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  #711  
Old 11-14-2018, 08:42 AM
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Headers look great!!!!!!!!!!!!!!!!!!
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  #712  
Old 11-14-2018, 10:17 PM
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Well Bob, nice to hear that the converter sleeve can be repaired, that converter will make a big improvement to your leave & 60' time witch will lower your overall ET number.

I think the idea of unbolting the plenum top plate and dropping in some wood blocks to reduce the overall plenum to 150 - 160 cu in for a test start up is a easy thing to do.

The coated headers look real nice. Will the EFI tubes and the plenum be coated the same when it is ready to run? The old dragster will be looking sharp & pulling hard this spring.
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  #713  
Old 11-14-2018, 10:51 PM
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Quote:
Originally Posted by Old Iron View Post
The thing I see with the intake is, it has too much volume in the plenum.
The fuel flow looses it's velocity between the base of the carbs and runners into the head causing the fuel to de-atomize before entering the runners.
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I think the idea of unbolting the plenum top plate and dropping in some wood blocks to reduce the overall plenum to 150 - 160 cu in for a test start up is a easy thing to do.
I don't want to beat up on you any further about the manifold, but I think the guys may be onto something with the large plenum volume, it looks big block size to me. I know you have the top plate done but have you considered turning the carbs 90 degrees so the throttle bores are in line with the intake runners? New throttle linkage needed tho.. Distribution may be improved with a straighter shot to the runners and it would allow further narrowing of the plenum to test the theory of less is more.
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  #714  
Old 11-17-2018, 12:33 AM
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Hmmm, this guy's making a very similar manifold,
with the carbs turned to run inline with the ports, small plenum.

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  #715  
Old 11-17-2018, 12:50 AM
bob w bob w is offline
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zz, That manifold was made by The French Town Flier. He's the person that advised me to build mine the way it is. I did not hear from him directly. Old28 (Tom) here on UDS stays in contact with him and relays all his expertise to me. The unit you see is for a street application. He suggested mounting the carbs in the traditional orientation so the float bowls don't spill over under hard acceleration. Hopefully the dragster will accelerate hard eventually. He also spec'd the plenum volume. The carbs are so simple I can't see how I could have messed them up when rebuilding.
Sometime this winter, when I get the converter back and reassemble the car I'll put the Clifford 4 barrel manifold on and adapt it for one two barrel. I can test both two barrel carbs, one at a time and see if they are or are not the problem.
If the carbs are okay I'll try a smaller plenum by stuffing something in there to take up some of the volume.
Thank you , and others for your interest and suggestions. We'll get it figured out eventually.

Last edited by bob w; 11-17-2018 at 10:38 AM.
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  #716  
Old 11-17-2018, 02:07 PM
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OK guys, I am Bob's friend old28 and I want to add a little more to what bob said. Just like bob I had a stroke a few years ago that affected how I can handle figures, very depressing for a guy that drag raced (Front Motor Dragsters for over 45+ years. I have talked to FTF about Ford 300 inline 6 motors for the past few years. He has been drag racing two altered roadsters with 300 inline 6 motor, both with plenum intakes, one with dual 2100 carbs and the other with three 2100. In trying to get bob's setup to work I went over the plenum problem with him again.

For a race motor (inline 6 300") he recommends 60% of the motor cu in or about 180 cu in plenum volume with a two or three 2100 carb setup. When a few of you suggested 150-160 you were right in the park. After reviewing the past information it was clear to me that I missed the 60% figure and that is why bob's plenum is 294 cu in.

I think bob has a good plan for testing the carbs and wood blocks in the plenum will work fine for a volume reduction test. I am with bob, we will get it figured out and this plenum / dual 2100 carb setup will help get the dragster into the high 10's.

Sorry for the rant but it's all good.
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  #717  
Old 11-17-2018, 10:56 PM
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Obviously you fellas are on the right track, I thought when I came across that manifold pic that it was amazingly similar, now I know why. I'm sure you'll get it sorted - must be tougher to do testing and changes when you can only do it 1/4 mile at a time, combined with the pressure, excitement and time constraints of running at the drags! Anytime I took one of my cars to the track (mid 1970's), my biggest enemy was adrenaline and nerves at the tree, fear of blowing the 2-3 shift and scattering a Muncie 4 spd, etc., and not being able to drive it home (and to work on Monday!) Always scheming on mods to do before the next weekend and gain a tenth. Wouldn't have missed it for the world..
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  #718  
Old 11-18-2018, 12:02 PM
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It looks like you guys have it handled
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  #719  
Old 11-18-2018, 08:03 PM
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Well lets hope so as I am on a quest to help get the Bullet into the high 10's, this is the main reason bob dropped the Ford 300" into the dragster. That new higher stall converter along with the dual carb Plenum will help a bunch. After years of drag racing you will try a change, test it, modify it and start all over in the quest for speed.

As for cutting good lights on the tree you would have to talk to my wife Dixie, my lights are closer to my age of 73, her's have 0 or double 00. She ran our NE-1 blowen Alcohol Front Motor dragster for 5 years. Bob has seen the picture I have attached. Taken at top end Bakersfield, CA.
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  #720  
Old 11-25-2018, 03:45 PM
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Much love and respect for you and Dixie, Tom. However, I didn't take your advice. Took the top off the manifold and couldn't stop myself from modifying it. I smallened it (is that a word?) and put some internal sheet metal pieces in it to reduce the volume. Got the perimeter mounting flanges done. Now have to cut the top plate down. Almost out of gas so it is only tacked together. Plenum is now about 140 cu. in. and can be increased by 25 cu. in. by adding a 1/4" spacer all around.
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File Type: jpg Intake and Tank 001.jpg (115.3 KB, 14 views)
File Type: jpg Intake and Tank 002.jpg (115.5 KB, 15 views)
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