[Diy_efi] Importance of TPS with lightweight cars

Mike erazmus at iinet.net.au
Tue Jan 14 04:16:57 GMT 2003


At 10:00 AM 13/1/2003 -0000, you wrote:
>Don't think so. Certainly looking at inline 4 bike engines, they are
direct to head with the throttles only a couple of inches from the heads.
Doing very rough volume sum would suggest that this is perhaps only half
the swept volume. Most car installs have >swept volume throttled. 

Now thats an interesting point, now that I look at inlet manifolding
from that perspective, some thing become clear,

With the variable length inlet runners, would one speculate the volume
goes from 1x to 2x swept volume over rev range - shape also has a
major effect ?

And is it feasible/desired to have a non-flow part of the inlet
as just a resonator volume, but not part of the inline flow,
say a tube hanging off the port at right angles to the main flow,
might catch something if excess water injection ;)  ?

rgds

mike


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