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Author Topic: SE-253 cam specs  (Read 9084 times)

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SHRADER

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SE-253 cam specs
« on: April 24, 2005, 09:58:25 PM »

Many times on this site I have seen reference to the mystery cam specs of the SE-253 cam that comes stock in 103's.

Here are the specs for the cam as posted in little known  2003 technical forum that has long since been deleted from H-D's dealer only site.

Intake    .530 lift      237 duration  open 9 BTDC close 51 ABDC
Exhaust  .530 lift     252 duration  open 62 BBDC close 17 ATDC

Just for everyones info.
REGARDS
SHRADER
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Defender

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Re: SE-253 cam specs
« Reply #1 on: April 24, 2005, 11:53:48 PM »

Thanks for the info.... [smiley=biggthumpup.gif]
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ReynoldsS

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Re: SE-253 cam specs
« Reply #2 on: April 27, 2005, 06:32:44 PM »

I had my local shop call today and they said 237/239 on the duration, Now its got me wondering. [smiley=confused5.gif]
« Last Edit: April 27, 2005, 06:35:28 PM by ReynoldsS »
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Fatboy

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Re: SE-253 cam specs
« Reply #3 on: April 27, 2005, 06:38:26 PM »

OK......I'll admit I'm a novice on cams so here's my question for the wrenches out there.

What is the ideal cam for a 103 to be riden mostly in the 2000 - 4500 rpm range? And are gear driven cams really better? [smiley=nixweiss.gif]
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Re: SE-253 cam specs
« Reply #4 on: April 27, 2005, 07:55:23 PM »

Hey Scrader, My Bad. Your post is correct on the duration. And Fatbot I think this cam would work very good in that rpm range, and I would say gear driven cams are better. alittle freeer turning and no shoes to wear out. But for now i'll just check mine ever 20,000 [smiley=xyxthumbs.gif]
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kng103

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Re: SE-253 cam specs
« Reply #5 on: April 27, 2005, 08:33:31 PM »

Quote
OK......I'll admit I'm a novice on cams so here's my question for the wrenches out there.

What is the ideal cam for a 103 to be riden mostly in the 2000 - 4500 rpm range? And are gear driven cams really better? [smiley=nixweiss.gif]


this has been discussed and argued here before.
my oppinion is that the cams are the one biggest change you can make with the best results for the least amount of money. assuming you already did the stage1 and pipes.
« Last Edit: April 28, 2005, 10:31:29 AM by kng103 »
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Fatboy

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Re: SE-253 cam specs
« Reply #6 on: April 27, 2005, 08:43:46 PM »

KNG103,

Here's what I think I'm going to do once the bike "gets here" next week: Hooker True Duals, Zippers 50mm throttle body, high flow air cleaner kit and their new Thundermax ECM. The cams may be an option I would consider if I better understood the cost/benefit/results for my application.

I'd like to stay under $2500 in parts to make this bike run better. I don't beat up my toys but I do want it to move out when I punch it up a little when out with the boys.........

Thank you for your input and advice.
« Last Edit: April 27, 2005, 08:48:33 PM by fatboy »
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DCFIREMANN

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Re: SE-253 cam specs
« Reply #7 on: April 28, 2005, 07:26:25 AM »

Fatboy I sent you a PM.

Shrader thanks for the info on our STOCK CAMS!

After doing the basic mods the next thing I would do is remove the stock Harley cams and chains. The cam has a decent profile  for a stock 103 but the chains must go. This has been a problem the motor company refuses to address. I have seen to much wear and damage because of the tensioners not to mention the slack in the chains and cam timing problems at warp speed.

I am going to make some changes when I return from Myrtle as I have stated in the past.

Harley makes some good high performance items that I am going to use but when you want to make good numbers the aftermarket is all over them. I have a set of Bob Wood cams with gear drive. The heads will be Zippers, the pistons right now are going to be harley. The throttle body and ECM are also going to be zippers. I am going to keep this bike looking as stock as posible and at 103.

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kng103

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Re: SE-253 cam specs
« Reply #8 on: April 28, 2005, 08:09:34 AM »

Quote
KNG103,

 Here's what I think I'm going to do once the bike "gets here" next week: Hooker True Duals, Zippers 50mm throttle body, high flow air cleaner kit and their new Thundermax ECM. The cams may be an option I would consider if I better understood the cost/benefit/results for my application.

