Darren Porter – to Feel Again

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   '63GT Well-Known Member

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   We ended the offset installment finding the Int port hit 257 cfm.
   Not bad for a port merely about anyone could indistinguishable in their garage.

   Although I was happy to hit this mark, without anything elaborate, it also meant the Exhaust side had it'southward work cut out for information technology.
   A lifetime agone, information technology was thought exhaust port menstruation percentage of 70% was all one would needed.
   As conventional wisdom prevailed, this percentage jumped in 5% increments over the years, to the point of 80% in many circles. At least in the magazines.
   Reher & Morrison, too as many others nonetheless debate threescore% is plenty.
   I'm certain there are some on this forum who may have differing opinions on this besides.
   And that'due south ok ! I desire to hear their opinions too !
   I think the key thing here is keeping the apples abroad from the oranges.. A race only application may be ok with, say 70%, but ane who is running a street deal with closed exhaust may go a crash-land from a higher per centum.

   How does the Magnum Exh port faire? Well, in OEM form, about 73%. Wow, that's cool. This could be why and so many are getting practiced to dandy results with True cat backs and such on their Mag power trucks.
   I used to own a cute 2001 Dakota RT that responded very well from a well crafted DIY Y-piping.
   Ok plenty of that !

   Equally in the Int test, I freshened up the Valve Job first.
   This is what I ended upward with.. pass-able.
   
   Mag Exh baseline OE port./ 35°back cutting .125 wide .090 seat
   .050 31.2 /27.0
   .100 55.eight /59.ix
   .150 fourscore.vii /84.3
   .200 104.ix /108.4
   .250 124.9 /126.two
   .300 138.eight /138.0
   .350 146.half dozen /148.iii
   .400 151.iii /152.3
   .450 154.0 /154.v
   .500 155.8 /157.ii
   .550 156.9 /156.5
   .600 157.iv /157.3
   As you tin can come across in the Baseline Exam, this port is starting to flatten out even at .350 lift, and almost completely by .450. It really could exist better, just at 73%, it gets past.
   Only, we're at 257 cfm @.500 on the Int. We Need more, even just to hit 70% of that! which is 180 cfm. Preferably at .500 lift.
   The BC valve helped in the lower lifts to about .300. The .050 lift point was really noisy. probably due to the ledges in the chamber. We'll set up that afterwards.
   Before nosotros get to pace 2, I'd like to point out a few things..
   The Net valve area is 1.984 sq in (valve surface area - stalk area =1.984)
   The Bowl surface area (OE) is one.430
   A rough approximation of area between the SSR and guide is less than one.25 (yes one.25)
   Port surface area at the gasket (terminate port 1,7, 2,8) is ane.640 (the middle ports are smaller due to the angle on the ports lower half and flows about 5 cfm less )
   Patently, there'due south a major disparity in CSA in a span of merely 2.3" of port length.
   The only saving grace in this port (in my view) is the generous SSR. Even though the majority of port flow is upon the roof.
   Seems dismal, doesn't it ? Allow's printing on.
   Permit'south open up the bowl upwardly. There's a factory counter bore below the VJ, but only visible 2/3 the way around. Do the best you can to follow this the whole way around. take it all the way down to the guide. I used a ane/ii" Oval burr here.
   Something like this:
   
   You can see a partial shadow of this counter bore.
   Exam 2 opened bowl.
   .050 28.0
   .100 64.three
   .150 88.5
   .200 110.1
   .250 127.eight
   .300 143.7
   .350 155.5
   .400 161.vi
   .450 164.half-dozen
   .500 166.9
   .550 168.9
   .600 170.1
   Well, that was a pretty handsome gain, given the major pinch in the SSR/Guide expanse !!
   I'm encouraged ! 13 more cfm, and nosotros'll have hit our target of 180.
   Now permit's thin the guide some. About like this (sorry, it'southward a scrap dark):
   
   .050 28.6
   .100 65.4
   .150 91.4
   .200 112.1
   .250 130.5
   .300 147.five
   .350 160.7
   .400 167.five
   .450 170.2
   .500 172.1
   .550 173.ix
   .600 175.2
   Ok, this is getting fun now !
   Similar most Exh ports, the roof has a problem. A hump, like y'all encounter here:
   I scratched out a parameter here with a layout pencil.
   This hump (sad difficult to see) needs to exist gone.
   Problem is, we don't know how thick it is here. So, in some other port I previously ported, I found out. See below:
   That'south correct, I drilled a hole. My apologies again, its difficult to make out but, that hole is approximately .125 (1/8") deep/thick. (I'll tap it i/4-twenty and put a set spiral in it for time to come testing)
   With that, grind away! only go far flat. Remove about .080" at the apex.
   Roof made flat test:
   .050 28.4
   .100 64.8
   .150 xc.5
   .200 112.1
   .250 131.ii
   .300 149.2
   .350 162.7
   .400 170.1
   .450 173.6
   .500 176.0
   .550 177.9
   .600 179.ix
   A gain, merely smaller than the final test. Our restriction is in another area.
   My estimate information technology'southward in the factory type Valve Task. Like with the Int, I'm going to use a much larger stone to clean up some of the ledges higher up the manufactory top cutting.
   I will also motility the seat out to a diameter of 1.590. .030 smaller than the valve. Then a 60° bottom hopefully .080 wide and finish cut of 70°
   Sorry, got all excited and forgot to take a picture show. (I know, I"chiliad fired)
   .050 28.0
   .100 57.0
   .150 92.9
   .200 116.0
   .250 135.8
   .300 153.0
   .350 165.vi
   .400 171.iii
   .450 173.8
   .500 176.4
   .550 178.8
   .600 180.2
   The gains are slowing downwards... still a problem elsewhere.
   The racket in the low lift came dorsum.. Let's debur it.
   
