Author Topic: Vent flaps for engine heat  (Read 4462 times)

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Offline JimBob

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Re: Vent flaps for engine heat
« Reply #25 on: May 28, 2017, 01:26:21 am »
Thanks for the pic, Jim. That's an ingenious approach!


Please keep reporting - looking forward to making some of my own

Offline DaveSz

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Re: Vent flaps for engine heat
« Reply #26 on: May 28, 2017, 12:18:51 pm »
Ok, proto-type installed.  If it works, the large bolt will be replaced with nylon all-thread and a knob for easy removal/install which right now takes about 30 seconds.  Used an old acrylic clip-board which just happened to be 9 inches wide and had finished sides and nice rounded corners.  Only had to cut the 5 inch width and that side is up close to the fairing.  I'll give it a workout and see if it stays in place and doesn't flex too much (or shatter).

Jim,
Looks good.  You've fitted nicely around the tip over bar, and still lined up well with the right vent.  The support from the tip over bar will be great to keep it aligned.

Being on the right side, it anyhow is a larger opening vent, and will have much more hot air coming out than the left vent.  With the throttle clamp on, I like to reach down and feel the heat while cruising, and the air out of the vent is HOT.  Might "bend" the acrylic a bit.  But you have really good support. 

Dave

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Offline Jim

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Re: Vent flaps for engine heat
« Reply #27 on: May 28, 2017, 01:31:44 pm »
Second one is cut, just not mounted, yet.  Should have it completed tomorrow.
« Last Edit: May 28, 2017, 02:52:01 pm by Jim »

Offline Jim

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Re: Vent flaps for engine heat
« Reply #28 on: June 06, 2017, 11:06:04 am »
So far, so good.  Flaps are stable with the single mounting bolt and the outward side slipped over the tip-over bar.  If you try this with tip-over bars, the cutout for the right and left bars are slightly different.  I had to use a small section of 1" radiator hose on the left bar to make up the difference.  It is still a little weird trying to get used to the lack of air mid-calf on my legs but I'm definitely not feeling the blast of heat.  I have my foot vents installed and there is still a good flow of cooler air about a 1/3 of the way up from the bottom for your toes.  I'll try some foam on the upper portion to see if it helps anything.  I've done a resistor mod to the temperature sending unit which makes the temp gauge work over a wider range for greater sensitivity.  At highway speeds on a 95+ degree day, the temp gauge needle is still standing straight up, as usual.  So I'd say there doesn't appear to be any detrimental effects to the cooling system performance (I know, not very scientific).

Thanks again, Dave.  A libation of your choice will be on me. :beerchug:
« Last Edit: June 06, 2017, 11:19:08 am by Jim »

Offline danodemotoman

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Re: Vent flaps for engine heat
« Reply #29 on: June 06, 2017, 11:46:31 pm »
  Don't want to go on and on about it... but...The oem top heat shield should 'snap' in place on locating tabs. If not then much heat escapes over the top.
 I have had 4 c10's and each was different as far as the top shield locating flush on top of the rad. The '01 kept lifting off when re checked.
 Some time in the past another had configured the side vent shields on the rear side.

Offline Jim

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Re: Vent flaps for engine heat
« Reply #30 on: June 07, 2017, 10:53:55 am »
Thanks Dan.  Verified my heat shield was firmly in place when I adjusted my valves back in February.

Offline DaveSz

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Re: Vent flaps for engine heat
« Reply #31 on: June 07, 2017, 04:31:46 pm »
Hi Jim,
Glad that you worked out the fit of the flaps around the tip-over bars.   And that you are getting rid of the heat with them.    Really nice to reach down and feel the heat steaming out the vents, behind the flaps, and passing me by.   Last year, when I was trying out the different size flaps, I pulled off the OEM air scoops, and just never went  back to them.  With my boots on the stock pegs, they are no hotter than anybody wearing tall black waterproof touring boots to do anything in the summer.  The side in the sun is warmer, but that’s about it.
 
To Dan’s point, the fit of the top heat shield on mine was also less than perfect, and still is.  The “gasket” is a bit shabby, and it doesn’t really “snap” into place.  More like just “catching” on the radiator frame on mine.  When I was checking it recently, at Ted’s recommendation, I tried “adjusting” the position, to minimize the gaps.  I  found it to be somewhat warped.  To be sure it stayed in place, I slipped a couple wire ties on, and fastened it to the radiator.   A bit awkward, but possible to get two wire ties on it by just fishing them through the square holes on top of the radiator.  Pretty sure it is tight enough now. 

For those who've had more than one C10, do all of them have the same 1.5" gap between the bottom of the radiator and the oil cooler?  Or am I missing a part?  Why would you want extra airflow going in there?

If I can still buy one, I’ll put in a new $13 top heat shield gasket the next time I do a valve adjustment/inspection.  That will probably be late in 2018.   Like KLRPhil’s, my Connie is parked for the rest of the summer while I work in Europe.  My next ride will be around Thanksgiving.  To my surprise, after two years of retirement in Ohio, a couple weeks ago I was offered my old job back, but this time in Germany.  They made me an offer I couldn’t refuse, for a 6 month assignment.  69 years old, and somebody still needs me!    I’m just arrived at my new (old) job, here on the banks of the Rhein.   For sure will raise a cold one tonight to your “can do” attitude.  Keep up the good work, and stay cool!

Dave
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Offline Jim

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Re: Vent flaps for engine heat
« Reply #32 on: June 20, 2017, 10:34:22 am »
After a 3000 mile trip last week, which included west Texas and New Mexico, I have to say these vent flaps are a winner. :great:  Had one of my vent flaps break almost in half heading into Roswell so I took them both off.  What a mistake!  102 degrees, running 80 mph for hours and my legs were frying.  Put them back on for the remainder of the trip and it was immediate relief.  The single point mount and the notch over the tip-over bars worked great.  Even the one that lost the upper portion stayed in place and survived another 1800 miles.  The acrylic was too fragile to withstand buffeting from trucks, RVs, etc.  I'll go ahead and pick up some lexan and make some new ones.

