CAMARO6 - View Single Post

oldman · 09-08-2019, 04:16 PM

I have them, them were great, I thought they went belly up?

For cats melting down, at 400 to 500 HP per cat on alcohol, running at max rich HP, I would imagine there is a whole lot of incomplete burn hydrocarbons flying out the header, that is just a surface to completely oxide the hydrocarbon chain. Who knows what temps the stoichiometric reaction is reaching. When I was researching exhaust valves basically all alcohol race engines were in the inconel range of exhaust temps. For what is worth on my 4 bangers (put out the same HP per cat), I was using HJS metalic cats much bigger and heavier than my kooks cats.

Sorry it has just been too long since I ordered a metalic core for my 4 banger... Anyway here is a little blurb.

I think I was paying about $400 a cat.

https://forums.vwvortex.com/showthre...t-vs-metal-cat

https://www.hjs-motorsport.de/produc...catalysts.html

Aint small or cheap, but I never blew one out. I thought they were a Swedish company since I got turned on to the product when I was hotrodding my Volvo V70 R and S40 T5 ( I hotrod everything). Maybe HJS is the OEM? dunno, Germany... working with Swedes.. be very careful yah.

09-08-2019, 04:16 PM	#5
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,324	I have them, them were great, I thought they went belly up? For cats melting down, at 400 to 500 HP per cat on alcohol, running at max rich HP, I would imagine there is a whole lot of incomplete burn hydrocarbons flying out the header, that is just a surface to completely oxide the hydrocarbon chain. Who knows what temps the stoichiometric reaction is reaching. When I was researching exhaust valves basically all alcohol race engines were in the inconel range of exhaust temps. For what is worth on my 4 bangers (put out the same HP per cat), I was using HJS metalic cats much bigger and heavier than my kooks cats. Sorry it has just been too long since I ordered a metalic core for my 4 banger... Anyway here is a little blurb. I think I was paying about $400 a cat. https://forums.vwvortex.com/showthre...t-vs-metal-cat https://www.hjs-motorsport.de/produc...catalysts.html Aint small or cheap, but I never blew one out. I thought they were a Swedish company since I got turned on to the product when I was hotrodding my Volvo V70 R and S40 T5 ( I hotrod everything). Maybe HJS is the OEM? dunno, Germany... working with Swedes.. be very careful yah. __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires. Last edited by oldman; 09-08-2019 at 04:52 PM.