i haven't tried yet, but i figure if my motor is fully assembled on a stand, i should be able to hand crank it and get readings? any compression test how to says you check your psi after you've turned the motor over a few times.

anyway just wondering, thanks for any info

 

I don't see why that wouldn't work....

 

alright cool. just wanted to see if i was overlooking anything.

thanks

 

Get ready to muscle it.

If you go to an engine shop you can find some plugs to jam in there that will only pop out at an acceptible amount of pressure

 

good luck trying to pump the engine manually.....lol

 

Hand cranking?

If you can bolt up a tranny and starter you could jump the starter. Your going to need a good 7-8 cranks to get a good reading.

 

hand cranking as in a socket on the crank bolt, attached to a ratchet or breaker bar, and turning it that way. should work right?

or am i having a moment

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxmastermindxx &raquo;</TD></TR><TR><TD CLASS="quote">hand cranking as in a socket on the crank bolt, attached to a ratchet or breaker bar, and turning it that way. should work right?

or am i having a moment</TD></TR></TABLE>

like i said, i hope you are strong.

it will help some if you take out all the plugs. but compressing one cylinder fast enough to raise the compression and have it hold before the air leaks out is not going to be an easy task. Maybe try getting a 1/2 impact gun.....

 

i see what you mean. i figured that the cylinder would hold the pressure, because it's a screw in tester. then again i know that most motors have small amounts of leakage, which is why we do leakdown tests.

anyway the real purpose of this was because i was debating replacing the rings or not. but since i'm doing all my bearings anyway, i guess i might as well throw new rings on too. it's an f22/h23 and i'm trying to stay as cheap as possible but some things SHOULD be done.

cool, thanks for the answers.

 

if you have access to an air compressor, you can do a leakdown test.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">Maybe try getting a 1/2 impact gun</TD></TR></TABLE>

Do you mean using an impact to turn the motor clockwise? Besides the fact that you'd be spinning it the wrong way, you would torque the **** out of the bolt and risk snapping it off.

 

Cranking an engine around by hand isn't as hard as some of you think, like I said, a lot of engine shops, my roommate's dad's shop included, use pressure plugs in the spark plug holes and a ratchet on the crank pulley to test engines.

You give it your all, the plugs pop out and POW if the compression is good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gogunkergorilla &raquo;</TD></TR><TR><TD CLASS="quote">Besides the fact that you'd be spinning it the wrong way</TD></TR></TABLE>

Spinning it the other way, as long as the transmission isn't on, is fine. Though I wouldn't do the impact gun thing either.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gogunkergorilla &raquo;</TD></TR><TR><TD CLASS="quote">

Do you mean using an impact to turn the motor clockwise? Besides the fact that you'd be spinning it the wrong way, you would torque the **** out of the bolt and risk snapping it off.</TD></TR></TABLE>

apparently you have never used an impact.......

there is a forward and reverse.....

 

The bolt would probably back out. You could weld a tool up to use the big hex hole in the crank pulley to a centered socket hole so you could use a gun on it, but that might be a waste of time...

 

you could theoretically hook up the starter and jump the terminals to crank it over

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">The bolt would probably back out. You could weld a tool up to use the big hex hole in the crank pulley to a centered socket hole so you could use a gun on it, but that might be a waste of time...</TD></TR></TABLE>

Exactly! we actually agree on something

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelude_h22vtec &raquo;</TD></TR><TR><TD CLASS="quote">you could theoretically hook up the starter and jump the terminals to crank it over</TD></TR></TABLE>

That would work, you'd have to bolt up the tranny though.

 

i dont think the impact would work. those things just arent that strong. cranking an engine takes a consistent torque. an impact gun just pulses torque. maybe it would work, but my logic says no.

 

better than trying to muscle it.....


forget the compression test, do a leak down.

more precise and offers more information.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gogunkergorilla &raquo;</TD></TR><TR><TD CLASS="quote">
we actually agree on something
</TD></TR></TABLE>

I guess I spoke too soon

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

Spinning it the other way, as long as the transmission isn't on, is fine. Though I wouldn't do the impact gun thing either.</TD></TR></TABLE>

That wouldn't be good because the oil pump would be pumping oil in the wrong direction. After a few turns there would be metal to metal contact. sorry

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">forget the compression test, do a leak down.

more precise and offers more information.</TD></TR></TABLE>

Exactly, although on a fresh build, you're going to have a ton of leak. IIRC, mine was close to 30% on the stand before the engine was ever started.