As per usual it's winter and I'm stuck at work for 6 months and over thinking my spring engine mods.
The bike is a light and nimble FXSE with a 117" "stage 4" kit inclusive of the 110 heads, 259E, 58mm throttle, bigger injectors blah blah blah.

I want to get my heads done which includes 2.12 intake and wiz bang porting yada yada yada.

My compression is currently the stock 9.9-1
I can go 10.7-1 with the head work easy enough.
This was my plan until a few days ago.

I keep coming across these 11.5-1 compression 10cc dome pistons for my engine and then a set of new 263E cams popped up that I immediately dismissed until I started digging into them and it looks snotty.

So... is the 263E cam and 11.5-1 compression a winning combo or should I stay with 10.7-1 and the 259E cam.

I do everything with this bike. Quick runs to the gym or 10 hr long day rides. I barely ride 2 up and when I do she weighs 120 lbs including her 6" heels and shiny pants

When I tour it's basically a backpack strapped to a sissybar.

I ride all over my rpm range but find myself usually at 3000rpm no matter what I'm doing. I like to run it up to red line and giggle all the way with the current 9.9-1 259E configuration.

Hope that's enough information for informed responses!

 

JMHO but many better aftermarket cam selections once you get out of the SE menu.

 

Haha ok...

Pretend I said S&S625 or Fueling 594 then... basically the same cam.

Anyways how about those compression numbers

 

With compression that high, I'd be seriously concerned about fuel quality and knock. 11.5:1 in a twinkie will be a challenge to manage, I think.

 

I really don't think this guy knows what he's doing. I suggest you call a shop.... most will provide the answer your looking for...

 

I run a 116 ci Dyna (carbed 2000 FXDX) with a cr of 11.3 to 1 and a 625 SnS cam. Really don't have any issues with pinging and it seems to run just fine (about 16000 on this build). I don't have any problem putting some miles on it but would not want to get stuck in traffic with temps much above 90F. This bike will likely stay this way until the crank dies then either go to 117 or 113. (Tired of the 4 5/8 crank and 1200 gram piston weights) You can probably trim the domes some is you want to drop the CR some.. Get it down to say 11 to 1.

 

 

Max. You obviously know what your doing and can get away with a little higher dynamic compression... But putting 11.5:1 on a 53* ivc is pushing it for a novice. His tune would have to be so spot on and on a day's that it does hit 95-100*... Well he could be screwed... But what ever, it's not my bike and this ain't a pissing contest...

By the way@11.3:1@55*ivc, is not a fair comparison...

 

I guess you misread this.

"You can probably trim the domes some if you want to drop the CR some."

 

11:1 static with the 263E nets me really decent theoretical numbers at sea level and my altitude of 2200.
The heads will be more than able to support this once done.
I need to choose my cam and plan before sending them off though.

I'm not seeing the sky is falling scenario here.