Bigger Throttle Body
Ultimate HDF Member
Joined: Jan 2008
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From: SoCal
TB is fine, the 260's were most likely too "big" the 251's should make either bike quick as hell. Cam choice has much more positive/negative effect on ridability than TB/Carb size, hell so does the exhaust for that matter, unless one is chasing a dyno sheet instead of a fun to ride machine!
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Joined: Oct 2008
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From: Hollis
That SE 58 uses 1.8" runners. Thats almost 46mm, thats just too darn big, you gain nothing with it. Im sure it will "work" fine, but your in all honesty just leaving some low band power on the table. But anyway, regardless of what you do, good luck with the build. =D
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Joined: Oct 2008
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From: Hollis
TB is fine, the 260's were most likely too "big" the 251's should make either bike quick as hell. Cam choice has much more positive/negative effect on ridability than TB/Carb size, hell so does the exhaust for that matter, unless one is chasing a dyno sheet instead of a fun to ride machine!
You contradict your self heavily here and maybe you dont even realize it.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
You are right about the cam def of too "big" being incorrect, but I think you get what skyhook and I were both trying to say, and as for 58mm TB being oversized I still disagree with you but hey thats what makes the world go around, trying different things and seeing how they work for yourself. I would have not have thought of trying the 58 but it was recommended to me(not by a HD dealer) and I will say that I did not try the stock 50mm tb on the motor first with all the other parts,it all went together at once, so you could have a point that the 50 maybe better than some bigger TB's , I can only say what I have tried is working very well in my case, it is very fun to ride, that is what we are all after!
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Joined: Oct 2008
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From: Hollis
You are right about the cam def of too "big" being incorrect, but I think you get what skyhook and I were both trying to say, and as for 58mm TB being oversized I still disagree with you but hey thats what makes the world go around, trying different things and seeing how they work for yourself. I would have not have thought of trying the 58 but it was recommended to me(not by a HD dealer) and I will say that I did not try the stock 50mm tb on the motor first with all the other parts,it all went together at once, so you could have a point that the 50 maybe better than some bigger TB's , I can only say what I have tried is working very well in my case, it is very fun to ride, that is what we are all after!
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Road Warrior
Joined: Nov 2007
Posts: 1,984
Likes: 7
I'm watching. Probably will save my money.
Think I'll wait till the stock market gets better anyway. Killing me.
Then maybe 52-54mm something.
I do know about the port volicity stuff.
I also know this little dink Harley 46mm, even with a good improver to it, just don't cut it. Why this disscussion.
Like that old Holly carb, with enough accelerator pumps (2-50cc reo)and big shooters you can make a pig fly. But it was a little more focused.
Think I'll wait till the stock market gets better anyway. Killing me.
Then maybe 52-54mm something.
I do know about the port volicity stuff.
I also know this little dink Harley 46mm, even with a good improver to it, just don't cut it. Why this disscussion.
Like that old Holly carb, with enough accelerator pumps (2-50cc reo)and big shooters you can make a pig fly. But it was a little more focused.
Thread Starter
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Road Warrior
Joined: Nov 2007
Posts: 1,984
Likes: 7
By the way the heads on this bike are prepared pretty well.
All Woods springs and valves ported and breathed on just about to the max by Wolfgang Grasser in Baytown, Tx. Inlets are bigger than 1.66 but I cannot remember just what maybe 1.78, something like that. They flo 280 cu.ft. at whatever pressure you guys use. Standard flow bench. They are set up for the Woods 400 Tw8 series cams.
Course Bob woods being Bob Woods figured TW8-6 cams at least. May have been right. And shorting up the gearing. Gotta be careful what you ask for with him. So the heads are better that what I'm running. I was hesitant last year, doing better now, but broker.
Wolf is building a engine for a guy I know in Houston, heads flow just about 300cu.ft. Will be on a Ultra. So I guess standard work for him.
Now Wolfgang knows a thing or two about this. He has won the Horsepower shootout at Datona several times. Pretty focused efforts for sure. It's on Woods web site. I'm bragging for him, he won't. But these heads are capable of doing well.
At that time he also worked on the TB and the best got was 240. Stock was 200, (220?) So it's still the choke. I figure a good number would be 300 but I don't have the numbers different TB's flow. Feeding two cylinders after all. I doubt a SE 50cc would do that stock, but I don't know. I figure whatever I get I'm just bolting on. Cost enough as it is.
You guys are great keep it up. I would like to go to Sturrgis, may have time and I'd ride all the way.
All Woods springs and valves ported and breathed on just about to the max by Wolfgang Grasser in Baytown, Tx. Inlets are bigger than 1.66 but I cannot remember just what maybe 1.78, something like that. They flo 280 cu.ft. at whatever pressure you guys use. Standard flow bench. They are set up for the Woods 400 Tw8 series cams.
Course Bob woods being Bob Woods figured TW8-6 cams at least. May have been right. And shorting up the gearing. Gotta be careful what you ask for with him. So the heads are better that what I'm running. I was hesitant last year, doing better now, but broker.
Wolf is building a engine for a guy I know in Houston, heads flow just about 300cu.ft. Will be on a Ultra. So I guess standard work for him.
Now Wolfgang knows a thing or two about this. He has won the Horsepower shootout at Datona several times. Pretty focused efforts for sure. It's on Woods web site. I'm bragging for him, he won't. But these heads are capable of doing well.
At that time he also worked on the TB and the best got was 240. Stock was 200, (220?) So it's still the choke. I figure a good number would be 300 but I don't have the numbers different TB's flow. Feeding two cylinders after all. I doubt a SE 50cc would do that stock, but I don't know. I figure whatever I get I'm just bolting on. Cost enough as it is.
You guys are great keep it up. I would like to go to Sturrgis, may have time and I'd ride all the way.
Last edited by Old Gunny; Dec 21, 2008 at 08:32 PM.
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Thread Starter
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Road Warrior
Joined: Nov 2007
Posts: 1,984
Likes: 7
Harley came around this area with a demonstration ride van a few (6)weeks ago. I road 5 of the new ones including a SE Fatboy and a SE Ultra. I noticed they both reved free and were nice and snappy, the Ultra surprised me actually, very light feeling.
They come with 50mm or bigger TB's???
This is actually what got me interested in bigger TB. Serves me right.
They come with 50mm or bigger TB's???
This is actually what got me interested in bigger TB. Serves me right.
