cuisinartvette wrote: ↑Wed Nov 14, 2018 10:04 am
Used to be popular in the TPI days, never heard of SLP using it on Camaros?
Seems like a lot of work/$ for a small improvement but some pieces you just cant port so you either pony up or dont.
Trying to picture some guy pumping cement through any manifold...lol what a mess .
It was in their literature and was confirmed to me by their (then) guy Chuck Jencks.
For display EH shows the abrasive medium being pumped out on the table but when they're actually 'honing' it's a closed loop process.
From the videos I've seen long ago I have a big problem with Extrude Hone. They do not take the time to block off all the other ports and flow all at once.
Imagine blocking off all but the one port you are working on so that you can continue to flow the abrasive material through only that one until you can pass a measured quantity within a specified time.
THEN move on to the next port and repeat.
Thus getting nearly the exact same 'flow' from each port.
In theory this should make measureable gains both on the Dyno and on the street. The biggest drawback is the substantial increase in machine time which is going to drive up expense.
Extrude Hone was developed for finishing jet engine components. Been there, done that. No way the process will open delightful paths to new found horsepower. It will not open area of a port or improve it.
Sparksalot wrote: ↑Fri Nov 16, 2018 4:06 am
Extrude Hone was developed for finishing jet engine components. Been there, done that. No way the process will open delightful paths to new found horsepower. It will not open area of a port or improve it.
It most certainly can do far more than honing or polishing. If they keep pumping it through long enough it will make holes. I had more than a millimeter taken out of my Infiniti motors upper and lower runners. It also knife edged the dual intake port dividers.
In terms of the Intake side of things unfortunately this process will not give you the port area where you may truly need it, so as such other then when called upon to rework a straight shot type off runner all you get is a narrowed up power band!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
mag2555 wrote: ↑Fri Nov 16, 2018 8:38 am
In terms of the Intake side of things unfortunately this process will not give you the port area where you may truly need it, so as such other then when called upon to rework a straight shot type off runner all you get is a narrowed up power band!
You make a valid point but think about what happens inside the most restrictive points within a casting during this process. The pressure builds up and forces the putty to work harder in the smallest areas.. thereby relieving some of the largest internal restrictions that cannot be reached via grinder.
So when shape takes a backseat to simply having enough CSA in too fast areas within the casting this stuff plain works to promote more airflow. Which is why the fast guys are using it on cast iron manifolds. Plus those are dry environments where nobody gives a damn about fuel wetting and restrictive CSA is the biggest power killer. This stuff works for many big name shops and corporations so just because Joe racer didn't see 40 horsepower gains shouldn't even come close to discrediting it's merit.
