Engine RPM

TBP

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Jan 23, 2006

#1

• Jan 23, 2006

• #1

Is there a way of determining engine RPM without a Tach?

 

HistoricMustang

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Apr 11, 2003

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Jan 23, 2006

#2

• Jan 23, 2006

• #2

s-code said:

Is there a way of determining engine RPM without a Tach?

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When it stops pulling you are in the 5800 to 6200 RPM range, depending on the set up.

HistoricMustang
www.historicmustang.com

 

Edbert

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Jul 13, 2002

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Jan 23, 2006

#3

• Jan 23, 2006

• #3

If you know your rear gear ratio, tire size, and have an accurate speedometer it can be calculated.

 

wild70stang

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#4

• Jan 23, 2006

• #4

There are like 5 million dwell meters on ebay for cheap and some are brand new.

 

Jester67

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Jan 23, 2006

#5

• Jan 23, 2006

• #5

Get a friend that is or use to be a sonar teck for the Navy. I had a friend in collage that could stand near a car and tell you the rpm’s to plus or minus 50 rpm as measured with an optical tach. On every car we tried it on. Damndest thing I ever saw.

 

LMan

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Jan 23, 2006

#6

• Jan 23, 2006

• #6

Yes. When it explodes, you are at redline + 500 rpm.

 

HistoricMustang

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Jan 24, 2006

#7

• Jan 24, 2006

• #7

LMan said:

Yes. When it explodes, you are at redline + 500 rpm.

Click to expand...

Yea, that is kinda how I torque my bolts - tighten 'till they strip and then back off half a turn.

HistoricMustang
www.historicmustang.com

 

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TBP

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Jan 24, 2006

#8

• Jan 24, 2006

• #8

So, I need a dwell meter, an ex sonar tach, and just run it till it blows. Sounds like fun.

 

wild70stang

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Nov 11, 2005

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Jan 24, 2006

#9

• Jan 24, 2006

• #9

you could just floor it and hold the gas pedle down till the exhaust manifold turns red. At least you knew it could make it that far without pinging ::

 

krash kendall

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Jan 24, 2006

#10

• Jan 24, 2006

• #10

Are you still trying to set your idle?

 

wild70stang

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#11

• Jan 24, 2006

• #11

I hope to god that S-code isnt. I on the other hand just bought a vacuum gauge last night on ebay for $10 .

 

TBP

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Jan 24, 2006

#12

• Jan 24, 2006

• #12

krash kendall said:

Are you still trying to set your idle?

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I think I have the idle set where it needs to be. I wanted to be able to verify the engine RPM since my tach doesn't currently work. I picked up an engine analyzer on the way home tonight that will show me the engine RPM.