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Index > Engine/Drivetrain > Thread: Air control valve
Thread: Air control valve
datsunrides


Revvin Up
Posts: 58
posted October 06, 2010 10:38 AM

Air control valve

Got a quick question. I am looking to remove my air pump as it occasionally makes noises. Since I am going to remove it, does it make sense to keep the air control valve on the intake? My only concern is I still have the stock thermal reactor, so does that require an air pump for cooling, as I see in the service manual? I plan on eventually putting a header on, but not in the near future. So, should I try and find a replacement air pump, or can I safely remove it and the ACV?

Thanks, Mark

       
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RX8Guy


Revvin Up
Posts: 65
posted October 06, 2010 01:01 PM

A major part of the airpump function is coolng the reactor. It is a bad idea to run it without an air pump. that being said, back in the day there were a lot of those trucks running around without an air pump, and I never saw and damage resulted from it. I would at least run me a ram air tube to the inlet of the reactor to flow some fresh air into it.
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Klaus42


Rotorhead
Posts: 1877
posted October 06, 2010 06:09 PM
Edited By: Klaus42 on 6 Oct 2010 18:10

quote:
A major part of the airpump function is cooling the reactor. It is a bad idea to run it without an air pump.
...I would at least run me a ram air tube to the inlet of the reactor to flow some fresh air into it.


Absolutely!

quote:
...back in the day there were a lot of those trucks running around without an air pump, and I never saw and damage resulted from it.


Well, I can't argue with your years of experience, but the way it was explained to me is this: When the engine is shut off, the apex seal spring(s) that end up nearest the hot zone (uncooled reactor) end up collapsing, over time.

I'm also aware that some folks used to modify thermal reactors by repositioning the rear rotor's exhaust insert/sleeve to direct the flow back/out,(as opposed to the stock setup that blasted the exhaust pulses at one another in an attempt at quieting the exhaust...). Either that, or gut the reactor completely.

       
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datsunrides


Revvin Up
Posts: 58
posted October 07, 2010 09:21 AM

What you guys are saying is kinda what worries me about removing the air pump (actually air pump failing). I really don't want to damage the engine with the cost of rebuilds. So, it it just the design of the thermal reactor that needs the air pump? Why is it that headers do not pose a problem?

Mark

       
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Klaus42


Rotorhead
Posts: 1877
posted October 07, 2010 10:02 AM
Edited By: Klaus42 on 7 Oct 2010 10:02

The header is designed to FLOW the spent gases out and away ASAP; the thermal reactor to retain them as a post-combustion combustion chamber, for emissions purposes. Likewise, the thermal reactor has much more thermal mass, and retains more heat... like it was designed to... IMO.

       
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