ZR-1 Net Registry Forums - View Single Post

WARP TEN · 02-26-2015

Goldcylon is right. The ZR-1 engine has pronounced natural resonance at two rpm points, about 1800 and about 3400. I believe he is right that the center resonator handles the 1800 rpm frequency and the mufflers handle the 3400 rpm frequency, although it might be the reverse; can't remember. Both contain what are known as Helmholtz Resonators, essentially empty containers specifically sized to damp down the resonant frequencies at those rpm points. Deleting the stock 91 resonator should provide a modest performance gain as the early resonators were quite restrictive. See Marc Haibeck's website to more on that.--Bob

02-26-2015	#4
WARP TEN Join Date: Apr 2007 Location: Lake Bluff, IL Posts: 2,153	Re: Exhaust Resonator Question Goldcylon is right. The ZR-1 engine has pronounced natural resonance at two rpm points, about 1800 and about 3400. I believe he is right that the center resonator handles the 1800 rpm frequency and the mufflers handle the 3400 rpm frequency, although it might be the reverse; can't remember. Both contain what are known as Helmholtz Resonators, essentially empty containers specifically sized to damp down the resonant frequencies at those rpm points. Deleting the stock 91 resonator should provide a modest performance gain as the early resonators were quite restrictive. See Marc Haibeck's website to more on that.--Bob __________________ 2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" Last edited by WARP TEN; 02-26-2015 at 10:55 AM.