We have a bracket race in a little over a week in Eureka, CA. It's an old track that has a short shutdown. It's right on the Pacific Ocean and has been around since 1955. It's in need of repaving, but they are still trying to find the money.
The "no box" class is 11.00 and slower and Melissa's '66 Mustang has run 10.60, in its latest "consistant bracket trim" it's running 10.80's with mufflers in the summer heat. It will be cool way up north in Eureka and it will run 10.70s there if the track has any traction. So what do you guys think will be the best way to get this thing into to 11's and have it run consistantly? The timing is already locked at 34 degrees. Should I retard it to 30 off the trailer and maybe limit the throttle? TIA for any ideas,

This last one is easy to make if you have an old piece of interior tin/ aluminum.

Using a electricians knock out/ drag out set or if nothing else a hole saw. use an old 4 barrel gasket as a guide. The outside can be trimed with a set of tin snips.
make the hole 3/4 to 1/2 the size of the carb holes and run it UNDER the spacer.

I'm too lazy to make a restrictor plate, or change the carb.

The carb is a 850 dp'r so ??? A mechanical throttle stop would work.

I could run a crappy edelbrock foam air filter. It's the only thing that fits under the hood.

Good Luck!

The car ran 11.28s on the primaries only and still pulled the front wheels 6"s off the ground with 425 cfms. Speed was down about 7 mph which was a good thing since the shut down is only about 1/4 mile. We saw one car go into the sand and get sideways, and it only ran 9's. This track was a great "experience". If you can concentrate on your opponent while trying to keep your car off the guard rails while going on a roller coaster that piches left and right, you can drive any track! Getting down the track was one thing, but watching your competetor at the same time was thier "home field advantage". Good news is we had a Great Time and brought the '66 home safe and sound. Maybe we're just spoiled? The CalTracs and monoleaf springs worked very well even with grass growing out of the launch pad. Did I mention the foot high rise in the track surface at about 80' out? That was fun, and the right lane was a "lazy S" if you wanted to stay in the groove and avoid a huge gouge with your right slick? Good stuff, reminds me of some of the outlaw tracks in the south. But overall the people were great and they are trying to raise 100,000 dollars for the repaiving project. I hope they do, and FWIW there are some very good bracket racers in Samoa. (When I first heard of Samoa Dragstrip, I thought it was in Hawaii) But no it's in California, one of our oldest tracks which started in 1955.

Check it out at www.samoadragstrip.com

SteveW

quote:

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Originally posted by steve'66:
Thanks for the tips!

The car ran 11.28s on the primaries only and still pulled the front wheels 6"s off the ground with 425 cfms.

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Don't you just love restrictor racing!!? I have to run on half a 750 to keep mine out of the 11.s

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SCOOP

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc.

The '60s were 1.48-1.50 on two barrels.

I'd take that bet! If you think about it the manifold vacumm is highest at idle and falls to 0 at w.o.t. If something was going to suck the secondaries open it would be manifold vacumm and it would do it at idle. And, no the secondaries weren't wired closed. We checked with no load reving it up to 5,000+ and they didn't open. It's kinda dangerous to check at w.o.t. under a load though. LOL

KV,

I'd guess that your C wasn't consistant on 2 barrels because your combo is tuned and geared and the torque converter stalls at high rpm. The lack of cfm's hurts top end power more than bottom end power. So your engine wasn't producing the torque where the converter wanted it. A mismatched combo won't be consistant.

What do you think? Am I all wet? BTW, the ported vacumm (above the butterflies)increases with load.

quote:

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Originally posted by SteveLaRiviere:
I'd bet that vacuum was still pulling your secondaries open a small amount.

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I think SteveW is right. If that was true, a vacuum secondary carb wouldn't need a booster diaphram to pull itself open. All you would need is a control spring.

As I said in an earler post about disconnecting the secondaries to slow the car down, you have to wire the secondary throttle plates closed or they will get pulled open when the primaries are open just because of the air demand of the engine. That is similar to how the Quadrajunks and Carter AVS carb secondaries work.