HarleyTechTalk

 I just bought a 124 LC  crate motor, going to use my 55/58 throttle body and Dragula 2 exhaust, what kind of power and torque should I expect from this set up?

S&S will give you a better answer than anyone here.

I think several here can give you a very real idea of what to expect. Here's some 124 LC crate dyno's. Keep in mind, exhaust, who tuned, conditions, and the fact that no two dynos read exactly the same, but these are real numbers.


http://harleytechtalk.com/htt/index.php/topic,84594.msg950725.html#msg950725

http://harleytechtalk.com/htt/index.php/topic,86972.msg986207.html#msg986207

http://harleytechtalk.com/htt/index.php/topic,85134.msg1046483.html#msg1046483

http://harleytechtalk.com/htt/index.php/topic,89618.msg1027336.html#msg1027336

Quote from: conmag on December 30, 2016, 01:29:15 PM
I just bought a 124 LC  crate motor, going to use my 55/58 throttle body and Dragula 2 exhaust, what kind of power and torque should I expect from this set up?

I have a 58 hpi tb and a Rush Wrath 2 into 1 , as a stock lc engine it made 129 to 130  and 140 torque . With a little help , more compression and better heads that engine can go to the low to mid 140s square

Mid 120'S to low 130's HP  and mid 130'S TRQ with a good tune.  I do quit a few of them

Here is a example of a SS 124 with a 585 camshaft , flat top pistons I think.         http://harleytechtalk.com/htt/index.php/topic,64790.msg1104200.html#msg1104200   I should have said low 140 square                                   

It should,  will  pull a EZ HP per CI as in any engine in any relative good tune.

Quote from: thumper 823 on January 02, 2017, 07:16:50 PM
It should,  will  pull a EZ HP per CI as in any engine in any relative good tune.

Not sure what you mean by that? Takes a pretty good HD (or any other) engine to pull 1 hp per cubic inch... and more than just a tune to get there

Quote from: sfmichael on January 03, 2017, 12:45:59 AM

Quote from: thumper 823 on January 02, 2017, 07:16:50 PM
It should,  will  pull a EZ HP per CI as in any engine in any relative good tune.

Not sure what you mean by that? Takes a pretty good HD (or any other) engine to pull 1 hp per cubic inch... and more than just a tune to get there

Agree, none of the stock head, stock cam HD twins will make 1HP per cube without motor work.

The Harley people have a bad habit of leaving HP on the table like no other manufacturer!
This is old news.
  Chevrolet ESt this as base line a long time ago 1950s 0r early 60s.
Time marches on.
The Vtwin seems to have been left behind because the Harly culture does not want to catch up.
If you wish to spend some time on engine dynamics, most any engine is quite capable of a one  to one  ratio.
Perhaps a flat head will not LOL
So if you are not producing at least one per cubic you have an engine detuned or just plain made wrong.
Chances are a correct cam shaft will perk it up.
HD is known for selling anemic engines at high prices then reselling their crap to make right .

Quote from: sfmichael on January 03, 2017, 12:45:59 AM

Quote from: thumper 823 on January 02, 2017, 07:16:50 PM
It should,  will  pull a EZ HP per CI as in any engine in any relative good tune.

Not sure what you mean by that? Takes a pretty good HD (or any other) engine to pull 1 hp per cubic inch... and more than just a tune to get there

My Kawasaki 500 was 30ci and came with 60hp. When I was done it was 90hp.
http://www.motorcyclespecs.co.za/model/kawasaki/kawasaki_h1%20500%2070.htm

Quote from: thumper 823 on January 03, 2017, 03:42:45 AM
The Harley people have a bad habit of leaving HP on the table like no other manufacturer!
This is old news.
  Chevrolet ESt this as base line a long time ago 1950s 0r early 60s.
Time marches on.
The Vtwin seems to have been left behind because the Harly culture does not want to catch up.
If you wish to spend some time on engine dynamics, most any engine is quite capable of a one  to one  ratio.
Perhaps a flat head will not LOL
So if you are not producing at least one per cubic you have an engine detuned or just plain made wrong.
Chances are a correct cam shaft will perk it up.
HD is known for selling anemic engines at high prices then reselling their crap to make right .

The point was, not just a simple tune will make a stock HD give out 1HP per cubic inch. It takes some motor work.

The Vtwin seems to have been left behind because the Harly culture does not want to catch up.


IMO "catching up" is not the allure of the aircooled these couple of decades, that what the Vrod was for. I probaby wouldnt have 3 of them if they anything other. Making an antique aircooled engine design make power for me is the allure.

