FrontEngineDragsters.Org Forum

Technical => Spud Miller's Cave => Topic started by: spookie on June 19, 2023, 09:40:35 AM

Title: ram tube length for more power
Post by: spookie on June 19, 2023, 09:40:35 AM

Would matching intake length add more power.I see different length tubes on some dragsters Have crower on a sbc[alcohol].I know length effects toque curve.Any advice would be appreciated.

Title: Re: ram tube length for more power
Post by: THE FRENCHTOWN FLYER on June 20, 2023, 05:24:09 AM

On a drag car I don't think tube length is that important. I've seen everything from NO tubes to 15" long. The revs on a dragster go up so fast and so high that the optimum tuning length as you make a run quickly diminishes to zero. Especially true if you are using a high stall converter.

Title: Re: ram tube length for more power
Post by: dusterdave173 on June 20, 2023, 05:30:45 AM

I played with it--Just keep your nice visual look--shorter stubby do make top end --but in our league not worth giving away the cool look of stacks--tiny gains at our level IMO  --from the cockpit  I love to see the "frost " on the tubes beside the fire coming out the headers
Have fun!

Title: Re: ram tube length for more power
Post by: wideopen231 on June 20, 2023, 08:33:26 AM

I would think rpm range has big effect on correct answer here. Look at Jr. fuel guys.No tubes and some running into 6.90 or quicker with SBC. I was never crazy about the staggered length look.  If I ran that style injection it would very short stacks

Title: Re: ram tube length for more power
Post by: spookie on June 22, 2023, 11:52:15 PM

Thanks for your input,will keep the cool look.

Title: Re: ram tube length for more power
Post by: denverflatheader on July 22, 2023, 08:45:10 AM

spookie - I'm thinking it's not such a simple question for individual runner stack injection.  It needs to have all the fuel injection parts correct based on your engine specs and fuel selection.  For example, a more important item is the size of the butterflies based on whether you are going to run gas, methanol, methanol and nitro, or just nitro.

As wideopen stated, the Jr. Fuel guys running IR stack injection run virtually no stacks, and their butterflies are probably 3 inch diameter or larger on a sbc style engine.  Compare that to a 327ci bracket racer with an early Hilborn running gas, their butterflies are easily half the size when it comes to flow.  The early Hilborn would slow the Jr. Fuel person down, and vice versa, the 3 inch diameter on the 327 running gas would slow it down as well no matter what length velocity tube was selected. 

For me, if my goal is to achieve the best hp/torque for my own engine spec, I'd start with the correct basics and add parts correctly from there (e.g. pump, barrel valve, filters, nozzles, lines, etc.).  Alan