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

Searching for M8 head specs

 
  #1  
Old 07-08-2018, 04:25 AM
Shotgun Lily
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Default Searching for M8 head specs

Hey everyone! Iím new here and this is my first post so here goes. Iíve got a really dumb idea for a custom engine build that Iíll be starting to work on hopefully around Christmas time so Iím using the specs on the parts that I find on the internet to kind of theoretically blueprint everything out ahead of time. Ive been looking around and gathering some specs on parts I think Iíll use and I plan on running the parts/numbers by a knowledgeable source when itís closer to when Iíll start gathering parts, but thereís some info Iím struggling to find.

Iíd like to do something custom for the top end of the engine involving the four-valve head found in the Milwaukee Eight (M8), so Iíve done a fair bit of internet reading into the engine. I came across an article some time last week that I thought had the specs on the valve angle (I believe) relative to the face of the piston, but now I canít find it. It took me a few days just to find the valve specs, which I found on an aftermarket site (Kibblewhite Precision Machining to be accurate) so it could be wrong and Iím not finding anything to verify it anywhere, so Iím lost as to where to go from there to find the specs Iím looking for. The specs I did find were:

Intake Valve
1.571Ē valve diameter
0.2347Ē stem diameter
4.015Ē stem length

Exhaust Valve
1.264Ē valve diameter
0.2342Ē stem diameter
4.050Ē stem length

I believe I also read that the stock head chamber was 88cc but again Iím not completely sure.

If anyone knows if the above is correct as far as size of the valve is concerned, and also what the valve angle is relative to the piston face Iíd be really grateful for the help. Thanks for letting me hang around.

(Bold for simplifying/emphasis. I write a lot sorry.)
 
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Old 07-08-2018, 04:44 AM
Kingglide549
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What is your idea may I ask ?
 
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Old 07-08-2018, 03:46 PM
Shotgun Lily
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Originally Posted by Kingglide549 View Post
What is your idea may I ask ?
Iíve got a thing for the Shovelheads. I was reading online one night and came across the article about the M8, and the concept of a M8 chamber/valve setup in a Shovelhead package appeals to my problem-solving side. Maybe work the angles out on paper then model it in Solidworks or some other 3D modelling/printing program, then get it CNCíd. Canít find the article anywhere anymore though. I think itíd be a good challenge to try and stuff it in that package somehow. Set the whole thing up with an Ultima bolt pattern thatíll match the case/cylinder combo I have in mind and see if it works. Itís dumb, I know, but itíd be a cool one-off and hey, I figured if the specs are here itíll help someone else who might be curious too.
 
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Old 07-08-2018, 04:28 PM
Kingglide549
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There have been lots of 4 valve heads already made for the shovel.
A newer 4 valve is a shell trick, look here!
No over here!
Harley has just discovered a new fad to sell the M8 that is all .
It is a slow turning engine and breathing is not so much the problem.
More of the combustion chamber arrangement, porting problems is.
The proof is the unattainable 1.35 hp per cube no matter what they do,
-which is very EZ in other configurations on other engines.
Look up Other engines and compare.
 
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Old 07-08-2018, 05:32 PM
Shotgun Lily
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Originally Posted by Kingglide549 View Post
There have been lots of 4 valve heads already made for the shovel.
A newer 4 valve is a shell trick, look here!
No over here!
Harley has just discovered a new fad to sell the M8 that is all .
It is a slow turning engine and breathing is not so much the problem.
More of the combustion chamber arrangement, porting problems is.
The proof is the unattainable 1.35 hp per cube no matter what they do,
-which is very EZ in other configurations on other engines.
Look up Other engines and compare.
Definitely an option. Iíve seen the four-valve Shovel replacement mentioned in an article I read and Iíll take a closer read into it. The case and cylinders Iíd be putting them on would be the Ultima case (part no. 206-49) Evo-style with the Ultima pattern which has the through-studs and 4.250Ē bore, so if they meshed itís an idea to chase.

