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[OILCAN1]

I have a 2007 ultra classic w a 110 conversion,251 cams 10.5 pistons runs at 100hp and 110ft/lb.
I'm looking at trading it in on a new ultra limited. What is the deal with the factory 103's? how much compression and so on. Can you get respectable power with just cams or do you need pistons heads ect.
I'm not looking for huge numbers just a decent running bike. If anybody can give me some ideas it would be greatly appreciated!

[grc]

Nothing special about the 103 in the Limited that I can see, just a big bore kit with flat top pistons, stock TC96 heads, similar to the old 95" kit for the 88" engines. 

Engine:   Air-cooled, Twin Cam 103™   
Displacement:  103 cu. in.              1690 cc 
Bore x Stroke:  3.875 in. / 4.38       98.425 mm / 111.252 
Engine Torque:  J1349    102 ft. lbs. @ 3500 rpm       128.2916 Nm @ 3500 rpm 
Fuel System:   Electronic Sequential Port Fuel Injection (ESPFI)   
Compression Ratio:  9.7:1 
Primary Drive:  Chain, 34/46 ratio   
Gear Ratio (overall):
1st  9.593   
2nd  6.65 
3rd  4.938   
4th  4.0 
5th  3.407   
6th  2.875 
Fuel Economy:  City  35 mpg      6.72 l/100km 
Fuel Economy:  Hwy  54 mpg      4.3556 l/100km   


Jerry

[HOGMIKE]

I have a 2007 ultra classic w a 110 conversion,251 cams 10.5 pistons runs at 100hp and 110ft/lb.
I'm looking at trading it in on a new ultra limited. What is the deal with the factory 103's? how much compression and so on. Can you get respectable power with just cams or do you need pistons heads ect.
I'm not looking for huge numbers just a decent running bike. If anybody can give me some ideas it would be greatly appreciated!

It won't have the power that your '07 has, but, with about $700 worth of parts, you will have "decent power".....just not "awesome power"!
You will need decent air cleaner, maybe mufflers, tuner for sure.
JMHO

[Unbalanced]

I have a 2007 ultra classic w a 110 conversion,251 cams 10.5 pistons runs at 100hp and 110ft/lb.
I'm looking at trading it in on a new ultra limited. What is the deal with the factory 103's? how much compression and so on. Can you get respectable power with just cams or do you need pistons heads ect.
I'm not looking for huge numbers just a decent running bike. If anybody can give me some ideas it would be greatly appreciated!

Oilcan,
The question is what are you willing to give up or feel is the trade off you can live with.

A friend of mine just upgraded his 96" motor to a 103, its an 09 FLHX.  He sent the heads to Sachs, used a 570 S&S cam, HD tapered adjustables and 10.5 to flat tops and sent the throttlebody to HPI to have the Fly By Wire (FBW) opened up to a 54mm as well as the HD heavy breather and the Vance Hines stepped 2 into 1 pipe with a Power Commander V.   He is making a 117 tq and a 112 hp.   He didnt spend a ton and is thrilled with the results.  

Another proven build for the 103's were the zippers 575's which a lot of people have used and that as a bolt it and a good tune / open air breather and pipes should get you somewhat close to what you had in the 110 with quite a bit more down low.  Although I am not sure what stock springs will handle in your 103 limited that might be a stumbling point as the older CVO's heads had spring clearances up to 630 lift.   Might check with Fired00d and a few others that have this combo although again the springs might be an issue.
If memory serves me right these ended up around 108 tq and 100 hp.  I am sure someone will correct me or say what they had for ya.  

Some others are getting some really nice numbers from the Cycle Rama 575 cams.  As a bolt in on the 110s Herko just built and tuned one i believe it was 122 tq / 102 hp  no headwork.   Might be something to consider also.

[Fired00d]

Oilcan,
The question is what are you willing to give up or feel is the trade off you can live with.

A friend of mine just upgraded his 96" motor to a 103, its an 09 FLHX.  He sent the heads to Sachs, used a 570 S&S cam, HD tapered adjustables and 10.5 to flat tops and sent the throttlebody to HPI to have the Fly By Wire (FBW) opened up to a 54mm as well as the HD heavy breather and the Vance Hines stepped 2 into 1 pipe with a Power Commander V.   He is making a 117 tq and a 112 hp.   He didnt spend a ton and is thrilled with the results.  

