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[98fxstc]

I have some questions for the high compression guys.  11 or higher. Do you have to disable the knock sensors to keep the bike happy?

I've heard that this might be required. Heck my 117 was pulling the max of 6deg of timing when I was with SEST tune from Harley. They were trying to run 30deg of timing in front cyl.

I already see knock with .30 head gaskets on my 117 on 92oct.

Bad idea to disable the knock sensors
Sounds like you need to find a capable tuner

[Burningcoals]

Huh? You do realize that even with perfect AFR you are going to get knock. The tuner I am using now tunes AMA and superbike for factory teams. My 117 tune is butter smooth and I gained 9wtq over what Harley did.

The ECU can only pull so much timing. In some cases with high compression and heat the bike just won't make good power as you are fighting the conditions and low octane. Many big power builds disable knock sensors or at least dumb them down. Happens in the car tuning world too.

My Audi can pull 18 deg of timing , Harley can pull 6. Tune the Harley so that it doesn't pull any timing and unfortunately with perfect AFR it's just not making the expected power. All tuners end up dealing with this.

My current tune pulls no timing because we only add what it will take. In my case 23deg of timing on the front cyl, 22 on the rear cyl. We gained power keeping the bike happy.

Then there are bikes that come in with 11:8:1 on 92 octane and the bike is never happy and timing is reduced further. If you build a motor capable of handling more knock than the ECU is designed for something has to be done to maximize power. You can reduce knock sensor sensitivity many ways. Even getting aftermarket sensors, spacers, or modifying the ECU.

I am mainly looking for feedback before I choose to go higher compression. Trying to decide what I want my limit to be.

I'm not looking for a dyno sheet. I'm looking for a reliable amount of power that can sit in traffic and deal with heat.

[cvosjoe]

All I can say is that my build makes good power, runs very smooth and has great throttle response. It runs well in 95+ temps with no detonation on slight roll on or full throttle.

[Para Bellum]

Huh? You do realize that even with perfect AFR you are going to get knock.

Wait, what?  "Perfect AFR?"  No such thing.  It's always a compromise, but with reasonable compression, air temps under 95*, and decent octane you can minimize knocking.

Many big power builds disable knock sensors or at least dumb them down.

And the Navy says "any ship can be a minesweeper--one time."  That principle holds for hard-ridden bikes with disabled knock sensors.

I'm not looking for a dyno sheet. I'm looking for a reliable amount of power that can sit in traffic and deal with heat.

You're riding a Dyna with a big heater in it.  Unless you've added an oil cooler and/or fans, more squeeze + traffic + summer heat does not make a heat-lover.  So if you don't want a brag sheet and you do want reliable, you might also want the CR to be in the reasonable range.  And as cvosjoe said, the cam has a lot to say about "reasonable."

[FLSTFI Dave]

Mine runs very smooth.  I have yet to hear any knock or ping under any riding conditions, and temps have been in mid 90's recently.  I have been running 93 octane.  My build is the same as Joe's.  Power is very good.

[Mickle]

I am about to have the 117 kit installed 1 question I have is should I be doing anything else whilst getting this work
done, I have done 51,000km on this engine, the workshop has also suggested using the 258 HD cam (I am not convinced)
cam support plate and high volume oil pump and high ratio rocker arms. yes this is a dealership doing the work, 2015 Twin cooled Ultra Limited.

[happyman]

I am about to have the 117 kit installed 1 question I have is should I be doing anything else whilst getting this work
done, I have done 51,000km on this engine, the workshop has also suggested using the 258 HD cam (I am not convinced)
cam support plate and high volume oil pump and high ratio rocker arms. yes this is a dealership doing the work, 2015 Twin cooled Ultra Limited.

run the 259 cams that come with the kit. the rest of the parts your dealer suggested are more money spent and of no benefit .   use all that extra  $$ amd put fuel in the bike and enjoy it .

[HD Street Performance]

Consider a few things about the HD system and high performance twin cams in general, especially after modifications.

The Delphi ion sensing system is not perfect and often times can false detect knock. Tuners that are "recipe tuners" pull timing and then they get slugish, run hotter, and loose power. Sometimes the system needs to be toggled off and listening for knock plus knowledge and experience dictate the timing curve.

Oil in the combustion will kill octane and cause knock plus build carbon fast.

Any high performance twin cam needs a good oil cooler and wards fans or equivalent in my opinion. Not the most comfy for the rider but the motor life is extended.

[RoadDawg]

run the 259 cams that come with the kit. the rest of the parts your dealer suggested are more money spent and of no benefit .   use all that extra  $$ amd put fuel in the bike and enjoy it .

X2 as long as you're staying with SE cams. This cam has proven itself in other SE117 builds. Check the dyno charts in this thread and see for yourself.

[GRam]

Had this "kit" installed the other day. Actually, just jugs/pistons. Re-used a bunch of goodies I already had;
S&S premium lifters, TMan 625's, MVA heads decked to get 205 ccp (right where TR said to run the 625 cams),
58 tb with 5.3 injectors, V&H power dulls and HO slips.

Hopeful for decent numbers, Russ @ Lonewolf Perf will be putting the final touches on the tune. Heading out for a beauty road trip
with my brother, Oregon coast, Cali, Nevada etc, hoping I make er back without having to shell out for that 124 I always wanted! 

[HD Street Performance]

Let us know how it does. Just completed a similar trip to Gold Beach Or.

[FlaHeatWave]

Had this "kit" installed the other day. Actually, just jugs/pistons. Re-used a bunch of goodies I already had;
S&S premium lifters, TMan 625's, MVA heads decked to get 205 ccp (right where TR said to run the 625 cams),
58 tb with 5.3 injectors, V&H power dulls and HO slips.

Hopeful for decent numbers, Russ @ Lonewolf Perf will be putting the final touches on the tune. Heading out for a beauty road trip
with my brother, Oregon coast, Cali, Nevada etc, hoping I make er back without having to shell out for that 124 I always wanted! 

'Running pretty much the same combination, smaller Mufflers, T-Man Heads... You should be able to run right with the 124 Crates   

[GRam]

Good to hear! Have a cousin with a crate 124, and he pretty much hasn't shut up about kicking my butt for the last year and a half or so lol.
If nothing else, give him a surprise I bet.  Feels a bunch better than it did with same stuff as a 110, thinking the higher compression
helped out a bunch with that.
Can't wait to get e proper tune in it and see what she has!! 

[FlaHeatWave]

Good to hear! Have a cousin with a crate 124, and he pretty much hasn't shut up about kicking my butt for the last year and a half or so lol.
If nothing else, give him a surprise I bet.  Feels a bunch better than it did with same stuff as a 110, thinking the higher compression
helped out a bunch with that.
Can't wait to get e proper tune in it and see what she has!! 

LC or HC... Don't much matter... o'l cuz is in for a little suprise 

[NJOrangeEagle]

Left my 09 CVO Road Glide and a fresh 117 kit (with Diamond Cut jugs) in the capable hands of Andrew "Rosa" today.  I HATE driving to Long Island (took me 3 freakin hours to drive the 50 miles) but after getting a tour of the shop and meeting Andrew and the crew it was SOOOOOO worth the trip.  These guys are the real deal when it comes to go fast Harleys.  The equipment they have is all top notch and the number of drag racing awards around the shop speak for themselves.  After doing a bunch of research and talking with a few local shops and dealers, I have absolutely no doubt that I made the right choice. Heck they even gave me a free t-shirt. I cannot wait to see what I get back next week.