Compression Check

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Feb 10, 2004 | 12:57 AM

#11

BigTurbo74

Senior Member

Joined: Jul 2002

Posts: 2,315

you shouldn't have coolant in oil, moisture will build up if the engine has sat for a while. do a coolant pressure test to check the waterseals as well

Feb 10, 2004 | 04:38 AM

#12

RETed

Senior Member

Joined: Nov 2002

Posts: 925

From: Honolulu, Hawaii USA

Actually, Mazda uses the trailing position versus the leading.

Also, Mazda numbers apply to engines that are warmed up, not cold.

Although not explicitly mentioned, you need to prop the throttle open.

I just wrote up a page for this...

http://fc3spro.com/TECH/FAQ/compress.html

-Ted

Feb 10, 2004 | 04:38 PM

#13

BigTurbo74

Senior Member

Joined: Jul 2002

Posts: 2,315

is this technique the same for s4 and 5 (trailing instead of leading)

Feb 10, 2004 | 05:13 PM

#14

Nemesis

Senior Member

Joined: Mar 2003

Posts: 1,535

From: ATX

Quote:

Originally Posted by RETed' date='Feb 10 2004, 04:38 AM

I'm glad to see the site is back up.

Feb 10, 2004 | 06:57 PM

#15

RETed

Senior Member

Joined: Nov 2002

Posts: 925

From: Honolulu, Hawaii USA

Quote:

Originally Posted by BigTurbo74' date='Feb 10 2004, 02:38 PM

is this technique the same for s4 and 5 (trailing instead of leading)

This applies to all Mazda rotary engines.

-Ted

Apr 21, 2005 | 08:18 PM

#16

fc3s4utnv

Senior Member

Joined: Jan 2005

Posts: 831

From: Greenwood AR

I wouldnt do the "quick way" for this find your self a dealer or a rotary shop that has a Mazda Compression checker.

We did mine and it looked good but the car still ran like crap. Went to the dealer had them do it with the factory tool and then we knew why it ran like crap.