Experience is the best teacher. R&D on a cylinder head teaches you exactly what it takes to make HP for that head. Thanks for sharing and explaining so easily.
@Greybuiltracing5 ай бұрын
The more I watch Eric’s videos the more I understand where I’m messing up at . For example, I thought the throat was the cross section area .. right before the valve boss going into the intake . It’s the valve seat area , right before it and after it . I’m fairly new at porting mini bike 4stroke engines and don’t really know the terminology and names of these ports .. some but not all . This helps a lot ! Ty🙏🏻
@LOSTXPLAYGUN2 жыл бұрын
There are so many people around my area that use the bowl hawg. I have always been against it for the same fact you are describing as the venturi effect. I am by no means a guru but learned to do mild head work from a gentleman who worked for Audi's performance division and was kind enough to teach me. He always said less is more, mostly because most people do more and then end up with less as a result. Thank you for your informative videos, subscribed.
@ameliachristian60992 жыл бұрын
I have a lot of respect for you, and the things that you do. I appreciate your honesty, take care.
@alejandro526122 жыл бұрын
Would be great to have a series like this for 4 valve per cylinder heads
@michaelblacktree2 жыл бұрын
I would love to see some 4-valve stuff.
@servediocylinderheads2 жыл бұрын
Excellent video Eric, all good points. I was surprised when I flowed some of my 90's work that ran really well had swirl up to 4000! Sbc
@theshed88022 жыл бұрын
Excellent video. Thanks Eric
@basketballcory22 жыл бұрын
Thanks for all the great content
@goodfellasinc.56482 жыл бұрын
Lol I knew the small block had a better swirl but the question is why I've been porting for 40 years maybe a little more And I've also done diesel Porting and two stroke porting I would love to show some top Secret stuff I've learned over the years see what you think about it
@WeingartnerRacing2 жыл бұрын
I would be happy to see it just email it to me.
@markwallace52742 жыл бұрын
Love your videos and the knowledge you share I would love to learn more about throat percentages with a 4 valve head if you could share that percentage ? I tend to work on and mess with overhead cam 4 valve per cylinder engines mostly Honda B Series
@marklowe74312 жыл бұрын
Such an art. Lot of people talk about flow but never air speed.
@johnb74302 жыл бұрын
The relationship between swirl and flame propagation / completeness of burn would be interesting.
@TravosGarage2 жыл бұрын
hi Eric, great video! is there any chance you would be able to do a video on combustion chamber shape? especially on how to make a poor combustion chamber shape better? it would be excellent for us guys who have engines without aftermarket options for cylinder heads but still want to make the best out of our stock heads? and also how shaving the head to improve compression may effect how we need to go about shaping the chamber to improve flow?
@DuffusMonkeyАй бұрын
I love the Harbor Freight calipers 😂. I use them too
@charliehupp53852 жыл бұрын
Eric. I am glad you have so much work. The "Dog Leg" in the exhaust is a great idea but it belongs on the "No Flow side. Try it Sir.... It set many world speed records in 1985 or ask Bob Morgan
@WeingartnerRacing2 жыл бұрын
Ok.
@iceman9678 Жыл бұрын
Thank you for the explanation. It's too easy to screw up a port job. I might pass on the porting (minus removing of casting imperfections) of my Rover T16 head.
@alexsiurda60282 жыл бұрын
Would love to hear more about 4 valve stuff or what the knowledge you have about porting them, I watch alot of your videos but I only deal with 4 valve heads so its hard for me to know if i can apply these methods to them, muchly appreciate if you could.
@monadking27612 жыл бұрын
Good information to know. I have a old 283 with P.P. heads and were told it's not worth porting and still had hardened seats installed on the exhaust side. My feeling is, if it's cleaned up even a little you should get better flow. I cleaned them up a little and trimed around the valve stem area and slightly under the seats just to smooth it out to the seats. Then cleaned up around the edge of the shroud area in the chamber area. Woukd that really helps or hinder flow? I know not seeing the heads makes it hard to say but I figure it doesn't hurt to ask.
@rocketsurgeon112 жыл бұрын
So, you said that 4 valve heads have a slightly different set of "rules" when it comes to throat sizing and I am interested in what those differences are?
@michaelblacktree2 жыл бұрын
Likewise.
@BraapSupport Жыл бұрын
me to please
@JS-ri2rx2 жыл бұрын
Glad you pointed out the throat and the 1" before and after the valve seat. Im still learning but good video. So many porters in videos. But how many show a throat percentage. Almost none.
@YerkitRacingChannel2 жыл бұрын
I have always heard 90 to 91%. Good to see some numbers to back it up!
