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Old 06 Nov 2003, 11:30 am
'Curly Q. Links'
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Default ___ compression test with weak battery - CRV

I did a compression test on a '97 CRV the other day. 70,000 km. (I'm
thinking of buying it)

The engine was warmed up, but because of a very weak battery I think the
compression test may be invalid. With PSI values of 85, 85, 80, 85, I
think I wasted my time. We made sure it 'pumped' six times for each
cylinder.

Anybody know what are the compression test values for the original CRV's
are supposed to be? Thanks.



'Curly'
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Old 06 Nov 2003, 03:42 pm
NetSock
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Default Re: ___ compression test with weak battery - CRV

"'Curly Q. Links'" <motsco_@_interbaun.com> wrote in message
news:3FAA851C.298EB389@_interbaun.com...
> I did a compression test on a '97 CRV the other day. 70,000 km. (I'm
> thinking of buying it)
>
> The engine was warmed up, but because of a very weak battery I think the
> compression test may be invalid.


A warm engine WILL give a slightly lower PSI value on a compression test.
Most manuals give specs for cold.

> With PSI values of 85, 85, 80, 85, I
> think I wasted my time.


Well...if it is worn, its worn evenly...which also indicates no individual
cylinder/piston/head/valve problem.

Find the "cold" specs and get a good battery.

>We made sure it 'pumped' six times for each
> cylinder.


No need to go any more than two...it wont affect the reading(s).


--
'03 S2000
'94 Accord

It's just about going fast...that's all...

http://home.insight.rr.com/cgreen/


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Old 06 Nov 2003, 06:38 pm
Eric
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Default Re: ___ compression test with weak battery - CRV

"'Curly Q. Links'" wrote:
>
> I did a compression test on a '97 CRV the other day. 70,000 km. (I'm
> thinking of buying it)
>
> The engine was warmed up, but because of a very weak battery I think the
> compression test may be invalid. With PSI values of 85, 85, 80, 85, I
> think I wasted my time. We made sure it 'pumped' six times for each
> cylinder.
>
> Anybody know what are the compression test values for the original CRV's
> are supposed to be? Thanks.
>
> 'Curly'


Most of the Honda motors that I'm familiar with have compression specs in
the 170-185 range. Make sure that you have the throttle wide open when
you're doing the test. This will help achieve maximum air flow. You can
also put a small battery charger on the unit to give it a little extra boost
if the battery is weak (or use jumper cables connected to a good battery).
I believe the rpm spec for the compression test is 250 rpm.

Eric
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  #4 (permalink)  
Old 08 Nov 2003, 05:12 am
Ricky Spartacus
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Default Re: ___ compression test with weak battery - CRV

Bought a car with 165, 162, 163, 164, and was not acceptable. It runs
but not acceptable. Bought another with 184, 185, 186, 182 and was
acceptable.

Try a leak down test?
Rick

> I did a compression test on a '97 CRV the other day. 70,000 km. (I'm
> thinking of buying it)
>
> The engine was warmed up, but because of a very weak battery I think the
> compression test may be invalid. With PSI values of 85, 85, 80, 85, I
> think I wasted my time. We made sure it 'pumped' six times for each
> cylinder.
>
> Anybody know what are the compression test values for the original CRV's
> are supposed to be? Thanks.
>
>
>
> 'Curly'

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