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Re: New tunnel ram top [Re: Plymouth340] #3006597
01/18/22 07:40 PM
01/18/22 07:40 PM
Joined: Jan 2003
Posts: 6,130
Melbourne , Australia
LA360 Offline
master
LA360  Offline
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Melbourne , Australia
Originally Posted by Plymouth340
Originally Posted by LA360
All the tunnel ram intake tops I've seen have a 3D machined insert that the shear plate fitted on to. They usually just featured a radius to transition from the carb to the plenum.


How many different things are you going to try? A sharp edge, versus a radius or taper on the plenum side below the carb? Plenum spacers?

I made this for a friend in 2014, I am still waiting for it to be tested (the customer had some personal issues). No idea if it was good, bad or otherwise.

20140911_100307.jpg

Alan Jones
Re: New tunnel ram top [Re: LA360] #3006598
01/18/22 07:41 PM
01/18/22 07:41 PM
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Posts: 6,130
Melbourne , Australia
LA360 Offline
master
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This is the top finished on an Indy intake

IMG_20141018_113822.jpg

Alan Jones
Re: New tunnel ram top [Re: LA360] #3006781
01/19/22 01:23 PM
01/19/22 01:23 PM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder
nice work LA. up
beer

Re: New tunnel ram top [Re: Cab_Burge] #3056246
07/05/22 01:06 PM
07/05/22 01:06 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
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CEDAR RAPIDS
[quote=Cab_Burge]Try it and let us know your results wrench :up
Good luck, it looks really good bow up [/quot


\ It picked up a tenth in 1/4 .......8.90 @ 153

20220616_133440[1241].jpg
Re: New tunnel ram top [Re: Plymouth340] #3056416
07/05/22 05:51 PM
07/05/22 05:51 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Originally Posted by Plymouth340
[quote=Cab_Burge]Try it and let us know your results wrench :up
Good luck, it looks really good bow up [/quot


\ It picked up a tenth in 1/4 .......8.90 @ 153 bow up Thanks for sharing that information!









Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: New tunnel ram top [Re: Cab_Burge] #3056420
07/05/22 05:58 PM
07/05/22 05:58 PM
Joined: Mar 2005
Posts: 1,402
Chesterfield Twp. Mi.
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John Burdine Offline
pro stock
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Chesterfield Twp. Mi.
a tenth at that level is nothing to sneeze at.

Re: New tunnel ram top [Re: John Burdine] #3056472
07/05/22 09:17 PM
07/05/22 09:17 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
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Originally Posted by 493_john
a tenth at that level is nothing to sneeze at.



ya very happy with the APD Carbs.....never had to touch them out of the box

Re: New tunnel ram top [Re: Plymouth340] #3056555
07/06/22 08:58 AM
07/06/22 08:58 AM
Joined: Jan 2003
Posts: 4,003
Shelby Twp. Mi
HardcoreB Offline
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Nice! Can you give us some details of the car/engine? What were your incrementals? At 153 MPH there's probably more ET in it too!

Re: New tunnel ram top [Re: HardcoreB] #3056655
07/06/22 12:45 PM
07/06/22 12:45 PM
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Posts: 19,304
Las Vegas
Al_Alguire Offline
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So there were more changes than just the top of the manifold?


We made these tapered plates for tunnel ram set ups last year. Did a little testing on the Stratus and saw some improvement but did not have time to fully flog on them. Maybe on the dyno one day.

[Linked Image]


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: New tunnel ram top [Re: LA360] #3056831
07/06/22 05:55 PM
07/06/22 05:55 PM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline
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Originally Posted by LA360
This is the top finished on an Indy intake


If I could buy a top like that, I would probably go with an Indy TR....


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: New tunnel ram top [Re: Dragula] #3057302
07/07/22 10:42 PM
07/07/22 10:42 PM
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DFW
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mr_340 Offline
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Do the shear plates have the ribbing to shear off the fuel from the walls?

It appears the anti-reversion plates have a trough around the openings to reverse the direction of flow.

The other ones posted look like a diffuser style with a tapered opening. A pressure recovery like the downside of a venturi.

Does that summarize the differences?


Floyd Lippencott IV
Re: New tunnel ram top [Re: mr_340] #3058043
07/10/22 07:57 PM
07/10/22 07:57 PM
Joined: Jan 2003
Posts: 6,130
Melbourne , Australia
LA360 Offline
master
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Melbourne , Australia
Originally Posted by mr_340
Do the shear plates have the ribbing to shear off the fuel from the walls?

I don't know exactly as to what is going on, whether a boundary layer is being created or whatever. Some spacers will have a smooth tapered surface, others are machined with steps. Everyone has a different way of thinking. In many cases, I believe it comes down to what might be easy to machine, or as silly as it sounds, what is visially appealing to the purchaser.

"It appears the anti-reversion plates have a trough around the openings to reverse the direction of flow."

Most that you see will have that trough or groove that you are refering too. I have been meaning to test without it, or adding a pocket instead

The other ones posted look like a diffuser style with a tapered opening. A pressure recovery like the downside of a venturi.

I think Darin Morgan described them best, by refering to them as transition spacers. A means of transitioning from the carb to the manifold

Does that summarize the differences?


Alan Jones
Re: New tunnel ram top [Re: Al_Alguire] #3058738
07/12/22 11:36 PM
07/12/22 11:36 PM
Joined: Feb 2006
Posts: 501
CEDAR RAPIDS
Plymouth340 Offline OP
mopar
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CEDAR RAPIDS
Originally Posted by Al_Alguire
So there were more changes than just the top of the manifold?


We made these tapered plates for tunnel ram set ups last year. Did a little testing on the Stratus and saw some improvement but did not have time to fully flog on them. Maybe on the dyno one day.

[Linked Image]


No

Re: New tunnel ram top [Re: Plymouth340] #3058896
07/13/22 01:40 PM
07/13/22 01:40 PM
Joined: Jan 2003
Posts: 19,304
Las Vegas
Al_Alguire Offline
I Live Here
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Las Vegas
Cool, just saw a reference to some APD carbs too.


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
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