Tunnel Ram Based Blower Intakes...

...you've seen these around, right? I think Dyer's made a couple different application's, and several companies sold plates to weld to single-quad intakes or tunnel ram base's...

...do they "work"?...seems like all "real" blower intakes have a plenum chamber right below the blower, for the air and fuel to mix, before entering the runners and into the ports...

...but on those tunnel rams with the plate attached, it's right into the runners, and down the ports. Doesn't that effect the mixture?...or am I worrying about it too much?

 

the blower over comes any loss.... so you get 49% instead of 50% increase in torque

 

Mixing is done with the rotors.

What kinda oddball engine you wanting to huff?

 

Boost overcomes all obstacles.

The plenum is necessary to keep the manifold low, you can't make the runners straight in a setup that low, the height of a tunnel ram bottom makes it OK.

Whatcha working on, a Ford?

 

I bought some old, NOS, Weiand & Offy, tunnel ram bases, (VERY cheap), with no tops, all small blocks, Chevy, Ford, & Mopar, and was thinking about building blower intakes out of them...

 

The money in those would be throttle body flanges and injector bungs. Just my 2 cents. Good luck with the venture.

 

A buddy runs a dyno shop here in town, and as a promotion, one of the Bigfoot trucks was there one day. They were running a blower on top of a tunnel ram intake, this was a BBF. I never asked the guy about it but i thought it was pretty interesting. I don't know if it's old tech, or new tech, or tech that just works, but it's still done today.

 

Very common on big Fords, so you can put the distributor in without interfering with the drive.

 

sounds interesting - specially since the blower manifold is the expensive part (what ive found) for mopars anyway - be interested to see what ya come up with and what you end of wanting to get for one of your sbm's for sure!

 

Shifty...do you mean as in an EFI conversion?

 

Yeah man, you don't have to know efi. Poke around enough to figure out a couple of common throttle bodies and injector bungs are pretty universal. I might be temped to add NOS bungs too.

Upon further reflection, a raised blower would be like rat rodder gold. Hard to go wrong with that plan. It'll be a neat scheme either way. Good luck

 

Been looking into makeing one of those for my bbc in my Hondo drag boat. Should act like a small intercooler. Cant use it in my modelA want see out the windshield(lol) As soon as I get a victor base for my BBC in the boat my neighbor is gonna machine the plate for me. Here is a pick of my friends tbucket with one he is doing and some other picks I have collected.

 

Hampton did the nice polished ones.

 

'Back in the day' the ford didn't have a cast blower intake like GM & Chrysler. A few people (we got ours from Hampton) made them from tunnelram intakes and they worked pretty good. Blower belts was an issue, they were about 10' or so.
It made for a tall package.

 

Obviously this is a tried and true deal, but I gotta ask are there any weird leverage or vibration type issues putting it up that high?

Or is this really any higher than a traditional blower intake with an intercooler plate sandwiched in?

 

The rotors act as a centrifuge, and at high speed the larger fuel droplets are separated out and follow a different path than the lighter air and completely vaporized fuel - it doesn't help.
The discharge at the bottom of the blower case is nothing like symmetrical - most of the air is released at the front of the case, so unless there's a plenum to permit some re-balancing the front cylinders get more air.

 

Yea most of the ford intakes are tunnel ram style to clear the dizzy and they work great.

 

If the plenum is very large, it will take the odd second or 2 to pressure it before you see boost in the cylinders. The engine will also not drop off when the throttle is closed until the pressurized volume has been consumed.

 

My 6V71 on top of a custom tunnel ram and Offy crossram adapters.

 

Rotofaze made an individual runner "ISO PORT" manifold that did not have a plenum. Problem was the rotation of the "helix" rotors tend to throw the fuel forward and proper distribution cant happen. BUT--- they do make STRAIGHT 2 lobe rotors that would evenly distribute the mix down, you just have to spin them a bit faster. Unless you pulled the top off the case, to have a look-see, no difference in the outward apperence

 

Does a Smokey Ram count?

 

The blower is not too concerned about a plenum it just wants a place for the air to get out. It is really just a screw compressor.

I have seen 'em. They function and the blower gives you a place for the injector hat. LOL

 

Look at this thing. It's an 18:71. Not one of those sissy NHRA blowers. The opening to the manifold is way in the front. Long way to the back of the rotors, Seemed to work great

 

As a caution, if you try to run serious boost, the blower mounting flange will bend if the unit doesn't have side braces on it. At street levels, I don't know if this is a concern or not but at 30 lbs for a race engine, it needs to be very substantial. When the flange bends, all the boost goes out the rear.

 

I'm bringing this back up from the dead...

I'm looking to bolt my polished Weiand 8-71 to a tunnel ram base for my SBC. I'm building a street freak style *non HAMB friendly* and I like the attitude and the altitude of the tunnel ram look. Can anyone provide some insight/suggest parts regarding the easiest way to get this done? I've reached out to Hampton blowers about their setup, but no response yet.

 

^^^^ nothing new things like this have been done since the 50s , what's your specific question ,One will be $ , you will have to experiment with a tall intake running carburetors because the front cylinders can run leaner than the rear cylinders, with mechanical injection and EFI easier to fatten up front cylinders ,you will need a longer belt than normal, & possibly a snout support depends on the intake being used

 

Engine Masters did a dyno test on theirs and there's several guys in this group that have built them
https://www.facebook.com/groups/402482016846724/?ref=share

.

 

I guess my question is, what's the path of least resistance? Does the intake have to be made or does someone produce it that I just can't find? I already have the complete blower setup and two new boost referenced Holley 650s waiting. I guess I need to do some more of my own research.

I'm going to watch this now. Thanks!

 

Blowers on "Stilts"!

 

Any blower manifold you might use needs to have a popoff valve....On cold mornings engines to tend to backfire.....