| Author | Message | ||
     Phelan |
Anybody know of any manufacturers making of these or even where I might find a pair of one-offs? Not the XR style that has the intakes both on the same side but the kind like in the picture, that has one facing left and the other right? Thanks  | ||
| Brother_in_buells |
http://www.hillbilly-motors.com/html/german_tt_200 7.html | ||
| Basti |
Ross these look like the Feuling 4 Valve heads the had an intake chamber for 2 Carbs left and right  | ||
| Phelan |
Hi Sebastian, I know it looks that way but the photo above is not Feuling heads. I pulled the pic from an article about some prototype dual carb heads that someone had built but I can't remember who, plus the page is something like 10 years old. It may have been M-Tek as mentioned in Brother's link or it may have been someone else. I'll see if I can find the page and link it. | ||
| Phelan |
BTW I've always wanted a Feuling setup but they seem impossibly to find as of late. Kaz has a few sets but I haven't heard from him in YEARS. | ||
| Lakes |
i don't know what that one is but saw how the fueling manifold fitted & it was very tricky to fit the manifold but with that big chamber you have a lot of air space there for high rev's. my friend , drag raced an 8 second 1/4 mile gas Harley about 14 years back or more, & it used the 4 valve heads with stainless steel chamber. think was from a top fuel bike? it was very hard adjusting the valves as used a one push rod to open two valves rocker was forked at valve side, i watched him adjust the valve clearance. | ||
| Trojan |
A few years ago Warr's of London raced a tube frame Buell fitted with a 'true' twin carb setup (I.e. one that had a separate carb and manifold for each head rather than a common 'plenum chamber' that fed both heads from both carbs such as the Fuel setup used). I have no idea where they got it from but suspect it was a Buell factory setup, as Warr's worked very closely with the factory on their race bike. At the end of its development the bike put out aroudn 145bhp but had an engine life (between rebuilds) of around 90 minutes! | ||
| Natexlh1000 |
Don't forget the old sporster trick of using two front heads for an XR1000 look. You would have to figure out headers and two intakes. I don't think either approach is worth it from a performance standpoint. | ||
| Phelan |
Yeah the Feuling setup is quite trick, but I think I'll keep to a more maintenance-friendly 2 valve setup. I may just weld up the intake port on one head and bore it to my needs. That's the plan anyway, if I can't find a setup. | ||
| Phelan |
The problem with two front heads is that it puts the exhaust from the rear head right next to the intake of the front head, with not really enough room for both to coincide. 145 is quite a lofty number; I'm not looking for quite that much. My idea is to put an '08-up XB12 crank and DDFI3 in a 1250-1350cc Tuber but with dual intakes on either side, each with their own TB. | ||
| Phelan |
Also Nate, there has been proven to be quite substantial amount of power available by simply splitting the intakes and doubling carbs/air cleaners. I'll have to find the article the pic is from but they quoted over 15% power just from that change. But more than anything air cleaners on either side just looks insanely awesome  . | ||
| Davefl |
Plenty of power to be had with a single carb.  | ||
| Phelan |
True, but doesn't mean there isn't more to be had. Just because something is the way it's always been done, doesn't mean it's the best way to do it. I don't even want carbs as I said above, I plan on EFI. There is a reason the EBRs and 1125s and separate intake tracts. The only reason HD went with a single is for cost and space reasons. XRs had separate intakes as well for the same reason I stated above. When you're already making your own castings, separate intakes is one of the most effective ways to add power. | ||
| Buellistic |
The CORRECT way to do DUEL-CARBURUATORS is the XR 750 set-up ... Other wise it is just for looks !!! | ||
| Phelan |
http://www.visi.com/~moperfserv/buell.htm http://xlforum.net/vbportal/forums/showthread.php? t=1120517&page=2 This is what I'm looking for. I wish I had those STD heads!  | ||
| Jvv |
This won't be much help...but, about 14 years ago, a guy had this set up at a home coming dyne shot out. He put out good numbers....(1200 engine)......don't remember what they were. I got high Hp....(1550 engine). I emailed him several times and he was still prototyping. He had done 100's of dyno runs and multiple changes over time. If memory serves, he had done radical head work...????.....and cam changes and was still "working" on this to get the "perfect set up. Talked to him on the phone a few time......he struck me as pretty sharp. It was left that I would buy a couple of set ups if he ever decided to produce them. Guess he never did.  Ride safe, Jack | ||
