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.

just keep smiling

Your ready for a new perm.

logan426

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?

Grumpy Jenkins did ok with a tunnel ram.

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.

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 !!!

Dunno....

Is that a Mullet?

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

Mark

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.

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

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!

Hard to find reasonably priced.

Kevin

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

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