Allright i have a 63 Unibody with a 302 in it and when i bought it, it had a tunnel ram system on it and i took it off, i never got to hear it run with it on there. Now its got a single carb on it. But i would like to put the tunnel ram system back on there since i have everything and i was woundering what a tunnel ram would really do for performace wise. And what are some bad things about haveing a tunnel ram system.
Thanks...

 

Tunnel ram meant for wot drag racing. You are going to have worse driveability, and it will load up on you as the gas at low speeds wets the walls of the manifold. Get on it and black cloud city.

There are better manifolds now. If you like to fiddle, put it on and report your results....your mileage may vary.

 

So say if i were at a stop sign with it and just take off with it, it will just bog down? And are they good on say the highway at higher speeds and RPMs?

 

Depending on a number of other factors, such as gears, load, etc, from a standing start, it may do ok. Or, it may be very soft until a higher rpm.

In steady state running, that is when I would expect it to "load up" as you are moving very little (relatively) air/fuel through a very large space. As the velocity of the air/fuel slows, and as it hits the walls, bends, etc inside the manifold, some of the fuel comes out of suspension and sticks to the walls. In the worst cases, it pools in low spots. Hit the throttle and speed up the air, and it richens the mixture. Best case, black cloud, worst case, fouled plug, all cases, wasted fuel, some cases a bog or flat spot until the mixture comes back to spec that it'll take off.

All this stuff happens with "wet wall" carbuerted engines, which is one of the many reasons EFI is used now. The large interior volume of a tunnel ram just amplifies it.

 

What size carb should you run on a 302 with a tunnel ram, the tunnel ram has 2 Holley carbs on it but i have no clue what size they are. I want to put the tunnel ram back on there but im affraid i will not be able to have any fun with it cause it bogs down all the time. Plus it has a butterfly scoop ontop of the carbs so i dont know if that dose anything.

 

Ok. For whatever it's worth, I've got a tunnel-ram on my 302. It's a Weiand. I have to admit I haven't driven it much, but what little driving I have done, didn't really seem that bad. Very slight bog from a stop. Probably could be tuned out with a little work. Low speed driving seemed about the same as with the single 4 bbl. Hell, the thing even passed the emission test in Illinois! Don't know what you have for carbs, but I've got two 450 Holleys on mine. Really comes alive when you whack the gas, though!

 

Ok thanks for the help, i will have to put the tunnel ram back on my truck, im kinda excited to see what it dose.

 

390CFM If using Holley carbs. 500cfm if using Edelbrock carbs. It will have no bottom end torque, but will pull really hard from 4000 to 8000 rpm. That is the powerband of the intake!!

 

I've got a weiand tunnel-ram on my 302 with twin 600 holleys and it goes well. It has 10.7 to 1 compression and is in a 60 model F100 which I mainly drag race. I always drive to the track and have no problems with it bogging down but the 3000rpm stall might help that.

 

Yeah, the 3000 stall is about right for a tunnel ram.

 

TR are ok if you like to tweak things all the time....more of a wow thing than a performce thing....

 

..."where" do you want to make the MOST torque?

What kind of driving will this vehicle be doing "most"of the time?

Tunnel rams were desinged for HIGH revs...a GREAT way to wash
ALL the oil off your cylinder walls in a modded street motor...