@indyrock81482 жыл бұрын
I wonder if they went such a big throat to try blend out the famous Pro Comp under seat ridge? The procomps I messed with for practice actually had been further ground in this area. Someone just wailed in there with a burr. A 2.08 valve and 90% throat didn't get it all out. Though I managed to blend seat with alli.
@BDauto862 жыл бұрын
Thanks for sharing Eric.
@stevenhobbs7092 жыл бұрын
When procomp first appeared years ago, I was curious, but the magazine ad had some typos, as a business owner I’ve had this happen, it leads to conversation about them fixing it and what compensation are you giving me. But the next month was the same…went on for at least six months as I recall. What I inferred is a lack of care for the details.
@danielesilvaggi2 жыл бұрын
Well in my opinion you don't need swirl to turn a fan, air just moving straight through will spin the fan. So, I don't see how you can tell if it is actually swirling. Great question. I would like to see a clear tube at the fan with smoke in the air to see if it is in fact swirling.
@servediocylinderheads2 жыл бұрын
The blade is parallel to the flow. Only angular flow will produce torque to turn blades.
@CherezianRacing2 жыл бұрын
Man i wish this video had come out before i butchered my first attempt at porting some old iron eagles. Took that throat right to the 45 cut :/
@rumblecanada2 жыл бұрын
Thank you for your knowledge! Have you done any ford 4.6 2v? I'm about to port some heads and could use some advise. Any info would be much appreciated. Cheers
@MX-fo2nu Жыл бұрын
Very good and clear detailed describtion, thanks i Do this next time better i still have Material to Do better undercut an improve top cut. at my 914 heads.
@ankualex2 жыл бұрын
any advice for porting to get a better performance / torque on low rpm?
@JohnClutch1 Жыл бұрын
My guess is GM had this as a consideration when designing the LS cathedral heads. Now onto the video.....
@buchascii92 жыл бұрын
Would. Like to know what you think about dart pro 1s older ones
@jimmybare30262 жыл бұрын
Speaking of 94%. You're probably getting near the actual numbers of people who have mistakenly hogged too much out of this area including myself. Common sense says the bigger the opening the more air can come through there. Like the saying goes just because it looks good on paper don't mean that it will in reality work. The bad part, once you remove this material, your street car's going to suck worse than it did with the stock heads and few will understand why.
@flflash47172 жыл бұрын
Eric I can't seem to find the first video? Interesting content!
@tomv75522 жыл бұрын
The small block head. Believe it or not, OEM’s do a lot of R&D to get the most out of their engines while meeting performance goals. They quite often hold back the power so they can keep the same platform for many years while changing minor details for more power in the next vehicle model
@faxxzc2 жыл бұрын
or emissions
@ts3022 жыл бұрын
Excellent content Eric! My hangup with flow bench testing is how does it translate to a running engine. To clarify, airflow in a running engine, starts & stops due to the valve opening & closing (one issue). On a flow bench, a port flows in one direction. With respect to swirl, is too much swirl detrimental? I visualize air/fuel separation with high swirl (centrifugal force?), especially with carbureted engines (bigger droplets of fuel) compared to FI. What say you Eric? Thank you Tony. Also, please explain your 4-valve theory.
@stevenbelue54962 жыл бұрын
One of Vizards videos he vaguely talks about the centrifuge effect causing loss of atomization and large droplets being slung out onto the walls if you have to much swirl. So I would guess your right. IMO
@johnnyboyssite2 жыл бұрын
Hi Eric so i picked up some 702 castings for my MarkIV 462 BBC . will be primarily street driven. i want to maximize the low lift flow but keep the stock valve sizes. I dont own a flow bench. for the intake side if i just do a 4 angle valve job, blend the bowls into the throat area and clean up the ports should do the trick? on the exhaust side again a valve job , blend the bowls on the long side, streamline around the valve guides then deshroud some around the quench side of the exhaust valve give me good results?
@DropcordKustoms8 ай бұрын
Would having the throats to big cause or amplify idle/low speed drivability problems with a larger cam? (244@ .050")
@bdugle12 жыл бұрын
Another video full of interesting info! Next time you’re flowing a BBC head, I want to see the swirl difference on good port vs bad port. They are oriented very differently to the cylinder and I’m guessing that makes a big difference. Another question, can you have too much swirl? Great stuff, thanks Eric!
@seancollins97452 жыл бұрын
There so much you can get in the chamber and piston design in regards to mixture homogenization
@johnnyboyssite2 жыл бұрын
Hi Eric ive got a pair of 702 BBC heads. car will be mainly street driven but looking for max low lift flow. if i keep stock valve sizes should i still go for 4 angle valve job with 30 degree back cut and just blend the pockets into the throat area ( intakes only ). for the exhaust side , clean up the ports, blend the bowls on the long side and deshroud at the quench area ? its a 462 with around 9.1 CR
@sethmiller94422 жыл бұрын
I’d like to see what the swirl is on some Afr sbc heads.
