DBG: Darin Morgan, Mystery Of The Short Turn, Why Similar Heads Make More Power Than Others ???

This video is from a live chat Darin And I did together. The head and ports in beginning are the Ford 351 Cleveland A3 Motorsport Aluminum heads he did for me, Currently on the Cougar 409 Cleveland. It made 775hp, with too small of cam, and not enough compression. Next build 800hp goal. This video has some very cool concepts, the relation ship of the intake runner angle, and short turn radius. How the short turn effects power curve. As you stand up the short turn radius, that increases torque, as you lay down the short turn radius, that increases top end power. Also Darin gives a good example of why some heads make more peak power than others, even though they make close low and mid range. Just a great easy explanation of some concepts that are not really talked about much.
He also mention, Engine OverRev reasoning, and benefits, along with two worst things for a valve train, Shifting, and Rev limiter
DragBoss Garage: Where Your Always Seeing, And Learning Something New."

[@ElvinLeadfoot]

Interesting that Darin says most people don’t like to talk about it. Well Tim I can assure you I like talking and listening about the Technical aspects.

[@DragBoss351Cleveland]

Good deal Elvin, glad your hear. Stay tuned.

[@Andy-t5e]

It's funny how guys on street bikes use bouncing the engine off the rev limiter for a horn. The valve springs must be loving it ! lol I could listen to Darin talk all day he's a great teacher a living cylinder head porting encyclopedia ! Thanks for taking the time to share your knowledge with the world !

[@DragBoss351Cleveland]

Ha ha, I have that. Yes he is the man, we actually planned on a live chat for Saturday, but waiting to hear for sure. As soon as I find out will make a post and place on community section.

[@clarkmcmahan1595]

Once again another good post .and I'm like Darren I could sit and talk about it all day

[@DragBoss351Cleveland]

Man ain’t that the truth, time flys

[@benrossbach6501]

As always great show. Thanks you so much Tim. Darin is one of the few at his level that are one willing and 2 able to explain this stuff in a way that, are at least for me make complete sense. Steve Morris is another. Again thank you borh.

[@DragBoss351Cleveland]

Your most welcome. I agree 100 💯 percent. He will be on live 11/4 at 7 pm. Intake Manifold design.etc

[@terryenyart5838]

Love the info. Darrin knows an amazing amount of cylinder head/port information. Love Drag boss too & your BA Cleveland Cougar

[@DragBoss351Cleveland]

Thanks much. Very appreciated. Trying to make a channel where you can see and learn all kinds of things. Don’t forget Darin will be on live at 7pm 11/4.

[@mikeleschber33]

Drag Boss, I love the content of your videos! I learn something from everyone of them. Thanks for sharing the knowledge with us!

[@DragBoss351Cleveland]

Thanks Mike,that’s what I try to do, knowledge is power and power is knowledge, glad your here!!

[@trailerparkcryptoking5213]

Darin’s passion oozes from every cell in his body! He loves this stuff and it’s unbelievable that he shares this knowledge that has taken him a lifetime to acquire! So unselfish, great human!

[@DragBoss351Cleveland]

Well said! My man. I agree 💯. He is the man

[@fredkelso1089]

Get with him on the short turn at higher RPM, now this is what I have learned in the past, Chrysler in the 60s measured airspeed in an intake at 800 MPH and it went higher in short runners, and the faster it went the less it wanted to do the short turn and it flew across the valve backside and out between the valve and the seat on the other side and that is when they started making the far side of the chaimber a 45 degree angle from the top edge of the seat up to the deck of the head, this kept the air stuck to the angle rather than it coming out from under the valve and slamming into a vertical wall

[@DragBoss351Cleveland]

I get it Fred, same with having short turn to high, acts like a ski jump. Never heard the 800 mph numbers. Good stuff Fred, thanks.

[@vincentenk4449]

When was this live? I'd be really interested in watching this. I seen a video he did on S/S AH Hemi heads & it was awesome!

[@DragBoss351Cleveland]

Look back through my live chats with him. Tons of great info you are not going to see anywhere else

[@vincentenk4449]

@@DragBoss351Cleveland will do!

[@rolandtamaccio3285]

,,, spintron or running engine, reference loft curve , ,,, ? ,,, on edit : of course the answer is both, but I'd like to hear of Darin's experiments on this cam technology .

[@DragBoss351Cleveland]

He will be on 11/4, 7 pm live chat.

[@benalamedaracing2765]

Thanks to both of you for an insightful talk and I enjoyed every part of it. One thing Darin brings to the table is track experience and I come from the same line of thought from all the work he has done and tested at the tracks. Experience beats experiments and we know many out there do many things without the benefit of track results. Dealt with many thru the years doing all sorts of tests and when I ask track results they say none... Oh well. Keep it up and we stay in touch enjoying your videos immensely friend.

[@DragBoss351Cleveland]

Thanks Ben, Darin was a fantastic job at explaining difficult topics, and yes, he does have the racing experience to go with it. The track tells the truth. You know that very well, with all the engines you have built. I will, so much already going on we will chat when we catch up...

[@stevejohnson6858]

And from my understanding, the short side radius is the trickiest part to port and get right/not screw up.

[@DragBoss351Cleveland]

Exactly. Not right fall on its face or not rpm and stop

[@deanstevenson6527]

🥝✔️

[@davidhakes3884]

Howdy Gent's. Great Subject and Bench Racing is always interesting.

