Not sure what gas you are using but 29 deg full advance is likely too much. My 107 EGC 10.5 to 1 W777 only runs 25 degrees full adv. My 11.3 to 1 FXDX only ran 25. As a 107 it's about the same.. The thing is that with a tight squish, the motor can still have too much advance to the point of power loss and not ping.

 

Mine was tweaked on the dyno for max power at the end of tuning and gained the last 1/1. One cylinder hit 29° at I think 5500 then back down a few degrees. The other cylinder I think was 27.X . I'm going by memory and I can look later but I'm pretty certain.
91 octane from BP. One of two places I normally fuel. The other is a citgo with 91 pure gas.
It was a cool spring day.

 

Was this monitored timing or table timing?

Other than to control the ping and using calculated chamber temps, what else mods the timing at a specific RPM/MAP? TPS?

 

Table timing. Map based. Head temps, IAT does pull it at a certain point. I don't remember exactly how it's set up to do it. I did look at the timing tables. Front cylinder is 29° at 6000rpm 95 to 100kpa.
The rear is 26.5 at 6000rpm 100kpA. 27.2 at 95kpa.
My 127 max hp is at 5750rpm.
5500 rpm is Front 27.4 at 100kpa and rear 25.1.

 

I appreciate everyone's input and to be quite frank without getting it on a dyno, I'll really never know what needs to be precisely done to get the final tune where it needs to be. The one person I thought I could trust I don't. And then the one person I wanted to well just pacified me and kind of dicked me around.. So maybe I'm just wasting my time but that's the one thing I do have so..... I'm thinking I'll most likely have to take it Upstate to where it all started many years ago..

 

You're right. You won't. My feeling is you're running out of air in. Cam? Losing velocity? What rpm is this 131mph where it quits?
More exhaust might help a little... Might hurt a little too.
I think this is the area when intake to exhaust valve size ratio, just how the heads are ported, and intake/exhaust duration make a difference as much as pipe size.
​​​​​​​

 

I'll have to look at my spreadsheets when I get home tonight after work to see what the RPM was at speed.. I don't really look at that at speed.. I'll post something up tomorrow. Valves are 1.90/1.61
You might be onto something there with 110" motor.. My intake might be a little small.. But then again that would ensure better velocity..

 

What gap you running? Try .030. I would rather close gap and get the pressure in the cylinder when it needs it over running a larger gap and having to retard the timing because of the knock sensing. I have a customers bike gap set at .020. It isn't slowing him down.

 

Or maybe a smaller exhaust valve? I run the 1.615 with a 1.980 intake. And it's run with a 2.0.
And note the dyno above and the exhaust as well as the TB size used with the pro touriing heads and 625 cam. It's a 107 but really there's not much difference. Same heads here.
So is TB too big? Is intake valve too small? Or exhaust valve too big for the intake? I've been trying to learn more on the relevance of the exhaust side as far as valve size and cam specs but nothing concrete except it's more important than most think. Myself included. Even lobe shape and design.

 

.038".. I'll try a smaller gap.. Thanks.. Right now I'm waiting for my exhaust pipe O2 bungs to be welded in..