@salvatorehayes27532 жыл бұрын
Will New Cut Valve Seats And Valves Leak Air Under Extreme Pressure From A Blow Gun? I Filled The Chambers With Water And Blew Compressed Air Right Behind The Valve. At 80PSI They Didn't Leak. But At 120PSI I Started To See Bubbles Slowly Grow. Should I Lap The Valves Or This This Normal Given The Circumstances. I Also Noticed They Also Made The Throat Too Big. Waited 2 Years And $1,800 Kinda Disappointed. The CNC Looked Good But It Did Look Like They Ate Into The Under Cut Like This Video.
@WeingartnerRacing2 жыл бұрын
It should remained sealed. The valve job isn't round.
@gavmorgan18462 жыл бұрын
Hi Eric ,love you videos and appreciate your time to help us . What about throat percentage on smaller valves , the remaining 10% of say a 2 .25 inch valve is quite a bit bigger than 10% of a 1.8 . I've ported a head with 1.8 inlet valves and I'm not game to go bigger than 88.5%.. Dose this factor in the equation?
@WeingartnerRacing2 жыл бұрын
I don’t port smaller than 1.94 so I don’t have experience with something that small.
@robert24132 жыл бұрын
Ok, I might be an idiot but I have an old 327 and have been thinking about those trick flow dhc heads. Heard there is a good amount of meat there to go bigger if you want to port. Like to hear if they are a possible starting place for a 500 horse 400 sbc
@mikemcglothin99886 ай бұрын
Are percentages as important on the exhaust as they are the intake?
@Henily12 жыл бұрын
Eric, 2 questions-How much bigger do you make the area directly under the throat? Is the throat measurement the same from the short side to the back wall?
@craigchiddo27942 жыл бұрын
What would happen if you fill the port floor
@danmoffitt45212 жыл бұрын
When you make the throat is it mostly contained in the seat? Trying to figure out how to word what I'm asking as in is the tightest cross section located on the pressed in seat and taper into the casting/bowl
@cstavro2 жыл бұрын
how about testing swirl on a stock LS3 with the "swirl wing" still attached? I think you'd be interested in testing swirl on a gen V LT1 head to...
@shanerorko80762 жыл бұрын
Hey Eric how much would you charge to buy a second hand set of late 2017+ gen 3 hemi heads and get them setup for a 224/232 cam on a 6.4l and send out to Australia? So new valves, seats and bowl blending ect.
@RollingThunder852 жыл бұрын
Do you have any bbf heads or recommend any brand in particular?
@shanerorko80762 жыл бұрын
The SBC head will have more swirl. I base this on LS heads in the cath ports having swirl features.
@EamonnSeoigh8 ай бұрын
I’d think it might be better to compare and predict flow with a complete view down the intake runner of both heads and a rotation of both with a view up the intake valve.
@WeingartnerRacing7 ай бұрын
I will work on that
@infantryman71392 жыл бұрын
The small block Chevy should have more swirl. Due to the port design
@rubbercitygarage2104 Жыл бұрын
Spring Inside Outside Divider Caliper Set Measures 8 inch Machinist Tools
@terryenyart58382 жыл бұрын
I would be interested to know what amount of swirl a good 700-800 HP head has (RPM & direction of rotation) versus a lower performance head,say 500 HP. I assume every head has swirl, but is this something a head porter is attempting to change to extract more HP or better combustion? I know head designers have to consider this as the vortices in the wrong area can make a poorly combusting head.. Thanks for great info as always. Terry
@johnginnitti45982 жыл бұрын
I Believe it would be the SBC head with higher swirl
@timothybayliss66802 жыл бұрын
Eric, have you ever tried a lower valve seat angle for mild street stuff? I remember a decade ago guys were using a 30 degree seat for flat tappet big block stuff. They were picking up flow under .400.
@ericbrandt8292 жыл бұрын
Pontiac used 30 degree seats on many motors....But, the loss after 0.400 if your using a decent performance cam....Your better off with the 45 degree seats from what I have seen.
@WeingartnerRacing2 жыл бұрын
No I would never use a 30degree valve job in anything I do.
@timothybayliss66802 жыл бұрын
@@ericbrandt829 ya, it didnt really make sense to me. Go through a set of heads with a valvejob and a set of springs only to put a hydraulic flat tappet with .450 lift in it.
@Bshiddy2 жыл бұрын
Pittsburgh and Harbor Freight?
@nathanaelwarden2 жыл бұрын
Do you ever do any work with 4cyl engines? Is the principle the same?
