April 1st, 2013, 12:56 AM | #81 |
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after a quick sand and polish. I will end up removing the majority of the imperfections even though its going inside the engine. I really could care less how it looks, just how much it weighs.
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April 1st, 2013, 05:17 AM | #82 |
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Looking good.
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April 1st, 2013, 06:39 AM | #83 |
ninjette.org sage
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thanks. I'm very happy with the way it turned out. I manage to get things pretty even.
This is the final finish. I have a bit more sanding to do on the other sides. I will be dropping it off for the balancing on wednesday or thursday. |
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April 2nd, 2013, 04:45 AM | #84 |
ninjette.org sage
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anyone used Brad Penn Break-in oil SAE 30 before?
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April 2nd, 2013, 04:56 PM | #85 |
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The crank shipped today and will be here Thursday. I also have received all my other incidental items like bearings and seals...plus I got a new exhaust. I am taking the exhaust to the machine shop tomorrow or Thursday. Should be sweet when completed.
I hope to have her up and running by May or before. Then test ride, then dyno. Then ride, ride, ride.... |
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April 2nd, 2013, 07:17 PM | #86 |
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Maybe sometime well have to meet up mgentz and find some nice country roads to tear up once this is completed! Do you go to the slimy crud?
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April 3rd, 2013, 03:04 AM | #87 | |
ninjette.org sage
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Quote:
Did they give you a final weight for your crank? |
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April 3rd, 2013, 05:09 AM | #88 |
ninjette.org sage
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If your wondering if knife edging a crank weakens it, the answer is NO.
The webs aren't stressed. You will find many deep holes drilled in them from the factory for balancing. Much worse than edging. You can take as much weight out of the webs without jeopardising the integrity of the crankshaft. If you gun drill the journals or pins then you will weaken it and have to nitride treat it. |
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April 3rd, 2013, 08:04 AM | #89 |
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April 3rd, 2013, 08:05 AM | #90 |
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I am modifying a consumer exhaust to fit. I bought it, now the machine shop has to modify the header. I will post pics once complete but if it doesn't work it's not worth me telling you.....yet. If you absolutely must know, I bought a Leo Vince LVOne SBK exhaust.
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April 3rd, 2013, 02:58 PM | #91 |
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Alright...I got confirmation from my machinist so I feel confident sharing my tips on the exhaust.
You HAVE to buy an exhaust that attaches to the head using a seperate flange. Area p is welded pipe and does not work. The leo vince does and is comparable to the area p race exhaust. Once you have that sorted out you need to completely remake the flange to fit. The lv is cnc machined to start and the piece going to head is too small to cut and weld without warpage. So my guy is making me two new ones out of 303 stainless and it will fit my head perfectly. For gaskets I am using the area p gaskets that I have and boring them a little to fit. |
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April 3rd, 2013, 06:32 PM | #92 |
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April 3rd, 2013, 06:45 PM | #93 |
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usually its done to reduce drag on the crank when it passes through the oil in the sump, and lightens it abit.
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April 3rd, 2013, 07:06 PM | #94 | ||
ninjette.org sage
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Quote:
Are you going to notice a benefit from this NO. Will you from the lightening. Yes. Why I don't go into it. Do you want to talk why I polsihed it. Maybe it because oil doesn't stick to a shinny surface like it does to a rough one. Makes it lighter again. When they balance a crank, they use a factor of the weight of the oil. You can also determine what weight oil you have to used by measuring your bearing clearances and working out your oil clearance. What exactly to you mean by lightening it a bit? Do you want me to do the math for you how much force a pound of weight puts on a rotating assembly at 14000k rpm. Quote:
Turns out I don't need to change my full exhaust. Last futzed with by tubarney; April 3rd, 2013 at 11:36 PM. |
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April 3rd, 2013, 07:15 PM | #95 |
ninjette.org sage
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On our crank it is so you are wrong, On other cranks thats knife edging purpose because you can't lighten them. You need to make up the weight with mallory.
On our crank, balance factor is not important. Meaning you can lighten it and change the factor without affecting the smoothness of the engine. Thats why you don't remove the balance shaft. You aint going to notice a difference at all from it cutting through mist better. It doesn't sit in a pool of oil. |
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April 3rd, 2013, 07:15 PM | #96 |
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April 3rd, 2013, 07:22 PM | #97 |
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None of its submerged. No web sits in oil. The bottom of them may get a bit wet from splash back.
If anything it would have to cut through maybe a mm or 2 of oil that gets splashed up the cases.. The crank is pressure fed through the bearings. It is also cross-drilled |
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April 3rd, 2013, 07:26 PM | #98 |
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So, is there no point to knife edging ? I have also seen knife edged con rods.
