{"product_id":"dcoe-carburetor-velocity-stack-set-ram-pipe-design","title":"DCOE Carburetor Velocity Stack set - ram pipe design","description":"\u003ch3 class=\"MsoNormal\"\u003e\u003cstrong\u003eDCOE Carburetor Velocity Stacks – Technical Performance Set (4 pcs, PA-CF)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"MsoNormal\"\u003eThese velocity stacks are engineered for DCOE-type carburetors and designed using the airflow and intake-tuning principles described in Performance Tuning in Theory \u0026amp;amp; Practice — Four-Strokes by A. Graham Bell.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThey provide optimized inlet geometry, improved flow efficiency, and allow you to tune the intake system to your engine’s torque and power needs.\u003c\/p\u003e\n\u003ch4 class=\"MsoNormal\"\u003eKey Technical Features\u003c\/h4\u003e\n\u003cp class=\"MsoNormal\"\u003ePrecision Bellmouth Geometry\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eEach stack uses a smooth, high-radius bellmouth to minimise entry turbulence, reduce boundary-layer separation, and improve volumetric efficiency—especially at high airflow demand.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eFunctional Length Options\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eAvailable in multiple diameter–length configurations so you can match the intake tract to your engine’s cam profile and target RPM range:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003eLonger stacks (e.g., 76 mm) → stronger mid-range torque\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eMedium stacks (50 mm) → balanced power delivery\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eShorter stacks (38 mm) → improved high-RPM response\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003eThis follows Bell’s tuning principle: total intake length directly influences the timing of pressure-wave harmonics that assist cylinder filling.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eAvailable Variants\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e(D = Carburetor throat diameter, L = Stack length)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003e40-38L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e40-50L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e40-76L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e45-38L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e45-50L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e45-76L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e48-38L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e48-50L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e48-76L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e50-38L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e50-50L\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e50-76L\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eMaterial: PA-CF (Carbon-Fiber Nylon)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eEach set is printed in PA-CF, offering:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003eHigh stiffness\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eHeat resistance\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eDimensional stability\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eExcellent surface finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003eIdeal for high-vibration and under-bonnet environments\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThis makes the stacks suitable for both functional automotive use and performance prototyping.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eWhy These Stacks Work\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eBased on Bell’s four-stroke theory:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003eA properly shaped bellmouth can reduce inlet losses by up to 20% compared to sharp-edge entries.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eIntake length tuning allows you to shift torque characteristics without modifying the carburetor or manifold.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eClean airflow into the carburetor improves throttle response and cylinder filling across the rev range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eWhat You Receive\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003e1 full set of 4 velocity stacks\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003ePrinted in PA-CF carbon-fiber reinforced nylon - dark grey color\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RetroMotorWorks","offers":[{"title":"DCOE 40 - 38mm length","offer_id":51807334990171,"sku":null,"price":70.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 40 - 50mm length","offer_id":51807335022939,"sku":null,"price":80.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 40 - 76mm length","offer_id":51807335055707,"sku":null,"price":90.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 45 - 38mm length","offer_id":51807434211675,"sku":null,"price":70.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 45 - 50mm length","offer_id":51807434244443,"sku":null,"price":80.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 45 - 76mm length","offer_id":51807434277211,"sku":null,"price":90.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 48 - 38mm length","offer_id":51807434309979,"sku":null,"price":70.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 48 - 50mm length","offer_id":51807434342747,"sku":null,"price":80.0,"currency_code":"EUR","in_stock":true},{"title":"DCOE 48 - 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