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Why does tunnel ram work so good on BBmopar not others?

Posted By: 2boltmain

Why does tunnel ram work so good on BBmopar not others? - 12/19/08 01:00 AM

So why does the tunnel ram work so well on the mopar B and RB but not on others? Dork I knew ran one on his BB chevy pro street camaro and said it would lay down till about 4000rpm and then scream. I had an M1 tunnel ram on a Challenger with 2 500cfm ebrocks. 509 cam and a 10 to 1 shortblock. The thing made power all over. Is it because mopar heads are a velocity torque head? As far as I know small block mopars do not benefit from a T ram like the big blocks do.

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Posted By: RapidRobert

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 03:56 PM

just keep smiling
Posted By: MLR426

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 04:40 PM


Your ready for a new perm.

logan426
Posted By: 2boltmain

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 06:07 PM

I know you guys like my Rob Wolfe-ish wig but what about the tunnel ram question? What do people in the know have to say?
Posted By: bobby66

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 06:15 PM

Grumpy Jenkins did ok with a tunnel ram.
Posted By: AndyF

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 07:10 PM

Well your average BB Mopar has intake runners that are about the same size as what was used on a SB Chevy. So my guess would be that the high velocity intake ports work okay with a tunnel ram.

The Max Wedge cross ram is basically a tunnel ram that has been laid over on it side. Those work okay for certain engine combinations too but I don't think they work quite as well as a real tunnel ram.
Posted By: Supercuda

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 07:16 PM

Quote:

Dork I knew ran one on his BB chevy pro street camaro



I think "Dork" is probably the answer and not the tunnel ram. Who knows how well matched the combo was, or how well tuned.
Posted By: Stanton

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 07:47 PM

I've had tunnel rams on both a 383 and a 440. Both were dogs at low RPM and forever backfired and blew powervalves in the carbs. I think the 383's issue was a poor cam selection. Neither of them would start without first wearing down a battery. Could never figure if it was a lack of fuel or flooding !! I've had enough of tunnel rams. Can't beat the visual impact though !!!
Posted By: Dragula

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 08:15 PM

Dunno....

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Posted By: CrAzYMoPaRGuY

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 08:18 PM

Quote:

I've had tunnel rams on both a 383 and a 440. Both were dogs at low RPM and forever backfired and blew powervalves in the carbs. I think the 383's issue was a poor cam selection. Neither of them would start without first wearing down a battery. Could never figure if it was a lack of fuel or flooding !! I've had enough of tunnel rams. Can't beat the visual impact though !!!



Wow.
Not trying to be mean or anything, but you had issues that were easy to solve.

I've ran 2x4bbl tunnel rams on TONS of vehicles, my Demon was driven year round, in the snow, in the freezing cold, whatever. Started first crank every time, drove like a dream even when cold started.

My work truck was a tunnel ram 2x4bbl- as was my wife's daily driver, for years and years.

I strayed the course when I bought my Jensen Interceptor, it will be a first for me- I went with a lowrise 2x4bbl Edelbrock #5440 (CH28) and two Edelbrock 500s.
I've never ran a lowrise dual quad before, but I want everything under the hood...
Posted By: jbc426

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 08:20 PM

Is that a Mullet?
Posted By: roadrunninMark

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 08:21 PM

Damn Dragula, love that one on the left! What is the setup on that one?

Mark
Posted By: 2boltmain

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 10:21 PM

Yes that is a PowerMullet wig I wore for Halloween. Even Weiand does not recommend their tunnel ram on a street driven 440. Sure would have been interesting to see how well the Offenhauser T ram would have done with 2 Holley carbs in that magazine dyno shootout some months back. The Weiand cleaned house.
Posted By: CrAzYMoPaRGuY

Re: Why does tunnel ram work so good on BBmopar not others? - 12/19/08 10:27 PM

Quote:

Even Weiand does not recommend their tunnel ram on a street driven 440.



I guess I should taken the rep for Weiand out for a ride in my work truck.
Stock stall converter, I could roast the tires while pulling a trailer WITH a car on it...?