Quote from: gordonr on January 03, 2017, 05:52:46 AM
The Vtwin seems to have been left behind because the Harly culture does not want to catch up.


IMO "catching up" is not the allure of the aircooled these couple of decades, that what the Vrod was for. I probaby wouldnt have 3 of them if they anything other. Making an antique aircooled engine design make power for me is the allure.

Yes...and I love the simplicity of an air cooled engine. Getting pretty hi tech in all other regards, but I love my V Twin

 

My Dad gave me a Shot of DOPE when I was 5 years old... BIG Needle Full...

It took many years to take hold and when it did, I was Addicted...

HARLEY was the Needed Fix from then on...But where does it STOP?

Often times I USED TO resent the modernization made into the Harley... BUT.... bought me a 09 FLHR v-twin ? ? ? is that Far enough... was 96 to 103 then DD7speed... 

I have given a LOT of thought of putting an SnS 124 LC in-front of that tranny...Then it would Really be 

My Dad would have Probably given me another Big Needle full of "Old School" IF he could see where I am today...

UNTIL HE RODE IT........

signed....BUBBIE

Quote from: BUBBIE on January 09, 2017, 04:34:02 AM


My Dad gave me a Shot of DOPE when I was 5 years old... BIG Needle Full...

It took many years to take hold and when it did, I was Addicted...

HARLEY was the Needed Fix from then on...But where does it STOP?

Often times I USED TO resent the modernization made into the Harley... BUT.... bought me a 09 FLHR v-twin ? ? ? is that Far enough... was 96 to 103 then DD7speed... 

I have given a LOT of thought of putting an SnS 124 LC in-front of that tranny...Then it would Really be 

My Dad would have Probably given me another Big Needle full of "Old School" IF he could see where I am today...

UNTIL HE RODE IT........

signed....BUBBIE

Bubbie I went for 96 to a 103 to a LC 124 and never looked back. The LC 124 is a good touring package .  It depends on where you want the power and how much. I just like the rush I get now from the bike pulling . I don't drag race but when you roll on the throttle now it responds pretty good lol Jim

I tried asking once before, and I know it has been addressed before, but what is the main difference between the LC and HC motors? Can the HC be pressed into touring duty?

Quote from: Hossamania on January 09, 2017, 08:10:19 PM
I tried asking once before, and I know it has been addressed before, but what is the main difference between the LC and HC motors? Can the HC be pressed into touring duty?

to my knowledge the primary differences are the compression ratios and the cams

many run the HC in a touring capacity and I think either would work fine, just think the LC is likely more touring friendly

wish I could tell you I had first hand experience....debating about building a big motor...but then think I should update to the M8 

I have a HC 124 I installed in my 2007 RK. I installed that when when I blew the previous 117" motor. (thanks to California Phil for an awesome deal on the crate motor)

It has compression that is a little over 10:1 & the 640 EZ start cams which make it ridiculously easy to start both hot or cold.

Although the LC may be a hair better for touring cross country, I'm pretty sure the HC would work fine also.  Mine is super smooth in traffic running a 58mm TB/5.3 injectors-Dragula2>1 & Thundermax closed loop setup.

If I take it easy on the throttle (which I almost never do) it gets close to stock mpg. I have ridden it 600 miles in a day with no problems at all.  I had replaced the compensator with the latest SE version & use the Baker Attitude adjuster.  It is as smooth as any stock motor & totally reliable.

It is also great fun to open it up letting the Pingel electric shift handle all the shifting at 6300 rpms.  Here is a quick video I made when I was testing out a Go-Pro 4.  You can see the dyna shift minder light up as it hits 6300 rpms & then does full throttle upshifts without any rider input at all.



Then when I go touring, I throw on a CVO windsplitter & wear a FF helmet  with added Sena 10u blu-tooth phone/music etc. from my LG v10.  That also give me spoken turn by turn GPS with Google maps.

I love my current setup, & I would ride it anywhere with no worries about breakdowns.

~John

Thanks for that info, John. I tend to lean toward a little extra power. I also think that when ridden properly (no lugging, riding in its sweet spot), a higher performance motor will last as long as a lower one.

125/135 on avg for the LC engine

Quote from: GMR-PERFORMANCE on January 10, 2017, 06:31:34 AM
125/135 on avg for the LC engine

That is no slouch. How about the HC?

135-140 tq 136 ish . and this is based on installing and tuning hundreds of these. Some do better than others I had a HC engine in here that i just tuned that only made 130 HP and 138 TQ but the same build before that made 142/139 

S&S does not make power claims on these engines

I tend toward the HC just because I like my motor to sound a little angry.

Steve, what's the difference on the street between the two?