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Message started by tbalam on 04/17/07 at 19:06:11

Title: aftermarket header pipes
Post by tbalam on 04/17/07 at 19:06:11

I know that raask makes one, but anyone know if any other manufacturers make an aftermarket header for the savage?

Title: Re: aftermarket header pipes
Post by Reelthing on 04/17/07 at 20:06:56

Several have came up on ebay from time to time - I picked one up made by MAC in the late 80's new in the box - fair bit bigger single wall black coated.

Title: Re: aftermarket header pipes
Post by justin_o_guy on 04/17/07 at 20:38:49

Sounds like real bizzniss there.. Will the Trapp fit on it or would it need a different muffler?

Title: Re: aftermarket header pipes
Post by Reelthing on 04/17/07 at 22:36:34

With some engneering - measures ~-1 7/8" inside diameter it came with a fine megaphone style with a foot long removeable baffle - should take a picture of it - going to put it to use one of these days with a head port, piston(hopefully), cam shaft, and amal carb.

Title: Re: aftermarket header pipes
Post by LANCER on 04/18/07 at 04:06:13

Wow, the 1 7/8" pipe is a big'n.

Title: Re: aftermarket header pipes
Post by Savage_Rob on 04/18/07 at 07:20:48

Reelthing wrote:

Several have came up on ebay from time to time - I picked one up made by MAC in the late 80's new in the box - fair bit bigger single wall black coated.

I'd love to have one of those.

Title: Re: aftermarket header pipes
Post by justin_o_guy on 04/18/07 at 08:16:49

Yep,, black sounds Good to me, 1&7/8ths sounds Great,,Crimineee, is it possible for it to be too big? I know nothing about exhaust theory, except it's gotta go somewhere & easy flow is< as well as I understand it, the idea. If it gets Too easy, is there a price to pay? Of course, adjusting baffles on a Trapp would handle that I guess..

Maybe what I need is a single walled Raask,,tokeep it easy to work with & simple.

REEL>> Is there any issue created by such a large diameter header? Would a Supertrapp be okay on it? I know I am not about to run spend this $$ any time soon, because of the piston deal, but I woulkd like to be rteady if a deal comes up. Anyone with cautionary ideas on this? Upside?

Title: Re: aftermarket header pipes
Post by Savage_Rob on 04/18/07 at 09:10:24

I'm still planning to take a stock header, have a SE muffler welded to it, and then get the whole dang thing coated with ceramic (probably satin black).

Title: Re: aftermarket header pipes
Post by Reelthing on 04/18/07 at 11:39:28

justin_o_guy wrote:

REEL>> Is there any issue created by such a large diameter header? Would a Supertrapp be okay on it? I know I am not about to run spend this $$ any time soon, because of the piston deal, but I woulkd like to be rteady if a deal comes up. Anyone with cautionary ideas on this? Upside?

Yes you can have to big of an exhaust port - what is suppose to happen with the cam overlap is the piston gives the exhaust a push thus it has a running start this setups a neg pressure in the cylinder and the intakes starts to open a bit before the exhausts close - if you have too big of an exhaust port it will go back into the cylinder - this is called reversion - a number of companies make an anti-reversion cone - it's looks like a metal doughnut that goes in the pipe at the head - the head of the savage has this built into the exhaust port - so there is certainly a danger of porting the exhaust to far. Too big a pipe maybe but most of the flow is controled at port/cone. Fair quick read below

http://www.jpcycles.com/Tech/Articles/needtorejet.aspx

Title: Re: aftermarket header pipes
Post by klx650sm2002 on 04/19/07 at 02:06:04

I had these two pipes custom made, the KLX one, top is made by sand pack heating and bending, the bottom on is made using pre formed bends, cutting and welding.
http://i119.photobucket.com/albums/o147/klx650sm2002/brickwall.jpg

http://i119.photobucket.com/albums/o147/klx650sm2002/fullpipe.jpg

Clive W :D

Title: Re: aftermarket header pipes
Post by justin_o_guy on 04/19/07 at 11:01:22

Reelthing wrote:

Yes you can have to big of an exhaust port - what is suppose to happen with the cam overlap is the piston but most of the flow is controled at port/cone. Fair quick read below

http://www.jpcycles.com/Tech/Articles/needtorejet.aspx

Uh Huhh, I read it & now I know what to do. I am gonna need someone to just TELL me what pipe will be appropriate for the cam, piston,displacement & rpm range. Uh Huhh, I am just that smart..

Title: Re: aftermarket header pipes
Post by LANCER on 04/19/07 at 11:37:29

I kept reading stuff here there and everywhere, and after going back and forth several times I finally settled on a 1.75" OD pipe to use for the header. It seemed to be the best compromise, everything considered.

I have thought of making another one using a stepped design and starting with a 1.5" ID and ending with a 1.75"ID before going into a 2.5-3.0"OD muffler. But with all the stuff happening these past months I have just not had the time. I would be fun though.

Title: Re: aftermarket header pipes
Post by Reelthing on 04/20/07 at 21:22:13

Now that's getting close to a two stoke expansion chamber with a bounce back if you put a cone on the end of that 3" pipe - those really do semi supercharge a 2 stroke as they pull the intake charge out the exhaust and after the intake port is cover by the piston the bounce back stuffs it all back in - only works for a narrow rpm range but boy can you ever feel it - bout doubles the HP all of a sudden.