throttle body spacer

[kman240]

So I went to look at one of these for a mustang bc I was interested in what they do, now what I noticed is that it possibly increasses velocity of the air by having a smaller diameter hole than the throttle bottle....isnt this what the butterfly valves do. What Im wondering though is would removing the secondary butterflys and fabricating one of these possibly produce some power.

[Aries]

you would not produce any more HP, however it will raise the tq numbers slightly (1-4).

[C-Kwik]

If you are speeding up the velocity of air, typically, you are impeding flow. There is always a compromise between flow and velocity. The makers of that spacer probably did some research to find that they can receive an increase somewhere with little or no sacrifice elsewhere. Don't just assume it will work on a KA or any other motor.

[node]

The spacer is usually made of some sort of insalating material like phenalic resin. The spacer keeps the engine heat from being conducted into the intake manifold. This in turn keeps the whole intake from heating up(assuming you have blocked off your throttle body coolent lines). Anyway since the entire maifold is cooler the air going into the combustion chamber pics up less heat on its way in. This in turn produces more power, well thats the idea anyway im sure there are some other uses on the v8s that have to do with proper mixture and such.

If your interested some guys on the MR2 weboard did some dyno pulls with and without an insulating spacer. you will have to search for it though. http://www.board.mr2faq.com I think

[Scott McLellan]

Speeding up the air can also help suspend the fuel mixture better. I don't know exactly why this works, but some throttle body spacers have spirals or something built in to cause turbulance which seems like it wouldn't help but I guess it must work. I don't know what design you were planning on fabricating. How thick and what material would you use?-Scotty