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107 to 114 oem top end "stage 3"

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  #1  
Old 01-07-2020 | 04:49 PM
Bluesteelm8's Avatar
Bluesteelm8
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Default 107 to 114 oem top end "stage 3"

2017 m8 107 motor currently running bassani true dual headers, powervision tuner, s&s air cleaner... I have purchased 2018 114 oem 500mi take offs oem jugs, pistons, complete heads, stock 114 cam, stage 2 se8-447 cam, 114 oem throttle body all for 300 bucks! Said to have put out 115hp/117tq when it was together. (He upgraded to 117)
Looking for advice and opinions before I do this "bolt on upgrade"
-447 cam or should I go with taller?
-oem 114 throttle body or something bigger? I belive 55mm is stock for 107 and 114?
-port and polish head while I'm there?

I'm into this for next to nothing and am thrilled to be jumping to a 114 motor at the least!
Thanks!




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  #2  
Old 01-07-2020 | 06:04 PM
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Screamin beagle
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I'm no expert but the 107 has a 3.937 bore with a 4.375 stroke while the 114 has a 4.016 bore with a 4.5 stroke...not sure where adding the 114 jugs will land you displacement wise but it's not going to be 114. Are sure those jugs were interchangeable? You might have been better off just having yours bored since you'll have to at least have the jugs deglazed and new rings put on. I'm sure someone smarter than me will be along to help you out lol
 
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  #3  
Old 01-08-2020 | 07:31 AM
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Originally Posted by Screamin beagle
I'm no expert but the 107 has a 3.937 bore with a 4.375 stroke while the 114 has a 4.016 bore with a 4.5 stroke...not sure where adding the 114 jugs will land you displacement wise but it's not going to be 114. Are sure those jugs were interchangeable? You might have been better off just having yours bored since you'll have to at least have the jugs deglazed and new rings put on. I'm sure someone smarter than me will be along to help you out lol
That's what I was thinking too, the CVO 114 accomplishes it displacement with longer stroke. I believe the spigot size may be the same because the aftermarket big bore kits will make the 107 into a 124 and the CVO 114 into a 128. However if the take off parts the OP has are from a stage kit that was installed on a 107 then they may work. OP needs to find out exactly what he has before moving forward. Haven't looked into my M8 deep enough to be sure
 

Last edited by Fat11Lo; 01-08-2020 at 07:32 AM.
  #4  
Old 01-08-2020 | 07:59 AM
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Default C.i.d.

FWIW 4.016 X 4.375 = 110.78 cubes
 
  #5  
Old 01-09-2020 | 10:39 AM
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Long story short after digging deeper you are correct and this will not work due to the different stroke and bore.
Too good and easy to be true!
The stage 3 kit has a larger bore to make up for the shorter stroke in order to get to a 114.
 
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  #6  
Old 01-09-2020 | 01:11 PM
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yobtaf103
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2018 114 oem, so from a softail ?
Most of those parts are the same as your 107 Heads ,tb 114 pistons will not work for your stroke
Cylinders are of use, thicker liner than 107, 114 will bore to 117/120 so new pistons that also match your shorter stroke motor required
 

Last edited by yobtaf103; 01-09-2020 at 01:12 PM.
  #7  
Old 01-10-2020 | 11:24 AM
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Ddieselsmoke
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Originally Posted by Bluesteelm8
Long story short after digging deeper you are correct and this will not work due to the different stroke and bore.
Too good and easy to be true!
The stage 3 kit has a larger bore to make up for the shorter stroke in order to get to a 114.
best to find out now before you took it apart right ?
 
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Bluesteelm8 (01-27-2020)
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