing motor, not a racing motor.
You have a 850 CFM carb, where I used a 600 CFM carb.
I used a solid lifter cam profile for the ramp rates, since I can't specify ramp rates with my version.
Even when I change my specs to match yours, I don't get as much HP as your simulation does. I do get more torque, and that is what I would expect. Your simulation looks like a cam with longer duration is being used.
It may be due to the higher ramp rates.
Did you specify the head flow at 28 inches H2O?
You have a later version of Desktop Dyno than I do, but that is not the reason that you are getting better results than I did.
You have 10:1 CR, where I used 9.0:1. This was supposed to be for a towing motor, not a racing motor.
You have a 850 CFM carb, where I used a 600 CFM carb.
I used a solid lifter cam profile for the ramp rates, since I can't specify ramp rates with my version.
Even when I change my specs to match yours, I don't get as much HP as your simulation does. I do get more torque, and that is what I would expect. Your simulation looks like a cam with longer duration is being used.
It may be due to the higher ramp rates.
Did you specify the head flow at 28 inches H2O?
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
Originally Posted by good 'ol ford
ok so how did u do the 4-bolt still a little bit of a new be, did u just machine the other to holes into the block, how much do u plan on selling the kit for cuz im very interested thanx
Junior User
Joined: Jun 2005
Posts: 68
Likes: 0
Eric, Thanks for the input. I will be using roller's but I will look and see what the manual says. I have not had time time to sit down and read it but that is on my list. It looks like it has a lot of excelent info.
Danlee, I see where the presure drop is set at 1" but I don't see where to set the 28". Actually it's not going in a truck, but a 3K lb car. Where did you get your adapter plates? I would love to set up a down draft FI for this thing.
Hey Tim, hope you had a good Vacation.
I am removing a 351C with problems. I am interested in some of the problems I have been having with it but I will post in in another thread.
Thanks guys.
Gary
Danlee, I see where the presure drop is set at 1" but I don't see where to set the 28". Actually it's not going in a truck, but a 3K lb car. Where did you get your adapter plates? I would love to set up a down draft FI for this thing.
Hey Tim, hope you had a good Vacation.
I am removing a 351C with problems. I am interested in some of the problems I have been having with it but I will post in in another thread.
Thanks guys.
Gary
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
OK, with the pressure drop on the head flow set to 1 inch H2O and the other differences mentioned previously, I can reproduce your sim results.
However the CHI head flow is specified at 28 inches H2O pressure drop. This should be in the head flow table and should be set to 28 inches.
However the CHI head flow is specified at 28 inches H2O pressure drop. This should be in the head flow table and should be set to 28 inches.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Yes, most head flow is done at 28" pressure drop. The CHI head flow is at 28" pressure drop. If the pressure data is at some other pressure drop, then you need to adjust the simulator to that pressure drop.
Junior User
Joined: Jun 2005
Posts: 68
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That puts it closer to 475. Look at the original graph I had. The only difference between the 2 on that graph was the displacement. It was a stoked 400 vs a Cleveland. Notice the tq peaked at 500rpm less and the HP peaked at 1500 rpm less. Due to larger cubes and the effect of stroking.
A lot of guys like building up the smaller engines; 302's etc because they are "Race Engines". They are race engines because the races they ran were limited by size. Larger cubes makes all the sense in the world for a street engine. It allows me to get the power and torque up with lower rpms.
Gary
A lot of guys like building up the smaller engines; 302's etc because they are "Race Engines". They are race engines because the races they ran were limited by size. Larger cubes makes all the sense in the world for a street engine. It allows me to get the power and torque up with lower rpms.
Gary
Posting Guru
Joined: Mar 2003
Posts: 1,253
Likes: 2
From: spartanburg, SC
AEM EMS http://www.aempower.com/product_ems.asp
runs sequential
plugs in to stock 5.0 harness.
runs MAF or SD
very good tech support
runs sequential
plugs in to stock 5.0 harness.
runs MAF or SD
very good tech support
Senior User
Joined: Oct 2001
Posts: 184
Likes: 0
From: Goleta, CA
Hi all: Got a 77 M400 rebuilt to 300 hp with holly 600cfms and edelbrock performer. It all passes CA smog so far. Would like to have the advantages of EFI, but CA says no way. Any ideas as to how to get passed the smog test monster in CA. Even called the top dog and she would hear none of it. Didn't make a bit of differance that I could lower emissions and have my horse power too. No user adjustable parts was the criteria. EFI unit had to be engine specific and sealed (poted).
PWRPROD
PWRPROD