Milwaukee Eight (M8) 2017 and up M8 Air and Liquid Cooled discussion
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131 Crate engine

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  #21  
Old 01-11-2021, 08:26 AM
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Originally Posted by Rail
Your run is a lot smoother than mine. He did get all he could out of it based on other 131 Stage 4 dynos I've seen..

Attachment 604100
​​​​​​​I wouldn't pay any attention to those peak numbers, what would concern me would be that curve, I would say something is definitely off, either the tune or something is not playing nice (exhaust etc)
 
  #22  
Old 01-11-2021, 08:53 AM
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I see you are getting a lot of recommendations for motor mods. That's great! Don't forget that even with just going well built 114 your drive train will need some attention, Your clutch and compensator's reliability will be over stressed. The drive train isn't designed for the horsepower and torque that a hot 114 will produce. An upgraded clutch basket, hub and springs would be a great idea. Clutch Hubs are known to strip out at the splines, and Clutch baskets break under increase power. They are designed to work well with stock motors not with double the horsepower and torque. Darkhorse makes a great compensator. A built 131 will make that situation way more critical. Good luck and enjoy the bike. Hot Rods are fun but they are expensive.
 
  #23  
Old 01-11-2021, 12:54 PM
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Originally Posted by FLSTFI Dave
Is yours the complete kit, or did you have some parts changed? Peak numbers seem about the same, but the torque curve is not very smooth like most runs I have seen
Complete Stage 4 kit and I agree.. I'm not so concerned with the peaks but that curve kinda sucks.. When I talked with them they said it needs more fuel in rhat area but the HD tuner won't let them put more in ..
 
  #24  
Old 01-14-2021, 10:26 AM
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Originally Posted by FLSTFI Dave
Save your money, do a Harley Davidson Oil Pump, the 2020 8 lobe pump. Works great even on very high HP and torque builds. Some of the well know builders mentioned have quit using the S&S oil pump to go to the HD 2020 version. I have been running it for 21,000 miles on my 163HP build.

As for the CVO air filter, probably will not flow enough they are border line flowing enough for a HD version of a stage 2 which is less power than your looking at. The Harley Ventilator Extreme will handle it, which is what HD recommends for their 131 kit.
Any details on your 161hp build? Im in the market for a new engine combo in that range. Who did the work? Bore stoke ci etc... thanks.
 
  #25  
Old 01-15-2021, 07:23 AM
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Originally Posted by Junker
Any details on your 161hp build? Im in the market for a new engine combo in that range. Who did the work? Bore stoke ci etc... thanks.
A friend and I did the build. The build is pretty much in my signature. Stock 117 stroke. S&S 128 cylinders bored to 130.
 
  #26  
Old 01-15-2021, 07:26 AM
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Originally Posted by Rail
Complete Stage 4 kit and I agree.. I'm not so concerned with the peaks but that curve kinda sucks.. When I talked with them they said it needs more fuel in rhat area but the HD tuner won't let them put more in ..
There is something not right. A good friend has a 2020 RGS with the 131 kit in it. All HD parts. His curve is nice and smooth. His is with HD tuner, HD exhaust and all.
 
  #27  
Old 01-15-2021, 01:04 PM
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Originally Posted by fmlawn
try tts 250 cam...run ..30 head gasket...you will love it
Maybe in 131 but not a 114”.
 
  #28  
Old 01-16-2021, 08:25 AM
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Originally Posted by NorthWestern
I like this guy already!

You can build what you have, with better aftermarket parts, but if you have your heart set on that 131 crate, just go with a Woods 22XE, and then tune her with a PowerVision from Fuel Moto.

You will not be disappointed.
what he said.
 
  #29  
Old 01-16-2021, 08:36 AM
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Originally Posted by gman6489
After careful consideration and talking with some friends I’ve decided to scrap the 131. I’m going with the redshift 468 cam D@D Billet cat and Powervision tuner. I’ve also ordered the S@S cam plate and high flow oil pump. They tell me on a 114 I can get 130+ torque and about 110-112 horsepower. I’d be extremely happy with that considering how the 114 runs stock. I’ve always loved the power on my bike. I think this route is way more reliable and economical. On Harleys website it says the 131 gets about 131 ft lbs of torque. I can’t see spending all the money for a crate engine when I can get there with a cam and good tune. Im not really chasing horsepower either. This should be a significant upgrade over stock. I’ll keep you posted on how it goes. Thanks fellas I appreciate all the tips and advice! Ps do you think I need to upgrade the air cleaner too for this build? I think mine is high flow cause it’s a CVO. Just curious
Gman
wise choice
 
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