Leyland P76 Owners 2005 |
Technical Information |
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Header design
from the 215V8@yahoogroups.com
Question
- To: 215V8@yahoogroups.com
- From: "frederic"
- Date: Thu, 8 May 2003 09:49:15 -0400 (EDT)
- Subject: Re: [215V8] header design
- Is there any formula or guidelines in chosing the primary tube length for headers?
- The engine is a 4.0 Rover with a fairly healthy cam and single plane manifold in a 1000 lb open wheel road race car. Building 4-1 headers with 1 1/2" primaries. Operating range expected to be 3500-6500.
- Thanks
Reply
- To: 215V8@yahoogroups.com
- From: "Dave Williams"
- Date: Thu, 08 May 2003 06:35:47 -0600
- Subject: Re: [215V8] header design
- v8mazda7 wrote:
- Is there any formula or guidelines in chosing the primary tube length for headers?
- There are lots of formulas, some of which give very different recommendations for header tube length and diameter. Most of the headers work pretty much the same in the end, though. The interaction
- between the headers and carburetor seems to be more important than the actual header layout.
- Pick some workable tube size where you can still get to the manifold bolts and have room to route everything, then route the tubes down to the collectors. For an all-out, single-RPM oval track engine you'd want all the tubes to be the same length; in practice, a 25% variation in
- length just flattens the power peak a bit.
- Almost all production headers have collectors that are far too small. For a 215, you'd want something on the order of 3" diameter by 18" long as an ideal size. Adding collector volume is good well past the point where you can't fit the collectors under the car any more, so don't
- worry about going too big. Run your H-pipe or X-pipe immediately behind
- the collectors. You can join collector-to-collector, through their sides, if it's easier to package.
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Last updated Feb, 2006 |
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