| Phelan |
Hi Jack, that sounds like it may be the guy talked about in the visi .com link I posted above. | ||
| Dannybuell |
why not XR750 tribute with 2 front heads and carbs on the side? | ||
| Rocket_in_uk |
Best I can do sorry.  Rocket in England | ||
| Buellistic |
The PROBLEM or ISSUES to solve is the correct PLENUM length and the FLOW !!! | ||
| Screamer |
Reasonably sure the red S2 is Mike Roland's. The Warrs bike ( without seeing it closer) looks like one of the iterations of dual carb heads that multiple people contributed to, Buell employees and dealer team employees (Tilleys, Hal's - others) included. There's a few of those (racing) head sets around, but they typically aren't too compatible for street use. | ||
| Screamer |
Guess I should have said "was Mike Roland's"... | ||
| V74 |
http://www.visi.com/~moperfserv/buell.htm this is what your looking for. one of the best ever buell tuning articles I have ever read. I so want to put duel carbs on my buell.many years ago i had a triumph daytona T100r and read about the difference between triumph single carb and twin carb and twin carb on triumphs should up bhp by about 5 .it will use more fuel but I didn't get my buell for fuel economy but to blast around on. | ||
| Phelan |
Thanks; I actually linked that same article in one of my posts above . I doesn't sound like anyone is making any of these right now :/. I've also been talking to another friend of mine named Steve on another forum, who has heads similar to the STD heads I posted above; he said plenum length is absolutely critical because plenums the length above and longer make absolutely terrible fuel delivery at high RPMs because of vibration. Also the heads I pictured above wouldn't fit on a stock motor as the ly were designed for a taller, big inch XL motor. | ||
| Phelan |
Plenum length would not be an issue in my application though because I would put injectors in the intakes a couple inches from the head a Mass Airflow sensors behind the air cleaners, since my goal is an EFI build. | ||
| Screamer |
Phelan, Sorry for stating the obvious (about the S2 being Roland's old S2) I hadn't opened the link. I've seen Strocieck and Merch dual carb heads and there's been a few prototypes floating around that regional aftermarket companies had developed. The problem in addition to being pretty rare, is most were for big twin. | ||
| Phelan |
Yeah, I'll probably end up seeing if I can weld up and cut up and XB head and do my best to port and line it up to match a stock exit, ported opposite XB head (if that makes sense). This will be a little down the road but it is certainly in my list of things I want to do, especially since I'll be apprenticing in a shop in a couple months . | ||
| Maru |
That is Mike Roland's old bike. Last I heard the engine ended up in a speed trials bike. That engine had special heads that he did a short production run of. A lot of the things that were tried on that Buell have reappeared in the Wild Things line of performance kits Mike developed. He is a really sharp guy. | ||
| Rocket_in_uk |
The Warrs bike ( without seeing it closer) looks like one of the iterations of dual carb heads that multiple people contributed to, Buell employees and dealer team employees (Tilleys, Hal's - others) included. There's a few of those (racing) head sets around, but they typically aren't too compatible for street use. If I remember correctly that is how Martin from Warrs told it to me. Rocket in England | ||
| Lakes |
yes I've talked to Mike Roland via e mail. he knows HD motors in all shapes & forms. & can ride too/ was first man to get a single engine HD based Nitro top fuel bike to 200mph 1/4 mile. he also used an open chain primary drive on his nitro bike. they all use Belt primary, but Mike was different. might not mean much to a lot of you. but i'm interested in Top Bikes.. the heat the clutch generates can melt a belt drive primary. after you have done a 1/4 mile and waiting to tow back. a lot pull clutch out and blow air on clutch hub or even throw water. just the power they put out now i don't think they could run a chain as could break & cut riders , what ever is above the primary or kill rider. the belts hurt but don't kill you. love the look of the duel carbs but like the feel of one throttle cable better. | ||
| Phelan |
I'm with you on that John. I wouldn't want two extra cables either. Fly by wire baby!  | ||
| Lakes |
My car has fly by wire ,saw some dresser hd use that two, you will have more trick's than a monkey in a mile of vines Ross. But good for you. There would be a lot of options with fly by wire if you could custom program it. | ||
| Phelan |
Well my other passionate hobby is computers, so I gotta find ways to tie them together . |