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April 3rd, 2013, 07:40 PM | #99 | |
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Quote:
But think about it bruce. Are you really going to notice the difference? Every crank grinder I have talked to about it says not to bother as it is a waste of time and money. Now even with lightening the crank. I don't know exactly how much difference this is going to make. Pretty much. I did it becuase it cost me $200 bucks in oil and gaskets just to get the crank out. I have spend $2000 dollars on engine work so far so whats an extra $200-300 on grinding at this point. Am I going to notice the difference in the crank after all these mods. Hell NO. Maybe if you did it as a single mod. I'm putting a head, pistons and crank in at the same time. A day after I'm putting in the cams. I also need to get the carbs tuned for no airbox. There is no way I will tell the difference. Last futzed with by tubarney; April 3rd, 2013 at 11:38 PM. |
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April 3rd, 2013, 09:37 PM | #100 | |
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Quote:
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April 3rd, 2013, 09:44 PM | #101 |
ninjette.org sage
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heres the crank. Balanced. Polishing getting done in morning. Its ready tomo.
He said I took a lot of weight out but he managed to get it balanced. He also said I could take more out of it next time. He is going to talk to me about my options when I get there tomo. This is the first Ninja 250 crank Adrian has done so he has learnt a few things now. He was really pleased becaused he managed to get it balanced perfectly. He is going to give me a final weight for my crank. I know you probably don't want to give me yours Mike, since you spent a bit a cash on your crank but I will post mine compared to stock. |
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April 3rd, 2013, 11:51 PM | #102 | |
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Quote:
Anyway, again I must apologise. The last thing I want is to stop someone else from inputing into the discussion. |
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April 4th, 2013, 01:35 AM | #103 |
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all good mate, cant wait to see what else is in store for these. was going to do a similiar thing but ive gone down a differant route with my bike
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April 4th, 2013, 03:50 AM | #104 | |
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Quote:
As for knife edging, weather it be cranks or rods, is to reduce horsepower robbing windage, think of it as streamlining the crank shaft as it rotates through the air in the crank case. |
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April 4th, 2013, 05:57 PM | #105 |
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it's a shame to put works of art into an engine...
she weighs in just under 11 lbs and I can see myself in her. I also had the rods modified for longevity by placing a bronze bushing in the small end and adding oil holes. I'm so proud. crank 1.jpg crank 2.jpg Crank 3.jpg rod 1.jpg rod 2.jpg rod 3.jpg rod 4.jpg |
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April 4th, 2013, 07:42 PM | #106 |
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Dang your making me jealous
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April 4th, 2013, 09:12 PM | #107 |
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Wow
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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
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April 4th, 2013, 09:52 PM | #108 |
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The cases are back together. The crank and balance shaft are in the middle of the clearance range and the rod bearings have been set at the loose end of the range. I used black bearings for this.
Other engine builders suggested this for getting more oil to the rods. |
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April 5th, 2013, 06:38 AM | #109 |
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So I got the cases together, but i have too much into this motor to let some silly piece of dirt ruin it.
Does anyone have any experience with flushing a motor? I have read about filling the case with either kerosene or mineral spirits and draining (repeat till clear). Thoughts? |
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April 5th, 2013, 06:58 AM | #110 |
ninjette.org sage
Name: bruce
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I dont think it would be a good idea to flush it with anything that would act as a solvant. You will end up washing out all your assembly lube and end up trashing your work of art the second you hit the starter button. As long as everything was clean and stearle on assembly you shouldn't have anything in there that the filter won't take care of. If you still think flushing is needed use a thin weight engine oil in large quantity and run it through.
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April 5th, 2013, 07:24 AM | #111 |
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Maybe you know or read this already but if not, here's good info about break in an engine http://mototuneusa.com/break_in_secrets.htm
I wish you good success and fun with the engine and before I forget it's a nice build |
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April 5th, 2013, 07:32 AM | #112 | |
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Quote:
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April 5th, 2013, 07:37 AM | #113 |
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You put the motor together with dirt in it????
Go sit in the corner. NOW Then it is to the black board with you. "I will clean every part of the motor to with in an inch of its life. Then clean it again. " One million times. Flush it with motor oil only.
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April 5th, 2013, 08:04 AM | #114 | |
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I may also have OCD. |
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April 5th, 2013, 09:02 AM | #115 |
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Don't worry. Is the top end on yet ?
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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
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April 5th, 2013, 09:53 AM | #116 |
ninjette.org sage
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Not to change the subject, but do any of you know if there is any one year engine thats better than the other ? Also, does the pre gen engine bolt in to the 08 and up chassis?
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April 5th, 2013, 10:02 AM | #117 |
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April 5th, 2013, 10:03 AM | #118 | |
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Quote:
As for streetability, the 08 tends to be better. |
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April 5th, 2013, 12:03 PM | #119 |
ninjette.org sage
Name: bruce
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Here are some rumors that I have heard;
1st year ( 88 I think ) had the most cam duration. Pre gens have bigger exhaust valves and ports. Pre gens require some bolt hole mod to fit in new gen bike. I know about the tensioner issue, but is that correctable with a mechanical One ? Also, can you go 4mm over on the cylinder block without boring the case ? |
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April 5th, 2013, 12:06 PM | #120 |
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OOPS ! Forgot one, can we get some clarification on eliminating the balance shaft? In one thread everyone poo pooed that idea then later said it could be done. My engine will only be for track use in the 6000 to 14000 rpm range.
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