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Old 03-09-2016, 03:25 AM   #81
thecarfarmer
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Default Re: Hot rod knucklehead build

Oh, ranchodeluxe, I raced against a friend's Multistrada with my 883... I coulda swore I'd shifted my fuckin' bike into reverse, instead of second.

-Bill
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Old 03-09-2016, 08:50 AM   #82
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Oh, ranchodeluxe, I raced against a friend's Multistrada with my 883... I coulda swore I'd shifted my fuckin' bike into reverse, instead of second.

-Bill
Imagine that? 39 horsepower against 100-plus. You do have to know what you are doing. I took for granted that was understood. You would be lucky to run a 15 second quarter mile on an 883. My 1200 streetbike will run tens all day long. Are there faster bikes?, many, but how many can ride them? Again, how many can launch them? The average lifespan of a 600cc Japanese Sportbike is less than 60 days, there is a reason for that.
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Old 03-09-2016, 09:12 PM   #83
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Ohhhhh! Do I smell methanol!?!
Haha no just pump gas.
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Old 03-09-2016, 09:17 PM   #84
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[quote=ranchodeluxe;1823818]
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As far as Harleys not being able to beat sportbikes in a drag race...


I ride both, a Ducati 996 and a few different Sportsters. I guarantee you I would rather race you with my Sportster than try to launch a stock wheelbase Sportbike from a stop light.It takes a highly skilled rider to do a full throttle launch on those animals. Short, tall, shitty clutch,etc. If you watch pro road racers, they are the best at it. I know a few things are going to happen when I drop the hammer on the Sportster: It's going to go straight, the clutch is going to hook, the tire is going to bite, It ain't coming over backwards and I am gonna be outta there. I regularly beat sportbikes at the Sturgis strip with a very streetable 1200, in eighth-mile action. If you can run in the sixes, even low sevens, most guys can't hang. Lots of potential in sportbikes, but not many can ride them worth a damn.
Not sure I'd undertake a Knuck project with that in-mind, but I'm not knocking it either. There are two degrees of cool, in my mind. There's Fonzy cool, then there's McQueen cool. Knuckleheads are straight-up McQueen.
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Checkin' back on this thread to see what madness is transpiring...

Those wheels look beautiful - this is gonna' be one to watch.

Yeah, straight-up McQueen.

-Bill
McQueen cool! That's a lot of expectation for this build. I better get back to the garage!

Hopefully we can all agree that if nothing else this will be fast for a knucklehead haha
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Old 06-05-2016, 04:15 PM   #85
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Default Re: Hot rod knucklehead build

Progress has been slow due to real life getting in the way. I have however got the vast majority of my front end figured out. There is still a few things to figure out for the brakestay/linkage. I also need to take a few pieces out for chrome but the vast majority of my front end has been figured out. Those bars will not be used, just a placeholder for the moment.



Now I can take take the measurements required to modify frame, so that will be the next step.
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Old 06-05-2016, 04:27 PM   #86
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Work on the motor has been been moving forward slowly due to the fact that there are no off the shelf parts for the top end, so I have no good update photos yet. I did pick these bits up from the polisher. Should look good once the motor is ready for them.

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Old 06-05-2016, 04:32 PM   #87
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Default Re: Hot rod knucklehead build

Looking real good, keep the progress rolling slowly but surely.
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Old 06-05-2016, 05:00 PM   #88
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Default Re: Hot rod knucklehead build

I love the 'burger on the springer. One of my favorite looks right there and so clean.
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Old 06-05-2016, 06:54 PM   #89
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I love the 'burger on the springer. One of my favorite looks right there and so clean.
I'm hoping after a few mods to actually have some stopping power as well. More on that when I get further along.
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Old 06-06-2016, 05:21 AM   #90
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Default Re: Hot rod knucklehead build

this is a great build thread and it doesnt come any cooler than a hot rod Knuck....

if it was mine it would be 3 13/16" bore and 5" stroke with a big Leiney in it.....
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Old 06-06-2016, 06:51 AM   #91
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Imagine that? 39 horsepower against 100-plus. You do have to know what you are doing. I took for granted that was understood. You would be lucky to run a 15 second quarter mile on an 883. My 1200 streetbike will run tens all day long. Are there faster bikes?, many, but how many can ride them? Again, how many can launch them? The average lifespan of a 600cc Japanese Sportbike is less than 60 days, there is a reason for that.
Got some photos and time slips from the track...?
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Old 06-10-2016, 08:47 PM   #92
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this is a great build thread and it doesnt come any cooler than a hot rod Knuck....

if it was mine it would be 3 13/16" bore and 5" stroke with a big Leiney in it.....
I really wanted to go 5" stroke, and agonized over the decision. In the end it was cam selection that made me go 4 3/4".

Rocker ratio is 1 to 1 on the Knucklehead. This means all the hot cams for knucklehead make the power higher up in the rpm range since its hard to get good lift numbers. Cam duration and overlap is the only way to get more fuel/air in.

Since I'm going to have to wind it up more to make the power I was concerned that vibration could be more of a problem with the 5" stroke.

These heads are rare enough that for now i want to avoid the extra punishment the lienweber cams dish out on the valve train.

If I'm not happy with the s&s kn421 cam, I will be putting in a lienweber cam next.
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Old 06-10-2016, 10:09 PM   #93
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Default Re: Hot rod knucklehead build

Hello 750Devo -

Agree with Jaws - love the simple clean brake.

A trick the Brit guys use on SLS systems is to reverse the actuating lever on the cam. Puts a quicker (shorter) moment of inertia on the leading shoe. They also make sure both ends of the shoes are free-floating. FWIW.

Fabulous build. LOVE Knucks!

RE: "Got some photos and time slips from the track...? " - I think he is gone.

All the best -

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Old 06-10-2016, 11:28 PM   #94
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Don't know 'bout anyone else... but I'm still here, and still digging this build.

X2 on the bandwagon liking the brake and springer combo.

I has beed told that that style of drum commonly has strength problems on the flanges the spokes go thru. Fact or fiction?

BTW, put a set of Buell takeoff N4's un the 883 and welded up a pipe for it, maybe time to go looking for some Ducatis and Hayabusas now that I'm maybe rockin' 50 HP now!

But enough threadcrapping - we need more Knuck porn.

WN
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Old 06-11-2016, 01:18 AM   #95
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Default Re: Hot rod knucklehead build

Agree!!! More knuck porn.
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Old 06-11-2016, 07:23 AM   #96
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Default Re: Hot rod knucklehead build

Hello the "carfarmer" -

"Don't know 'bout anyone else... but I'm still here, ..." - not you.

We're all GLAD you're still here.

Regards,


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Old 06-16-2016, 02:59 PM   #97
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These showed up in the mail today.

For those that have been following along my knuckleheads have been designed with an evo style combustion chamber, and shovelhead valves. Combine this with the big stroke and odd bore size, and finding pistons that would work has been a challenge.

Ended up getting these through Hammer performance. They are made by Carrillo for sportster motors, but had the correct compression height and valve reliefs for what I am doing. They are lightweight and should give me a final compression ratio close to 10/1 with a 0.04"squish.

Should be getting my cylinders in the next two weeks and then this bottom end can start to go together.
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Old 06-16-2016, 04:38 PM   #98
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Ooooohhhhhh. Like!
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Old 06-29-2016, 09:25 AM   #99
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digging this
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Old 06-29-2016, 11:34 PM   #100
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Is 4 thou enough? Isn't 20-40 the normal range? Just askin.
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