Dave walks us through why we blend and what we blend after a head comes out of the CNC. Many believe the CNC just does everything, but that is not true!
Dave, ran across your video today. Haven't seen you since SAM, 25 years ago. Glad to see that you're doing good and still in the game. I have a pic of all of us around the SS Camaro sitting on my desk. Cheers brother! Josh M.
Hello. Thanks for these videos, not everyone wastes time teaching and explaining the why of things. They only show the beauty of the CNC's work, but all these details are not reported to the people. This week we are going to order the burrs that you have in stock, when they arrive in Spain, I will tag you on instagram. Best regards
Personally, I VERY much appreciate the blending. I recently expressed my disappointment after my client paid $4,500 for a pair of heads and 60% of the ports were untouched. 🤷♂️
I have experienced that too, shops really do not care, sometimes they get a little insecure then get mad at you for simply reading a sentence from an ASE book on the specs for your car to machine it. Told me I was making stuff up, when I have talked to a real engineer that designs optics and told more than I could ever ask for about that unit of measurement. In the end I called up and down the state, and concluded that people do not know and or get mad so I just did what ever with the engine too it seems to work for them anyways.
yeah I probably would tell you to pound sand if you told me what a book said to port the head too. Machining wise, that would depend on what part we were speaking about and if it actually mattered. Like, BMW states you can't use there heads after milling. Same with Nissan GTR. We have milled some heads many times with no adverse effects.
When I see a CNC port - I actually PREFER to see some spots left raw... it suggests their program isn't simply "hogging it TF out", but rather - has been programmed to only remove the bit of material necessary to create a good, high velocity airflow.. Regarding the bit of extra deburring work. In the machine shops I've worked in, this is called "benching" or "benchwork". Theoretically, the CNC operator is supposed to do the benching on the last part while the current part is being run in the CNC. In reality, the operator stands around, BS's with the other operators, or plays on his phone instead - leaving the benchwork undone. Nice to see you take pride in delivering a quality, finished product to your customers.
I agree, some are hogged out just so they don't have to blend it. We prefer to not make the port bigger than it needs to be to save us from doing work.
I would love to lock at your process. I have made programs for other industries that use probs to pick out casting moldes and run different parts of the program for them. For the debur you could do that in the machine! the question is then how are you staffed and the fixtures that you wether to should.
As always, great stuff. One question, it looks like the third port has a significant crack in the middle of the fin. Is this a junk head? What's the story there?
First and foremost, thank you for the content! Keep it up! On EJ s20 heads going on a hybrid motor, would +1mm valves and porting be recommended at the 4-450whp mark?
We don’t install oversized valves in a Subaru at all. You can make 1400whp on stock size valve. The +1 valve is only .004 smaller than the seat so you run into heat transfer issues and it doesn’t flow better till .350 lift. The highest lift you can possibly get is .420ish. So you lose more than you gain. Stock cams for up to 550whp. Stock size valve.
It is very eye opening just how sqewed these casts can be, unique like fingerprints. I have seen modern BMW engines being made and noticed that the sand is falling apart as they are pouring the liquid alloy. Why not add material to the port before CNC-ing it so they are a little more identical? I've seen 2-stroke guys add filler to really smooth out the curves.
not sure what you mean by filler. You cannot add aluminum to the heads and epoxy would just come out. You might be seeing them do that because it's a race head. If we did aftermarket castings then we can add material. That is what Trickflow and others do. Cast them small, so they all look uniform. That would be great!
Dave, ran across your video today. Haven't seen you since SAM, 25 years ago. Glad to see that you're doing good and still in the game. I have a pic of all of us around the SS Camaro sitting on my desk. Cheers brother! Josh M.
Love the extra attention to detail
It is the little details that count, and it doesn't take that long to do them. Good stuff.
Less competition going the extra mile
Hello.
Thanks for these videos, not everyone wastes time teaching and explaining the why of things.
They only show the beauty of the CNC's work, but all these details are not reported to the people.
This week we are going to order the burrs that you have in stock, when they arrive in Spain, I will tag you on instagram.
