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Author
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Topic: Redline
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streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
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posted 02-20-2003 08:37 PM
   
What are factors that determine "redline", how high the engine will rev before you mess something up? On an internally stock 289, what would be the redline? would a valvetrain upgrade allow to rev a lot higher?
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Trailer_Trash
Gearhead Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003
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posted 02-20-2003 10:03 PM
i think you could probably get up to 6K rpm before your engine self-destructs 
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 02-20-2003 10:11 PM
quote:
Originally posted by streetstang67:
What are factors that determine "redline", how high the engine will rev before you mess something up? On an internally stock 289, what would be the redline? would a valvetrain upgrade allow to rev a lot higher?
Yes the valve train is the limiting factor on a stock 289. The bottom end can handle much more because of the short stroke and the low piston speed. With solid lifters and roller rockers it would survive 7,000 rpm for short bursts, assuming the heads, intake, and exhaust will let it rev that high. SteveW
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 02-20-2003 11:04 PM
Ditto. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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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streetstang67
Gearhead Posts: 397
From: SC, USA
Registered: Nov 2002
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posted 02-22-2003 12:45 PM
What would go wrong if I tried to rev a stock 289 to 7000rpms?
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 02-22-2003 01:06 PM
Lots of possible broken parts! 
Springs, push rods, lifter explosions for starters.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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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Trailer_Trash
Gearhead Posts: 428
From: Alpharetta, Ga, US
Registered: Jan 2003
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posted 02-22-2003 09:37 PM
in other words, not a good idea 
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james306
Journeyman Posts: 82
From: falmouth,me,usa
Registered: Feb 2003
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posted 02-23-2003 05:24 PM
better hope you got arp fasteners down bottom. 
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Rory McNeil
Gearhead Posts: 1542
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 02-24-2003 12:10 AM
WHY, would you WANT to twist a stock SB Ford that high anyway? If it stops pulling at 5000 rpm, waiting for the tach to climb higher certainly seems like a waste of time to me.  ------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 02-24-2003 09:29 AM
Here's my experience on building a "nearly" stock 7000 rpm SBF. The limiting factor is the stock valve train and stock ignition. The stock ign. coil will break up at aprox. 6200 and the stock rockers and springs will cause problems too. Once you rev past 6000, the valves will begin to float and the stock rockers will most likely bind up on the studs and break. I got mine turning to 7000 by changing the stock ignition to Pertronix with the recommended coil. Then changed the weak stock springs and retainers to something with about 100 lbs seat pressure and also upgraded the stock rockers to CompCams roller tips. The hydr. cam I had still "peaked" out at 6000, but the engine kept pulling smooth to 7000 if needed. Don't expect a high mileage shortblock to last too long at those rpms though. Everything needs to be new and tight for it to last.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..
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