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Author
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Topic: Single plane 390 intake?
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Fastback68
Gearhead Posts: 3702
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 03-27-2005 08:17 PM
   
I'm a little out of my depth here, so be kind 
I've got a 390 4V intake where the divider in the hole in the top has been crudely removed. Does that make it a single plane, rather than a dual plane?
And why did someone do this? Is it to increase top end?
And should I grind it down and make it all smooth and beautiful? Or maybe the ragged edges will help atomization?
Thanks!
Simon
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 03-27-2005 08:38 PM
That was done to increase top end power Simon.
It was an old trick done to dual plane intake manifolds to increase the plenum volume.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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XR7
Gearhead Posts: 147
From: north Idaho
Registered: Mar 2003
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posted 03-27-2005 09:08 PM
There is a real good post on the FE forum about a blue thunder dual plane intake on a 492 FE on the dyno. He made a removable divider in the plenum and had diff. height shims to see the diff. on the dyno. The 1" made the best power. He aslo tried 4 diff. headers and two diff. intakes and two diff. carbs plus nitrous. Best puuls were 667 N/A and 778with a small shot of nitrous. here is a link, very good read.http://www.network54.com/Forum/thread?forumid=74182&messageid=1111824824 ------------------
68 Cougar XR7, 428 4-speed, Best ET 6.82 @ 101 1/8, 10.69@ 127.44 with 1.51 60 ft. Street legal all steel car w/ full interior.
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 03-27-2005 10:17 PM
Weiand makes a plenum divider kit.
Offy used to sell a intake called a Dial-a-Flow which had replacable plenum inserts in several sizes and configurations.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
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