Case Bore Diameter

[Don D]

What is the 107 case bore?

[happyman]

What is the 107 case bore?

am curious  about this myself too, I did think they were the same as the  114 or 117 just less bore?

[ZippersPerformance.com]

[Ohio HD]

That's worth 2,000 words.   

[Nastytls]

Is it an optical illusion or is there a lot of meat on there for a case bore for big inches compared to a twin cam?

[Don D]

Zippers, thank you

[mike jesse]

Zippers, thank you

.164 in.

[HD/Wrench]

Your 114/117 cylinder has a 4.340 spigot OD . 

[HD/Wrench]

Is it an optical illusion or is there a lot of meat on there for a case bore for big inches compared to a twin cam?

It has some thin areas under the deck ..

[Don D]

Your 114/117 cylinder has a 4.340 spigot OD . 

Thin spigots or is it's case bore larger?

[HD/Wrench]

same case bore Don.  You picked up .073 from one cylinder to the next.

[Durwood]

[DTTJGlide]

Has anyone heard if S&S, or anyone else for that matter, is looking to make steel liner drop in cylinders for the M8? With the same tolerances as the TC cylinders it would give you 130 or 134 CI, interesting

[HD/Wrench]

Yes It is in the works .. But some think its more simple than it really is ..  just making a cylinder to bolt on well your are dealing with HD and patents .. And we have already seen that they can stop production on S&S for the "mix" of steel in the liner ..

Taking a OEM cylinder and installing a liner would maybe get you around some of that . not sure.

I do know that there are BIG bore cylinders in the process as we speak for the M8 .. that much I can tell you ..  I hope to be testing them spring ??

[Don D]

The reports of sumping are a deterrent to me. Certainly will be no better with the added displacement.
I don't think anybody has solved that. I wish there was a 3 stage pump but I am sure that will be here shortly by the aftermarket.

[DTTJGlide]

I know it's not a simple or inexpensive undertaking, but thought since S&S has hopefully figured a way around MOCO's patent for the TC that they might be a step ahead on the M8s. It's going to be very interesting to see the development process in the next year or 2. I think right now it's biggest plus is the very good #s on the Stg 2 builds, which is what the largest # of people will be content with, but we all know more is never enough for some on here

[yobtaf103]

Was wondering myself if S&S would come back with a counter punch along those lines

[TorQuePimp]

wiseco had a couple sleeved cylinders at last years expo

4.25 bore seems to work well here....4.312 wont be far behind

[happyman]

wiseco had a couple sleeved cylinders at last years expo

4.25 bore seems to work well here....4.312 wont be far behind

Who is, or will be making the  4.312?

[TorQuePimp]

Harley themselves I'm told

[Don D]

4.5 is in testing.
No idea who the manufacturers are

[sfmichael]

4.5 is in testing.
No idea who the manufacturers are

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[HD/Wrench]

4.5 is in testing.
No idea who the manufacturers are

Well that is a neat trick .  case boring needed ..  Seems a longer way to get there and its not going to be main stream  Where as a bolt on cylinder well now that is easy . Take a look how thin the area under the one side of the case is ..  4.375 square is an option a bit bigger is being made . 131 vs 133 or 135 ?? to me I don't see the reason to go beyond the 131 . Square set up..   stock heads flow very well , add cam t/b and larger injectors lock up and hang on ..  !!!!!


outside of SE new cylinders will be patent issue ??  best guess is yes  in some way or form  , take a stock cylinder and re work it is the next option or what ever you build must not be the same as HD

[Jamie Long]

patent you are referring to is defined twin cam specific

[HD/Wrench]

You can read my mind ?? what one am I referring too ..