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Author
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Topic: MSD 6A or 6AL, which is best?
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gallopingghost
Journeyman Posts: 51
From: savage, mn, usa
Registered: Nov 2003
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posted 02-10-2004 09:16 AM
   
i am in the process of getting a new ignition box for my 68. which is the best and what is the difference?------------------
8F01C120929
1968 Red Mustang Coupe
289 2v
Manual 3-speed
hooker headers
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SteveLaRiviere
Administrator Posts: 42139
From: Saco, Maine
Registered: May 99
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posted 02-10-2004 09:21 AM
The only difference is the 6AL has a rpm limiter which you set by changing fuse-like plug in chips. It's nice to have but not crucial for most street cars.------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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gallopingghost
Journeyman Posts: 51
From: savage, mn, usa
Registered: Nov 2003
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posted 02-10-2004 11:03 AM
why would a person want to limit rpm's? excuse the question, i'm new to this stuff. thanks.
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bud4660
Gearhead Posts: 495
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 02-10-2004 11:14 AM
quote:
Originally posted by gallopingghost:
why would a person want to limit rpm's? excuse the question, i'm new to this stuff. thanks.
So you dont over rev the motor when you miss a shift. Its more a safty feature then anything else. I went with a 6AL in the car I am building now.
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trashline
Gearhead Posts: 1217
From: Levittown, Pa
Registered: Dec 2003
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posted 02-10-2004 11:38 AM
i have the 6a box in my coupe works great cant complain at all. like was said earlier the al was a rev limiter on in
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Red65
Gearhead Posts: 115
From: Northglenn, CO, USA
Registered: Jul 2002
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posted 02-10-2004 11:43 AM
If you have a stock intake, cam, and valve-train, you won't won't need a rev-limiter as the engine will run out of air before you reach an RPM that will hurt the engine (my stock A-code dies at about 4500). If the engine breathes well, you may want one so that you don't over-rev the engine and break it. It's hard to get off the gas when the engine is still pulling at 6000 RPM!
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SteveLaRiviere
Administrator Posts: 42139
From: Saco, Maine
Registered: May 99
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posted 02-10-2004 12:39 PM
quote:
Originally posted by Red65:
It's hard to get off the gas when the engine is still pulling at 6000 RPM!
...and that Camaro is still at your rear quarter!  ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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bud4660
Gearhead Posts: 495
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 02-10-2004 02:23 PM
quote:
Originally posted by SteveLaRiviere:
...and that Camaro is still at your rear quarter!
Steve: Leave them chevy boys alone!!! They cant help it their slow!!!
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N266fords
Gearhead Posts: 1373
From: Spokane ,WA USA
Registered: Apr 2003
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posted 02-10-2004 03:01 PM
there is nothing wrong with Chevy's. Dont you know they would have been fast if they had ford motors put in them.Bruce
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bifs66
Gearhead Posts: 240
From: Maryland
Registered: Apr 2000
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posted 02-10-2004 11:05 PM
The 6AL probably saved my engine (solid lifters) several times with my screwed up shifting skills. I always thought that a "stock" 289 would rev until the hydraulic lifters gave out (around 5K rpms). So a missed shift could still over rev a stock engine's valvetrain capability. Although it may not cause any real harm, I can't believe it's good for the engine.------------------
Bernie Frank
66 Fastback restomod (12.8 @ 112mph)
85 GT (preserved)
2000 SVT CONTOUR
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Tom G
Gearhead Posts: 552
From: Bethlehem, Pa USA
Registered: Nov 2001
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posted 02-11-2004 03:28 PM
quote:
Originally posted by bud4660:
Steve: Leave them chevy boys alone!!! They cant help it their slow!!!
Shouldn't let them Chevies get that close. ------------------
67 Mustang Shelby clone F/B 302 GT-40X FMS Crate engine 5 spd cable clutch 13.39 on 205/70/14 BFG @104 mph Flowmasters X Pipe 4.11 9". BIG Body shop NOW! 03 Focus ZX3 BORLA exhaust Wings West spoiler (Arrest ME RED)
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