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Old 11-25-2012, 12:29 PM   #71 (permalink)
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I know Im new here so let me tell you guys that Im not new to building engines for more power , I am a engine builder / machinist / fabricator , here are a couple pics of some VW engines I built back in the 80's ,you cant buy these parts , they are hand made , not trying to brag ,just trying to let you guys know I have a lot of experience when it comes to hot rodding stuff this one had Porsche Hemi heads and overhead cams fitted
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91 Heritage ST
80 cid
ported / 5 angle
EV 46
edelbrock 40mm
Dyna S / Nology
MRD exhaust 1 3/4" x 1 7/8" x 2" 2 into 1

Last edited by Dave Harryman; 11-25-2012 at 08:32 PM.
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Old 11-25-2012, 01:05 PM   #72 (permalink)
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Garage
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Old 11-26-2012, 08:23 AM   #73 (permalink)
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Quote:
Originally Posted by Dave Harryman View Post
does the thunderheader antireversion cone have a baffle ? and by baffle I mean a component that restricts flow, because that is what I designed and it drastically reduces noise with virtualy no power loss

Yes, see for yourself here:
Thunderheader X-series Exhaust
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Old 11-26-2012, 10:35 AM   #74 (permalink)
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It is not about "backpressure", but rather the ability to CORRECTLY control the reversion.
Scott
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Old 11-26-2012, 10:47 AM   #75 (permalink)
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Quote:
Originally Posted by chris_lacey View Post
Yes, see for yourself here:
Thunderheader X-series Exhaust

thanks for the info , looks like that is how it can be done on a meg ,has anyone dynoed it back to back against a empty one and do they say how many DB it lowers the noise output ? ....anyway my design is for glasspack type mufflers not megs , and it lowers full throttle noise output drasticly with only a .5 peak HP loss , it makes an overly loud open system pass the FIM/AMA sound test on the dirtbikes we run them on
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Dave Harryman mrd-racing

91 Heritage ST
80 cid
ported / 5 angle
EV 46
edelbrock 40mm
Dyna S / Nology
MRD exhaust 1 3/4" x 1 7/8" x 2" 2 into 1
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Old 11-26-2012, 11:20 AM   #76 (permalink)
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Quote:
Originally Posted by Hillsidecycleco View Post
It is not about "backpressure", but rather the ability to CORRECTLY control the reversion.
Scott
that is what I was trying to say
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Dave Harryman mrd-racing

91 Heritage ST
80 cid
ported / 5 angle
EV 46
edelbrock 40mm
Dyna S / Nology
MRD exhaust 1 3/4" x 1 7/8" x 2" 2 into 1
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