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Mar 30, 2018 | 12:40 AM

#11

BB59

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From: Hayward Ca

Quote:

Originally Posted by seanl

I was waiting for someone to chime in that unless you increase the compression, the gains will be fairly moderate.

I'm still with stock 96 inches (13k miles), but won't do the pistons and jugs unless I can increase the compression to 10.25 or 10.5:1 to see (and feel) good bang for the buck gains.

Take a look at Fuel Moto's site with regards to all the dyno graphs of various 96 and 103" combos. You'll see a more torque with the 103, but still probably around 95-100hp with stock compression.

I'm not an expert by any stretch, but I've been researching my next upgrade from 96", and it seems the compression is more important than the cubes in terms of performance gains.

My sons '06 RK with a 98' motor, head work, cams, 10.3:1 compression and a D&D fat cat runs circles around my buddies on their new $40K 110" CVO motors. Drives em nuts

Mar 30, 2018 | 05:16 AM

#12

paddywagon

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From: Naples florida

Quote:

Originally Posted by BB59

I have my ACR's wired into the starter on both of my bikes that have them. It eliminates kick back issues on higher compression motors.

Also, I would consider going with a .30 head gasket as opposed to the stock gasket. The '16 Rushmore motors were running 9.7:1 compression. Dropping to a .30 gasket would get you close to 9.9:1 at no additional cost.
Depending on the cams you select for not a lot of money you could have another .005 or .010 decked off the heads or juggs to get you closer to 10.3:1 or 10.4:1. You would need adjustable push rods if you went this route but the bump in compression is where you are going to make significant gains in HP and TQ

Am i reading that right? simply using a different head gasket will up the compression? As much as I'd love to have the heads done, another almost $900 (fuel moto website) doesn't really seem to be in the budget, so if I can up the compression that way even just a little, it's a help.

Mar 30, 2018 | 05:26 AM

#13

Hillsidecycle.com

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At the point of the 103" install, an Andrews 48, or a CR. 575 (using a .030" head gasket) would be an absolute home run, without a large expense.
Scott

Mar 30, 2018 | 06:16 AM

#14

paddywagon

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From: Naples florida

Quote:

Originally Posted by Hillsidecycle.com

At the point of the 103" install, an Andrews 48, or a CR. 575 (using a .030" head gasket) would be an absolute home run, without a large expense.
Scott

I was looking at a 585 gear drive cam, or would that be over camming it?

Mar 30, 2018 | 06:42 AM

#15

Notgrownup

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From: Snow Hill, NC

I put a complete 103HO on my 07 FLHTC... I had to reuse my throttle body because my bike is cable throttle...went right in easy peasy...
If anybody needs a throttle I have one from a 14. 10k miles on it...
You will love the extra oomph!

Last edited by Notgrownup; Mar 30, 2018 at 06:45 AM.

Mar 30, 2018 | 07:07 AM

#16

todd-67

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From: OH

I used low mileage take offs as the base for my build. The harness for the ACR's is about $70. I agree with Scott's recommendation of cams and the .030 gasket if you're on a budget. Having the compression releases opens up and future possibilities.

Apr 7, 2018 | 09:14 AM

#17

paddywagon

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From: Naples florida

So, a little bit of an update...
I wound up agreeing on a deal that will net me the complete top end off the 2016 103 that is coming apart with 100 miles on it. For $600 shipped (a pretty good deal I think) I'll be getting the heads, jugs, pistons, injectors and throttle body. Not sure if the throttle body and injectors are any different than what's currently on my 96, but it's all coming from the same motor so I figured it cant hurt. Now I'm trying to decide if the use of a gear drive cam is really worth twice the price. I cant check the run out to see if it's in spec until the bike is apart, which would add up to extra time down which I'm really not looking to do.
Tuners? haven't heard anything too great about the Harley tuners. The names I'm hearing are power vision and TTS...thoughts?

Apr 7, 2018 | 10:54 AM

#18

BB59

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From: Hayward Ca

Quote:

Originally Posted by paddywagon

Not sure if the throttle body and injectors are any different than what's currently on my 96, but it's all coming from the same motor so I figured it cant hurt.

Both the 09 and the 16 are 50mm throttle bodies and use the same injectors #27609-01B. and MAP sensors #32319-07A so it should work fine with your ECU.

Quote:

Originally Posted by paddywagon

Now I'm trying to decide if the use of a gear drive cam is really worth twice the price. I cant check the run out to see if it's in spec until the bike is apart, which would add up to extra time down which I'm really not looking to do.

Knowing runout would be a deciding factor for me. Typically the runout must be within .003 to run gears. Any more than that and you will have noise issues and lose longevity of your motor. The chain drive system you have in your bike is a very good system. Unfortunately of the few dozen of these motors I've torn into only a couple have had .003 or less runout. On all of my own bikes I start by having the crank work done

Quote:

Originally Posted by paddywagon

Tuners? haven't heard anything too great about the Harley tuners. The names I'm hearing are power vision and TTS...thoughts?

Both will work. With the TTS you will have to get Dyno Tuned. With the Power Vision you can get a canned tune that is very close and the Auto Tune will dial it in. If you purchase it from Fuel Moto you get a life time of map and tuning support. They would most likely have a map for your exact set up. When you add mods at a later date you can simply get another map.

Last edited by BB59; Apr 7, 2018 at 11:47 AM.