I am having my bike upgraded to the 103" and was originally going with the SE 255 cams. When talking to the dealer the other day he mentioned going with the 254e cams. I am a novice when it comes to engine mods. Where and what kind of power am I looking at between these two cams? The HD site says that two equal bikes running these cams the 254e would pull away from the 255 in the 0-60, 1/8, and 1/4 mile.

I want the power mainly low and mid but dont want a huge drop off. I'm not racing anyone or looking for a monster build. I want reliability and a good seat of the pants pull and be able to accellerate when passing easily. I normally keep my rpm down below 4k-4.5k.

Heres the specs on the cams but, like I said, I dont know what the numbers mean to me in street riding. FWIW, I know woods and others make great cams. I'm getting a good discount sticking with my dealer for this stuff and they will warranty their work for me. Other mods are a big sucker intake, the 103" kit, V&H side shots, and I'll be using the TTS mastertune. Main question is what is the difference in these two cams in terms of power and range. Thanks.

Fits ’06-later Dyna and ’07-later Softail and Touring models.
Lift @ Valve – Intake/Exhaust .535"/.536"
Duration @.053 Intake/Exhaust 224 ̊/234 ̊
Timing @.053 Lift - open/close Intake: 1 ̊ BTDC/43 ̊ ABDC
Timing @.053 Lift - open/close Exhaust: 50 ̊ BBDC/4 ̊ ATDC
TDCLift@Valve–Intake/Exhaust 0.094"/.102"


compared to the 255
25638-07
Lift @ Valve – Intake/Exhaust .550"/.550" also 556/556
Duration @.053 Intake/Exhaust 211 ̊/235 ̊
Timing @.053 Lift - open/close Intake: 6 ̊ BTDC/48 ̊ ABDC
Timing @.053 Lift - open/close Exhaust: 48 ̊ BBDC/7 ̊ ATDC
TDCLift@Valve–Intake/Exhaust 0.079"/.070" also 0.130"/.116"

 

Check out the woods tw-6 or the tw-555. Great reviews.

 

I know they get great reviews and appreciate the advice. For a few reasons though I am sticking with the SE cams so am just looking for info on how these two compare.

 

If to choose between the two I'd go with the 254E, it will not fall off as quick as the 255's

 

Your numbers are off on the specs for the SE255.It has a 25 intake close.It's going to sign off very early.If your numbers are right for 254E cam(43 intake close), then that's to much cam for a stock motor;your dealer is wrong.If you want a low to mid without a serious drop off, & you want to stick with SE stuff,then go with the SE 204's(it has a 34 intake close)!!

 

I'll be going with the SE 254E this winter. I found the following link online that shows a nicely shaped torque curve and it should be easy to tune without worrying about too much compression and pinging. I don't want max power, but something that improves stock and easy to work with. The SEPST has a canned map to start with which is a plus:

http://harleytechtalk.org/htt/index....c,32584.0.html

Mark

 

A .030 head gasket would take care of the 43*IVC.

 

It would help to a certain extent by raising the compression.Comp could still be off though, because of the stock heads not being cc'd from the factory.It's a gamble.If it were my bike, & i'm running a later close(40 + intake)I would have heads cleaned up & cc'd to get the comp right!!! I'm just saying.

 

I think the 254E is one of the new MoCo cam profiles, so there isn't a lot of data available. The dyno chart Mark posted looks pretty good. Rough calcs indicate that if you change head gaskets to .030" Cometic and your chambers are 85cc, your static compression will be about 10:1, corrected compression about 9.2 and cranking compression about 190psi. Looks like a decent cam and it definitely will not fade as fast as the 255.

Also note the exhaust on the dyno bike was Vance and Hines Power Dual headers, Supertrapp Fat Shots, so if you want to replicate the results, you will need to change exhaust.

Forget the Big Sucker intake; the SE unit is sufficient with a Zippers MoFlo or K&N filter.

If you have the bucks; send the heads to BigBoyz for their "street" port and balancing of chamber volume to 85cc-86cc and manual compression releases. Some head work will bring the HP number up a bit and should extend the TQ curve a few hundred RPM.

It looks like a good cam choice to me but I would do the headwork, change exhaust and find a good tuner.

 

Don't know guys but i'm partial to the se251 cams. Good power thru out. 106hp / 122tq on a 103 build. Will be going for more compression and 58mm throttle body and bigger valves this winter and see if i can't pick up the numbers alittle.