Sounds great Jack.
Information is what this thread is all about.
It's a blessing to have someone with your experience to help provide input.
On track to calibrate the flowbench tomorrow.
Then we are going to flow some heads..
Establish baselines for Garrett's D Port as is as well as a baseline for the stock head which has simply been cleaned with stock valves lapped and sealed. The same treatment as the D Port.
Once the data has been collected I will be removing all of the epoxy from Garrett's D Port and cleaning it for reconstruction.
The stock will take a different direction.
I will be flow testing small changes (simply cleaning up the port casting for example) and valve grinds/mods. It will be retested after each modification. Everything will be shown.
This will not be a thread with me simply reporting numbers. Testing for both heads will include:
9 point flowball (turbulence & dead zones)
Performed at each "slice/half slice"
9 point velocity
Performed at each "slice/half slice"
Velocity at port side of valve
Clocked in 9 positions
Smoke tests
Used to indicate swirl.
Obviously CFMs as well.
The intention is to be intensive and extensive.
From mild to wild...
Members can see the numbers.
They can see how the tests are done.
They can decide what is worthwhile for themselves and their machines.
I invite input....
Additionally I will opening up the junk head (that gggGary was kind enough to donate for the cause) to see just how far it can go.
I will post those numbers as well.
My plan at the moment is to mold the port using that very opened up chamber utilizing clay (much easier to manipulate and change.
There are a number of port designs I will be looking at beyond the D Port. I will say that I expect the D Port design to be on the leaderboard. These big ports beg for the increased velocity this design brings to the table.There are other ways to try and achieve that same goal and I will be exploring them as well.
Garrett's head will be designed for a 700cc bike running a Shell #1 cam. There is some math used to match port design to specific engines and their use. I'll touch on it at the time if there is any interest. There are also "markers" that are targeted values we will be trying to match.
These values are widely recognized standards.
Much of what I know I have studied from Smokey Yunick (If you don't know, you don't know. If you do, you do) as well as David Vizard. Ditto from above. There are others but those two have been and by many are still considered mountaintop guys. Having someone here like Jack who truly gets it... that has spent innumerable hours studying, testing and modifying these specific heads is an incredible asset for this community. Furthermore, his willingness to share his knowledge in his Epic thread has been inspiring to myself as well as others. The gains he made are undeniable.. (remember, it's ALL about the PERCENTAGES)
The head he created for
@spungle received VERY high praise when driven. Seat of the pants I know.
But I always say,.. if your pants in the seat can't tell difference ... well....
That's where it matters isn't it?
Enough typing.
Work to get done so I can get this party started.