If you ride for long intervals in elevated temps, you will absolutely feel the differences.  Even the right side vent, which had lost the top portion, still significantly reduced the heat on my shin and knee to the point that I was comfortable.  These are well worth the time to make and install and I can confidently now say they have no adverse effect on the cooling system operation.

One other side benefit I noticed was reduced helmet buffeting.  I thought this was just my imagination, but these do produce a noticeable reduction in buffeting from semi's, pickup trucks and crosswinds.  I have a 2.5 inch extension on my stock windshield so your results may vary.

Thanks again for sharing this idea, Dave.  These really made a difference on this trip.
« Last Edit: June 20, 2017, 12:05:51 pm by Jim »

Offline DaveSz

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Re: Vent flaps for engine heat
« Reply #33 on: June 21, 2017, 05:56:17 pm »

Hey Jim,

Thanks for your post.  Really good to hear how you are mastering the vent flaps,  tip-over bars and all.   And what a test!  “Long intervals in elevated temps” certainly applies.   Back in Ohio we’d be hiding in the basement on days like that.  Great that you’ve tested them so well down in the SW.
 
I never doubted that the cooling was OK with the vent flaps.  My temp gauge creeps up in traffic, and from 35+ mph up, when the vent flaps start to pull a bit, the temp drops pretty quickly.   
   
My stock windshield was pretty well scratched up when I got her, so after a year, I bought a tall CeeBailey screen with no vent,  and cut it to the same height as the OEM one, so I just look over the top. It has the advantage of being visually clear, and without the curl, doesn't have that buffeting going on.  But I do notice a bit more protection on my legs when riding in the rain.  Vent flaps pushing the rain out a bit farther, along with the heat. 
 
When I was a boy, I spent a year in ‘Nam patching up Hueys and such.  So aluminum is my first choice for tinkering.  With my teenage boys riding my old Hondas, have for sure had to learn some ABS repairs.  But never worked with Lexan.  Can it be heated and reshaped?  Anyhow, looking forward to seeing the deluxe photos once you get her upgraded to Lexan.   Good to share with the guys that also have tip-over bars! 

Long days in the factory here in Germany.  Walking home in the evening, I’m seeing every kind of motorcycle imaginable whizzing by.  Yesterday I saw a bright yellow C10 with matching side car!  Missing my Connie, for sure.
 
Keep up the good work, and stay cool!

Dave
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1993 C10 w/103K
1996 Honda CBR600F3
1987 Honda VFR F2
1985 Honda 650 Nighthawk

Offline Jim

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Re: Vent flaps for engine heat
« Reply #34 on: July 13, 2017, 10:34:58 am »
Here's the final version made from Lexan.  Definitely not for show (still a little cleaning up to do) but they absolutely work.  Per Dave's recommendation, the flaps are 9"x5".  Used 3/8 fuel line cut at a 18-20 degree angle to force the flap firmly against the tip over bar.  The nylon bolt is a 3/8-16, 1.5 inches long.  Between bottoming the bolt into the clamp and the tension from the angled fuel line, everything stays put.  Removal/install takes seconds and they store flat against each other if you should decide to remove them while on the road.  I did glue a narrow strip of lexan on the side next to the fairing to help with the flex.  Also glued 2 small squares of lexan on either side where the bolt goes through the flap.  The flaps are positioned about 1/4" away from the fairing.  Split vacuum line glued on the inside corners are there just in case something touches.  These flex very little, as is, and with a thicker piece of lexan, flex would probably not be an issue at all.
« Last Edit: July 13, 2017, 11:51:15 am by Jim »

Offline Stealth Connie

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Re: Vent flaps for engine heat
« Reply #35 on: July 31, 2017, 12:27:20 am »
I'm glad you posted the pictures with the bar/highway pegs, because that's my #1 question.

I can see how this would help cool the legs, while on the factory pegs, but how does it feel when your calf is right at the edge of the flap? 

I have the single bar, foldable highway pegs (made by Miller I think it was???).  Anyway, when is 90's here in Georgia, my legs are not bad if pulled against body (knees touching tank). If I really bow-leg it, knees way out, it's not bad, and legs a few inches off the sides, shins lined up with scoops, IT BLAZING.  It feels like the scoops take the air coming OUT of the side vents, and pull into my shins.

Almost makes me wonder if we have the factory scoop thing backwards?? PUSH hot air from vents OUT in the summer, and PULL hot air from the vent IN during winter.   :-X

Anyhoo, when I use my highway pegs, inside of my calf barely touches the top edge of factory scoops, and I feel a good bit of heat just in that one spot. 

Have you found that you need to change the way you use highway pegs with this mod?
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Offline Jim

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Re: Vent flaps for engine heat
« Reply #36 on: July 31, 2017, 10:00:50 am »
You're right about the scoops channeling hot air back onto your legs.  The top third of the scoop is right in line with the exhaust from the fairing vent.  When I'm using my highway pegs I don't recall feeling any more warmth on my shin by the flap but there is so much turbulence from my foot sticking out in the air I'd expect any heat to be well dissipated.  That's based on a 102 degree day, 75 mph with just shorts on under my mesh riding pants.  If there was more heat present, it certainly didn't stop me from using the highway pegs.  If you want to be sure how this is going to work for you, duct tape a 9" x 5" piece of heavy cardboard to the fairing and notch the other side by the tip over bars.  My initial cardboard setup lasted for days even at 70+ mph.