Drove it every day, loaded it, towed with it, is was just as drivable as any truck with a carb.


Posted By: Twostick

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 01:44 AM

The reason I've been told they work so well is that the runners are about as close to an ideal length as you can get with an OOTB intake. This is from Don Dulmage's website http://www3.sympatico.ca/big-d/index.htm

" Tuned length of an intake runner.
Runner length is not an exact science because of the variables involved but a rule of thumb formula I often find handy for sorting out manifolds is from Philip H Smith (Tuning For Speed) It states that:
the intake runner should be approximately equal to 90 divided by the RPM in thousands
or
90/rpm in thousands = length in inches

ie for 6000RPM 90/6 = 15 inches

ie for 7000RPM 90/7 = 12.85 inches.

The measurment is taken from the intake valve to the plenum area. If your current 440 Mopar manifold seems too short now for your RPM range you're beginning to get the picture. "

CrAzYMoPaRGuY if you read the 2x4 section of the site he especially likes the 6pak Weiand T-Ram that he converted to 2x4 which looks like the one you have. Lots of good budget minded info on the site.

Kevin
Posted By: CrAzYMoPaRGuY

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 03:24 AM

Quote:


CrAzYMoPaRGuY if you read the 2x4 section of the site he especially likes the 6pak Weiand T-Ram that he converted to 2x4 which looks like the one you have. Lots of good budget minded info on the site.

Kevin



LOL Good eyes. That's exactly what mine was.
Posted By: ScottSmith_Harms

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 03:41 AM

I used to think a dual Dominator equipped Hemi was the coolest TR setup you could run, but I'm thinking this out does those, at least in the awesome/primitive/cool department!

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Posted By: Twostick

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 04:01 AM

Hard to find reasonably priced.

Kevin
Posted By: bacaruda

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 04:25 AM

A little off topic, not much, do the STR's work as good?
I'd love to EFI one with a single TB.
Jim.
Posted By: quickd100

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 11:05 AM

I pump the carbs a couple times and hit the key and it's running. It runs like a million bucks hot or cold weather. 528 hemi, Weiand TR with 2 850 thermoquads. Dave
Posted By: BDS871Cuda

Re: Why does tunnel ram work so good on BBmopar not others? - 12/20/08 02:50 PM

Quote:

As far as I know small block mopars do not benefit from a T ram like the big blocks do.




Back in '87 I ran an Edelbrock t-ram on the '67
Cuda. Little 340 with 10 to 1 and the Lunati
BR II cam, only .480 lift, 234 at .050 and ported
lightly 340 X heads. Two Holley 450 carbs.
Power range was 3000-6000 rpm and was real nice
to drive on the street. I could drive 150 miles
one way to Cedar Falls Raceway in Iowa and run
12.20's in street trim. Worked good 22 years ago
and they still work good today, all in the setup.

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Posted By: AndyF

Re: Why does tunnel ram work so good on BBmopar not others? - 12/21/08 01:47 AM

Can't beat that old school look.

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Posted By: 8_Barrel

Re: Why does tunnel ram work so good on BBmopar not oth - 12/21/08 05:24 AM

Interesting read that delves into theory & practice.

Ram Tuning

Posted By: rjones

Re: Why does tunnel ram work so good on BBmopar not others? - 12/21/08 04:13 PM

Back in the late 70s and early 80s I ran an Edelbrock str14 (tunnel ram with layed down runners) with a single TQ (tried some holleys too, they ran about the same) on an 11 to 1 440 in a 68 barracuda four speed car, 4.56 gears, hooker 1 7/8 fenderwells. Cam was in the 540 lift range, can't remember the duration. It would always start and run well and I street drove it almost every day I had it. It produced tons of low end and midrange torque. Ran out of breath around 6000 rpm. Would run around 11.10s and that was at 3000 ft elevation.

