TWIN CAM BORE SIZES AND CYLINDER WALL THICKNESS EXPLAINED
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- čas přidán 26. 08. 2024
- Cylinder wall thickness is the measurement of the material that makes up the walls of the engine's cylinder, which houses the piston. It is the distance between the inner surface of the cylinder, where the piston moves up and down, and the outer surface of the cylinder that interfaces with the engine block or cooling jackets.
*Importance of Cylinder Wall Thickness:*
1. *Durability:* Thicker walls can better withstand the stresses and pressures generated during engine operation, reducing the risk of cracking or deformation.
2. *Heat Management:* The thickness of the cylinder walls affects how heat is dissipated. Thinner walls can dissipate heat more quickly, but they must still be thick enough to maintain structural integrity.
3. *Performance:* Proper wall thickness helps maintain the precise shape and alignment of the cylinder, ensuring optimal performance and efficiency.
4. *Engine Longevity:* Adequate thickness ensures that the cylinder walls can endure prolonged wear and tear, contributing to the overall longevity of the engine.
Harley-Davidson engineers their engines with carefully calculated cylinder wall thicknesses to achieve a balance between strength, heat dissipation, and weight. Too thick, and the engine might become overly heavy and inefficient at heat management; too thin, and the engine might suffer from durability issues.
cylinder wall thickness
Twin cam 110
Twin cam 107
Twin cam 103
Twin cam 98
Twin cam 95
Twin cam 88
This is easily the best bike content on youtube, in my own opinion.
That’s by far the best explanation of bore sizing and the potential issues with just going bigger without fully understanding what’s involved. Hats off to you for the easy-to-understand explanations. 🤜🏼
Really good communication and tec. Knowledge.
yeah,the pain of H-D preformance,very well explained sir keep up the good work.
This video shows very well that bigger is not always better.😁☝️
I thought you could buy 110 cylinders so don’t have to worry about this… but I like the way you explained everything
I built a 02 FXDL zippers/s&s 95 from an 88. I went all gear drive. This was 2008 and the engine has been rock solid all these years. You mentioned people who really care for their bikes and that is the X factor. Great Video. Sub’d 🤙🏽
This video is great if you assume you're getting all the cubes from boring alone. There's also stroke that can help, which would leave thicker cylinder walls than from just boring. Also, at least for the HD 110 kit, it comes with steel-lined aluminum cylinder walls, which adds strength back in. Just some thoughts.
Currently building a s&s 124 hot set up kit . Had my crank case machines to accept bigger cylinders. I really hope it lives up to it's reputation and lasts a long time.
Much appreciated bro, sadly there are some who do what you do but cannot seem to explain it like you do. Thank you for doing what you do.
I had the 4 inch bore S&S Sidewinder 100ci kit. I was far too scared it was going to explode on me. Opted out of that and went with boring my 88ci to 98ci done @ hammer performance set with very nice CP Carillo pistons. I’ve heard really good stuff about the 98’s, but I may buy a new set of original 88’ pistons and cylinders just to have on stand by JUST in case. Great video man.
New favorite bike channel! Keep killing it!! 💯
@@ewm000 hey thanks my dude! Ring the bell 🤘🏼
Another amazing video!!!
I flunked high school so bad because I had no interest if they had taught me about math and science in relation to bikes like you do I think I woulda passed lol
@@Stay_smiling_garage well you’re in luck bubba. Good ol’ algebra is coming back. Haha
Brother thank you for your heartfelt comment! I too struggled with math mostly due to pisspoor teachers that don’t care about students that aren’t grasping concepts without practical applications. Ironically I teach others now that were marginalized by their teachers… Learn it yourself 🥇💯🏁
The true 110s had bored out cases with thicker cylinder sleaves. They had their own problems with higher valve spring tension that was hard on the cams.
Thank you for sharing this information. You helped me better understand what my mechanic was trying to explain to me when discussing the cvo dynas and why to avoid the 110.
@@1armhombre awesome! Glad to hear it! Sounds like you have an excellent mechanic instead of a money hungry one. 🤘🏼
This is super informative. I was considering a 107 kit for my 96. I think I'll just get the heads polished and get a good cam instead. That or if I do I'll get fuelmotos heavy duty cylinders.
I have a stock 2003 twin cam 88.
After seeing all the knucklehead ideas the factory came up with while building these I wouldn't dream of adding more than a mild cam to this engine without a COMPLETE engine build from the ground up.
The reason is I don't trust the stock crank at all.
I’m building a high comp (12:1 & TW999 cams) 103 currently
This is why I didn’t go 107 I guessed at what you showed in this video
Great work thanks
You do a great job with passion and understanding
That Spigot! I'm all about reliability and glad I stayed at 3.937 for my 107...
@@BuildRideRepeat smart man!!
just did a 106” on my 2011 dyna
and now im scared 😂 im not a stunt rider who constantly hit the rev limit but i do like to ride fast and drop some gears into corners
Outstanding cam .
@@darylthompson5071 thanks man!
You the man!
Good info for your clients and smart video… but case boring is the alternative for 110”
@@tobpitbull that’s where we’re going next! No spoilers hahahaha
Dude you are putting out awesome and easy to understand content. Keep it up.
Secondly would you happen to know the cylinder wall thickness of a stock 110? Are those make out of the same cylinder heads?
My TC 103ci crapped out last year...
It was still under extended warranty so I had my local Harley Davidson Dealership convert it to the TC 110ci, that's the engine that came on the later CVO's...
Harley Davidson paid 6K for the engine... I paid 2.4K for the Screaming Eagle parts...