   That'due south better!
   Debur exam:
   .050 28.7
   .100 56.0 (humm)
   .150 93.iii
   .200 117.1
   .250 141.0
   .300 158.2
   .350 168.half-dozen
   .400 172.ix
   .450 175.4
   .500 177.7
   .550 179.5
   .600 180.5
   Some nice gains in the mid lifts.. But still not responding like we need it to. We're sooo close.
   Nosotros haven't touched that SSR. It'south crease fourth dimension. I'1000 not ready to punt, however..
   This is what I did:
   
   The light green is where I started to grind, the darker greenish is where I removed about .035" worth of SSR, and the longer dark-green is showing the boundary line I ground to while I also widened the port some.
   The Hail Mary to 180 cfm test:
   .050 29.0 (?!)
   .100 57.8
   .150 94.five
   .200 118.6
   .250 141.2
   .300 158.two
   .350 168.7
   .400 173.vii
   .450 176.6 (feeling better..)
   .500 179.i
   .550 181.i
   .600 182.2
   Just in the nick of time! are you feeling the love correct now?!
   In the dorsum of my listen, Maxwell Smart is proverb, '..missed information technology past THAT much!'

   More than flow probably could be had past getting afterward that roof some more, Definitely the pinch between the SSR/guide expanse.
   Taking a break for now. Permit me know what y'all think.
   I"m just glad we met the goal.

   Last edited: Jun 25, 2020
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   '63GT Well-Known Member

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   I saw your other post... Thinking on getting a demote?

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   '63GT Well-Known Fellow member

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7. 

   pishta I know I'm right....

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   Oooh, OOoh! Do some LA's next!

8. On exh period ratio, theres ideal and then in that location is what works, then at that place is handicapped. You can be pretty far beneath ideal and make large power. There are ford BB heads that when full ported...are as low as 50% ..and make 900hp on 470+cid. Could it make more.. aye... just it's still making 900. A quiet non turbulent exh port is something not a lot talk about. That'south of import too. Possibly more than so. Great thread, nosotros needed one on these.

   Concluding edited: Jun 25, 2020

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9. No, sir you don't get to practice that. I pulled out the popcorn for keeping rail of the first mail service. I volition not be left standing alone waiting in the theater. I could have missed this and been cleaved heart'ed. Waiting, waiting for your render. Like a lost love matter after the allies won the war. Do yous have no feelings sir for you true-blue audience? I feel then used and cheap.... I'1000 gonna need shower and a Brillo pad.

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10. Great mail service! Thanks for taking the time to share.

    • Thanks! x i

12. Lack of emojis brand for very dry humor.
    Still humor none the less. Lol

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    '63GT Well-Known Member

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    Well, maybe.. I don't have a donor head to scratch on.. (I don't think..)
    I accept a set of 906'south I Need to finish, also every bit a set of 452's (?) I may do something there..
    I have a carb project I shelved for ... ambition to kick in.

14. Super threads '63GT

    Edit
    That goes for the intake and exhaust threads.

    Last edited: Aug 19, 2020
15. 

    '63GT Well-Known Member

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    Thanks !! grab the Exh port thread besides?

    Edited: Int port ! non exh

    Final edited: Aug 19, 2020

16. I wish I could change some of you guys thinking on frazzle flow.

18. I'd like to hear your accept on it too.

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19. What is your take on frazzle period?

20. 
    Words out of the mouth of a head porter way meliorate and smarter than I will ever be. (Darren Morgan)
    Flow numbers hateful nothing on an exhaust port. Air speed should exist at least 325 FPS in the port.

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21. 

    '63GT Well-Known Member

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    I recall I have a SpeedTalk interview with Darren Morgan.. I'll have to see if I could dig that upward and run into exactly what he's proverb.
    That could be sliced a number of different ways.. A larger valve with the correct shaped port would hit 325 earlier in the lift bike, than a smaller i. Which would dramatically change 'accident-downward'. Not to mention the effect on 'overlap'.
    Interesting, nevertheless. He'due south no dummy.

22. Just throwing this out there but my cheap azz small block Speedmaster Head has airspeed over 325 FPS with a little port and shortside shaping. It was so good I refused to touch the valve job. It was also one of the calmest sounding later market modest block head I accept ever tested out of the box. It shocked me.

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    '63GT Well-Known Member

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    I noticed that on mine as well.
    Was the valve task concentric, at least, on the exh ?
    I did a set up of Edelbroke E Street heads for a buddy last calendar week... some of the seats were out .009

24. 
    Heck as wide as those exhaust seats are they could probably be out .030 and seal up. Lol.

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