New tunnel ram top

I built this dual 4 Barrel tunnel ram top with sheer plates. What are your thoughts how it will work? For a 800 HP W7 small block

Try it and let us know your results
Good luck, it looks really good

very NICE fab work !
as Cab said, please let us know how it works !

Looks nice Mike!

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.

Reversion plates are worth some HP on engine dyno tests I've done

From what I can see everything 'looks' right. Are the runners optimized to your application? Regardless, if you've converted a single 4 top to the dual top, I'd say that'll show some measurable gains! The anti-revesion plates as has been mentioned will help too. What's going on top of those???

Got two APD 950s coming ...before i was running a single 1200 on this tunnel ram

Nearly every time I see or hear 'sheer plates' I assume 'ANTI-REVERSION' is what was meant but, I'd be wrong. I'd pop for a good pair of anti-reversion plates (for a number of reasons) and make whatever mods are necessary to fit those. In my experiences, 'those' will almost certainly show improvement on 'line-of-sight' runner orientation configurations. Wilson are the one's I've seen and used but there are others that are THAT STYLE that'll work. Other brands just don't come to mind ATM.

So what is the difference between sheer plates and anti reversion plates? On Wilson manifolds website I see nothing that's said anti-reversion plate

They are the same thing from what I have been lead to believe. Any others I refer to as a transition spacer. I took this information from a podcast or video with Darin Morgan. I figure he knows more than I do.

I will attach some examples, hopefully it works

Open transition for a shear plate

4 hole transition spacer

Shear/Anti Reversion Plate

This is the type of insert I referred to earlier

The extended cones do a good job keeping direct pulses from 'talking' to the carbs, that is the specific type I was mentioning. Thanks for the pics Alan.

This is the shear plate i'm using on top of my tunnel ram

I did the same with my top. I also made white nylon spacer for heat dissipation on the street. If you look closely you can see it sandwiched in there.

Looks good

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.

This is the top finished on an Indy intake

nice work LA.

[quote=Cab_Burge]Try it and let us know your results :up
Good luck, it looks really good [/quot


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

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

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!

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.

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

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?

No

Cool, just saw a reference to some APD carbs too.