Very good show 👏 I went with a Zippers Muscle 107 Kit I have a oil kooler and Love Jugs Mighty Mites D K Custom oil filter I have fun with it but I don't beat on it My temp on the oil tank stays around 200 to 210 tops all day long 😀
Excellent content!
@@johnkennedy3174 I appreciate you!!
Would you install a stroker crank/flywheels instead, to arrive at those increased displacement
sizes?
Cool
I do not like "Drop In" 110 cylinders because of the super thin skirt. The 107" is the limit with out case work. That being said- It is NOT a problem to bore Twin Cam cases for larger cylinders. It does NOT affect reliability at all. Lengthening the stroke often decreases reliability but a bore increase should not. I have built some very large Twin Cams that have "Stock Like" reliability.
What about aftermarket cylinders that are made larger? S&S or Fuel Moto? Do they not retain the cylinder wall thickness?
Good job bub. Thank you.
@@boxcarbro3043 no problem my dude that’s what I’m here for! 🤘🏼
thanks for this explanation. I have a downed 50K 2011 96" TC because the piston in the front chain tensioner pushed through the shoe and the metal piston was being chewed up by the timing chain. I was scratching my head on build direction. Question, will boring the cylinders to a 103" require mods to the crankcase? As I understand it, my cylinders would need to be bored out .125". Keep the videos coming.
absolutely killer. very in depth and informative, how would this translate to a 107ci to a 124ci? any chance you could do a video like this on the m8 motors?
I have a 80ci evo would love to know more about that engine 🤙🏼
Great video.
Recently found your channel man you know your stuff, i love seeing this stuff broken down. Do you mostly do twin cam builds or have you ever hopped up any evos?
Had a 110 screaming eagle CVO NOTHING but Problems!!! Cheers
Hey Cam, real quick. Can you get thicker top ends to maximize your bore size without the risk?
@@joesaysstuff5802 we’re going to dive way into that in more advanced videos. But long story short, yes. (If I understand your question correctly.) the process behins by removing the bottom end from the motorcycle. Removing the crank and the cylinder studs from the bottom end and reassembling it (so it’s just a hollow bottom end. We then bore the cases bigger and wider so we can install aftermarket cylinder with a bigger diameter. S&S makes kits 🤘🏼 this is how people get huge engines like 124 out of stock cases. Or my favorite engine of all time, a 4 inch bore with 4 inch crank (square)
Well, what about case boring for bigger diameter jugs with more sleeve thickness
This is for boring stock jugs right? Does that wall thickness also apply to after market jugs?
In regards to building a motor with the purpose of stunting on a 103 platform, would you use lower compression pistons and forged or cast due to the bikes getting hot and the forged expanding more then the cast. What would you do?
dude..... this ice deadly info
What would you recommend for someone that daily drives their '02 Dyna, but ride it hard at times (110 mph+ for 5-10 miles at a time) but not hit the rev limiter?
Hi Cam can i put a 4 3/8 aftermarket crank in 2002 cases so i dont have to do a Timken conversion to my 2009 cases,i believe that 2002 cases have crank position senser.
Might’ve just saved me a couple grand. Does the S&S lack wall thickness? Or only stock heads that have been bored out?
Harley and S&S does it by using a stronger steel sleeve 💪🏾.
I know lots of people with twin cams at about that Harley tire shredder 110 kit 😊
Yes they use a ductile iron for the 100/110 kits
Paying to have new pistons fitted using proper torque plates should be factored when comparing aftermarket kits ready to bolt on. Not every machine shop does good work either. (I bought my own torque plates and take my tech data to a local race engine builder, he measures the bore with his dial bore gauge then tells me what oversize is required, then I buy the parts and he's happy while I get the work done to spec.)
So what you’re saying is if you want a bigger motor buy a bigger motor. I’ve thought about doing a 110. But you pretty much talked me out of it.
@@therealclippy4224 I will always support that. But this is in reference to boring out stock twin cam cylinders.
What stock bore cylinders do you recommend? Smoked crank bearings in my 88 and want the most reliable rebuild with 525 camchest kit
👍🏽🤘🏽‼️
3.75" does me just fine...
Is the 103 bored out wall thickness the same as what comes straight from the factory 103
I was wondering the same thing
@@2540micky the case bore doesn’t change so yes. The 103 is a 3.875” bore
Put ss 4” big bore it will be fine
So is that how a factory 110 is or do they have different sleeves that are thicker
@@MrRunWO no! Great question. A factory 110 comes with a bigger spicket diameter in the cases
Yo cam, since you are getting only .030in for a big bore 110 and running a high risk to melting that thing, what’s the difference with the new M8 117 models?
@@wulxy1617 hey great question. We will look into this in future videos 🤘🏼
Is there anyway to make a thicker cylinder with the sole purpose of boring it to a 110?
Yes, but the cases have to be bored to accept the thicker liner.
@@Hunter-qm4of is that were it gets dicey?
@@Justin.008 yes! We are getting to that in future videos. 🤘🏼 we will be splitting a bottom end and boring out cases to show you how much more we can get out of a twin cam
@@Gnarlys_Garage ill be tuning in
@@Gnarlys_Garage thanks for learnin me some stuff
🤦♂️ not me with a 110ci…great! If I upgrade to the bolt on aftermarket 117ci is that any better?
Mine is stock 110ci. Is that cylinder wall thickness still the same or different because of bore?
@@sekaevans1105 no! This is in regards to boring! The stock 110 from the factory had a bigger bore diameter in the case! You have bigger cylinder. Nothing to worry about and you’re safe. You could however go up to a 117 ahah that would be the going 110 equivalent
@@Gnarlys_Garagethank your very much for your reply what a relief. As I’ve mentioned once before I enjoy your content and will continue to follow and support you. Cheers 🍻