HarleyTechTalk

Quote from: Merc63 on January 09, 2012, 04:19:32 PM

Quote from: biggzed on January 09, 2012, 04:04:13 PM
How can you be chasing numbers and swapping parts when you don't even know what CR and cam is in it? How do you know the thing was ever put together right?

Zach

I assume it was built right, but you are right we don't know the internals as this engine was built over 7-8years ago and the guy who did it no longer works at the harley shop where it was assembled.

I can tell by the dyno sheet that its having a hard time breathing in the higher RPM. Torque shoots up fast but quickly starts to fall on its face.  Just by changing the exhaust to a boarzilla gave us over 10+ hp and flattened out the torque curve. Obviously the 45mm Mukuini is too small for this size engine.. Once the new carb is on and we see the result from that, we can either dig into it more (cam, heads) or leave it alone.


I see no other way to reach my goals other then experimenting? Do you have any ideas?

I think taking the cams out and looking for a part number would be a good start before too much experimenting happens. Use a bore scope to determine the general style of piston it has (flat top/domed/dished). I wouldn't assume to much. If someone put together an engine this size and felt a Mik45 was the right carb, maybe they also thought a .510 cam was the right cam. Stupid example, but just trying to illustrate you should dig into it and find out what the total build is before throwing money/parts at it to achieve a goal.

Zach
What I meant by my previous comment about it being put together right was more along the lines of if the cams/heads/compression were a good match.

  7 or 8 years old ? how many miles  ?    If  it was mine and it ain`t..        ..I would take it down see what the internals are  ,cc the heads etc ,hone  ,re-  ring  ?  Zach is right,   think your chase`n your tail  ,  untill you know what your working with...bladerunner

I have the carb already, so we will see where that takes us. It just might do the trick, if not, looking into the cams and heads is next.

After you get it running with the new carb, while it's warm do a cranking compression test.
This will tell about the condition of things and if you get the cam number you'll have an idea of what range of cams you can shop with out static compression changes

Your question what do they flow:
This is with a 1.610 ex and 2.08 intake and very minor port work.

[attachment removed after 60 days by system]

Quote from: Deweysheads on January 09, 2012, 06:14:43 PM
Your question what do they flow:
This is with a 1.610 ex and 2.08 intake and very minor port work.

Is this a reprinted document or Did you confirm these numbers on your flowbench?

My flow bench

  Nice

This EVO 124 went 147/147 SAE at 11.2/1 Mik 48 stock motor otherwise.

Those S&S TC heads seem to like that stock .605 exhaust. That may be just me though.

Quote from: Deweysheads on January 09, 2012, 06:28:43 PM
This EVO 124 went 147/147 SAE at 11.2/1 Mik 48 stock motor otherwise.

Awesome numbers, thanks for the document.

Quote from: 1FSTRK on January 09, 2012, 04:45:07 PM
After you get it running with the new carb, while it's warm do a cranking compression test.
This will tell about the condition of things and if you get the cam number you'll have an idea of what range of cams you can shop with out static compression changes

I am not sure if this was done warm or not, but I had asked my indy and he said it was in the 150psi range. Does this seem too low?  Bike runs good, 122hp,137tq... Doesn't smoke or anything. BTW, this was done with the Mik 45 on it.. Haven't got the G on yet because the manifold that S&S sent doesn't fit the 4.75" stroke. I have to send them my old manifold to get a custom one made up.

And the releases? Disconnected or not? Throttle open??

Quote from: Deweysheads on January 09, 2012, 07:23:51 PM
And the releases? Disconnected or not? Throttle open??

He said the releases were disconnected. However, I am not sure if they opened the throttle or not, I will ask!

Quote from: Merc63 on January 09, 2012, 07:21:44 PM

Quote from: 1FSTRK on January 09, 2012, 04:45:07 PM
After you get it running with the new carb, while it's warm do a cranking compression test.
This will tell about the condition of things and if you get the cam number you'll have an idea of what range of cams you can shop with out static compression changes

I am not sure if this was done warm or not, but I had asked my indy and he said it was in the 150psi range. Does this seem too low?  Bike runs good, 122hp,137tq... Doesn't smoke or anything. BTW, this was done with the Mik 45 on it.. Haven't got the G on yet because the manifold that S&S sent doesn't fit the 4.75" stroke. I have to send them my old manifold to get a custom one made up.

