Fantastic and through sir you make look easy. .but one thing for sure ..there is no one out there that does what you do .and takes the time to teach as well as you do ..very grateful ..
I had a 273 Mopar head (920 casting) flowed a number of years ago and a Ferrea F6246 intake valve outflowed the stock valve. But with a backcut, the stock valve flowed better up to .400" lift. We also took some Manley 1.81" BBM exhaust valves and cut them down to the stock 1.78" diameter and one of those was an overall winner. I had some other valves to try, but ran out of money. We never got to the valve job.
You can, the problem is I would need to figure out how to present it in an accurate manner. Not sure how to do that. 8pm on a Friday night and I am a bit tired.... thanks
Thank you for sharing. I been wondering how these measurements are taken for a while. I just the veiw of your pito disappear off screen when you were describing the holes in the end of the Pito stick.
Once you get your initial high readings in the nine high flow areas, you then port to try to even them out and reduce the area that flow to high. Do you check how it affects the lower speed area in the nine positions before your next cut? And generally how do the low speed areas change after the previous cut?
@servediocylinderheads two pcs of plexi glass hot glued into place. One to the head flush to the surface. Another hot glued horizontal to the other plexi glass. To seal to the bench. I'll make a video on it. Iam starting the 318 econo heads.
My Opinion....Think about it ? ......Nothing , Nothing happens until the Piston Moves ? SWEAPED VOLUMNE of 1 Cylinder , 387 cu in = 48.375 cu in @ 100% VE Mash the Peddle, ...Piston Speeds will Vary from Zero to 6,000 ft per sec, so Air Speeds VARY, go Up & Down with the RPM ? Air Speeds Vary with Valve Opening .001 to the Top Lift , Nothing is Static ? @ 28" you are Measuring at 1 Depression ! That 1 Port is Opening to a Moving Piston with a Strong Pull until BDC, it starts Back Up, all the Time Valve is Accellerating up CAM Ramp Open and Down Closing Cam Ramp , Shut ? OPEN...CLOSE...OPEN....CLOSE........Lots of Varible AIR SPEEDS ? Nothing Static..My Opinion
Ok, think of it this way. The bench is static. So the bench is taking a picture of what the flow is doing in that point in time at that lift. Your ability to interpret that info and then imagine the absolute mayhem that is occuring on an intake stroke is linked to your iq. Just my opinion. Thanks
I also disagree with your statement that nothing happens until the piston moves. On overlap the exhaust pulse can create about 120" of water vacuum which if timed correctly with the cam can give the intake charge a considerable yank when the intake starts opening. Think of it as a self driving air pump and not just an air pump. On a hemi you can probably see right down the intake and out the exhaust port while running.
@@servediocylinderheads 4 STROKEs - 720*.......When do you have Exhaust ? LAST Stroke !!....Crank on ,,a Engine, First thing Happens Intake--Compress-- Combust - -Power- Last -Exhaust !!! Nothing Happens, ..Nothing ,...Untill Piston MOVES DOWN-..... Creating a Depression-Vacumn as Intake Valve is Opening , ,Intake Stroke-(Air Starts Moving) , - Compression Stroke- Combust- Power Stroke- Exhaust! Stroke........ Overlap is way down the List, 720* -4 Strokes ! Where is Piston @ Max Overlap Valves are maybe Open 50*-60*??? ...Where is Piston @ Max Overlap??? @ TDC- Dead Stop- Min SQUISS ! You said Ex pulling 120" Vacumn out the Ex??. .. .Exhaust Valve Opens when Power Stroke Ends, near 75* ATDC !! Exhaust has been Open for 250* before Overlap , Ex Pressure at OPENING dosen't Stay the Same with Valve OPEN ??, getting Weaker and Weaker Ex Pressure every Degree !!!.....120 *..I Question ??. .How much Vacumn can it pull in Last 60*- ? So Piston has to Pull Down against 120" of Vacumn ??? Think Simple
One needs to also remember that head porters whose work found its way upon engines create test results to some degree. While flawless understanding of internal combustion minutia may still be guesswork, when flow bench work correlates with increased performance, it should be given due attention.
Fantastic and through sir you make look easy. .but one thing for sure ..there is no one out there that does what you do .and takes the time to teach as well as you do ..very grateful ..
Thank you!
This clarifies well the terminology and illustrates well the common spot you often go throught in your videos. Thank you Charles!
You are weclome.
Awesome video! I've been hoping to see something about the actual measuring process 👍
Glad you liked it.
I want to have a go at porting and flow testing one day. You are a good teacher.
Did you ever see the Bugs Bunny where he says, "You are a mental case, about time you came to see the doc."
All kidding aside, it is a real challenge to do well. Anyone can do bowl blends and gasket matches and that is fine.
I haven't seen that one but can understand the relevance to this hahaha.
@@grahamm3559 Doctor Jeckle n Hyde.
That's pretty neat. Thank you for taking the time to explain that fully. Your videos never disappoint kind sir.
Thank you
I had a 273 Mopar head (920 casting) flowed a number of years ago and a Ferrea F6246
intake valve outflowed the stock valve. But with a backcut, the stock valve flowed better up to .400" lift. We also took some Manley 1.81" BBM exhaust valves and cut them down to the stock 1.78" diameter and one of those was an overall winner. I had some other valves to try, but ran out of money. We never got to the valve job.
Valve testing can get a bit involved. Thanks
Looks like you need to be very careful to angle the tube the same way every time if you want meaningful measurements.