Another proven build for the 103's were the zippers 575's which a lot of people have used and that as a bolt it and a good tune / open air breather and pipes should get you somewhat close to what you had in the 110 with quite a bit more down low.  Although I am not sure what stock springs will handle in your 103 limited that might be a stumbling point as the older CVO's heads had spring clearances up to 630 lift.   Might check with Fired00d and a few others that have this combo although again the springs might be an issue.
If memory serves me right these ended up around 108 tq and 100 hp.  I am sure someone will correct me or say what they had for ya.  

Some others are getting some really nice numbers from the Cycle Rama 575 cams.  As a bolt in on the 110s Herko just built and tuned one i believe it was 122 tq / 102 hp  no headwork.   Might be something to consider also.

Very happy with that setup (a list of my mods are in my signature) which dyno'd at 98 +/- HP and 108 +/- TQ. These cams were designed specifically to trick the stock heads that came in the CVO 103ci motors so not sure if the heads are the same in the limited.

 
Ride Safe,
Fired00d
 

[OILCAN1]

Thanks for all the grat advice I will look into the heads to see if they are the same as on the se103 motors. The zippers 575's look like a good choice. Currently I'm on somewhat of a tight budget so I'm hoping just pipes,ac,tuner and cams will fill the bill.

[HD Street Performance]

The ultra limited has a stock 96" head fitted with ACR compression releases. These are not close to the CVO 103 which has the ports and valves of the SE MCR heads and a wide open chamber VS bathtub.

[OILCAN1]

So what would be a good bolt in cam choice in your opinion?

[HD Street Performance]

There are many would depend on what the goal was.
For added grunt and torque that hits high and soon I would use a Woods TW5-6. It's a heavy bike and most of the guys I talk to are not looking to break the numbers records. Most just want the 6th gear to become useable without a drop in gears every little hill at 65mph or so. That is easy to get, a good tune and pipe are a must.

[OILCAN1]

Dewey,
are these engines super pipe sensitive like the 110's? I've always run 2into2 for looks but I think on a new bike I am going to try 2 into 1 they are starting to grow on me and I know the performance gains are better.

[HOGMIKE]

Dewey,
are these engines super pipe sensitive like the 110's? I've always run 2into2 for looks but I think on a new bike I am going to try 2 into 1 they are starting to grow on me and I know the performance gains are better.

FYI:
The engines on the 103 Limited are just standard 96" engines with larger bore. Other than ACR's, there is no difference. They are NOT like the older 103 SE engines.
You can expect about 10/10 (conservative) increase in HP/TQ with a muffler change, air cleaner change and a decent tune from what I saw on my Limited.
You will be fine on whatever exhaust you decide, probably not a 2HP change with the most common systems out there.

JMHO, of course!

[HD Street Performance]

The sensitivity to a good pipe doesn't really happen until you change to a cam with more than stock overlap. BTW take a look at the overlap numbers on that SE251 mentioned and compare it to similar duration cams just for a point of reference.
If stage 1 (stock cams) is the end of the line no concern.
True duals on the bagger will cull some low end torque
The stock headpipe (assuming 2 into1 into 2)is fine with cat removed, if equipped
A pipe like a Fatcat will get you more torque, the mass number not so much peaks, just more especially down low. Faster to rev, less gear changes.

[Unbalanced]

If you go with the D&D Fatcat you will also have the "Dip" in the torque curve that can be mostly tuned out that no one seems to mention in the recommendations.

[Twolanerider]

If you go with the D&D Fatcat you will also have the "Dip" in the torque curve that can be mostly tuned out that no one seems to mention in the recommendations.

No dip in the torque curve with Fatcats on either of mine.  Never was.  If it can be tuned out it's not a hardware mandate but a tuning issue anyway.

[SBB]

No dip in the torque curve with Fatcats on either of mine.  Never was.  If it can be tuned out it's not a hardware mandate but a tuning issue anyway.

+ 1

SBB