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  #16 (permalink)  
Old 03-31-2011, 02:00 PM
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Quote:
Originally Posted by Leoman
I have a lot of overlap, no idea about reversion
In a very dark area, remove the air cleaner and fire the motor. Shine a very strong flashlight across the top of the carb. The standoff you see as a fog lurking around the top of the carb is standoff (reversion) caused by the long cam timing. The piston coming up the bore with the intake valve still open will push the mixture back up the intake tract and you can see it this way.

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  #17 (permalink)  
Old 03-31-2011, 08:02 PM
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Quote:
Originally Posted by 001mustang
cool.

how did you measure hood clearance? play dough?
Couple pieces of cardboard. It was that close. I originally measured it by getting a couple of gouges in my hood. I now have two little bumps in the middle of it, visible only in the right light (or from the driver's seat) to remind me never to take anything for granted

Play dough is a good idea!
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Old 04-02-2011, 10:01 AM
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I played around with spacers for a while. The tappered four hole still get's my vote, and it will stay on my setup.


I tried this gimmick four hole once, great for off the line torque and it even cured a few cruising issues too. It also helped with MPG. This spacer would be great for your car show cruiser that never see's above 3k rpm going from the garage to the cruise in. It made the higher rpm fall flat, and it lost some ***.





I even double stacked a 1" four hole on top of a 1" open on a RPM Air-Gap. It worked fine, felt like it really picked up the acceleration above 3500rpm



But, so far the tapered spacer flowed into the dual plane in my previous post is providing the best results. It even feels faster on the street than the big runner single plane I ran for almost a year.
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Old 04-02-2011, 01:03 PM
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so do the open spacers not work well on a dual plane manifold?? should i go with a 4 hole spacer for my rpm air gap?
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Old 04-02-2011, 10:19 PM
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Quote:
Originally Posted by JCurry
so do the open spacers not work well on a dual plane manifold?? should i go with a 4 hole spacer for my rpm air gap?
Dual planes are something of a mystery to me I must admit. I would think that either style might help depending on the motor. I never did like having to tune the two halves of my carb like a pair of 2-barrels, so a short (1/2") open spacer would be the first thing I'd try. But I don't see why a 4-hole wouldn't do the same thing theoretically that it does on a single plane, i.e. lengthen the barrel for better flow, etc. I realize that the plenum floor on one side of a dual plane is deeper down than the other. This stuff can drive you nuts. I'd try both! Why not? It's such an easy and generally cheap mod, and it's fun to experiment. 04Silverado seems to have a good hint above with his tapered spacer that has the properties of both open and 4-hole (plus more).

04Silverado, I bet the Vortech or Procharger or whatever that is feeding the carb helped a lot too Nice photos!

Inspector, thanks for that cool test. I'll try that before I try the tapered spacer.

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Old 04-03-2011, 07:39 AM
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Carb Spacers...

Hi,years ago,i had a HOLLY carb,that would run fine when it was cold,when it got warm,it would die,(heat soak) an old man told me to make a carb spacer out of wood,i laughed,tried it,and no more heat soak,the wood spacer acted as an insulator.
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Old 04-03-2011, 09:14 AM
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Quote:
Originally Posted by Leoman
04Silverado, I bet the Vortech or Procharger or whatever that is feeding the carb helped a lot too Nice photos!
No force feeding here, naturally aspirated. The carb hat & tubing you see were part of the ram-air set up grabing air from the front of the truck
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Old 04-03-2011, 01:12 PM
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Carb Spacers

As long as we're talking carb spacers, how about this? Has anyone run a drop base aircleaner so they could keep a 3" or larger filter and still add a carb spacer? That's a lot of curve for the air to follow.
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  #24 (permalink)  
Old 04-03-2011, 06:29 PM
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Quote:
Originally Posted by Rineholio
As long as we're talking carb spacers, how about this? Has anyone run a drop base aircleaner so they could keep a 3" or larger filter and still add a carb spacer? That's a lot of curve for the air to follow.
Yep, and it's not a problem if you use a correctly designed dropped base. I use a 4" filter with a 1" open spacer and a950 holley on a Super Victor and it fits under the stock hood of a '72 Nova.

The very best is the original GM/Chevrolet design for the L-88 Corvette. GM did a bunch of testing to insure no power was lost in this air cleaner. This base is available from several resto parts suppliers. There are also a few good ones made for the Circle Track market.

Many of the generic chrome drop base air cleaners are not as good however.
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Old 04-03-2011, 09:01 PM
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I run a Moroso drop-base cleaner. I tried switching to a chrome Holley and found myself with two little gouges in my hood after things expanded from operating heat! The Moroso is back. It's painted Rustoleum grey. It uses a 3" filter and seems to get plenty of air. It really is about 1/8 to 1/4" shorter than the Holley, which one would think was plenty short. It is, but not for me I guess.
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