Looking at getting a new bike, but have engine questions... - Road Glide Forums
Engine Related Engine Builds and more for Road Glides

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post #1 of 25 (permalink) Old 07-09-2018, 03:00 PM Thread Starter
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Looking at getting a new bike, but have engine questions...

I'm gonna be updating my RG this fall, and will be doing some extensive engine work over the winter break with hopes to get to 145/145 in a low compression engine. After all, it is a touring bike... right

My delima is should I look at a 103, or look at a new M8 (I could give 2 shits less on the warranty bs...). Both will have bottom end work done, and definitely oil pump upgrades.

My main concern is around the engine, as I believe the rest is pretty much the same (primary, trans, etc....)

Thoughts... Look at 15/16 or 17/18?

2011 RGU Vivid Black <-- FOR SALE | T-Man 555c | T-Max | HD Heavy Breather | Dragos S/C/S True Duals | Rinehart 3.5" w/Turndowns
2016 RG Special Black Quartz | S&S 124 | yaddy yada...
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post #2 of 25 (permalink) Old 07-09-2018, 03:25 PM
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Great Thread - With that kind of HP & Trq, are you looking to swap out the Trans (Baker Grudge) and Clutch (Barnett maybe?) too? You may also consider a welded crank if the motor is all in pieces and not sure of that is different on the M8 vs the TC 103

I know the main issues with the M8 were around trans leaking into the primary at higher RPMs (5K and over for extended periods) and with that kind of motor work, I doubt you want to be short shifting

The 103 is a rock solid platform to build off of and I don't know too much about built up M8s yet but know my old '15 that was pushing 130/140 was a riot......but a lot of "work" to ride with a (7) Speed Trans and a Heavy Ass Clutch and LOUD as the bike was built for speed......not long hauls....so a lot to consider there - 145/145 is a solid build that may or may not come with a sound that might be much for long hauls.......and stock sound systems

Curious to others thoughts

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post #3 of 25 (permalink) Old 07-09-2018, 03:41 PM
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If it was me i had looked at 103 cheaper bike more money into the engine


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post #4 of 25 (permalink) Old 07-09-2018, 05:34 PM
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Here you go.

https://leadingedge-vtwin.com/

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post #5 of 25 (permalink) Old 07-09-2018, 06:21 PM
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I would suggest that you talk to the guy (builder) that is going to put this engine together. The builder must provide input on your cases, heads, cam, exhaust, etc., etc. Of course he will also have to dyno/tune it. As you are well aware, the builder should have extensive experience in this level of build.

He should also do the same for the trans and clutch. Looks over your suspension and rear drive belt needs.

The big thing is he must guarantee it for a few miles, or feet after you leave the shop.
.

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post #6 of 25 (permalink) Old 07-09-2018, 07:54 PM
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After talking with TR at T-Man performance there is no question that I would go for the M8 platform. The link above for the 151" kit is just the tip of the iceberg of what is to come. There are already numerous 120" drop-in kits for the M8 that will get the 145/145 you want and there is no need to bore the cases. Just think of how far the twin cam has come in its lifetime and the M8 is just going to take off from there. I would not worry about the trans fluid migration issue at all because if you are going to do the kind of engine work you stated then it would be very easy to install a fix while doing the work. Plus that issue seems to be so rare that most dealers have yet to see a bike come in that has that problem.
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post #7 of 25 (permalink) Old 07-09-2018, 09:02 PM
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Do google search on sumping issues with the M8 that has a stage 3 or stage 4 kit on it.... You'll want a Twinkie..

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post #8 of 25 (permalink) Old 07-09-2018, 09:19 PM
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Quote:
Originally Posted by ksarauer View Post
I'm gonna be updating my RG this fall, and will be doing some extensive engine work over the winter break with hopes to get to 145/145 in a low compression engine. After all, it is a touring bike... right

My delima is should I look at a 103, or look at a new M8 (I could give 2 shits less on the warranty bs...). Both will have bottom end work done, and definitely oil pump upgrades.

My main concern is around the engine, as I believe the rest is pretty much the same (primary, trans, etc....)

