CVO Technical > Twin Cam

117 TC Dyno Test. Stock CVO Ventilator VS Open TB

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Fullsac Performance:
Occasionally I work with other shops on builds that use my exhaust. Schultz Motorcycle Service in Yuma Az is one of those shops. Don Schultz has done more than a few nice 117 builds that get brought my way for the break in and dyno tune. These Yuma boys roll in the heat! The timing tables have to be spot on or there will be pinging issues at 10.5 compression. I know going in the expectations are high.

Yesterday Don unloaded a nice 2016 water cooled CVO Roadglide with the following parts.
117 top end kit, .030 head gasket.
Stock heads with beehive springs
58 SE TB, 5.3 inj, Ventilator AC
TTS 150 cam, TTS Mastertune Tuner
Fullsac DX Pipe, 2.0 baffle, Techmat


A simple proven cocktail that makes big Torque early and 120/130 every time. Well almost every time and that's what this thread is about. The last 117 Don brought for dyno had the Heavy Breather AC. Rolled out 120/130. Today's bike had the stock Ventilator with a bored backing plate to match the 58 TB. Final pulls were 116 HP and 129 TQ. Don doesn't look too pleased? I suggest we remove the stock CVO Ventilator and make two more pulls. Like Magic, 120 HP and 131 TQ. Once again the simplest part on the bike is working against us. The real point I want to make is the power loss was across the entire RPM range! Not just the top end numbers. The lower in the power band you go the greater the percentage of loss. It's 5 ft pounds at the hit! That's almost 5% torque loss starting at 1800 RPM. Unacceptable. Not sure what AC Don is going to upgrade too, but this is why we use dynos.

Next time you read a thread where it's mentioned the stock CVO AC is just fine. Well just fine if your willing to loose 5% of your low end power. I'm out.

Special Thanks to

Schultz Motorcycle service of Yuma Arizona for using and endorsing our exhaust products and dyno services.

Steve@fullsac.com

Threephase:
So the stock air cleaner is like your like your bike has the corona virus? It can't breathe.

Fullsac Performance:

--- Quote from: scotman623 on April 08, 2020, 01:37:19 PM ---Thanks for sharing!!! I used your ventilator extreme on my 128 build with great results.. The oem system on my CVO RG was screaming for more air on the Dyno before the change out..

--- End quote ---

Ventilator Extreme? Sounds cool but not a product I made.

Steve@fullsac.com

grc:

Speaking as just one of the people who have replied to questions about air cleaners by saying the Ventilator is already a high flow filter, you need to understand the context.  Those answers were provided to people who did nothing more than change the exhaust and were asking if they should install the SE air cleaner or other high flow unit for more flow.  They obviously didn't know that the stock Ventilator was a much higher flow unit than the stock air cleaner on the non-CVO models.  When you start doing major internal mods, including displacement increases, heads, cams, and throttle bodies, I don't think I or any of the others told anyone the Ventilator was still the best choice.  It isn't, and I don't think any of us would tell people otherwise.

Jerry

Fullsac Performance:
The point of my post was to show how the power loss from the stock CVO AC starts at the very beginning of a dyno pull and continues to the very end. The air is forced to make a very sharp 90 degree turn to enter the TB due to the low height of the lid. The results are exactly the same on a simple stage I build. I wasn't trying to call anybody out. I just like to share technical findings from my dyno room to the few who have interest. And when I have a bike with the stock CVO AC in my dyno room and a customer with high expectations, I have to tell it like it is.

Ride safe.
Steve@fullsac.com

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