 I'd like to stay under $2500 in parts to make this bike run better. I don't beat up my toys but I do want it to move out when I punch it up a little when out with the boys.........

 Thank you for your input and advice.


if you are going to change over to a 50mm throtle body.
you should definitley do some head work, intake work, and change out the cams.
now your talking some serious loot.
like old hubbard say's " speed cost money"
if you are doing head and cam work, the stock throttle body is fine.
« Last Edit: April 28, 2005, 10:32:31 AM by kng103 »
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2004 flhrci se-103 pearl white
bassani true duals w/ho mufflers
se air cleaner
sert
se-251 cam
s&s reed valve
24/37 gearing
se-6 sp
rumble road speakers
2008 lincoln mark lt(silver)

mr_magoo

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Re: SE-253 cam specs
« Reply #9 on: April 28, 2005, 08:25:49 AM »

The sign in the old shop read SPEED COSTS HOW FAST CAN YOU AFFORD TO GO?
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Fatboy

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Re: SE-253 cam specs
« Reply #10 on: April 28, 2005, 09:03:01 AM »

Bottomline is: Opee will look best chasing my taillight!

He will be setting the local benchmark when he gets his bike back and then gets it dyno tuned later on.
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hd2003-se2005

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Re: SE-253 cam specs
« Reply #11 on: April 28, 2005, 09:33:45 AM »

Quote

if you are going to change over to a 50mm throtle body.
you should definitley do some head work, intake work, and change out the cams.
now your talking some seriuos loot.
like old hubbard say's " speed cost money"
if you are doing head and cam work, the stock throttle body is fine.



Kng is right in his post above.
If you did the Freedom package at $1,400 that would leave $1,100 for cams and tuning and stay in your budget.
I believe that would be a great combination.
[smiley=xyxthumbs.gif]

Hey Kng
What's this about Hubbard being "OLD" [smiley=nixweiss.gif]
« Last Edit: April 28, 2005, 09:34:41 AM by hd2003-se2005 »
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DCFIREMANN

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Re: SE-253 cam specs
« Reply #12 on: April 28, 2005, 09:35:37 AM »

Magoo you said it best. Thats exactally what the sign reads in the speed shops around here.

King I have to disagree with you on the 50mm throttle body. I personally think the 103 is starved for air. If I do (and I am) head work compression change and a radical cam I am going with Zippers 54mm throttle body. They have done a lot of testing with the stock 103 and the 50mm and thier ECM. I have it but I also put in a 6 speed at the same time and I have to go back into the clutch and find out why it won't release. So I have not road tested the unit as of yet. The guys on the York tour will get to see it first hand if I get it ironed out by sunday. The bike ran  good with a thunder header,screamin eagle air cleaner and power commander so I have a base line for comparrsion.

The more air and fuel you can cram into these motors the more power you will make(volumeritic efficency). If the 45mm throttle body is ok why does the motor company use it on the 88 as well? Just a thought. With the mods you have done to your bike I think you would benefit from a larger throttle body as well. Stay safe

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kng103

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Re: SE-253 cam specs
« Reply #13 on: April 28, 2005, 10:19:04 AM »

Quote
Magoo you said it best. Thats exactally what the sign reads in the speed shops around here.

King I have to disagree with you on the 50mm throttle body. I personally think the 103 is starved for air. If I do (and I am) head work compression change and a radical cam I am going with Zippers 54mm throttle body. They have done a lot of testing with the stock 103 and the 50mm and thier ECM. I have it but I also put in a 6 speed at the same time and I have to go back into the clutch and find out why it won't release. So I have not road tested the unit as of yet. The guys on the York tour will get to see it first hand if I get it ironed out by sunday. The bike ran
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2004 flhrci se-103 pearl white
bassani true duals w/ho mufflers
se air cleaner
sert
se-251 cam
s&s reed valve
24/37 gearing
se-6 sp
rumble road speakers
2008 lincoln mark lt(silver)

the O`Fender

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Re: SE-253 cam specs
« Reply #14 on: April 28, 2005, 12:51:03 PM »

What are you looking for more torque or more HP? obviously we all want more of both but the answer to that question dictates what to do with the heads and what cam to use and weather or not to enlarge the throttle body. The hot rod guys I have been discussing this with (many) the majority feel the 45mm TB will flow more than enough air for 125+HP however the injectors are questionable. The reason I am posting this is I believe that the Zippers TB reuses your stock injectors. A questionable solution to the issue of HP.  
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