Thoughts... Look at 15/16 or 17/18?
i looked at the M8 as a platform i could build on. 50% more air moving through that pump with the clean burn of 2 plugs and flat-top pistons/cylinder, bigger crank, 55 mm throttle body, etc.
the aftermarket is between a rock and a hard place because they really don't know how far they can build up this engine yet.

imo if you want a touring bike buy an '19 M8 and wait for the trials and tribulations of a new motor. they've gotten us this far.
i think in my heart that they've got a reliable winner. GO FOR A TEST RIDE!!!

if you want a bike night wheelie machine, build up a 103 and hang on.
there are so many ways to look at it...

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post #9 of 25 (permalink) Old 07-10-2018, 01:59 AM Thread Starter
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Quote:
Originally Posted by SteadyEddie View Post
Great Thread - With that kind of HP & Trq, are you looking to swap out the Trans (Baker Grudge) and Clutch (Barnett maybe?) too? You may also consider a welded crank if the motor is all in pieces and not sure of that is different on the M8 vs the TC 103

I know the main issues with the M8 were around trans leaking into the primary at higher RPMs (5K and over for extended periods) and with that kind of motor work, I doubt you want to be short shifting

The 103 is a rock solid platform to build off of and I don't know too much about built up M8s yet but know my old '15 that was pushing 130/140 was a riot......but a lot of "work" to ride with a (7) Speed Trans and a Heavy Ass Clutch and LOUD as the bike was built for speed......not long hauls....so a lot to consider there - 145/145 is a solid build that may or may not come with a sound that might be much for long hauls.......and stock sound systems

Curious to others thoughts
Trans - Yes, I'm looking at doing the Baker Grudge the following year. Just to save a few bucks to start...
Crank - Looking at upgrades there too. Possibly a P3R. I'll look to the builders suggestion here.
Sound - I'm not worried about, I'm pretty loud now.
Clutch - will be updated as well.


Quote:
Originally Posted by MyGlide View Post
Those are impressive, That's a bit more than I'm looking for though!

Quote:
Originally Posted by Wood View Post
I would suggest that you talk to the guy (builder) that is going to put this engine together. The builder must provide input on your cases, heads, cam, exhaust, etc., etc. Of course he will also have to dyno/tune it. As you are well aware, the builder should have extensive experience in this level of build.

He should also do the same for the trans and clutch. Looks over your suspension and rear drive belt needs.

The big thing is he must guarantee it for a few miles, or feet after you leave the shop.
.
Absolutely. Just trying to get some info from others here. I've been to Dragos in the past and have had good luck.

Quote:
Originally Posted by RGKen View Post
After talking with TR at T-Man performance there is no question that I would go for the M8 platform. The link above for the 151" kit is just the tip of the iceberg of what is to come. There are already numerous 120" drop-in kits for the M8 that will get the 145/145 you want and there is no need to bore the cases. Just think of how far the twin cam has come in its lifetime and the M8 is just going to take off from there. I would not worry about the trans fluid migration issue at all because if you are going to do the kind of engine work you stated then it would be very easy to install a fix while doing the work. Plus that issue seems to be so rare that most dealers have yet to see a bike come in that has that problem.


Quote:
Originally Posted by Ohiobellboy View Post
Do google search on sumping issues with the M8 that has a stage 3 or stage 4 kit on it.... You'll want a Twinkie..
I've read a number of sumping issues, I know it's happening, but I don't know how widespread it is, especially with aftermarket builders... Just my thoughts...

2011 RGU Vivid Black <-- FOR SALE | T-Man 555c | T-Max | HD Heavy Breather | Dragos S/C/S True Duals | Rinehart 3.5" w/Turndowns
2016 RG Special Black Quartz | S&S 124 | yaddy yada...
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post #10 of 25 (permalink) Old 07-10-2018, 02:03 AM Thread Starter
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Originally Posted by Ohiobellboy View Post
Do google search on sumping issues with the M8 that has a stage 3 or stage 4 kit on it.... You'll want a Twinkie..
There are problems with the M8, there are also problems with the TC. Just easier to replace a TC if it comes to that

My thinking is getting to those numbers on a NA low compression engine is pushing it more than on a M8.

2011 RGU Vivid Black <-- FOR SALE | T-Man 555c | T-Max | HD Heavy Breather | Dragos S/C/S True Duals | Rinehart 3.5" w/Turndowns
2016 RG Special Black Quartz | S&S 124 | yaddy yada...
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