Comparing Sheetmetal Tunnel Ram to cast single Four

so after looking at different manifolds for the c-heads , i saw a couple of fabricated Tunnel Rams with a single carb set up ...but i would think that the FRPP cast manifold would be a better piece ....it seems like the end runners on the Tunnel ram are so far away that they would cause a lean condition and that if you do go with a TR you would be better off going to a 2 carb deal ......... so what do you guys think

Does your wife know about all of this yet ......????

Back in the 60's....they said "with dope there is hope".....2009...."with spray there is a way"

richter69 wrote:My little budies C headed deal just has the one carb and 3 foggers..........the carb is to drive it to the lanes, make the burnout, and drive back to the pits.............all them nozzels make the pass.

IMO single carb is simpler, cheaper, lighter. Dual carb will make a bit more power on motor, but not sure if its worth it with all the spray.

tr or cast ?

TR = lots of $$$$$, I'd get the motor together with a single 4 and add the TR later.... You should be able th get 1100 with a single and a no2 hit = bunch more. YouR going to need a car to put the motor in even at the entry level.....

You could buy Charlies C head to A head intake adapters. With a ported Trick Flow tunnel ram and adapters, you will be right about 1K, give or take a few bucks. Of course, then you'll need two carbs as well...

let me rephrase the question again ......... if the client wants to use a single carb and he has a choice between a tr and the cast manifold which is better ??........ to me the design of the cast manifold looks like it has better distribution and the single carb TR looks like it would have problem with fuel dist. on the corners.

what do you guys think .......

If I remember correctly, the A460 tunnel ram with the pent roof single four top was superior to the cast single four intake. Seems to me Charlie did some testing and I believe that was the case. The single four C 460 manifold is a nice piece though and might be the best choice for your deal, Nick. Doesn't require adapters and is certainly the cheaper route. I'm not a "juice" guy so, I tend to think two carbs and a tunnel ram. It's whatever you want, it just takes money

If you use 2 carbs, does that make it easier to adjust the "longer" runs so that they don't get lean?

With two carbs you can put 8 jets in it and "balance" A/F for each cylinder?

What do you think??

Bruce

Bsherry wrote:If you use 2 carbs, does that make it easier to adjust the "longer" runs so that they don't get lean?

With two carbs you can put 8 jets in it and "balance" A/F for each cylinder?

What do you think??

Bruce

Seems to be the case, in my experience. I'm considering splits on my new build to position the carbs for even better distribution. We shall see...

No dought in my mind a properly designed sheet metal ram and 2x4 is the superior set-up if you have the budget and room to fit every thing. On another note it does add additional weight......

One reason I believe a sheetmetal TR will outperform a cast intake is harmonics (runner length). The sheetmetal TR will have equal runner lengths and runner lengths that are tuned for your exact engine combo. It's very similar to equal length headers...just on the intake side .

I'm going sheetmetal TR on my low RPM build. When I get it dynod, I expect to see reasonable gains over my 'tuning window'.

Have a good day!
Michael

I have not fooled with the tfs TR before, but i'd be intrested in how much CSA there is available at the runner entry in the plenum, or how big can it physically go before welding,ect ? runner lenghts would also be nice too.

Don't have exact dimensions, but I know the TFS tunnelram will port match to Charlies cnc'd C 460 heads.