Throttle Body design
Throttle Body design
(OP)
I was looking at the TB on my 16v 2L which is 64mm - there are aftermarket units that are 68mm available, however I got to thinking that a slide type TB at 68mm might flow more for given cross sectional area open vs a conventional plate style. What are the pros and cons? Why isn’t there more slide type TB used for automotive use?
Thanks
Thanks





RE: Throttle Body design
They are more complex to make, harder to seal reliably for a stable idle and have much higher friction and potential to stick, making power control difficult.
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RE: Throttle Body design
thanks
RE: Throttle Body design
If you seriously increase the airflow, you might run out of injector fuel flow.
Increasing throttle bore dia might increase airflow, depending on how restrictive the current one is compared to everything else in the system.
Increasing throttle body size at the numbers you state probably will increase airflow.
It should not prove detrimental to bottom end power.
It will most probably increase inlet tract noise.
It will make the throttle action more sensitive or touchy or snappy.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Throttle Body design
A couple of hours attacking the shaft with a Dremel tool should do it. I'd leave the shaft at full thickness around the butterfly retaining screws, and stake and Loctite them on reassembly.
Mike Halloran
Pembroke Pines, FL, USA