need help asap- testing compression s13 sr20det cranking ?s - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*handinpants* · 01-08-2009, 11:57 AM

I am testing the compression on my s13 sr20det, I want to know what the amount of full cranks i need to do to get an accurate reading. I am doing 5 cranks right now and got these readings. 145 -140-145-145 being the first reading is the pistion closest to the radiator.

please help because i need to know how many complete cranks i need to do to get the proper reading.

obsolete · 01-08-2009, 12:22 PM

5 cranks should be enough. should stop as soon as pressure stops going up.

Monooxide · 01-08-2009, 07:59 PM

Your compression is good, the main thing is to make sure the values are reasonably close to one another. Your readings could be low because of a crap gauge.

Previous poster is right, crank until the pressure stops going up.

*handinpants* · 01-09-2009, 11:24 AM

someone else told me this, i used a snapon guage though. my shop teacher says 5 cranks, but he's been building v8 hot rods for a while

*fliprayzin240sx* · 01-09-2009, 11:30 AM

5 cranks is enough...plus the number you got are pretty consistent for an SR20. If it lower than 125-130, then i'd start worrying.

01-08-2009, 11:57 AM	#1
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 38 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	need help asap- testing compression s13 sr20det cranking ?s I am testing the compression on my s13 sr20det, I want to know what the amount of full cranks i need to do to get an accurate reading. I am doing 5 cranks right now and got these readings. 145 -140-145-145 being the first reading is the pistion closest to the radiator. please help because i need to know how many complete cranks i need to do to get the proper reading. __________________

01-09-2009, 11:24 AM	#4
handinpants FreshColdBeer.com Join Date: Feb 2008 Location: California Age: 38 Posts: 2,665 Trader Rating: (48) Rides Gallery: handinpants Feedback Score: 48 reviews	someone else told me this, i used a snapon guage though. my shop teacher says 5 cranks, but he's been building v8 hot rods for a while __________________

01-09-2009, 11:30 AM	#5
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	5 cranks is enough...plus the number you got are pretty consistent for an SR20. If it lower than 125-130, then i'd start worrying. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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01-08-2009, 12:22 PM	#2
obsolete Zilvia Addict Join Date: Aug 2003 Location: NJ Age: 41 Posts: 717 Trader Rating: (8) Feedback Score: 8 reviews	5 cranks should be enough. should stop as soon as pressure stops going up.

01-08-2009, 07:59 PM	#3
Monooxide Zilvia Addict Join Date: Mar 2005 Location: Farmington/Flint, MI Age: 33 Posts: 675 Trader Rating: (8) Feedback Score: 8 reviews	Your compression is good, the main thing is to make sure the values are reasonably close to one another. Your readings could be low because of a crap gauge. Previous poster is right, crank until the pressure stops going up.