11 December 2025 — This is from Grok’s info on why Dodge didn’t install a catch can on their cars from the factory.
“From an engineering standpoint, every supercharged 6.2L Hemi should have left the factory with a catch can — especially the 800–1,000+ hp Redeye/Demon/Jailbreak models that make obscene amounts of blow-by.
From a corporate standpoint, it will never happen because it costs money, creates warranty headaches, requires emissions re-testing, and adds a maintenance item to a car that’s marketed as “fill it with pump gas and send it.”
That’s why the aftermarket (Corsa, Mishimoto, JLT, Billet Tech, etc.) makes an absolute killing selling $120–$200 catch cans to Hellcat owners — Dodge handed them a guaranteed profit center on a silver platter.”
Why the bronze filter? Because sintered bronze is super friend to oil, collects it well, and droplets form from oil mist, which then fall into the can. Works extremely well at separating oil from the air.
Excellent Oil-Wetting and Coalescing Properties Oil loves to stick to bronze. When blow-by vapor (loaded with oil misted oil hits the bronze mesh, the oil droplets wet out and cling to the huge surface area of the sintered bronze. This causes tiny droplets to combine (coalesce) into bigger droplets that then gravity-drain to the bottom of the can. Stainless steel and aluminum don’t wet nearly as well with oil, so bronze separates oil far more efficiently.
Self-Cleaning / Anti-Clogging Because the oil wets and flows across the bronze rather than just building up, the filter stays relatively clean over time. Many stainless mesh filters clog and need frequent cleaning; bronze elements often last years with almost no maintenance.
Perfect Pore Size and Flow Sintered bronze is typically 40–60 microns. That’s ideal: small enough to catch almost all oil mist, large enough to flow tons of air without creating crankcase pressure (very important on boosted or high-rpm engines).
Corrosion Resistance Bronze (especially phosphor bronze or silicon bronze) doesn’t rust like steel and handles hot, acidic blow-by gases way better than aluminum, which can pit over time.
Thermal Conductivity Bronze conducts heat well, so when hot blow-by hits the cooler bronze element, it helps condense the oil vapor even more (same principle as a radiator in reverse).
Proven in Industry Sintered bronze filters have been the gold standard for decades in industrial air/oil separators, compressor breathers, pneumatic silencers, etc. Catch can manufacturers (Mishimoto, Radium, Moroso, RX, etc.) almost all use bronze elements in their top-tier cans for these exact reasons.
Sintered bronze is made by taking tiny spherical grains of bronze powder (usually 90% copper + 10% tin, aka “90/10 bronze”) and compressing them under enormous pressure and heat — but not melting them completely. The particles fuse together at their contact points, forming a solid metal part that is full of millions of microscopic, interconnected pores.
Think of it like a 3D bronze sponge made of metal balls welded together — strong like solid bronze, but porous like a filter.