Which cam?

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#31

11-02-2009 | 06:50 PM

capman98

Cruiser

Joined: Aug 2008

Posts: 115

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From: MT. airey MD

well with all this talk about the different cams going on I just had to ask this. IF I do a 110 kit with some head work and a projected compresion ratio of 10.25:1, will the 255 work or do i need to look at somthing different. the 255 come with the kit but that is only 9.5:1???? by the way it's going in a heavy *** bagger that I usually ride 2-up.

Last edited by capman98; 11-02-2009 at 06:52 PM. Reason: more info

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#32

11-02-2009 | 06:58 PM

Faast Ed

Banned

Joined: Sep 2009

Posts: 7,580

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From: The Internet (& Dyer, Indiana)

Quote:

Originally Posted by emwolb

take a look at any dyno chart. you'll see that the hp and torque cross at 5250 rpm. my thoughts are that a comfortable cam that places emphasis on fat low through midrange cam profiles would be a good choice. sure, you can get more horsepower etc, with higher lifts, longer durations, but are likely to sacrifice real world usable power. looks like the 255's and 54's both achieve that. there are surely others, and "big boyz" heads has a great chart describing cam grinds. there is some valuable information there too.

Good post, but it also illustrates a point that somebody else brought up. Riders habits. If the rider likes to blast the rev limiter once in a while, he will likely be dissapointed in the 255. If the rider has no interest in high rpm "playtime", then either of the two that you mentioned will satisfy him.

This is important to think about, considering the effort involved in building the motor. Get ready to "play" and find dissapointment? NOT an option.

Last edited by Faast Ed; 11-02-2009 at 07:03 PM.

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#33

11-02-2009 | 07:02 PM

jag1886

Elite HDF Member

Joined: Sep 2007

Posts: 4,085

Likes: 11

From: Boise Idaho

You are leaving out the HQ500 cam, I put one in last winter and it flat turned my bike into a running machine, 90HP and 93LBS of torque, best investment I have made in my bike so far and I've invested a lot!!!!!!!!!

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#34

11-02-2009 | 08:00 PM

thewholehog

Road Master

Joined: Nov 2009

Posts: 856

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Quote:

Originally Posted by jag1886

With an intake close of 36* (I think) the HQ500 cam might not give the best low end TQ - which incidently is what the OP is asking for since it is a 2-up touring bike.

Do you have a dyno chart you could post?

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#35

11-02-2009 | 08:08 PM

thewholehog

Road Master

Joined: Nov 2009

Posts: 856

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Quote:

Originally Posted by iclick

I considered this setup 'til I read this thread and started corresponding with the OP. I ended up buying the OP's used 255's based on his comments and those I had gleaned in the past two years reading forums and talking to tech support from various cam mfrs. In that period I did talk to Bob Wood more than once and he was very helpful but didn't try to sell me on something inappropriate for my needs. Rather than spend $525 for the 6-6's w/+4° gear I spent $110 instead on the 255's, as my interest is in performance below 4k RPM. I considered the dyno charts posted by the OP of that thread as nearly worthless since the tuner didn't start the pull 'til 3k RPM, and 2-3k RPM is a region that's very important to me. "

Iclick, I agree that the 255 is a decent cam for low end TQ on a heavy touring bike etc..... but despite what the Andrews tech guy said, the 21 and the 26 will work very well in a touring bike - I have seen many dyno charts that have demonstrated a lovely TQ curve from 2000rpm right to 5000+rpm.

I have a question for you, did you consider the Crane cams in your quest for the right cam? The HTC-300-2 grind has nice specs for a touring bike - 33* intake close, 226 duration, 27* overlap, .505 lift. I would like to hear your thoughts on this.

Last edited by thewholehog; 11-03-2009 at 01:08 AM.

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#36

11-02-2009 | 09:15 PM

Kustomhd

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Joined: Oct 2009

Posts: 57

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se255 is my preference you will be happy with them... I have installed dozens of them on customers bikes and all are happy.

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#37

11-03-2009 | 01:06 AM

VibratingPotato

Tourer

Joined: May 2009

Posts: 304

Likes: 1

From: Ohio

I'm in the same boat
I've narrowed my choice to the 21 or 255 also.
I might go to 103" maybe.
Seems a lot of people have the 255's and like them.
I would really like to see a dyno sheet and a write up on the 21's.
So, my vote goes to the Andrews 21's.
I think they would give a decent boost in torque,
and make a great all-around cam.

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