Topic: What's going on with Randy's CAr today

[Dave@DDMworks]

Well for those that guessed ported head 

some more pics of the install:







Stock Head Flow numbers -

Intake
.100 - 82.64
.200 - 164.35
.300 - 215.00
.400 - 244.50
.500 - 251.80

Exhaust
.100 - 45.28
.200 - 109.47
.300 - 138.39
.400 - 143.64

DDM Head
Intake
.100 - 82.64
.200 - 164.40
.300 - 219.00
.400 - 258.00
.500 - 268.00

Exhaust
.100 - 71.60
.200 - 139.00
.300 - 160.13
.400 - 168.53
.500 - 171.54



Also some important things we learned during the testing of the 3 different heads that we did for this.
The 2 other heads had 1mm larger valves in them, which is even larger than the supertech's that people have installed, and we found that the valve is not the restriction in the head, the port is the limiting factor. So larger valves are not buying you any airflow. The head that went on Randy's car had the best flow all the way around with stock sized valves, we are limited by the intake manifold and exhaust manifold at this point and are looking into where those restrictions are also.

We need to get some more tuning on the head and will post up some dyno numbers once done,

Dave

[GXPinKC]

Only the best, Dave and all the good guys at DDMWorks!  Very Sweet Indeed!  Great shots!!! 

[Critterman]

Let me know when it is ready for testing

[DeepBlueGXP]

How come you're not doing the cams at the same time?

[Arabas]

Nice work DDM!! i suppose this is only for the 2.4 right?

[SKY888]

Also some important things we learned during the testing of the 3 different heads that we did for this.
The 2 other heads had 1mm larger valves in them, which is even larger than the supertech's that people have installed, and we found that the valve is not the restriction in the head, the port is the limiting factor. So larger valves are not buying you any airflow. The head that went on Randy's car had the best flow all the way around with stock sized valves, we are limited by the intake manifold and exhaust manifold at this point and are looking into where those restrictions are also.



Dave

Dave, good find!


should we also assume that these statements also apply on an LNF engine?

[spicy3480]

Very nice!!!  Cam next please!!!!

[Dave@DDMworks]

Dave, good find!


should we also assume that these statements also apply on an LNF engine?

I would assume so also, but we are having them take a look at the 2.0L head also to see where the restriction is on the intake side. We will also have pricing on the head packages in a couple days.

Also we found that there are ways to port the head that make it flow less then stock, so if you are getting head work done, make sure it is done on a flow bench!

Dave

[kennysabarese]

I'm pretty sure I remember some folks on the BB saying they have done head work and there wasn't much of an improvement. The Ecotec build book has some info about it as well.

[SKY888]

I would assume so also, but we are having them take a look at the 2.0L head also to see where the restriction is on the intake side. We will also have pricing on the head packages in a couple days.

Also we found that there are ways to port the head that make it flow less then stock, so if you are getting head work done, make sure it is done on a flow bench!

Dave

yes Dave, flow bench is a neccesity with head work...

will be posting flow bench info, once my head is done......

[Dave@DDMworks]

I'm pretty sure I remember some folks on the BB saying they have done head work and there wasn't much of an improvement. The Ecotec build book has some info about it as well.

There is definitely an improvement with the head, but I will say that the first cylinders that were done decreased flow numbers on the flow bench. I would love to see what some other people are getting on ported heads, as we had a total of 4 different heads done to come up with the one that worked the best. We will see what the LNF head does, but by looking at it and some dimensions on it, I would think it is going to respond very similar to the LE5 head, in that the port area is going to be the limiting factor for flow on the head, bigger valves are not going to buy any flow, and that normal porting practices will lose power. We will see though.

Dave

[Helios]

So am I going to be able to get these with my Stage 3 upgrade at the mod meet? Please, please, pretty please? With sugar on top?   BTW, my wallet hates you!   If not, it's no big deal. I do want my upgrade though.

[SKY888]

There is definitely an improvement with the head, but I will say that the first cylinders that were done decreased flow numbers on the flow bench. I would love to see what some other people are getting on ported heads, as we had a total of 4 different heads done to come up with the one that worked the best. We will see what the LNF head does, but by looking at it and some dimensions on it, I would think it is going to respond very similar to the LE5 head, in that the port area is going to be the limiting factor for flow on the head, bigger valves are not going to buy any flow, and that normal porting practices will lose power. We will see though.

Dave

Dave these are the numbers of joshmass, who had SMG conduct a MILD port on his LNF head.
SMG will also be porting the head of my engine in the near future:

Exhaust
.050 = 37.2 > 37.7
.100 = 72.1 > 80.0
.150 = 105.3 > 111.5
.200 = 131.7 > 138.5
.250 = 150.1 > 168.6
.300 = 158.0 > 183.7
.350 = 161.3 > 188.5
.400 = 164.5 > 193.1
.450 = 167.6 > 197.7
.500 = 169.7 > 202.1

Intake:
.050 = 51.9 > 52.6
.100 = 82.1 > 85.2
.150 = 113.2 > 117.6
.200 = 139.8 > 148.7
.250 = 160.1 > 177.3
.300 = 170.3 > 195.0
.350 = 174.2 > 216.0
.400 = 175.2 > 219.9
.450 = 176.1 > 223.8
.500 = 177.1 > 225.8

[Yogi]

Nice work, Dave!  Thanks for sharing!

Was the porting done by hand or CNC?   

[Dave@DDMworks]

Nice work, Dave!  Thanks for sharing!

Was the porting done by hand or CNC?   

All of the work was done by hand.

Dave

[Dave@DDMworks]

Dave these are the numbers of joshmass, who had SMG conduct a MILD port on his LNF head.
SMG will also be porting the head of my engine in the near future:

Exhaust
.050 = 37.2 > 37.7
.100 = 72.1 > 80.0
.150 = 105.3 > 111.5
.200 = 131.7 > 138.5
.250 = 150.1 > 168.6
.300 = 158.0 > 183.7
.350 = 161.3 > 188.5
.400 = 164.5 > 193.1
.450 = 167.6 > 197.7
.500 = 169.7 > 202.1

Intake:
.050 = 51.9 > 52.6
.100 = 82.1 > 85.2
.150 = 113.2 > 117.6
.200 = 139.8 > 148.7
.250 = 160.1 > 177.3
.300 = 170.3 > 195.0
.350 = 174.2 > 216.0
.400 = 175.2 > 219.9
.450 = 176.1 > 223.8
.500 = 177.1 > 225.8

I am guessing that the first number is stock and the second is after porting? Do you know what kind of flow bench was used and what vacuum?

Dave

[Yogi]

All of the work was done by hand.

Dave

Thanks, Dave! 

[SKY888]

I am guessing that the first number is stock and the second is after porting? Do you know what kind of flow bench was used and what vacuum?

Dave

yes dave, you are correct.

I believe its a JKM flow bench with 28" vacuum.....

[Helios]

Let me know when it is ready for testing

I know something you don't know. Hahahaha!