I could just go with the Sorenson Performance head which has the big-bore space to match but itís five bolt and Iíd like to take advantage of the through-stud four bolt setup that comes with the Ultima case. Cylinders would obviously be something with the four-stud run through. Iíd have to get the heads undrilled if I went that route and drill my own bolt holes to match them, and Iím not sure if thatís a possibility. The chamberís pretty big too and Iíd rather run flat pistons with less skirting and height on a shallower chamber than a taller domed piston with taller skirts and a hemi chamber, mostly to cut down on heat soak into the head and a personal distaste for domed pistons.

The four-valve idea using the M8 setup appealed to me on a few different fronts. If it broke or went bad, stock or aftermarket parts could be used because hopefully the geometry would be the same and make it easier to source the moving parts. The second was valve area, which Iím probably wrong but should be bigger than a SP head as the two valves together should allow more area than the single valve while cutting down on chamber surface area for heat soak. The chamber shape I also liked because it would allow a flat piston or even the dished piston from Wiseco (part no. 40182PS) and, again, the logic behind limiting heat-soak into the head from an article I had read made sense. Finally, it was something for me to think about and work on making work, which is never a bad thing in my opinion, and when I had trouble finding the information I joined the forum so hopefully if anyone else was curious the information would be out there.

Iím totally self-taught so thereís probably lots Iíve screwed up in my line of thinking, but if nothing else it gives me an important opportunity to learn and maybe come up with something really cool. I mean, why do the normal when you can make something unique and learn while doing it?
 
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Old 07-08-2018, 07:03 PM
Kingglide549
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Chasing the VE of an engine is done 24 hours a day, But I would strongly suggest you not reinvent the wheel.
Read all you can by Mondello and others that share.
Remeber water is about 800 times heavy then air (Cheep flow bench) (and perhaps more real)
CFM is not even 1/2 the equation to chase, its the 1000 other little details and nuances.
Fueling made 4 valve heads as well as others.
None paid well or worked well or we would all be running them.
Like I said -HD has a new shiny object for everyone that has no clue for what the formula 3,4,5 adds up to.
To them -
Its 4 valves to them and should go faster LOL, ........when they get it on the other side of 1.35 HP per cube (NA) I will concede they finally got somewhere.
Wating.......................


https://www.engineeringtoolbox.com/w...air-d_854.html
 
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Old 07-08-2018, 07:25 PM
Shotgun Lily
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Okay, for the sake of the initial intent of the thread Iíll concede that itís just a shiny stupid idea and itíll go nowhere. Just a thought exercise I guess, or a one-off project. Always was anyway. Itís what I think about when Iím bored.

Going back to the initial intent of the thread, then, all I wanted to know was if anyone had the data on the head itself and what the numbers were i.e.: valve stem angle, valve diameter, chamber volume. Figured itíd help someone somewhere to have the data in one spot. I really appreciate the help, everyone.
 
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Old 07-09-2018, 04:25 AM
Peter Quinn
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Sorry Shotgun,This M8 thread is filled with executioners.Bring your Ideas,dreams and passion and they will kill it! Dont give up !
 
  #9  
Old 07-09-2018, 04:47 AM
Shotgun Lily
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Haha thanks. Its been six years and this project idea of mine isnít dead yet, just evolving. Think Iíll ask the MoCo via the service line today and cross my fingers. Otherwise I eyeball a photo from the press release and start guessing!
 
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Old 01-11-2019, 03:50 PM
Shotgun Lily
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New year, same old shenanigans. Iíve acquired a Shovelhead head and just purchased an M8 oil-cooled head. Once it arrives Iíll measure everything that it strikes me should be measured on the M8 head and post it here. I also stumbled onto a couple images online from the service manual concerning oil flow through the heads so thatís a bonus. Iíll pick up an angle finder, machinists rule, and a dial caliper in a week or two as well.

If all goes well measurements should be here in a month or two. Then the fun begins.
 

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