Twin Cam Motors Twin Cam 1998 thru 2017

Crank Run Out...

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Old 02-24-2023, 07:21 PM
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Default Crank Run Out...

I Decided to do a minor upgrade on my 103 that's in my sig. I really felt I was leaving some power on the table with the stock throttle body and am going with the HPI 55 mm with 1.710" intake runners to match the ports on the heads.. I'm sure my cam is limiting the high end as well, the Woods TW5-6... That will be replaced with the Woods 888..
So while I got it all apart I checked crank Run out and it was at .005"... Not the greatest but not real bad either... I think I should be ok with that...
I'm contemplating doing the 110" upgrade but not sold on it yet.. Before I took down the cam chest I decided to see how much oil was in the case (sumping?).. I haven't had the bike out in a week so sitting cold in the garage I pulled the plug and with a measuring cup I got 5 oz of oil.. Again not the greatest but not real bad either.. Is this kinda normal..? I'm not to sure when it comes to TC's.. As for the mild sumping should I replace the pump with a better unit? I was thinking about the Fueling OE+ pump and matching cam plate.. It has a little better oil delivery as well as better scavenging over stock.. Not solid on the $800 S&S set up..
​​​​​​ So thoughts or recommendations would be appreciated.. Thanks..
 
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Old 02-24-2023, 07:47 PM
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Your bike is not sumping. Save your money on oil pumps and cam plates. Don't know enough about your motor to comment on any cams. Cold cranking compression test would give an idea where you are at now and where to go from here. Whose stage 2 heads? To what specs?

Edit. Are those Hillside heads? I would ask them
BTW, the Fatboy looks like a fun ride
 

Last edited by tdrglide; 02-24-2023 at 08:15 PM.
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Old 02-24-2023, 08:01 PM
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Originally Posted by tdrglide
Your bike is not sumping. Save your money on oil pumps and cam plates. Don't know enough about your motor to comment on any cams. Cold cranking compression test would give an idea where you are at now and where to go from here. Whose stage 2 heads? To what specs?
My current ccp is 197 with the 37° IVC of my current cam and will be 190 with the Woods 888.. The stage II heads are Hillside 1.94"/1.61" valves with 85 cc combustion chamber.. with porting..
Another question, how is the oil removed from the cam chest area?
 
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Old 02-25-2023, 02:44 AM
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I would save the 888's for the 110 build and then worry about the crank. I've never tried that cam but looks to need more compression and cubes. I would want to see at least 200ccp in the 110
​​​​In your 103 I'm betting it's real soft down low
 
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Old 02-25-2023, 08:00 AM
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I don't leave 5 oz. of oil in my sump. Suit yourself. Those saying a 3 stage pump is a waste haven't run one. My tank is fuller with the same amount of oil. When I tore mine down I had 7 oz in the sump with the stock.pump and plate.
There's a reason most stop at 107 and not 110 if your boring your jugs.

 
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Old 02-25-2023, 09:09 AM
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Originally Posted by tdrglide
I would save the 888's for the 110 build and then worry about the crank. I've never tried that cam but looks to need more compression and cubes. I would want to see at least 200ccp in the 110
​​​​In your 103 I'm betting it's real soft down low
I don't think 6 psi on the ccp is gonna make the motor soft on bottom.. Also with the higher lift a tdc a plus of .031" intake and .042" on the exhaust, I'm sure I won't feel any difference.. The 888's will be around 191 ccp..
 
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Old 02-25-2023, 09:13 AM
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Originally Posted by 60Gunner
I don't leave 5 oz. of oil in my sump. Suit yourself. Those saying a 3 stage pump is a waste haven't run one. My tank is fuller with the same amount of oil. When I tore mine down I had 7 oz in the sump with the stock.pump and plate.
There's a reason most stop at 107 and not 110 if your boring your jugs.

I think that most shops won't go to 110" with stock cylinders (and neither will I) is because the spigot gets to thin and is known for breakage.. It's called reliability..
 
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Old 02-25-2023, 10:09 AM
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Sounds like you've already decided. Good luck

5oz of oil in sump after sitting a week probably has a little bit less than that while running. That's not holding you back
 
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Old 02-25-2023, 11:32 AM
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Originally Posted by 98hotrodfatboy
My current ccp is 197 with the 37° IVC of my current cam and will be 190 with the Woods 888.. The stage II heads are Hillside 1.94"/1.61" valves with 85 cc combustion chamber.. with porting..
Another question, how is the oil removed from the cam chest area?

According to Hillside website, the stage 2 has a 1.9 intake..
 
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Old 02-25-2023, 11:46 AM
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Originally Posted by 98hotrodfatboy
I think that most shops won't go to 110" with stock cylinders (and neither will I) is because the spigot gets to thin and is known for breakage.. It's called reliability..
Thought you were talking about the SE 103 to 110 kit. Those are not standard cylinders bored out. They are special steel liners
 
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