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-   -   New front dam, splitter, undertray install. (

westygo 01-13-2019 03:40 PM

New front dam, splitter, undertray install.
2 Attachment(s)
Last year I had great success with a simple front airdam on my '98 Odyssey (first generation built on Accord chassis)
The underside of this car is UGLY!
That airdam broke off and I've been tinkering at this new one for a while. Finally got it together and installed.
Here are some pics.
Used 1/8" black ABS sheet, garden edging and push type plastic connectors as well as these nut inserts.

freebeard 01-13-2019 04:55 PM

I like it. I need to do something similar to my Dasher.

Do you think the flanges at the ends act like Gurney flaps? Would those act opposite to an air curtain?

westygo 01-13-2019 10:49 PM

Thanks Freebeard
I think they act a bit like gurney flaps, and kick the airflow out to the outer edge of the tire. (They stop about 1-1/2" inboard of tire edge) Not sure how they would compare to an air curtain though.

freebeard 01-14-2019 01:31 AM

I thought a Gurney flap causes the air to wrap around the edge. I may be wrong.

OTOH it may act more like a bug deflector. :)

freebeard 01-14-2019 03:43 PM

This is on-topic.

The infinity wing is very close to what you have. Adding a triangular end plate might be enough. It presents a concave curved surface, but that might not be important.

Basically it induces a vortex over the top third of the wheel's face, creating an air curtain without the external duct.

kach22i 01-15-2019 10:56 AM


Originally Posted by westygo (Post 588618)
Here are some pics.

Fantastic westygo, I've been posting ideas on using with serrated lawn edging in an attempt to get someone to build it for a few years now.

My own chin spoiler experiments and develop lead me to believe this would be the superior conclusion.

The chin spoiler on my truck has held up so well I never had a reason to do it there. And on my old Porsche I have other plans that include a larger deflector style plate/pan splitter/undertray for steep driveways.

I've booked-marked this thread for next time someone asks about chin spoilers.

The only deviations I would promote over what your have done with serrated lawn edging is using conveyor belt material in lieu of ABS and perhaps rethinking the Gurney flaps at the ends. I like them for the added strength factor, still on the fence about the drag aspect. They are small compared to the rest of the car, so you have that in your favor.

As it stands, this is a most excellent example of how to do a chin spoiler.

Any additional documentation and photos of the attachment, back support and reinforcement details would be appreciated.

I want to see more of that "undertray".

westygo 01-16-2019 02:07 AM

Thanks guys.
I don't have much more in the way of pictures. To attach to the car, I used pieces of the edging attached at factory points, then used the plugs you see in the pictures. It's also held to the factory plastic under tray using the plastic pushnuts. It worked out well and became one of those projects where simpler worked better. :-)
What are your thoughts on the Gurney flaps?
Kach, I will look up your threads to see what you've been working on.

westygo 01-16-2019 02:10 AM

2 Attachment(s)
A couple more pics

kach22i 02-12-2019 08:13 AM

Looks great.

When the day comes, hopefully far in the future, please post it's deterioration and or demise and the conditions under which it happened.

Looks like it will last years, hoping for the best.

NOTE: If you can avoid parking on the street where people parallel park by braille it will last longer. There are some real dingbats out there.

westygo 02-15-2019 12:06 PM

The plastic pop nuts seem to be the weakest link. The first ones I got were a bit short and a couple popped out (guess that's why they are pop nuts).
I'm thinking nylon bolts and the same type of captured nuts I used on the bottom will work better and not risk popping off.
As far as being hit, the whole splitter is just a hair back from the bumper perimeter, so the average bad Parker isn't an issue, but I have to be careful not to hit it on a curb when I'm pulling in nose first.

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