Your not going to see your goal hp with that cam/compression combo so my next move would be to identify the cam you have.

Quote from: 1FSTRK on January 09, 2012, 07:29:57 PM

Quote from: Merc63 on January 09, 2012, 07:21:44 PM

Quote from: 1FSTRK on January 09, 2012, 04:45:07 PM
After you get it running with the new carb, while it's warm do a cranking compression test.
This will tell about the condition of things and if you get the cam number you'll have an idea of what range of cams you can shop with out static compression changes

I am not sure if this was done warm or not, but I had asked my indy and he said it was in the 150psi range. Does this seem too low?  Bike runs good, 122hp,137tq... Doesn't smoke or anything. BTW, this was done with the Mik 45 on it.. Haven't got the G on yet because the manifold that S&S sent doesn't fit the 4.75" stroke. I have to send them my old manifold to get a custom one made up.

Your not going to see your goal hp with that cam/compression combo so my next move would be to identify the cam you have.

If the CCP was checked correctly, 

K.

Quote from: aharp on January 09, 2012, 06:42:52 PM
Those S&S TC heads seem to like that stock .605 exhaust. That may be just me though.

As long as the "camel hump" exhaust floor is semi-maintained.
If going to a larger exhaust, then that is when that is changed, here.
Scott

While you're waiting for the custom manifold to be built, why not pull the cams? Doesn't take long and it's a big missing component to realizing what needs to be done to achieve your goals.

Zach

Quote from: Merc63 on January 09, 2012, 07:21:44 PM

Quote from: 1FSTRK on January 09, 2012, 04:45:07 PM
After you get it running with the new carb, while it's warm do a cranking compression test.
This will tell about the condition of things and if you get the cam number you'll have an idea of what range of cams you can shop with out static compression changes

I am not sure if this was done warm or not, but I had asked my indy and he said it was in the 150psi range. Does this seem too low?  Bike runs good, 122hp,137tq... Doesn't smoke or anything. BTW, this was done with the Mik 45 on it.. Haven't got the G on yet because the manifold that S&S sent doesn't fit the 4.75" stroke. I have to send them my old manifold to get a custom one made up.

Me thinks the 124"er has a 4 1/8" hole x 4 5/8" arm.
If your running a 4 3/4" flywheel assembly that would be a 127" powerplant.
Scott

Quote from: Hillsidecyclecom on December 24, 2011, 11:16:42 AM

Quote from: 1FSTRK on December 24, 2011, 07:52:16 AM
I have seen the box stock crate 124 make 140-150 hp with an S&S man,S&S carb w/thunder jet, and good flowing stepped head pipes. If I remember correctly it made about 142 with the 48 Mik and wood large air filter. The heads should not hold you up.

Don't feed folk's that bull"Potty mouth" about 150 hp from a crate 124"ers.
THEY DON'T.

thank you

This was already addressed on page one. Try to stay up to speed

1.605 VS 1.610, they are nearly identical.

Quote from: biggzed on January 10, 2012, 08:54:20 AM
While you're waiting for the custom manifold to be built, why not pull the cams? Doesn't take long and it's a big missing component to realizing what needs to be done to achieve your goals.

Zach

Good idea, but I think Im just going to wait till the carb is on, see what happens then take it from there.. Who knows maybe that will bump the power up a bit and Ill be happy with that.

Quote from: Merc63 on January 10, 2012, 12:00:51 PM

Quote from: biggzed on January 10, 2012, 08:54:20 AM
While you're waiting for the custom manifold to be built, why not pull the cams? Doesn't take long and it's a big missing component to realizing what needs to be done to achieve your goals.

Zach

Good idea, but I think Im just going to wait till the carb is on, see what happens then take it from there.. Who knows maybe that will bump the power up a bit and Ill be happy with that.

Well, you've been led to water. Good luck. I hope that carb is the golden key for you.

Zach

Yep, it's a learning curve. I'll report back once the carb is on!