 V6 & V8 teeners - above/below the axles?, Let's see your exahust! |
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| 3d914 |
 Feb 18 2012, 08:01 PM
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#17
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Senior Member  Group: Members Posts: 1,275 Joined: 24-September 03 From: Benson, AZ Member No.: 1,191 Region Association: Southwest Region  |
Here's the mockup pics for the down pipes from the two headers that will merge into a single 2.5" exhaust. Fortunately it merges on the right side, away from the shift bar. PVC is 2in ID - same as mandrels.
Left side. Piece of 1.5" square steel represents the engine bar. Don't want to weld it until I test fit in the engine bay.  Front. Could have come straight down with the right pipe, but need an extra inch of clearance when its on the engine cradle during testing.  Right - well already see something I'll need to fix. Mockup's doing its job.  |
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| matthepcat |
Feb 18 2012, 08:03 PM
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#18
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
Good idea using PVC pipe. Also great choice merging into a single pipe, as it is one of the easiest ways to have NO drone.
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| 3d914 |
Feb 18 2012, 10:12 PM
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#19
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Senior Member Group: Members Posts: 1,275 Joined: 24-September 03 From: Benson, AZ Member No.: 1,191 Region Association: Southwest Region |
matt, can you elaborate on the "drone"?
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| matthepcat |
Feb 19 2012, 12:41 AM
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#20
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
Drone is when your exhaust creates a harmonic vibration often changing depending on RPM and engine load. Conversions with "true dual" exhaust routing seem to suffer from an aggressive version of this problem.
Ever ride in a hotrod with no carpet, and 2chamber flow masters that dump at the rear axle? Drives you crazy on a longer drives. |
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| 3d914 |
Feb 19 2012, 05:36 PM
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#21
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Senior Member Group: Members Posts: 1,275 Joined: 24-September 03 From: Benson, AZ Member No.: 1,191 Region Association: Southwest Region |
Wouldn't a cross-over tube help eliminate that?
From following the SHO sites, it seems they can suffer from raspy exhaust if a resonator (or glass pak) is not fitted. Not sure I'm gonna have room for one. |
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| matthepcat |
Feb 20 2012, 12:30 AM
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#22
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
QUOTE(3d914 @ Feb 19 2012, 03:36 PM)  Wouldn't a cross-over tube help eliminate that? From following the SHO sites, it seems they can suffer from raspy exhaust if a resonator (or glass pak) is not fitted. Not sure I'm gonna have room for one. Sure, but the crossover needs to be close to the manifold/header to be effective. Crossing under the oil pan is your best bet like you are planning. I wouldn't think the raspy SHO problem will crossover to the short length 914. There is however probably enough room to run your resonator & muffler if creative. |
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