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Instructor
Joined: Dec 2004
Posts: 124
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From: Winter Haven Fl
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Waiting on a set of shorter prods from Smith Brothers; meanwhile new engine started, 70psi oil pressure, all is well except pushrods are keeping valves off seats. Started new engine on the stock 85mm maf, how will I know if I need to replace with larger unit? New engine is 383, fast 102 and AFR 215 large port heads both massaged by Tony, Jesel shaft rockers, NW 102 tb, 227/231 lsl Comp with full exhaust. Thank you
Instructor
Joined: Mar 2014
Posts: 205
Likes: 0
From: Alpine TX
I would not run an engine with the valves not seating. Good way to burn a valve, and any backfiring can cause damages. When you start an engine with a new cam, there is a specific break-in procedure. You don't want to idle a new cam. I would wait till the new pushrods come in before you wipe out a cam lobe.
Instructor
Joined: Mar 2014
Posts: 205
Likes: 0
From: Alpine TX
Not sure if this will help you or not, but IIRC, you need a tool such as a lab waveform scope to be able to read the output frquency on most modern MAF sensors. It will let you know if your MAF output signal is maxed out prematurely.
Older MAF's, you could measure the voltage. 5V being max.
Probably easier, but not necessarily cheaper (IDK) to go aftermarket MAF once intake, injector, porting, cam etc... changes become radical enough to warrant a MAF increase.
Older MAF's, you could measure the voltage. 5V being max.
Probably easier, but not necessarily cheaper (IDK) to go aftermarket MAF once intake, injector, porting, cam etc... changes become radical enough to warrant a MAF increase.
Last edited by Biotex; Jun 5, 2014 at 04:02 PM. Reason: spelling
Safety Car
Joined: Aug 2011
Posts: 4,451
Likes: 410
From: Portland OR
He has the larger AMF MAF thing.
You would log the car with HPTuners or similar and read the freq and airflow directly.
The limit is 12 kHz. And that limit is set by the PCM.
I hit just a touch over 11 kHz. I'm at maybe 450 rwhp. Never been to a dyno. But have logged a couple hundred drag strip runs
Guys switch to the later card style MAF when the stocker runs out of airflow.
Good luck with those Oregon pushrods.
Ron
You would log the car with HPTuners or similar and read the freq and airflow directly.
The limit is 12 kHz. And that limit is set by the PCM.
I hit just a touch over 11 kHz. I'm at maybe 450 rwhp. Never been to a dyno. But have logged a couple hundred drag strip runs
Guys switch to the later card style MAF when the stocker runs out of airflow.
Good luck with those Oregon pushrods.
Ron
Last edited by RonSSNova; Jun 6, 2014 at 03:25 AM.
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