[@DragBoss351Cleveland]

More to come!

[@mikecurtis2585]

Nice always interesting!!!

[@DragBoss351Cleveland]

Thanks Mike, and never know what you will see😊or hear

[@stevesolo16]

How does LAMDA play in the process of building/tuning?

[@mohanperformance.enginerd.1308]

Awesome explanation and from my experiance. Profoundly accurate. Darin Rocks! I will use this video instead of having to explain this to my customers. This was awesome.

[@DragBoss351Cleveland]

Your most welcome. Please have them sub, Darin will be on 11/4 at 7pm, stay tuned for announcement, link on live chat 😉

[@Hitman-ds1ei]

I would really like to ask Darin on his comment on maximum 15° turning air if doing short side radius on SBC intake port like valve seat with ridges would work

[@DragBoss351Cleveland]

Yes keep that question handy, try addressing it on his next live

[@michaelclanton1152]

You picked up a lot of flow all the way and great low end #,s

[@DragBoss351Cleveland]

Yes those are the heads on the Cougar currently, before work car ran 9.66. Darin said needs more compression and bigger cam and will make 800 hp

[@theshed8802]

Absolutely awesome stuff, as usual

[@DragBoss351Cleveland]

Quick and easy…, out

[@robertgardner1259]

Thanks DB, Another awesome video.

[@DragBoss351Cleveland]

Glad you enjoyed it

[@Bluflash4694]

Guess I need to sell the boss 302 heads I WAS going to use! Nice and from Kasse. How many $?Lol,if I gotta ask how much,then I can't afford it!

[@DragBoss351Cleveland]

Head work is done by Darin Morgan. I think retail for a job like this is probably close $4500.

[@stuartwall8212]

The short turn on Cleveland 2v heads is that square shape Darin made with his fingers, and it has a monster bowl. On a pressure drop flow bench, low lift flow is incredible up to about .35 lift at which point the numbers fall away and a hurricane noise starts up. When the short turn is made into a turn instead of a box edge, low lift suffers somewhat but the flow is steady from .35 to .55 and the turbulence goes away. Is there any point to messing with an open chamber 2v head? I was driven purely by curiosity, but what I found has driven me to find a purpose for these heads.

[@DragBoss351Cleveland]

Not a fan, but they will make power too. Remember not racing a flow bench.

[@vadenk4433]

I've seen pics of closed chamber 2V heads from Australia. I've had good results running 2V heads. I'm nothing more than a hobbyist though. But definitely check out Revan Evan's youtube channel. He's got a video of a friend who's fox body Mustang is running 10's with OEM iron, open chamber 2V Cleveland heads. Obviously he's running an aftermarket 2V 4bbl intake, with a hotter cam etc, etc.., but it's putting out 550 HP. And he says its a very basic build, using a lot of stock parts. And he's been racing it since the late 80's. It does wheel stands too :)

[@Comet-hn3gm]

This is very informative. Thank you.

[@DragBoss351Cleveland]

You are so welcome! Glad you got something from it.

[@WesternReloader]

Can a larger port (vs standard for application) reduce the negative effects of a abrupt short side? As air flow is not touching the wall of short side? (Boundary layer)

[@DragBoss351Cleveland]

Not sure but the larger port will slow down the velocity and may allow smother entry?

[@WesternReloader]

@@DragBoss351Cleveland that’s kinda what I was getting at. Not thinking low rpm, more mid/upper. I run 190cc blueprint heads on my 331 sbf, and it’s geared so low rpm isn’t an issue. Still I wonder how much bigger port volume would improve flow before it’s too big

[@DragBoss351Cleveland]

@piercer2 I don’t think a flow bench would tell you accurately. To me it’s a track test. But what do I know? 😳

[@finnroen2334]

This is excellent and a joy to watch and listening to. Thank you.

[@DragBoss351Cleveland]

Thanks and tell all your buds. More on the way😉

[@treyrags]

Good stuff from Darin as usual

[@DragBoss351Cleveland]

Yes sir and more on the way. Live chat 11/4 at 7pm

[@williemoon7522]

i am not going to disable add blocker so i guess its` goodbye to youtube .. is tic tok about the same thing ?

[@DragBoss351Cleveland]

No idea what your talking about Willie?

[@brianb8489]

You ever find any info on those Cleveland heads i mentioned some weeks ago? They were a dart or world products head that was a cast head with aluminum plates that were an as cast head with the exhaust ports moved. I mentioned they were sold from summit in early 2000's for a sale price of 1000$. They were advised as a Bob Gliden head.👈

[@DragBoss351Cleveland]

Never saw them or found them. I have summit catalog from later 80s, but nothing in 2000 range. Any luck?

[@brianb8489]

@@DragBoss351Cleveland no luck here. I wish I would have saved my catalogs I would have mailed it to you.

[@brianb8489]

@@DragBoss351Cleveland still makes me wonder though, alot of guys I knew back in the day were running gt-40p heads in mustangs with nitros claiming all "stock" makes me wonder if they would have made more power. But I don't know if the intake would match to pull off the sleeper hustle.

[@DragBoss351Cleveland]

@brianb8489 I would have appreciated that greatly. Mail me something to hang in DragBoss Garage and I will mail you something back 😊

[@DragBoss351Cleveland]

@brianb8489 what intake? Motorsport