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Author Compression Test
Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
14th Mar 05 at 19:50   View User's Profile U2U Member Reply With Quote
How do i do one of these? what equipment will i need?
myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 19:55   View User's Profile U2U Member Reply With Quote
compression test gauge.
take all plugs out.
screw gauge into first plug hole, disconnect fuel pump and main coil lead.
turn over for ten seconds or untill the gauge stops increasing (will pump up more with each revolution till it peaks).
note down figure and move onto next pot.

after doing all four, drop a teaspoon ish worth of oil down each cylinder and repeat the test.
Drew
Banned
Registered: 24th Nov 01
Location: County Durham
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14th Mar 05 at 19:55   View User's Profile U2U Member Reply With Quote
compression tester....


disconnect the coil power so no spark is getting to the plugs

remove a spark plug, fit the compression tester, turn over engine (will say on instructions how many times, think mine said with accel pedal down fully)

record result

remove comp tester and refit spark plug

do the same for the next 3 plugs

Drew
Banned
Registered: 24th Nov 01
Location: County Durham
User status: Offline
14th Mar 05 at 19:56   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by myke
compression test gauge.
take all plugs out.
screw gauge into first plug hole, disconnect fuel pump and main coil lead.
turn over for ten seconds or untill the gauge stops increasing (will pump up more with each revolution till it peaks).
note down figure and move onto next pot.

after doing all four, drop a teaspoon ish worth of oil down each cylinder and repeat the test.


you wont have any compression with all plugs removed

[Edited on 14-03-2005 by Drew]
myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 19:58   View User's Profile U2U Member Reply With Quote
you will as the test gauge is blocking the only opening.
it wont give accurate readings if you only do one at a time.

remove pump relay to disable fuel.
Drew
Banned
Registered: 24th Nov 01
Location: County Durham
User status: Offline
14th Mar 05 at 20:01   View User's Profile U2U Member Reply With Quote
just read u do remove all - i never have and its worked fine, and insturctions i got with mine said remove 1 at a time
Drew
Banned
Registered: 24th Nov 01
Location: County Durham
User status: Offline
14th Mar 05 at 20:02   View User's Profile U2U Member Reply With Quote
http://www.popularmechanics.com/automotive/sub_care_clinic/1271886.html

ps - theres a link
myke
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Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 20:02   View User's Profile U2U Member Reply With Quote
but the cylinders are independant of each other.
you want to measure how much pressure each one can hold on it's own, not how much that one and the next one can hold comulatively.
Drew
Banned
Registered: 24th Nov 01
Location: County Durham
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14th Mar 05 at 20:03   View User's Profile U2U Member Reply With Quote
Drew
Banned
Registered: 24th Nov 01
Location: County Durham
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14th Mar 05 at 20:04   View User's Profile U2U Member Reply With Quote
u didnt mention opening throttle fully - so thats 1-1
myke
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Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 20:07   View User's Profile U2U Member Reply With Quote


Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
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14th Mar 05 at 20:11   View User's Profile U2U Member Reply With Quote
cheers guys i had a compression tester somewhere but gawd knows where it is

Myke come see me with yours and we can go for a drink after
ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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14th Mar 05 at 20:21   View User's Profile U2U Member Reply With Quote
doesnt matter if you remove one plug or all as long as you do them all the same!
myke
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Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 20:48   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by M15T XE
cheers guys i had a compression tester somewhere but gawd knows where it is

Myke come see me with yours and we can go for a drink after



sounds like a plan
you finished it yet?
Mistamist
Member
Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
14th Mar 05 at 22:42   View User's Profile U2U Member Reply With Quote
just gotta change these shafts, havent had the time or the transport to get up to shinee's but hopefully gonna get up there sometime this week.
myke
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Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 22:53   View User's Profile U2U Member Reply With Quote
you not got the mazda then?
Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
14th Mar 05 at 23:11   View User's Profile U2U Member Reply With Quote
yeah only got it friday, dont get paid till thursday so no petrol money at the moment. runs pretty sweet, apart from it blowing from the manifold - front box join, sounds like a ferarri at about 5000 revs. and a V8 at idle lol
myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
14th Mar 05 at 23:16   View User's Profile U2U Member Reply With Quote
bonus

 
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