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CVO Technical => Twin Cam => Topic started by: SERK103 on February 27, 2004, 05:57:33 AM

Title: 251 CAM
Post by: SERK103 on February 27, 2004, 05:57:33 AM
I'll be going with this in the near future, the 251.  From what i've heard the high-lift(.579) 251 cam doe not require any spring, valve modifications.  it's a low to mid cam, just where i'd like it.  any knowledge of this cam appreciated. [smiley=huepfenjump3.gif]
Title: Re: 251 CAM
Post by: JCZ on February 27, 2004, 09:18:18 AM
Serk I might suggest that you look at the Woods TW5G cams.  They were designed specifically for the HD 103" using stock heads.  It will out pull all the HD cams.  It's also a gear drive cam so you'll have more reliability in that area, as well.  This is the set up that I'll be going with, eventually.

You can call GMR Perfprmance at (810) 650-6403 for information from somebody who has already installed more than a few of these.  He's very easy to talk to and explains things where you can understand him.  You can buy your parts from him cheaper than just about anywhere else, too.

Take a look at this thread in the SEEG forum (you might want to check the SEEG forum out every now and then, as we have the same motor)  http://flhrsei.org/cgi-bin/yabb/YaBB.cgi?board=eg_gen;action=display;num=1072508181;start=0#0
Title: Re: 251 CAM
Post by: Black_Dog on February 27, 2004, 10:05:20 AM
Be aware that gear drive cams can have a very irritating whine, the hotter the engine gets the tighter the gears mech and the louder whine.

Black Dog
Title: Re: 251 CAM
Post by: JCZ on February 27, 2004, 10:38:12 AM
Quote
Be aware that gear drive cams can have a very irritating whine, the hotter the engine gets the tighter the gears mech and the louder whine.

Black Dog


Now that's an interesting way of looking at it, that I had never thought of, before.  I never thought of it being irritating.  I've always related the gear drive whine with performance, wether it was in the hot rods and roadsters or in the bikes, so I've always liked the sound.  Kind of sounds like the supercharger whine, from the blower on my truck.  Whatever we think of the sound (and it's really negligable from my perspective) it certainly adds reliablitity to the valve train.

Thank you Black Dog for another perspective thow, that I had never considered.
Title: Re: 251 CAM
Post by: Michael on February 27, 2004, 03:50:35 PM
Question...the 251 cam is a .579 lift. Arent the performance heads on the SERK good for a maximum cam lift of .575?

I am a supporter of the new 251 cam, just put it in a friends 95CI Fat Boy. The cam works very well, better than the 211 cam I had in my 95CI motor before I bought my SERK.

Back to my question, won't the valvesprings need to be replaced to use the 251 cam? Will anything else need to be changed?
Title: Re: 251 CAM
Post by: SERK103 on February 27, 2004, 03:58:11 PM
JC,  I saw your posts about the Woods cam.  I did not want to go gear because of the cost.  Harley has greatly improved their tensioner, so reliabily has improved.  The cost of the 251 is $269.  Also, adjustable pushrods, $139.  Were as the Woods cam, $360 then the conversion kit, 300, labor....Im' not being negitive about the gear set-up, because it is great, i just see some cost savings with chain.  
Title: Re: 251 CAM
Post by: rturn2mow on March 13, 2004, 10:26:53 AM
From  what I  have read you would be de-tuning your bike. Maybe I am wrong but according to the parts catalogs the the SE 103 engines come with 253 cams ( a part specific to SE Bikes). If this is accurate, I cannot forsee a difference that would make it worth even doing. Maybe I am wrong. I ws going by the Parts catalog. Page 446 part number 29842-03. It states you can bring you Twin cam up to the same diplacement and performance as the SE Road King using the same proven components. And it states the 253. Again, maybe I am missing something. Just my 2 cents.
Title: Re: 251 CAM
Post by: radian on May 25, 2004, 05:28:51 PM
I currently am running a 203 cam with my 95 inch motor and flat top pistons.  Getting ready to change things up and also interested in feedback on the new251 cam vs. the 257 cam.  What are the differences?  I'll be sending my heads to be re worked by Baisley and will have them ready to accomodate higher performance cam such as the 251 or 257.  Any feedback will be helpful.
Title: Re: 251 CAM
Post by: kng103 on May 26, 2004, 10:01:50 AM
got this info from hd.
the max lift for the valve spring is 569.
if you are going to change cams, it might be wise to port and polish the heads.