Lets talk valve size - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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  #1  
Old 01-06-2014, 02:10 PM
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Lets talk valve size

So, I've been doing lots of thinking, and had a lot of discussions about airflow through the 6.0 heads lately, and ive heard lots of guys say immediately that bigger valves are needed. out of curiosity I measured a few valves and figured up the area of the valves, a few interesting observations...6.0's have more intake area than ANY of the other engines, 7.3's have identical sized intake and exhaust valves, as does 24v cummins, and duramax intake and exhaust valves were closer in size tha. 6.0/6.4...this is what I found:


6.0:

intake valve size:
intake valve area: 1.405 square inches (x2) = 2.810 square inches total

exhaust valve size:
exhaust valve area: .953 square inches, (x2) = 1.906 square inches total


7.3:

intake valve size : 1.675"
intake valve area: 2.201 sqaure inches total

exhaust valve size : 1.675
exhaust valve area: 2.201 square inches



Duramax:

intake valve size: 1.296
intake valve area: 1.318 square inches (x2) = 2.636 square inches total

exhaust valve size : 1.218"
exhaust valve area: 1.164 square inches (x2) = 2.328 square inches total



12v 5.9 cummins:

intake valve size: 1.770"
intake valve area : 2.459 square inches total

exhaust valve size: 1.654"
exhaust valve area: 2.147 square inches total


24v 5.9/6.7 cummins:

intake valve size: 1.298"
intake valve area: 1.322 square inches (x2) = 2.645 square inches total

exhaust valve size: 1.298"
exhaust valve area: 1.322 square inches (x2) = 2.645 square inches total





now, these are all just simple measurements, but it shows a few things, 6.0's have the most intake valve area of any of the common engines in the medium duty market (dont know about the 6.7 ford. ..and I forgot 6.4, but the intakes are the same size as 6.0...exhaust valves are 1.5mm bigger than 6.0, so it would be a small gain in exhaust valve area over 6.0). I wonder how much of a restriction the port on a 6.0 head is compared to the valves...im working with a port work professional to determine this, and see what can be done to maximize airflow. ive been a huge proponent that the 6.0 heads need improvement badly, and that its very difficult to use much larger valves because of the small bore size (3.740 iirc). it would appear that 6.0's have way more valve area than even the 7.3's...but obviously waaaay less displacement. I know for a fact that duramax intake ports are way bigger, my guess would be 20-40% bigger in volume than 6.0's...but the intake valve area is way smaller. I would love to know the engineers thoughts for their decision making process in determining valve size and whatnot. hopefully here very soon ill have flow numbers for stock 6.0 heads, and ill have a durmax head flowed just for curiosity. I also plan to 'CC' the port volume of a 6.0/6.4 and the duramax. a duramax (6.6 liter) has a much larger bore...4.065 iirc, so I wonder how much that has to do with port size vs valve size vs engine displacement vs intended use/rpm. anyway more flow data to follow, ill post up my results as I get them.
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Old 01-06-2014, 02:34 PM
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this is gonna be interesting. im folllowing for what you find
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Old 01-06-2014, 02:43 PM
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Sweet!! Props to you for the effort and data!!
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Old 01-06-2014, 02:45 PM
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very interesting info Jared
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Old 01-06-2014, 03:01 PM
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obviously there is a lot more to airflow than valve size, lift and duration obviously play huge roles (and I truely think that the hydrualic lifters in our motors are soaking up lots of lift and duration)
all the powerstroke diesels are hydrualic roller lifters (and from the early turbo/direct injection 7.3's all the way to the 6.4, they actually take the exact same part number lifter). the 12v and 5.9/6.7 24v cummins use solid flat tappet lifters, and duramax are solid roller lifters. ill try to measure cam and valve lift on the engines mentioned, possibly duration and port volume, but we'll see. I also plan on flowing the 6.0 heads with stock cam specs, and colt stage 1 and 2 specs, and different valve sizes to see what the data tells us we need to do to further improve airflow.

also, the 6.0, 6.4, 6.6 duramax, and the 5.9/6.7 24v cummins all use a 7mm valve stem (I think the new 6.7 ford is too, but not sure). the 7.3 and 5.9 12v are 8mm stems. small stems are better for airflow through the port and around the valve, its common in racing engines for the valve to neck down near the head of the valve ao as not to take up as much of the port volume.

Last edited by Gearhead2012; 01-06-2014 at 03:06 PM.
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Old 01-06-2014, 03:11 PM
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Old 01-06-2014, 03:15 PM
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This is gonna be good.
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Old 01-06-2014, 06:05 PM
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very good info.... I can see the whole hydraulic vs solid lifter topic being a conversation piece on this thread...
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Old 01-06-2014, 06:10 PM
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I wonder if there are solid roller lifters available somewhere for these trucks.

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Old 01-06-2014, 06:18 PM
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What exactly would be "optimal" lift? Compressing the valve springs to just before binding?

Also, on the whole displacement topic, by going with what you wrote, it would seem the 6.0 is the 305 Chevy of all the offerings. Not that extreme, but you get my point. It puts out power, just not as good at utilizing aftermarket performance parts as a 24v or dmax.
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