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Air intake questions - carb'd EA82
Posted 25 February 2006 - 01:09 AM
Either the PCV lines going directly into the air intake is oiling the carb passage and intake and causing the engine to run like crap. Or could it be that the SPFI air intake is too long and the filter is too much for a carb to pull air through. I have a brand new WIX air filter in the airbox.
When I run with the air intake completely unhooked, I get good power all the way to red line.. One constant pull, not start, lag then go like it is with the air intake hooked up correctly.
So what are my options here? I had a cone filter on it 2 years ago, hooked to the SPFI air intake and it seemed to work alright, other than the fact that the filter was simply too small. Maybe I need to get one of those wanna be ricer air intake fans? lol
Either way, muddin season is coming up and I need to have filtered air going into my engine. Gimme some ideas please
Posted 25 February 2006 - 01:18 AM
Try it with just the box and no filter to test the filter flow idea....
dunno - the SPFI should need more air than a carbed block, so it shouldn't make too much difference.... although the ECU on the SPFI has the ability to know the airflow from the meter, and adjust fuel accordingly....
Lots to consider, and tests to be run I think.
Posted 25 February 2006 - 04:07 AM
It sucks cuz I wanna run it without the filter because it runs so much better.
Posted 25 February 2006 - 08:21 PM
This creates a bigger problem for the snorkel conversion I was gonna do. If the carb can't suck enough air through a 2 foot rubber hose, how in the hell am I gonna get it to suck through 6 feet of PCV pipe?
Posted 25 February 2006 - 10:45 PM
Posted 25 February 2006 - 11:36 PM
The reason why the rubber pipe is the cross-section/length it is, is because in the engine's mid-range there's usually a little dip in power output - you'll find the resonant frequency of this pipe is about the same frequency as the engine sucks air at that mid-range RPM, so the air inside the pipe resonates at that RPM, providing an almost resistance-free travel of air through the pipe, though it dumbs down the top-end a bit due to the pipe needing to be reasonably thin. If you were to make this pipe big enough to not constrict the top-end, it'd only be about a foot long, and would void the whole purpose of the pipe anyway.
So in the end, using a bigger pipe or removing the rubber one totally will rob you of a little mid-range but will provide you with some more top-end to compensate.
Posted 26 February 2006 - 04:42 AM
I guess I'm looking for a bolt on filter straight to the carb like the weber guys run. Is the neck of the hicrappy carb the same size as a weber?
Posted 26 February 2006 - 05:03 AM
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