speedysprocket
Alex
- Location
- Chesapeake, VA
Did you figure this out? Do you want the holes on the manifold moved?
Factory pipe head pipe differences
- Thread starter durhamgoat
- Start date
- Location
- Jasper IN
I really back burnered this since I have about 2 weeks left to ride, after that I will start to look at it again, but if I keep the manifold then the holes will have to be moved. Since moving them will require welding I am still planning on trying to use a 750ss manifold and welding it up so I can drill, retap, and match port it to the headpipe.
I am kind of surprised that there is no higher flow exhaust manifold that matches Kawi to the 800 headpipe.
If you have another idea I'm interested.
I am kind of surprised that there is no higher flow exhaust manifold that matches Kawi to the 800 headpipe.
If you have another idea I'm interested.
- Location
- the jetski grave yard
why dont you just cut the chamber right where the coupler clamps on and have it welded? much easier to do that than modify a manifold and that weld should be dirt cheap. you wouldnt even need to cut it all the way off, that way you could do all the mocking up and a quick weld finishes it.
- Location
- Jasper IN
That's a good idea Buzzard and I may go that way. When I winter tear down I am going to measure the manifold better and see if it looks like a significant restriction and if its worth the hassle of customizing the manifold for both the rotation and the restriction.
speedysprocket
Alex
- Location
- Chesapeake, VA
Well reason I asked was I just repaired this manifold that required welding all the holes in and redrilling and tapping...
- Location
- Jasper IN
Wondered why you asked, and yep that is what I was thinking. Our welders at work were wondering if its possible to get to the bottom of the holes when you fill, seems like it would be hard.
They were thinking about cutting the threads open on the side and filling sideways instead of down the hole.
They were thinking about cutting the threads open on the side and filling sideways instead of down the hole.
speedysprocket
Alex
- Location
- Chesapeake, VA
The one odd hole I took the end off and filled it all in. The two close holes I drilled out big (they were big already from the time serts) and then welded them in. I got almost all the way to the bottom, which is deeper than the heli coils I then put in. Of note, I seemed factory pipe cast the manifold with aluminum slugs in there for the threads. Remnants of these slugs began to peel out of each hole as I excavated...
But in the end, not terribly hard to weld them in and redrill. I used a short piece of PVC tube the fit the manifold and head pipe tightly to align the bores...
But in the end, not terribly hard to weld them in and redrill. I used a short piece of PVC tube the fit the manifold and head pipe tightly to align the bores...
Last edited:
jeremy chambon
Need more power
- Location
- rockford MI
I just tug up a wb1 chamber with a 308 rod ran like dream. When I've welded the casting in the past the dirt cast made a little bit of a challenge but doable
speedysprocket
Alex
- Location
- Chesapeake, VA
What...?
jeremy chambon
Need more power
- Location
- rockford MI
Someone talked about cutting the chamber and bending it. In the past when I tig welded a manifold the impurities in the cast posted a problem. But the stainless chamber that I just welded a crack in welded up really nice. So I was trying to get at it mite be a better option.
- Location
- Jasper IN
Got it. The chamber from fp is aluminum and its rolled and welded from the factory so it should weld good if I go that way. I did weld up a rub hole already so I know it will weld.
Last edited:
jeremy chambon
Need more power
- Location
- rockford MI
That's good.
- Location
- CT
Why didn't you just cut and weld the chamber?
- Location
- Jasper IN
It was a new chamber and I didn't want to hack it up, just needed to weld the rub hole. I'm riding tomorrow then I'm likely done for the season so I'll start looking at mods after that.
speedysprocket
Alex
- Location
- Chesapeake, VA
I wasn't sure about the dirt casting part... Since Factory Pipe makes the manifold and head pipe, I'd like to assume they use the same sand casting process, and I haven't had issues welding either of the manifolds I've welded.
Regardless, looks like durham has several options here.