I didn't mention that but the angle does effect the air speed indicated. Thanks
Ha! I had seen the first one, and thought it was the one you were talking about. Great video Charlie!
Thanks for all the info and help!
See? Nice!
Great info! I was definitely curious how it was done
Glad you liked it.
Excellent video Charlie. Very informative. Maybe I could suggest a short video on how turbulence and noise affect your readings. Regards Greg
You can, the problem is I would need to figure out how to present it in an accurate manner. Not sure how to do that. 8pm on a Friday night and I am a bit tired.... thanks
Awesome. This is what most head porters don't even check.
No comment.
Thanks
Thank you for sharing. I been wondering how these measurements are taken for a while. I just the veiw of your pito disappear off screen when you were describing the holes in the end of the Pito stick.
Ok
Thanks for taking the time. It was perfect.
Glad you like it.
Charlie great information, thankyou Sir !
You're welcome.
Where did you get those pitot tubes sir? And thank you for sharing this video.
Google Dwyer Pitot tubes and they should pop right up. I don't quite remember where I bought them. Maybe Performance Trends. Thanks
Thanks for the video! Great job on the cutaways . How does DVs homemade pito and method compare to the professional equipment like you have?
I don't like his method and I told him so. Then I set his bench up with Pitots. He had them but they were brand new.
@@servediocylinderheads OK thank's. What is your goal on getting the air speeds the best for what you are working on?
@@dondotterer24 Make the port more efficient.
Once you get your initial high readings in the nine high flow areas, you then port to try to even them out and reduce the area that flow to high. Do you check how it affects the lower speed area in the nine positions before your next cut? And generally how do the low speed areas change after the previous cut?
All positions get retested. Thanks
Awesome thanks for sharing
Glad you like it. Thanks
Is the first intake port cut straight enough to glue a pc of plexiglass to it? You could hot glue a pc in place and do a transparent flow test!
You do have interesting ideas. There would be no way to seal it yo the bench. It is just a slice. Thanks
@servediocylinderheads two pcs of plexi glass hot glued into place. One to the head flush to the surface. Another hot glued horizontal to the other plexi glass. To seal to the bench.
I'll make a video on it. Iam starting the 318 econo heads.
@@approachingtarget.4503 That will be cool. Thanks!
What side of the port is fastest bore centre or wall?
Usually center of the cylinder.
Thank you sir.
You are welcome.
Thanks!
Thank you! Very appreciative.
Worse than your other videos! Wow! Just kidding! I will have to look it up. Thanks for sharing your knowledge!!!
I know, hurts to just think about!
So how do I do this a t home with a shop vac and two pitbulls haha
Pitots and a water manometer
My Opinion....Think about it ? ......Nothing , Nothing happens until the Piston Moves ? SWEAPED VOLUMNE of 1 Cylinder , 387 cu in = 48.375 cu in @ 100% VE
Mash the Peddle, ...Piston Speeds will Vary from Zero to 6,000 ft per sec, so Air Speeds VARY, go Up & Down with the RPM ?
Air Speeds Vary with Valve Opening .001 to the Top Lift , Nothing is Static ? @ 28" you are Measuring at 1 Depression !
That 1 Port is Opening to a Moving Piston with a Strong Pull until BDC, it starts Back Up,
all the Time Valve is Accellerating up CAM Ramp Open and Down Closing Cam Ramp , Shut ? OPEN...CLOSE...OPEN....CLOSE........Lots of Varible AIR SPEEDS ? Nothing Static..My Opinion
Ok, think of it this way. The bench is static. So the bench is taking a picture of what the flow is doing in that point in time at that lift. Your ability to interpret that info and then imagine the absolute mayhem that is occuring on an intake stroke is linked to your iq. Just my opinion. Thanks
I also disagree with your statement that nothing happens until the piston moves. On overlap the exhaust pulse can create about 120" of water vacuum which if timed correctly with the cam can give the intake charge a considerable yank when the intake starts opening. Think of it as a self driving air pump and not just an air pump. On a hemi you can probably see right down the intake and out the exhaust port while running.
@@servediocylinderheads 4 STROKEs - 720*.......When do you have Exhaust ? LAST Stroke !!....Crank on ,,a Engine, First thing Happens Intake--Compress-- Combust - -Power- Last -Exhaust !!!
Nothing Happens, ..Nothing ,...Untill Piston MOVES DOWN-..... Creating a Depression-Vacumn as Intake Valve is Opening , ,Intake Stroke-(Air Starts Moving) , - Compression Stroke- Combust- Power Stroke- Exhaust! Stroke........ Overlap is way down the List, 720* -4 Strokes !
Where is Piston @ Max Overlap Valves are maybe Open 50*-60*??? ...Where is Piston @ Max Overlap??? @ TDC- Dead Stop- Min SQUISS ! You said Ex pulling 120" Vacumn out the Ex??.
..
.Exhaust Valve Opens when Power Stroke Ends, near 75* ATDC !! Exhaust has been Open for 250* before Overlap ,
Ex Pressure at OPENING dosen't Stay the Same with Valve OPEN ??, getting Weaker and Weaker Ex Pressure every Degree !!!.....120 *..I Question ??.
.How much Vacumn can it pull in Last 60*- ? So Piston has to Pull Down against 120" of Vacumn ??? Think Simple
One needs to also remember that head porters whose work found its way upon engines create test results to some degree. While flawless understanding of internal combustion minutia may still be guesswork, when flow bench work correlates with increased performance, it should be given due attention.