Does anyone know the approximate CFM rate for the 928 air pump at idle. Just curious how much air it is designed to move.

Thanks!

 

only data i have is for a GM electric 2001....60 cfm...a small leaf blower

 

At what rpm?......

 

...no, it wont produce any boost on your engine.

 

LOL.

 

Thanks

 

650

 

Not why I'm asking!

 

Hi Antsmands; Are you asking for a reason related to crankcase ventilation?

 

The airpump is made more for pressure than volume, AFAIK. The injection holes in the cat are quite small.

The airpump tube(s) connect to a tube which runs across the width of the cat, toward the rear, between the two honeycomb sections. The internal tube has small holes pointing toward the engine.

 

Not much pressure to overcome even precat, maybe a couple PSI?

Would the volume need to be more than maybe 10% of the flow through the intake system?

 

Colin (lizard) should know this data....... I know he had one tested recently

 

10% of the flow of the intake at high rpms is a heck of a lot - just consider the size of the pump chambers compared to the airpump size...

Alan

 

No, not related to crankcase ventilation or engine performance directly. Thinking about getting rid of the cats and wondering if its worth repurposing the airflow for additional cooling air for the alternator while sitting in traffic. I already added an extension hose from the front area of the nose to the inlet for the pump to provide cooler air from there instead of the air heated by the engine in prep for this. Just wonder if there is enough CFM at idle to improve cooling of the alt to make it worth keep the pump instead of trashing it all together. I can feel the air being drawn in at the extension inlet but can't really tell if that flow is enough to make it worth completing the project.

 

Finally got around to completing phase II of this project. Redirected diverter to air box hose to a supply hose made from 5/8 heater hose:

Routed around engine compartment to a supply T-connector built from schedule 80 pvc:

Attached between original airs supply hose from front fender to alternator air supply cowling using gorilla tape, silicon tape and hose clamps: [ATTACH][/ATTACH]

Have not had time to do any temperature testing yet on a really hot day so dont know if it will make a significant difference in alt performance but I don't think it will hurt. The third phase will be completed when I remove the cat and redirect the hoses from the diverter accordlingly.