SE 203 vs. SE 204??? : V-Twin Forum: Harley Davidson Forums

CSM-H · 08-27-2009, 05:35 PM

Hey to all, looking for opinions on this comparrison for these two cams only. I have an 06 FLHT with a 95" BB kit, SE flat top pistons (.030 comtetic) and 203 cams,K&N airfilter (w/modified airbox) 103 mufflers and a FuelMoto PCIII.

So it's a basic question is the SE204 a better cam for this bike with this set up? I ride most of the time single, two up probably less than 10% of the time, looking for good low end, but better mid range and maybe a little on the top as I have the 6200rpm limiter.

I do intend to send the heads BigBoyz or ?, so the compression will be corrected at 9,2-9.5 all else will be the same......opinions please, thanks, CSM-H

arealinvestor · 08-27-2009, 05:54 PM

Quote:

Originally Posted by CSM-H

Hey to all, looking for opinions on this comparrison for these two cams only. I have an 06 FLHT with a 95" BB kit, SE flat top pistons (.030 comtetic) and 203 cams,K&N airfilter (w/modified airbox) 103 mufflers and a FuelMoto PCIII.

So it's a basic question is the SE204 a better cam for this bike with this set up? I ride most of the time single, two up probably less than 10% of the time, looking for good low end, but better mid range and maybe a little on the top as I have the 6200rpm limiter.

I do intend to send the heads BigBoyz or ?, so the compression will be corrected at 9,2-9.5 all else will be the same......opinions please, thanks, CSM-H

JMHOP, with what you stated, i would run the SE 203 with the 36 degree intake close.Especially if you going to get head work & be at 9.5 corrected.Any reason why your not considering any other cams??? Because there are better cams on the market!!!

strokerjlk · 08-27-2009, 08:09 PM

call and talk to bean at big boyz.
He will explain the diff in the two cams.
A lot more going on between these two cams than intake close.
look at the lobe separation and lobe centers.
the 204's will give you a broader power band and build more Cly pressure......in a nut shell.
Call Bean he is very knowledgable and will steer ya right!

OldMsocko · 08-27-2009, 09:02 PM

I had the SE 204 cams in my BB build on my 06 Ultra and loved them. Had Hillside do my heads and was running a Headquarters Pro Tuner. There is considerable difference between the 203 and 204 cams.

aka_matt · 08-27-2009, 11:28 PM

the 203 is a good cam, its more choppy than the 204, (has more overlap and narrower LSA)
with beans heads and 9.6 comp, a friend made 95/95 on his dyna with the same basic setup u have...

msocko3 · 08-28-2009, 05:36 AM

Quote:

Originally Posted by aka_matt

the 203 is a good cam, its more choppy than the 204, (has more overlap and narrower LSA)

Never noticed much chop in the idle on the 05 FLHTCI that I had a 95" with 203 cams, it had some but not as much as the 204 cams in my dads 06 FLHTCUI.

CSM-H · 08-28-2009, 07:17 PM

strkerjlk, hey thanks to you and all else that answered. I believe you have answered it for me...204's it is.....again, thanks

Quote:

Originally Posted by strokerjlk

call and talk to bean at big boyz.
He will explain the diff in the two cams.
A lot more going on between these two cams than intake close.
look at the lobe separation and lobe centers.
the 204's will give you a broader power band and build more Cly pressure......in a nut shell.
Call Bean he is very knowledgable and will steer ya right!

95FLHR · 08-28-2009, 07:37 PM

I have 204's in my Ultra. It is still an 88. Good low end torque and gets real happy at 2500 rpm and above.

strokerjlk · 08-28-2009, 09:18 PM

Quote:

Originally Posted by CSM-H

strkerjlk, hey thanks to you and all else that answered. I believe you have answered it for me...204's it is.....again, thanks

No problem
ya gonna get bean to do those heads?

CSM-H · 08-29-2009, 07:46 AM

strokerjlk, now we're into another subject.....I have been led to believe from reading here and other places that '06 heads flow pretty good and that although getting the heads done, it may not add much (2-3 hp/5tq) are numbers that I have read thrown around.

Comments are apprecited. CSM-H

Quote:

Originally Posted by strokerjlk

No problem
ya gonna get bean to do those heads?

strokerjlk · 08-29-2009, 09:40 AM

Quote:

Originally Posted by CSM-H

strokerjlk, now we're into another subject.....I have been led to believe from reading here and other places that '06 heads flow pretty good and that although getting the heads done, it may not add much (2-3 hp/5tq) are numbers that I have read thrown around.

Comments are apprecited. CSM-H

yes the 06 up flow very well.
as for porting heads...the numbers will vary with the other mods to the motor.
everything works togather.
using your number for reference only.
if the gains were 3 hp and 5 tq. while that dosent seem like a lot .
what if it carried that gain from off idle to 5500 rpm. you would feel a diff throughout your whole power band. throttle response would be much crisper also. The efficiency of the motor is going to go up so your will be making the same power at a lower throttle %. in a nutshell the porting will allow more air and fuel delivery through out a broader rpm range (velocity) vs the stock ports. while this may not be a huge number on paper it will feel and react on the street as huge!
As you go up in compression and cam lift, and timing this will increase also. so the numbers on paper will increase also. There is a point that it will run out based on efficiency.

CSM-H · 08-29-2009, 01:18 PM

strokerjlk, that fact I understood everything you said is scarey....Will be looking for heads now too. CSM-H

Quote:

Originally Posted by strokerjlk

yes the 06 up flow very well.
as for porting heads...the numbers will vary with the other mods to the motor.
everything works togather.
using your number for reference only.
if the gains were 3 hp and 5 tq. while that dosent seem like a lot .
what if it carried that gain from off idle to 5500 rpm. you would feel a diff throughout your whole power band. throttle response would be much crisper also. The efficiency of the motor is going to go up so your will be making the same power at a lower throttle %. in a nutshell the porting will allow more air and fuel delivery through out a broader rpm range (velocity) vs the stock ports. while this may not be a huge number on paper it will feel and react on the street as huge!
As you go up in compression and cam lift, and timing this will increase also. so the numbers on paper will increase also. There is a point that it will run out based on efficiency.

ChromeWelder · 08-29-2009, 09:50 PM

It sounds like the decison has been made...but the 204's ROCK.

strokerjlk · 08-30-2009, 09:01 PM

Quote:

Originally Posted by CSM-H

strokerjlk, that fact I understood everything you said is scarey....Will be looking for heads now too. CSM-H

Give bean a call at Big boyz.

machinist · 08-30-2009, 10:32 PM

I am running a similar build to Strokers with Bean's heads, an LSR, and a mastertune TTS. What he says about the numbers and where you have them is on the money. I cant speak to a 203 since I never ran one. I went from stock to 204's. I wasnt looking for drag bike just a stronger cruiser and its a real blast having more torque at 2000 rpm then I had at 5000 rpm when it was stock.