Thread: Waldig tearing apart his throttle body AGAIN>>>>
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Old Jul 27, 2009 | 08:29 PM
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waldig
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From: VA
Talking Waldig tearing apart his throttle body AGAIN>>>>
OK the time is now for the throttle body (TB). Iam installing the modded intake manifolds to test the concept that I have come up with. With the motor torn apart I am going to get the TB checked out to see it there is anything that can be improved on – EASILY…………read on.

I took the photos to show what I found and to share it with you all. This will be so that you can see what’s up and not to have to do it, for the first time. Please look at the photos, I have tried to add some comments on the photos to explain what each is showing.

When I took a look at the throttle body I found three areas that needed to be worked on, per my level of interest and intensity. First the inlet has a lip that is about 1/8” thick, which is a big bump. The TB inside diameter is about 3” and that is about 9” around the lip x 1/8” thick which is over 1” square of lip!!!!!!!!!! I took a carbide cutter and air tool to radius the inlet lip to have a smooth taper. I then took 60 grit paper to hand sand the lip till it got the right look / feel. This came out really easy and looks good to my eye, you could use a hand file or hand drill with a cutter. Its aluminum and easy to work.

I ended up getting a smooth edge that reduced the turbulence of the inlet air to the TB. I gained 35 H/P BELOW 2500 RPM with the design of the dual cai for Needswings. It’s the little things that make all the difference, and when you clear away several little things you start making significant gains. Gains without new parts are the best as they are free power literally.

Secondly I looked at the TB butterfly plate. It is a thick round plate that is way thick and has a square profile = turbulence turbulence…….. I took a simple file and slowly hand filed the leading edge to have a taper. I DID NOT USE A DREMEL TOOL TO PREVENT DAMAGE TO THE DIAMETER OF THE PLATE.

Just cut a 1/8” wide taper on both sides –top and bottom – of the front edge of the butterfly. Do not change the plate diameter, the thickness of the plate is left about 1/3 of its original thickness and is rounded, see the close-up photos. That edge is the one that faces the inlet wye or elbow. I used sandpaper to smooth the front edge and then played with mother’s aluminum – mag polish to shine it up for the squirrel factor in me……. You do not need to touch the rear edge of the plate, its down wind. I also dressed up the long threads of the two anchor screws to smooth them up a bit.

Thirdly I checked the supercharger inlet to see how it looked, its next in line after the TB. The photo shows a large step that was on the lower 1/3 of the s/c inlet, you can feel it big time with your finger, like a curb….bump. I took several towels to plug up the s/c inlet before attacking this. I removed the inlet gasket, bracket to protect it while I used a small ball / round cutter bit to knock down the lip and clear the lump behind it. This took 2-3 minutes and was easy, a good artist knows when to quit so don’t overdo it. Photo shows all the goodies. Clean the surface and then pull out one towel, clean again, pull out the second towel and clean again. Like easy.

Now check again to see that both towels are out – check again…………..

Ill get the inlet back together and then finish the manifolds so that I can test them so that, that can be reported. I must get real results before publishing any data, don’t want to do the “UTAH research” thing to ya..

Please review the photos and Id love to hear your thoughts on this………..WOODY

 
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