I have an article in the 2008 spring issue of hot rod do-it-yourself engines series magazine where they tested 18 different intake manifolds on a B engine mopar. It included an edelbrock str15 (the low block version of the str14) and it produced only average performance. I was surprised to see this since it seemed to work well on my 440 barracuda, maybe it's runner lengths and sizes are more suitable for 440. In this magazine article the clear winner seemed to be the weiand hi-ram tunnel-ram with the greatest torque and highest horsepower #s by a significant margin. Another intake that seemed to stand out as a good street performer was the dual plane edelbrock performer rpm.This article is a good read, find it and read it if you can. Interesting stuff.

Roger
Posted By: ScottSmith_Harms

Re: Why does tunnel ram work so good on BBmopar not others? - 12/21/08 04:34 PM

Hey QuickD, what are the numbers on your TQ carbs?
Posted By: ProSport

Re: Why does tunnel ram work so good on BBmopar not oth - 12/21/08 09:00 PM

My old DartSport had an M1 single plane and 1050 Dominator running in the 10 flat range with a best of 9.96 on a real cold day.
I switched to an M1 low deck tunnel ram with 2 750 Quickfuel carbs and the car was a whole new animal. It started and idled better in any kind of weather as long as it was over 35 degrees. Ran consistant 9.90's with a best of 9.88. Footbraked to a 1.36 60 foot, this was an 11 to 1 compression 451 with the MP 590 purple shaft solid cam.

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Posted By: Rug_Trucker

Re: Why does tunnel ram work so good on BBmopar not oth - 12/22/08 06:11 AM



Posted By: quickd100

Re: Why does tunnel ram work so good on BBmopar not others? - 12/22/08 11:13 AM

Quote:

Hey QuickD, what are the numbers on your TQ carbs?



If you don't mind I'll look tonite or tomorrow. It's -10 and my mess is out in the garage. I just don't remember off the top of my head. I have milled the airhorns off and installed replaceable bleeds on everything. I'm guessing they flow well past 900cfm each. Dave

It was -20 when I went out to start my work truck this morning.
Posted By: 2boltmain

Re: Why does tunnel ram work so good on BBmopar not others? - 12/22/08 03:11 PM

In the early 90s Edelbrock made a "Street" tunnel ram for mopar small block. It was not as tall as a Weiand or the early Edelbrock units. They only made them a few years.
Posted By: DJVCuda

Re: Why does tunnel ram work so good on BBmopar not others? - 12/22/08 07:17 PM

Quote:

In the early 90s Edelbrock made a "Street" tunnel ram for mopar small block. It was not as tall as a Weiand or the early Edelbrock units. They only made them a few years.



thats what I run

everyone says my car should be a pig...
basic stock 360
mopar 474 lift cam
stock small valve heads
3.23 gears
eddy street ram w/ 2 holley 390's

I get 16 mph highway ( driven all over even in the rain)
run 12.56 @ 106 in the quarter ( 1.74 60' time )

I ran a stock cast iron intake on my car and a holley 780 it ran 13.2 @102 w/ 1.86 60' times
so the t-ram does work!

never have any driving problems with the t-ram, aside from looking at it shake in front of you at idle you would not even know its there..till ya step on it
Posted By: RapidRobert

Re: Why does tunnel ram work so good on BBmopar not others? - 12/22/08 08:52 PM

Quote:

everyone says my car should be a pig...
basic stock 360
mopar 474 lift cam
stock small valve heads
3.23 gears
eddy street ram w/ 2 holley 390's

I get 16 mph highway ( driven all over even in the rain)
run 12.56 @ 106 in the quarter ( 1.74 60' time )

I ran a stock cast iron intake on my car and a holley 780 it ran 13.2 @102 w/ 1.86 60' times
so the t-ram does work!

never have any driving problems with the t-ram, aside from looking at it shake in front of you at idle you would not even know its there..till ya step on it

That makes me want to try one out
Posted By: quickd100

Re: Why does tunnel ram work so good on BBmopar not others? - 12/22/08 10:38 PM

Scott; The back carb is a 6322 and the front carb is a 6545. I've worked them over so they're a matched set now. Dave
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