Suzuki GSXS1000 Forum - Reply to Topic
Thread: Updated exhaust System Reply to Thread
Title:
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now



In order to be able to post messages on the Suzuki GSXS1000 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:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
09-12-2018 05:44 AM
temporarykiwi i was fortunate to know someone who made extremely good exhaust systems when i was younger, his ideas i still replicate to this day, anyway he beleived around 300ft/second was as fast as was required for tailpipe exit speed, i ve found thru experimentation that the header speed can be alot lower on a 4-2-1, as long as the speeds increase into each section in a progressive amount, such as 180ft/sec followed by 240ft/sec, and then 280-300ft sec in final section.
so here is exhaust building 101 - craig smiths version, - the aim of an extracter exhaust is not just to provide a free flow escape path for the gases, but to utilise this force as a means to increase the low pressure zone in the combustion chamber, this then enabling more inlet charge to fill said chamber and boost power. namely by providing vacume on the next junctioned cylinder at a time when the inlet valve is opening, just as the ex valve is closing, i.e that being the overlap period of the cam timing.
the force used is the inertial weight of the gases moving down the exhaust tubes, this force is the amount of gases moving and the speed that they are moving, so if they are moving faster into each section, and each section has more volume, the said vacume force will be greater, then its a matter of getting it to effect that next cylinder at the correct time frame, hope that gives you'all something to ponder..
09-12-2018 03:41 AM
PhuketPaul
Quote:
Originally Posted by temporarykiwi View Post
im not saying youll lose power in mid-topend, but you may not gain any there, probably will gain more topend power though
worked out your ex gas speeds roughly 159 ft/sec-37mm id headers, 188 ft/sec-48mm id secondrys, 250ft/sec-59mm id tailpipe, thats if your running 12500rpm max
Showing my lack of knowledge on this subject - I've been reading as much as I can and i get the idea and the reasoning that faster is better and bigger is better but you can't have both and that once the bore is too big the gas slows down too much to get any decent scavenging, but that too small restricts the gas too much....

But what I can't find out is what speed is too slow? what is a good speed - and its even more confusing when you combine imperial and metric...
09-12-2018 01:17 AM
temporarykiwi
up dated exhaust

Quote:
Originally Posted by PhuketPaul View Post
Thanks for the response.

From the butt dyno it doesn't feel as though I've lost any bottom end at all but will have to wait for the real dyno to find out for sure, if Ive lost or gained anything and where....

From the grin dyno its all positive
im not saying youll lose power in mid-topend, but you may not gain any there, probably will gain more topend power though
worked out your ex gas speeds roughly 159 ft/sec-37mm id headers, 188 ft/sec-48mm id secondrys, 250ft/sec-59mm id tailpipe, thats if your running 12500rpm max
09-11-2018 09:28 PM
mike d I love the can, I love the sound, I love anything Ti, and I love the blueing! Great work Paul!
09-11-2018 09:04 PM
PhuketPaul
Quote:
Originally Posted by pulsar2 View Post
That is a beautiful exhaust!! And as usual pretty neat upgrades from you. Have a couple of questions :
- What did it cost to make it in Titanium vs Steel?
- Any plan to share the design or maybe sell these?
I built the full stainless headers to my design, but the rear pipe and can in Titanium i purchased and modified and they don't do an alternative in stainless so don't know of the price difference, however the price was not excessive.

Someone else asked me about buying one, and I may well get them made and sell them but not until I've had it dynoed, I would also be more than happy to share the design at the same time
09-11-2018 02:14 PM
pulsar2 That is a beautiful exhaust!! And as usual pretty neat upgrades from you. Have a couple of questions :
- What did it cost to make it in Titanium vs Steel?
- Any plan to share the design or maybe sell these?
09-11-2018 10:04 AM
PhuketPaul
Quote:
Originally Posted by FreedomPenguin View Post
why is the pipe discoloring at those two areas? looks good Paul.
The entire end pipe and silencer are Titanium, Titanium is both lighter and stronger than stainless steel, because it is stronger the walls can be thinner as well making it even lighter. Another advantage is it is more corrosion resistant than stainless (being a Scuba Instructor i know this as every stainless knife will rust in salt water but Titanium doesn't at all). Pick up a titanium exhaust pipe and the weight difference is quite shocking.

When Titanium heats up (and it's thinner so heats more quickly) it produces an oxide which is blue, thus the blueing of the pipes, heating the pipes before bending them will cause blueing as will riding hard.

Many people like the look of blueing Titanium pipes, whether it's down to the actual look or just bragging rights to show you have titanium pipes I'm not sure....
09-11-2018 09:29 AM
FreedomPenguin why is the pipe discoloring at those two areas? looks good Paul.
09-11-2018 08:57 AM
PhuketPaul
Quote:
Originally Posted by temporarykiwi View Post
hi paul, i agree the stock tailpipe is very small, it means exhaust gas exit speed is well over 300ft/second. but the 63mm /2.5" tailpipe drops that a long way, plus the 50mm secondary's also reduce gas speed considerably, it may deliver more high topend power, but id think at the expense of midrange to lower topend grunt.
ive made a new tapered exhaust system with headers starting at 41mm id, tapering to 36mm id at collecters, secondarys tapering from 45 id to 42mm id, tailpipe tapering from 56.5mm id to 55.25 id, the whole exhaust system is tapered to suit the heat at each and every portion, but also to provoke manufacture of vacume into next cylinders combustion chamber
Thanks for the response.

From the butt dyno it doesn't feel as though I've lost any bottom end at all but will have to wait for the real dyno to find out for sure, if Ive lost or gained anything and where....

From the grin dyno its all positive
09-11-2018 08:29 AM
Robbieben Interested to see the dyno results, nice looking pipe by the way.
This thread has more than 10 replies. Click here to review the whole thread.

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

 
For the best viewing experience please update your browser to Google Chrome