Milwaukee 8 Big bore kit disassembly & installation

[Jamie Long]

We are disassembling the motor on our 2017 Milwaukee Eight bike today in preparation of our big bore kit R&D. We will be installing big bore piston/cylinders and testing several custom bore sizes we had made. We will also be testing an assortment of cams, cylinder heads, and other assorted components. We have a load of parts here ready to be tested including injectors, throttle bodies, exhaust systems, clutches, etc.. so it is going to take some time to get thru everything.

[Jamie Long]

Some images with the rocker covers removed:

[Ohio HD]

Nice! I look forward to seeing what the results will be for the upgrades.   

[Jamie Long]

Some assorted images of the M8 engine during disassembly. Motor has just under 2000 miles, and a good amount was on the dyno. I'm not too concerned with the carbon buildup considering we used this bike to develop all of our 107" calibrations so it spent more time than normal in an untuned state. I will say that this motor did not have great ring seal initially, as others have noted with their M8's ours puffed some blue smoke when it was new before the motor got up to temp, however after some miles the smoking disappeared so we were not concerned.

[Jamie Long]

More images of the disassembled M8 engine:

[joe_lyons]

What bore sizes are you guys playing with?

[NCTURBOS]

What bore sizes are you guys playing with?

^^What he said...^^

Will 4.250" be one of them? Going to sign the line on my '17 R.G. tomorrow after work!   

K.

[Jamie Long]

What bore sizes are you guys playing with?

We'll be releasing info on the bore sizes we are testing once we get thru some of the initial testing.

[Jamie Long]

Milwaukee 8 injectors; note dual spray pattern and injectors are no longer identified by a colored band they now use a paint dot on the injector body. The red dot is a 5.5gm injector

[rbabos]

Milwaukee 8 injectors; note dual spray pattern and injectors are no longer identified by a colored band they now use a paint dot on the injector body. The red dot is a 5.5gm injector

Purdy O rings on those. Why are they so big and fat?
Ron

[Jamie Long]

New dual knock sensors & updated engine temp sensor on the 2017 Milwaukee 8 engine.

[joe_lyons]

Milwaukee 8 injectors; note dual spray pattern and injectors are no longer identified by a colored band they now use a paint dot on the injector body. The red dot is a 5.5gm injector

Purdy O rings on those. Why are they so big and fat?
Ron

That's probably just how Bosch sells them

[Tommy D]

Milwaukee 8 injectors; note dual spray pattern and injectors are no longer identified by a colored band they now use a paint dot on the injector body. The red dot is a 5.5gm injector

Jamie,

5.5 OE ?
What mm TB is the MoCo using ?

[Jamie Long]

Jamie,

5.5 OE ?
What mm TB is the MoCo using ?

The factory injectors are 4.35gm and the throttle body is 55mm on both 107 & 114 M8 models

[Jamie Long]

Here are a few of the components we are installing. Fuel Moto big bore kit, Wood Performance M8 directional lifters, high lift valve springs, & Knight Prowler WM8-999 cams.

[FSG]

Directional lifters have only one flat that would go against the anti rotation pin in a TC, how are they going to be managed in an M8 which uses a guide similar to what's in a Sportster.

Does Wood Performance provide a replacement guide?

[rbabos]

Directional lifters have only one flat that would go against the anti rotation pin in a TC, how are they going to be managed in an M8 which uses a guide similar to what's in a Sportster.

Does Wood Performance provide a replacement guide?

Is that a guide or the interference lifter holder?
Ron

[FSG]

That's the new Anti-Rotation Device that replaces the way they did it in the TC's.  These new devices have 2 flats for each lifter so I'm curious as to how anyones directional lifters are going to be fitted. 

I guess there's another Aftermarket Product for someone to make.

[rbabos]

That's the new Anti-Rotation Device that replaces the way they did it in the TC's.  These new devices have 2 flats for each lifter so I'm curious as to how anyones directional lifters are going to be fitted. 

I guess there's another Aftermarket Product for someone to make.

Cool. I guess I should have looked at the breakdown before typing. I see what you are saying. The purpose of a directional lifter still evades me however.
Ron
Ron

[BVHOG]

Woods directional lifters aka Johnson Hylift

[borno]

Maybe O.T. , but those new rocker covers remind me of the old rock 'em sock 'em robots 

[biglew55]

Maybe O.T. , but those new rocker covers remind me of the old rock 'em sock 'em robots 

New contest.... First one to have a red one and a blue one on the same bike wins!! 

[Durwood]

More images of the disassembled M8 engine:

Were you able to use the stock push rod tubes with the FM Twin Cam push rods?

[Jamie Long]

Were you able to use the stock push rod tubes with the FM Twin Cam push rods?

Yes, same pushrods as Twin Cam with stock pushrod tubes

[FSG]

Directional lifters have only one flat that would go against the anti rotation pin in a TC, how are they going to be managed in an M8 which uses a guide similar to what's in a Sportster.

Does Wood Performance provide a replacement guide?

Jamie  what's the deal with the Wood Performance M8 directional lifters?