zenbiker
Zenbiker
Does anyone know if these are removed with the Carpenter build? I think so but am unsure.
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Throttle body upper plates
- Thread starter dbutton12
- Start date
I opened the secondaries 100% using Tuneboy. I noticed with the engine running under idle, the secondary plates were closed. I never ripped them out so I don't really know how that works. It doesn't seem logical to remove the plates physically when the ECU "thinks" they're still there. As far as turbulence goes, I would imagine they would act as flow straighteners when 100% open.
When I talked to Carpenter, they were using Tuneboy to tune the thing, so they would open the secondaries that way.
zenbiker
Zenbiker
I understand but my impression was that Carpenter physically removes them.
HansO
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OK while I ain't No Expert on these engineering matters What I do know and learnt from hoting up old Z1 900 Kwaka (and numerous 2strokes) back in the day and Also a couple of Winsor V8's, is this when porting your inlet ports You never polish them and infact it is better if opening them up to leave some small ridges to create turbulance and therefore better Atomisation giving you a better faster burn = more power.
I removed my Secondaries for much the same reason if you leave them in it slows (drag against the flat surfaces) the fuel/air mixture and possiblly straightens it (not desirable) but it hinders the swirl or turbulance. The shaft left in there after the removal the secondaries still causes some drag but not to the same degree and if it were possible to remove that shaft and not upset the sensors at either end of said shaft, you could attain even better flow, in the old smooth bore carbies the idea was to get the air moving as fast as possible before introducing the fuel so think of the throttle bodies in the same way you have a nice air flow happening (and air generally flows with a swirling motion) and you have a flat plate disturbing that it, it will slow that air down and as said the shafts will slow it down a fraction but not to the same extent.
I hope that make sense to you
Ps I doubt Carpenters or Nevill Lush would leave them in
I removed my Secondaries for much the same reason if you leave them in it slows (drag against the flat surfaces) the fuel/air mixture and possiblly straightens it (not desirable) but it hinders the swirl or turbulance. The shaft left in there after the removal the secondaries still causes some drag but not to the same degree and if it were possible to remove that shaft and not upset the sensors at either end of said shaft, you could attain even better flow, in the old smooth bore carbies the idea was to get the air moving as fast as possible before introducing the fuel so think of the throttle bodies in the same way you have a nice air flow happening (and air generally flows with a swirling motion) and you have a flat plate disturbing that it, it will slow that air down and as said the shafts will slow it down a fraction but not to the same extent.
I hope that make sense to you
Ps I doubt Carpenters or Nevill Lush would leave them in
If you send them your head, they don't do anything to the throttle bodies. Like I said, if the map has the secondaries open all the time with throttle, then taking them out can't hurt. However, at idle, the ECU wants them closed. This may not make any difference at all - it may just require resetting the idle.
zenbiker
Zenbiker
Sure Doug with just the headwork I was referring to when Carpenter does the full job with pistons. I'll have to ask him.
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