Author Topic: What in the Hell is going on  (Read 517 times)

0 Members and 0 Guests are viewing this topic.

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: What in the Hell is going on
« Reply #20 on: September 10, 2015, 09:44:17 pm »
Bimotion, Mota work well.  Been playing around with the inexpensive Pipe Wizard program and it seems to work good. Hotsaw racer friend in Australia made a few pipes from the Pipe wizard program and dynoed the different pipes. The bellow diameter and cone angles were changed but tuned length remained the same. The pipe with the shallower cone made the best power, so as Ed mentioned above, to steep a cone angle doesn't always work.

Offline EHP

  • Gas Hotsaw
  • ******
  • Posts: 598
  • Karma: 74
Re: What in the Hell is going on
« Reply #21 on: September 11, 2015, 08:39:25 am »
again thats on a bike design motor , this is for chainsaw , crankcase is different and port degrees are different . Even type of fuel makes a big difference on how much horsepower each different pipe design makes  or rpms , How you make your turn with the header also changes the rpms of the pipe , main reason is some pipe designs you make each cone of the header , some pipe design you make the header all at once in a long straight cone first then cut into cones , each cut with a thin blade is .025 so by the time you finish cutting 13 or so cones you have raised the powerband a 1000 rpms over what you set your goal at , Another thing , a pipe is or should be designed by the type of transfer ports in the motor , the smaller narrow ports like a small taper header better as a big taper will over draw what the small  ports can feed , In a chainsaw most times its ported to pretty much max on port width and has a flatter port roof so most like the bigger taper and big dwell pipe , Alcohol is abit different than gas , most alcohol pipes are at 3.2 degrees , some are 3.4 degrees , bigger the degree taper the more fuel is needed and most alcohol saws are max out at 3.2 degrees if the ports are max out on size as well . My computer program is TSR which I donot believe you can buy any more , I think its the easiest to use as if you change 1 thing on the pipe the program changes the other cone angles to keep the pipe correct plus once you build your pipe it will print all the measurements to cut the pipe out of the metal type you are going to use , you even have to tell the program what thickness and pipe temp your using for the program to set the cone angles at . One thing thou , this program will always build you a pipe with a smaller degree header and dwell, you have to tell program that you want this degree of taper or this diameter of dwell

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 22582
  • Karma: 591
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: What in the Hell is going on
« Reply #22 on: September 11, 2015, 01:02:56 pm »
Do we want to show different pipes in pics? I've only had a few.

partner 5000 3ci was Marcel Vincent pipe, hotsaws stihl is Dave Neiger, husky Cliff Helsel,  dolmar Gille Levesque.  372 pipe Simon Bertrand I seen Simon selling and told Jim about, which is on Jim's saw he bought from me.






REDNECK Saw Repair Getter Done

Offline EHP

  • Gas Hotsaw
  • ******
  • Posts: 598
  • Karma: 74
Re: What in the Hell is going on
« Reply #23 on: September 12, 2015, 01:00:53 pm »
to most seeing a pipe does nothing other than seeing a pipe , it doesnot help understand what the pipe was meant to do 

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 22582
  • Karma: 591
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: What in the Hell is going on
« Reply #24 on: September 12, 2015, 02:52:42 pm »
I do know about matching the porting etc. Just thought it would help  them by seeing the different belly tapers etc.   

Some I see people using out there on woods play saws make me wonder how well they actually work.
REDNECK Saw Repair Getter Done