Our 2003 RK EFI had buffeting issues when first bought, considered as normal as riding as every other ride I had except the rice burners were open air no shields.

I started with the triple tree baffle made some difference, with the shield aged and scratched added a longer shield, made it worse again. Invested in the fork side shields again much better where I bit the bullet and went to a detachable fairing from Dead Center and factory lowers. Looked like a Ultra from a short distance behaved as a Street Glide but most of the issues were eliminated except the buffet steer from large machines on the slab as RVs and semi's.

Did not have engine heating issues with a 88 on a Stage II with a add on fuel management system. Oil temp gauge on dipstick would range to 245 continually originally equipped stayed down around 230 with all the shields in place. Dead of summer or center of KS at 108 highest I ever saw with shields on was 240.

Only significant heat around us was the cross over exhaust that received less down air, that I fixed with under mount dual exhaust.

Could not manage the twitch around big boxy machines so went RGU, never happier.

 

 

​​​​​​​Just so...this works quite well for me!

 

Yep, the pre-2007 Twin Cams, in general, did not have the heat challenges that the 2007-later Twin Cams do.

 

I've had more than a few PM's and emails with questions about the CDW's brought up in this thread.

I apologize that the website is not really clear. We will be making some changes to it to clear it up a bit.

There are two different style CDW's-

1. Fits HD Trikes with a tank lift and looks like this-



2. Fits Trikes without a tank lift and all 2 wheel Touring models (with or without a tank lift) and looks like this-



The reason for the different design is that on all two wheelers, and Trikes without a tank lift, there is less clearance room, so the design is a bit different (and smaller) to get everything to fit.

They both have a "wing" to them that extends out past where the air is that would cause buffeting, this wing is to catch extra air and direct it down onto the engine.

The purpose for designing these was two-fold:

1. Redirect air onto the engine to cool it down. This happens 100% of the time and is good for an 8-15* reduction in engine temps (regardless of design).

2. Reduce buffeting. How much it will reduce it is dependent on dozens of factors. How tall you are, what kind of seat you use, how you sit/slouch, foot/leg placement, type of helmet, etc.

Here are a few photos, side by side, for comparision-







btw, the one made for the two wheelers/trikes with no tank lift, will also fit on the trikes with a tank lift.

Kevin

 

Well this past weekend I got a chance to test the fangs and engine heat. I never took engine temp readings prior to installing the wings so you'll need to take this with a grain of salt.

Bike: 2013 RKC, 3,700 miles. Oil change by Harley dealer at 1,482 miles.
Temperature readings taken with a non-contact infrared thermometer purchased at Menards.
Outside weather was sunning at 75 degrees with 8-12 mph wind out the west. Left around 10am.
Distance: 170 miles each way
Highway Speed: 70 mph

Ride: I took a ride from central IL to downtown Indianapolis. I was riding with the wind when going to Indy. Road against the wind coming back.

Observations: After getting off the highway (158 miles), I could tell that the ETMS kicked in as I noticed the rumble of the bike was different at stop lights. I have never felt this before so I am inclined to believe it was the that as I just did some light research on ETMS and what the rider would feel/notice. Highway to destination was 7 miles through local and city driving.
Upon arrival, I shut down the bike and took temperature readings.

Rear cylinder read 330 degrees, front cylinder read 300 degrees.

I did my business in Indy and headed home, taking same route. Upon getting home, I took temperature readings again.
Rear cylinder read 317 degrees, front read 297 degrees. I did Not experience the ETMS at anytime on my way home.

So with this information, I can agree engine temp did increase. Yes I know I don't have any temp readings before installing the fangs nor did I take the same path in previous rides but in May 2017 I took a ride from central IL to Chicago to St. Joseph MI and back again total 550 miles, 2-up with maybe 30 lbs of gear and few bottles of wine for the lady, ran about 60-65 mph on country roads with a split of 70-30 country to city roads, outside temperatures in the 90s and I did not experience the rumble of the motor from ETMS kicking in on that ride.

Now am I overly concerned about this? Not at this time as this summer has been mild in temps and the ETMS kicked in like it was supposed to but it does make me want to investigate getting more air to the motor. My next step will probably be cooling wings.

On a side note, is an engine temp of 330 degrees a concern?
By my brief search on this site, it is not a concern but it never hurts to ask the great community we have here on hdforums.

 

Ok, DK, this thread has pretty much sold me on the deflectors and tank kit. I'm looking at getting the 1.5 and the deluxe kit (don't want a drastic change.)
Questions;
With the deluxe kit is there still a change in tank capacity? Not that I'm overly worried, I can't see it being much, but I'm curious.
And it talks about moving the tank "back." Not so much that it infringes on the personal space of the "lads", is it?

I'm on a 16 RGU and with past seat configurations there was a junk crushing issue so I don't want to repeat that. Also the buffeting isn't horrible but if I can knock it down even more AND cool the engine (thanks Boston!) seems like a win win.

 

I slowly added everything in this order. Re-curved w/s: Ashtray: Fangs: Tank wings: 1.5" Tank Lift. Fangs were the one item that made a huge positive difference for me.
Today I pulled the fangs, first time since I lifted the tank a couple of weeks ago. Currently I'm using everything I mentioned minus the fangs. Wind buffeting is minimal. It was less with the fangs but I'm going to give it a try for a couple of weeks. I'm pretty sure engine temps may be a little lower without the fangs, and IMO the SGS looks better without Fangs. The tank lift did create a clearance problem, but I got around that ok. I like the looks of the lifted tank and it did help with buffeting in conjunction with the other goodies.
Fangless For Now!

 

If you're borderline on room for the boys right now, you may want to forego using the deluxe option. On your '16 RGU, even without the Deluxe Option you will lose 1/8th of a gallon, at the most, in usable fuel. With the Deluxe option you will not lose any usable fuel capacity. This is with the 1.5" Tank Lift.

 

Thanks. I'm ok but there was an issue with a different seat. Just wasn't sure if there would be a big change. For the price of the deluxe kit I think I'll try it and I'll be sure to let ya'll know!