@4speed3pedals2 жыл бұрын
Are the ProComp reliability issues found in all their heads or just big block Chevy? How about the age? Wondering if issues have been address with more recent casting? Thanks.
@WeingartnerRacing2 жыл бұрын
Don’t know I stopped selling them years ago.
@DURRIESVISION2 жыл бұрын
The 'Slayers' i think🤔
@finnroen23342 жыл бұрын
I think the SBC has most swirl by a lot.
@patrickmoore10172 жыл бұрын
More swirl goes to the Dragonslayers.
@bigredracer78482 жыл бұрын
29👍's up EW thanks for sharing
@bigredracer78482 жыл бұрын
between cast iron big black Chevy heads aftermarket in aluminum big black Chevy aftermarket heads if you had them both ported and they both had the same flow numbers is it only the weight difference is why people choose aluminum over the cast iron one
@stevehammel29392 жыл бұрын
I'm curious about the difference in flow numbers between aspirated and supercharged applications, are the throat diameters larger for supercharged engines?
@WeingartnerRacing2 жыл бұрын
I will try to do a video about that later.
@tonyavila55562 жыл бұрын
Do the LSA heads show better swirl?
@HBJY-Cylinder-Head-Factory2 жыл бұрын
we're famous cylinder head block factory in China 🙂
@darrellsomers5427 Жыл бұрын
LS would be my guess
@firstworldboredom2 жыл бұрын
Would have been nice for you to explain the 90% in Part 1.
@WeingartnerRacing2 жыл бұрын
Back then nobody was really watching.
@charliehupp53852 жыл бұрын
hahahahaha The quotes about ' Restricted Area" on the small block head was MY Article in 1998 in Car Craft hahahahahha
@WeingartnerRacing2 жыл бұрын
I have heard it many times but I don't remember it in car craft.
@claas900172 жыл бұрын
Eric, Have you ever flowed or ported coyote heads?
@WeingartnerRacing2 жыл бұрын
No
@claas900172 жыл бұрын
I was just curious, I know in some or your videos you mention that a 4 valve head some things would be different. Like throat area ratio
@gjponsford48922 жыл бұрын
The dragon slayer is my guess.
@arturozarate17522 жыл бұрын
The Brodix SBC Dragon slayer
@xlr8r3VA2 жыл бұрын
I think it is the SBC head.
@peteJoseph-x3h2 жыл бұрын
Insizers…….you’re welcome
@davidreed60702 жыл бұрын
That would be the small block Chevy
@chucksmith71662 жыл бұрын
It’s a spring calipers
@tomkelly92062 жыл бұрын
Dividers
@Doug-b4p20 күн бұрын
Sbc has more swirl
@chucksmith71662 жыл бұрын
Sbc has mor swirl
@chucksmith71662 жыл бұрын
And has more swirl
@cameronsmith87302 жыл бұрын
What not to do.If you're Tube guru with NO experience at all in porting heads......don't touch them.
@michaelblacktree2 жыл бұрын
Here's a link to the first video: kzbin.info/www/bejne/d3ndiJxmepeHmq8
@cliftonsnider57762 жыл бұрын
not promoting procomp but we have seen american heads chunk out seat pieces..
@bobbyborba64602 жыл бұрын
Small Block
@johnkries81892 жыл бұрын
Small block
@JC-gw3yo2 жыл бұрын
Apparently, swirl is not all that important in making power as the LS engines are superior power producers
@WeingartnerRacing2 жыл бұрын
I don't know about superior power producers but they make good power.
@deerslayer58632 жыл бұрын
Flotec
@bassettraceengines2 жыл бұрын
Brodix 23
@johnmorris58342 жыл бұрын
Brodix
@jacksonbermingham21682 жыл бұрын
sbc
@goodfellasinc.56482 жыл бұрын
Sbc head duh
@jameslaurinitis75802 жыл бұрын
sbc head
@brucefulper24332 жыл бұрын
These are just flow numbers. How does the head work on the car??? Without that test you know nothing,
@WeingartnerRacing2 жыл бұрын
This is one piece to the puzzle.
@chevyrc36232 жыл бұрын
Ls3
@chevyrc36232 жыл бұрын
I was wrong lol
@juanf47392 жыл бұрын
Stop promoting harbor freight junk tools.
@thorout83772 жыл бұрын
It would be a very huge help if you showed us all how to port a V twin m8 heads 😉
@FACEBOOKS-WBDS2 жыл бұрын
I have been watching all your vids, and I have a few questions but can't find a vid close to my questions. so, here it goes....i have been told you can put a rectangle port bbc intake on oval port heads? Also I have tall deck engines and they use 1/2 spacers to fit intakes too......is it possible to machine 1/2 spacers with oval on one side and rectangle on the other is it worth the work? ( none of these are in a full race application)