7.3 IDI head flow numbers
Posting Guru
Joined: Sep 2011
Posts: 1,523
Likes: 5
They are as follows...
All measured at 28" of water column
Intake
.100" - 69cfm
.200" - 128cfm
.300" - 175cfm
.400" - 184cfm
.500" - 187cfm
Exhaust
.100" - 45cfm
.200" - 82cfm
.300" - 119cfm
.400" - 147cfm
.500" - 163cfm
There you go, Ill let you guys draw your own conclusions before I weigh in...
All measured at 28" of water column
Intake
.100" - 69cfm
.200" - 128cfm
.300" - 175cfm
.400" - 184cfm
.500" - 187cfm
Exhaust
.100" - 45cfm
.200" - 82cfm
.300" - 119cfm
.400" - 147cfm
.500" - 163cfm
There you go, Ill let you guys draw your own conclusions before I weigh in...
Thread Starter
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Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
Here is stock 6.0 head flow specs... And thats a 4 valve head..
Intake port...
.000 Lift 0 CFM
.050 Lift 41.4 CFM
.100 Lift 80.4 CFM
.150 Lift 119.9 CFM
.200 Lift 145.4 CFM
.250 Lift 152.0 CFM
.300 Lift 154.8 CFM
.350 Lift 157.4 CFM
.400 Lift 159.3 CFM
.450 Lift 161.0 CFM
.500 Lift 161.9 CFM
.550 Lift 163.0 CFM
.600 Lift ----------
Exhaust Port....
.000 Lift 0 CFM
.050 Lift 37.0 CFM
.100 Lift 69.9 CFM
.150 Lift 93.2 CFM
.200 Lift 106.1 CFM
.250 Lift 111.2 CFM
.300 Lift 116.8 CFM
.350 Lift 119.2 CFM
.400 Lift 120.7 CFM
.450 Lift 121.3 CFM
.500 Lift 121.9 CFM
.550 Lift 122.3 CFM
.600 Lift 122.7 CFM
Tested at 28"
Stock head flow numbers - PowerStrokeNation : Ford Powerstroke Diesel Forum
Needless to say, I think 200+ CFM out of the intake is going to be a cakewalk...
The exhaust side is great after the valve is open halfway, but low lift flow is abysmal... And the funny part about it, is the stock cam doesnt even open the valve far enough to take advantage of the sweet spot in exhaust flow...
I am going to take one of my spare heads, and do some porting/valve angle testing... I will report on this thread when I find what I find...
The key to these heads is exploiting low lift flow, and a lot of that is accomplished by a good valve job
Intake port...
.000 Lift 0 CFM
.050 Lift 41.4 CFM
.100 Lift 80.4 CFM
.150 Lift 119.9 CFM
.200 Lift 145.4 CFM
.250 Lift 152.0 CFM
.300 Lift 154.8 CFM
.350 Lift 157.4 CFM
.400 Lift 159.3 CFM
.450 Lift 161.0 CFM
.500 Lift 161.9 CFM
.550 Lift 163.0 CFM
.600 Lift ----------
Exhaust Port....
.000 Lift 0 CFM
.050 Lift 37.0 CFM
.100 Lift 69.9 CFM
.150 Lift 93.2 CFM
.200 Lift 106.1 CFM
.250 Lift 111.2 CFM
.300 Lift 116.8 CFM
.350 Lift 119.2 CFM
.400 Lift 120.7 CFM
.450 Lift 121.3 CFM
.500 Lift 121.9 CFM
.550 Lift 122.3 CFM
.600 Lift 122.7 CFM
Tested at 28"
Stock head flow numbers - PowerStrokeNation : Ford Powerstroke Diesel Forum
Needless to say, I think 200+ CFM out of the intake is going to be a cakewalk...
The exhaust side is great after the valve is open halfway, but low lift flow is abysmal... And the funny part about it, is the stock cam doesnt even open the valve far enough to take advantage of the sweet spot in exhaust flow...
I am going to take one of my spare heads, and do some porting/valve angle testing... I will report on this thread when I find what I find...
The key to these heads is exploiting low lift flow, and a lot of that is accomplished by a good valve job
Posting Guru
Joined: Sep 2011
Posts: 1,523
Likes: 5
With the comparison of the 6.0 heads, that is really interesting info. Thanks for the numbers Justin. I look forward to seeing what you come up with after you work the heads over...
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Thread Starter
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Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
Basically, this is the way I see it...
The IDI, as I originally thought, has a decent flowing head for a diesel... It flows nearly on par with a 6.0/6.4 (which are horrible flowing heads for 4v's), and from what I researched, the IDI head flows better than the 7.3 PSD head...
The biggest thing with the IDI is getting low lift flow up... That is going to add more area under the curve and therefore more total flow... Not to mention magnify the effects an aftermarket cam has on these things (Hell the stock cam might benefit the most)... You have to remember, these engines dont flow all that much air... I would gladly sacrifice some high lift flow for low lift flow... I think thats why valve jobs and light pocket porting make such a difference on these engines...
Anyway, I still stand firm that these engines are limited by fuel as far as their power making capabilities are concerned... The only caveat besides HG's (easily solved by studs) is the rods, and those have to be good to 500whp (wont know until we get there)... I still am under the impression that we are only good for around 450 on fuel only, with a good setup. The stock N/A rods should be good for that... We shall see.
The IDI, as I originally thought, has a decent flowing head for a diesel... It flows nearly on par with a 6.0/6.4 (which are horrible flowing heads for 4v's), and from what I researched, the IDI head flows better than the 7.3 PSD head...
The biggest thing with the IDI is getting low lift flow up... That is going to add more area under the curve and therefore more total flow... Not to mention magnify the effects an aftermarket cam has on these things (Hell the stock cam might benefit the most)... You have to remember, these engines dont flow all that much air... I would gladly sacrifice some high lift flow for low lift flow... I think thats why valve jobs and light pocket porting make such a difference on these engines...
Anyway, I still stand firm that these engines are limited by fuel as far as their power making capabilities are concerned... The only caveat besides HG's (easily solved by studs) is the rods, and those have to be good to 500whp (wont know until we get there)... I still am under the impression that we are only good for around 450 on fuel only, with a good setup. The stock N/A rods should be good for that... We shall see.
New User
Joined: Oct 2012
Posts: 18
Likes: 5
From: Ohio
In my opinion I think the bottom end will handle 500hp no problem. As far as fuel goes a p pump or a v pump shouldn't be to hard to do on these engines. I think the only thing that has hurt the idis is people going to the electric trucks instead of staying with the mechanical ones. If I can build a 1000hp 3208 cat the 500hp idi should be easy. Racin I love what you are doing for the old tired iron that most people won't even look twice at compared to the new stock of trucks.
Lead Driver
Joined: Apr 2008
Posts: 6,940
Likes: 13
I dont need to spoil all the surprises, but that is something Racin and I have talked over quite alot, fabbing a V-pump on an IDI. Now with the 150/180cc DB4 im not sure if i want to go that route or not. But it shouldnt be hard at all to put one on there.
New User
Joined: Oct 2012
Posts: 18
Likes: 5
From: Ohio
The 3208 v pump from what I have seen needs the plungers out of a 3508 in it to put in order to get the fuel needed. If it was me doing it I would go with the 9 liter IH pump over the cat pump. I think it would be a better match. That's the same pump double over time uses in that truck.