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Author
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Topic: Working the bugs out of the 331
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 03-29-2003 11:09 PM
   
I made a few test runs today after installing the pressure regulator on the fuel pump. The track was running 1/8 mile brackets and I didn't get to run it all the way out, but I didn't notice any carb problems this time. My 60' times are improving. I pushed the launch up to 3000 rpms and netted 1.75 60' but the motor felt a little lean at the top. I think the bigger K&N filter that I put on is gonna need bigger jets than the 70s that I'm running now. Anyway, my 1/8 mile times improved to 7.71 @ 93 mph.  I'm pretty sure that 11 seconds is in the bag so what comes next? Am I gonna need bigger axles for the 9" 28 spline? Will I have to put in a roll cage to run under NHRA rules? Things are changing pretty rapidly as I start to push the new motor up the rpm scale. ------------------
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, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH [This message has been edited by bluestreek (edited 03-29-2003).]
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stoker
Gearhead Posts: 159
From: folsom,cal,
Registered: Jan 2002
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posted 03-30-2003 12:21 AM
on the dynojet last week,there o2 sniffer they put in rear tailpipe read 13.8 to 1 AFR ussing 76 primarys and 84 sec.that is with 750 proform main body with downleg boosters.awwsome 60 foots,are you running front sway bar?last time at strip the best i could pull with drag nittos was 2.08
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 03-30-2003 01:10 AM
The drag radials are starting to wear down a little I guess. The front sway bar is still in but I'm saving that as an ace in the hole. The springs are all original 6 cyl, the front shocks are gas filled, the rear shocks are Napa replacments from a 73 Cougar, and the traction bars are some 20 yr old contraptions that I extended to reach under the spring eye. Nothin fancy here, just some good weight management. Lot's of aluminum on the motor with a figerglass hood and BIG battery in the rear.  ------------------
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, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH
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stoker
Gearhead Posts: 159
From: folsom,cal,
Registered: Jan 2002
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posted 03-30-2003 09:00 AM
what was original jetting and where are u now?i run air gap dual plane,does single plane require different vs dual?our weight distribution sounds identical,i even have 90 pound boom box in trunk.my springs are stiff though,620lb front coils,five leaf,lowered upper a-arms,kyb gas shocks,i am trying not to get caught up in draggin (only go two or three times a year) will slapper bars help my combo? i love to fishtail at speed,but the et sucks. LOL
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 03-30-2003 11:21 AM
Sounds like you have a good road handling package that's not good for the strip but traction bars should help your setup by transferring some weight to the rear tires. They use the axle torque and bar as a lever to lift the front and force the rear down. Here is something very similar to what I use:
http://store.summitracing.com/partdetail.asp?part=14999 I forgot to mention that also use a 5/16" steel chain to hook my drivers side of the engine to the frame. It works as a torque plate to keep the motor from twisting and possibly seperating the motor mount. The twisting of the motor wastes energy and also allows the drivetrain and headers to get in a bind. ------------------
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, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH [This message has been edited by bluestreek (edited 03-30-2003).]
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-30-2003 08:46 PM
quote:
Originally posted by bluestreek:
...I pushed the launch rpm up... and netted 1.75 60'.......so what comes next? Things are changing pretty rapidly as I start to push the new motor up the rpm scale.
Dan,
Glad to hear the new mill is running great and you've got more power to play with!  You mentioned that you extended your traction bars....although you didn't mention it, did you also gusset your spring perches? Remember what 'Mark T 7724' said on the subject about a month ago, "They will roll, it's only a matter of when." You asked, "...so what comes next?"
If you haven't gusseted them yet, maybe that should be what you do next. Otherwise, 'what comes next' could be one he!lva noise when your perches collapse, the rearend turns, snapping the U-joint & bending your driveshaft into a banana & spins your pinion yoke upward and it tries to chew it's way thru the floorboard!  You do WHAT you want WHEN you want, Dan. It's your car & your $$. Don't take this the wrong way - I'm trying to be helpful. I'd hate for you to have to face that mess as I did!
Ryan
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 03-30-2003 11:25 PM
I'm one step up on you Ryan. I cut the gussets out already and plan to have them welded in this week along with installing a driveshaft loop and possibly subframe connectors. I take all experienced advice on this forum very seriously and appreciate all the knowledge I have gained here. ------------------
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, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-31-2003 08:07 AM
-- WELL DONE!!!!!!!!!!!!!!!!!!!!
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