Backpressure - Page 8 - Harley Davidson Forums: Harley Davidson Motorcycle Forum
Harley-DavidsonForums.com is an independent enthusiast website owned and operated by VerticalScope Inc. Harley-DavidsonForums.com is not sponsored by or in any way affiliated with Harley-Davidson Inc.. The Harley Davidson names and logos are trademarks owned by Harley-Davidson Inc.

Go Back   Harley Davidson Forums: Harley Davidson Motorcycle Forum > Technical > Exhaust Systems

» Insurance
» Our Partners
»ATV Reviews
»Motorcycle Games
Reply
 
LinkBack Thread Tools Display Modes
Old 11-25-2012, 01:29 PM   #71 (permalink)
Junior Member
 
Dave Harryman's Avatar
 
Join Date: Sep 2012
Location: so cal
Posts: 28
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
__________________
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

Last edited by Dave Harryman; 11-25-2012 at 09:32 PM.
Dave Harryman is offline   Reply With Quote Quick reply to this message
Old 11-25-2012, 02:05 PM   #72 (permalink)
Luke 22:36
 
Kainam's Avatar
 
Join Date: Oct 2006
Location: Kansas City
Posts: 16,312
Images: 149
Garage
Nice!
__________________
'05 Carbed Night Train
111 rwhp, 112 rwtq
Best 1/4 ET 12.557s
Best 1/4 MPH 108.59
Kainam is online now   Reply With Quote Quick reply to this message
Old 11-26-2012, 09:23 AM   #73 (permalink)
Banned
 
Join Date: Sep 2009
Location: Hamilton, Canada
Posts: 5,338
Images: 4
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
chris_lacey is offline   Reply With Quote Quick reply to this message
Old 11-26-2012, 11:35 AM   #74 (permalink)
Senior Member
 
Join Date: Sep 2008
Location: Munnsville, N.Y.
Posts: 1,426
It is not about "backpressure", but rather the ability to CORRECTLY control the reversion.
Scott
__________________
"....3 dueces and a 4 speed..........and a 389"..........
Hillsidecycleco is offline   Reply With Quote Quick reply to this message
Old 11-26-2012, 11:47 AM   #75 (permalink)
Junior Member
 
Dave Harryman's Avatar
 
Join Date: Sep 2012
Location: so cal
Posts: 28
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
__________________
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
Dave Harryman is offline   Reply With Quote Quick reply to this message
Old 11-26-2012, 12:20 PM   #76 (permalink)
Junior Member
 
Dave Harryman's Avatar
 
Join Date: Sep 2012
Location: so cal
Posts: 28
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
__________________
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
Dave Harryman is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Harley Davidson Forums: Harley Davidson Motorcycle Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 09:07 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
This site is in no way affiliated with Harley-Davidson
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Forum Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum Kawasaki Ninja 250SL Forum