Best regards
Thanks for the kind words! Can’t wait to see what you do with our burrs!
Personally, I VERY much appreciate the blending. I recently expressed my disappointment after my client paid $4,500 for a pair of heads and 60% of the ports were untouched. 🤷♂️
Nice work!
U are the goat of porting videos
Thanks my dude
I have experienced that too, shops really do not care, sometimes they get a little insecure then get mad at you for simply reading a sentence from an ASE book on the specs for your car to machine it. Told me I was making stuff up, when I have talked to a real engineer that designs optics and told more than I could ever ask for about that unit of measurement. In the end I called up and down the state, and concluded that people do not know and or get mad so I just did what ever with the engine too it seems to work for them anyways.
yeah I probably would tell you to pound sand if you told me what a book said to port the head too. Machining wise, that would depend on what part we were speaking about and if it actually mattered. Like, BMW states you can't use there heads after milling. Same with Nissan GTR. We have milled some heads many times with no adverse effects.
When I see a CNC port - I actually PREFER to see some spots left raw... it suggests their program isn't simply "hogging it TF out", but rather - has been programmed to only remove the bit of material necessary to create a good, high velocity airflow..
Regarding the bit of extra deburring work. In the machine shops I've worked in, this is called "benching" or "benchwork". Theoretically, the CNC operator is supposed to do the benching on the last part while the current part is being run in the CNC. In reality, the operator stands around, BS's with the other operators, or plays on his phone instead - leaving the benchwork undone.
Nice to see you take pride in delivering a quality, finished product to your customers.
I agree, some are hogged out just so they don't have to blend it. We prefer to not make the port bigger than it needs to be to save us from doing work.
Love watching the video's and I have learned a lot about head porting from the video's and the Tuned in Podcast with HP Academy.
Glad you are getting something out of all this!
I would love to lock at your process. I have made programs for other industries that use probs to pick out casting moldes and run different parts of the program for them. For the debur you could do that in the machine! the question is then how are you staffed and the fixtures that you wether to should.
yeah the porting machines are not doing any deburing. Easy to do it by hand. You can check out Centroid 5 axis stuff online to see the processes.
As always, great stuff. One question, it looks like the third port has a significant crack in the middle of the fin. Is this a junk head? What's the story there?
that is not a crack. I have actually never seen a Honda B crack in the port. That is a casting line.
This is a good head for a customer.
Very Informative!!
First and foremost, thank you for the content! Keep it up! On EJ s20 heads going on a hybrid motor, would +1mm valves and porting be recommended at the 4-450whp mark?
We don’t install oversized valves in a Subaru at all. You can make 1400whp on stock size valve. The +1 valve is only .004 smaller than the seat so you run into heat transfer issues and it doesn’t flow better till .350 lift. The highest lift you can possibly get is .420ish. So you lose more than you gain.
Stock cams for up to 550whp. Stock size valve.
Thanks for the kind words. And also, get the chamber done to match the bore size.
@@headgames appreciate the help!
It is very eye opening just how sqewed these casts can be, unique like fingerprints. I have seen modern BMW engines being made and noticed that the sand is falling apart as they are pouring the liquid alloy.
Why not add material to the port before CNC-ing it so they are a little more identical? I've seen 2-stroke guys add filler to really smooth out the curves.
not sure what you mean by filler. You cannot add aluminum to the heads and epoxy would just come out. You might be seeing them do that because it's a race head. If we did aftermarket castings then we can add material. That is what Trickflow and others do. Cast them small, so they all look uniform. That would be great!
@@headgames How about Jb weld does that come lose?
great video, thank you!
can you do a video on cnc dimple ports vs standard cnc ports and flow test each?
ua-cam.com/video/KB_F76ZIs8k/v-deo.htmlfeature=shared
Im surprised when you said Hondas are a mixed bag. I thought they were known for having very low core shift and consistent heads
Some are great and some are not. More good than bad makes them a mixed bag in my book.
How can i send my heads off to you to get it done right