Hi all,

I’m building a 117” from my current 97” build. I want some advice regarding my cam choice. The Build will be 4.125” cylinders, -10cc S&S pistons, with S&S 4.375” flywheels. 89cc S&S heads, 0.030” HG. Bassani 2into1 road rage. And a 50mm Dan Vance modified TB with 4.9 injectors.
With the current dims, should give me 10.1 static comp.
I really like the specs of Andrews 57,54 & the Woods 6H but I’m really stumped on which way to go?
It should be noted that I have 3.37 gearing and a Baker06OD.
I want a nice smooth, rideable bottom end with the option for opening up.
Most of my riding is back roads, so want passing power, top speed is not my priority.
any advice is much appreciated.

 

If you gave me that plan, I would suggest having the OEM heads ported by any one of several well known head porters, equalize the chambers at 86cc, flat top pistons with a -1.5 to -2.5 dome volume, a 55/58 HPI throttle body with 5.3 injectors, and a cam like the CR 595 or 630i or the S&S 585 or something similar. Heads ported by any one of the porter/builders frequently reference on this forum will perform better than the "out of the box" S&S heads IMHO. Don't see the need to get "tricky" with dished pistons and would target 200psi CCP. Cylinder source is not mentioned so I assume S&S like the other S&S stuff? I would make sure that the cylinders and pistons are mocked up in torque plates and measured for fitment.JMHO but maybe that plan is not "mild" enough

I also think you would get better replies if your plan was posted in the Engine Mechanical section of the Tech/Mech section of the forum.

 

At 10:1 static run the CR575. Torque monster 135+

 

I already have the S&S 585 cams in my 97” so if went that route would definitely save some $$$ on cams in order to get the bigger TB.
The jugs and pistons were part of a S&S 117”LC piston and cylinder kit but could opt for the flat top’ kit to bump that compression to 10.5 and run my 585 cams.
My thoughts on keeping it low comp were for better street manners…

I did look at the CycleRama cams but from what I see they are for 07 upwards and my Dyna is an 05 with the upgraded hyd cam plate and oil pump so my cam choice is limited to early style cams…

 

Then your even more limited, you need to use "conversion cams".

Or you can use any 07 up set of cams by sending them to Randy Torgeson at Hyperformance and he'll machine the inner bearing surface of the cams and press on a new bearing race on the cams. They essentially make you a set of conversion cams.

 

Understood. I am running a 98" motor in my '05 FXSTD at 11.25 static with CCP at 213psi; very well behaved on the street. It's all in the tune.

 

I’m running the old style silent chains not the new style roller chains with hydraulic camplate setup, I should’ve said earlier, so the conversion cams are not applicable for my build. Thanks.

 

Understood.

 

While I'm not a fan of the SnS585 in a smaller motor unless you squeeze it real hard, I'd think that it would work real well in a 10.5 to 1 117. You can get closed that compression with stock heads and -10cc pistons.. I would not buy the SnS heads but a 06 up TC heads and have them ported by WFO Larry, Ward perf (?), Megaflow, or Don Dorfman.

The 585 tends to over exhaust in smaller motors.

With the money saved invest in a bigger carb / throttle body.

 

Keeping low compression for street manners is horse hockey and old thinking. Get it tuned and no issues with street manners.
I would shave the heads and use flat top pistons whenever possible to get the targeted compression. 10.5:1 and under for sure. Target ccp of 200psi minimum.
The 585s are ok but nothing to get excited over. The Tman 590 will do better low end torque under 3000rpm and still do as well up top if not better and is very effective in a 117 across the rpm range. The CR 595 would be an excellent choice as well. Both would do well at 10.5:1 but 10.8 would be better.
Anything over .600 lift would mean roller rockers. Then the Tman 662-2 or CR 630i @ 10.8 minimum to11.1 recommended would both be great choices.
The HPI 55/58 Max Flow is what I'd be running for a TB here. 4.9 injectors would work but I'd do the 5.3s.
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