Re: New tunnel ram top
[Re: Plymouth340]
#3006597
01/18/22 07:40 PM
01/18/22 07:40 PM
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Joined: Jan 2003
Posts: 6,150 Melbourne , Australia
LA360
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Posts: 6,150
Melbourne , Australia
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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.
Alan Jones
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Re: New tunnel ram top
[Re: Cab_Burge]
#3056246
07/05/22 01:06 PM
07/05/22 01:06 PM
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Joined: Feb 2006
Posts: 501 CEDAR RAPIDS
Plymouth340
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mopar
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[quote=Cab_Burge]Try it and let us know your results ![wrench wrench](/ubbthreads/images/graemlins/custom/wrench.gif) :up Good luck, it looks really good ![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif) [/quot \ It picked up a tenth in 1/4 .......8.90 @ 153
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Re: New tunnel ram top
[Re: Plymouth340]
#3056416
07/05/22 05:51 PM
07/05/22 05:51 PM
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Joined: Aug 2003
Posts: 43,332 Bend,OR USA
Cab_Burge
I Win
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I Win
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Posts: 43,332
Bend,OR USA
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[quote=Cab_Burge]Try it and let us know your results ![wrench wrench](/ubbthreads/images/graemlins/custom/wrench.gif) :up Good luck, it looks really good ![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif) [/quot \ It picked up a tenth in 1/4 .......8.90 @ 153 ![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif) Thanks for sharing that information!
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: New tunnel ram top
[Re: John Burdine]
#3056472
07/05/22 09:17 PM
07/05/22 09:17 PM
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Joined: Feb 2006
Posts: 501 CEDAR RAPIDS
Plymouth340
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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
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Re: New tunnel ram top
[Re: HardcoreB]
#3056655
07/06/22 12:45 PM
07/06/22 12:45 PM
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Joined: Jan 2003
Posts: 19,386 Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Las Vegas
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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]](https://i.postimg.cc/W1V2Sck8/D0-B5-FAE8-DCE8-459-F-A8-D8-2-EFF9-A7787-DB.jpg)
"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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Re: New tunnel ram top
[Re: Dragula]
#3057302
07/07/22 10:42 PM
07/07/22 10:42 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
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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
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Re: New tunnel ram top
[Re: mr_340]
#3058043
07/10/22 07:57 PM
07/10/22 07:57 PM
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Joined: Jan 2003
Posts: 6,150 Melbourne , Australia
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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
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Re: New tunnel ram top
[Re: Al_Alguire]
#3058738
07/12/22 11:36 PM
07/12/22 11:36 PM
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Joined: Feb 2006
Posts: 501 CEDAR RAPIDS
Plymouth340
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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. No
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Re: New tunnel ram top
[Re: Plymouth340]
#3058896
07/13/22 01:40 PM
07/13/22 01:40 PM
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Joined: Jan 2003
Posts: 19,386 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,386
Las Vegas
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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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