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26-02-2006, 05:21 PM
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#1
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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Wanted........
Has anyone got a Mercury XR2 Compression Tester Kit for sale or know of were i can get one??
Many Thanks
Will C-24
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26-02-2006, 05:31 PM
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#2
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Registered User
Country: england
Location: the grim north
Occupation: robot
Cruising area: tyne
Join Date: Nov 2004
Location: the grim north
Posts: 915
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will a normal compression tester not do
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Speed costs weight so what do we cut off first 
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26-02-2006, 05:33 PM
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#3
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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Would prefer it to be the right one? but if a normal one is suitable and would work then yes. My knowledge of these is limited as you probably guessed.......
Will
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26-02-2006, 07:42 PM
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#4
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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just go to halfords dude, any compression tester will work whether it be for a car or boat.
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26-02-2006, 11:39 PM
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#5
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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Cheers for the info will do.........
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27-02-2006, 04:37 PM
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#6
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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What compression should it read on an XR2??
Cheers
Will C-24
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27-02-2006, 07:21 PM
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#7
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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not sure, guessing about 130psi but as i said not sure. are they all around the same figure dude cus thats just as important. You know you need to test at WOT don't you dude????
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27-02-2006, 07:34 PM
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#8
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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Could you explain WOT? Sorry obviously still got alot to learn....
Cheers
Will
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27-02-2006, 07:52 PM
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#9
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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Wide open throttle.
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27-02-2006, 07:56 PM
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#10
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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That did cross me mind, so do the compression test Wide Open Throttle.......???
Will
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27-02-2006, 08:01 PM
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#11
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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Yep
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27-02-2006, 08:02 PM
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#12
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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Don't foget to pull the kill switch
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27-02-2006, 08:38 PM
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#13
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Registered User
Join Date: Mar 2004
Posts: 6,891
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Just do the same for all cylinders - whether that's WOT or not,. although you should get a higher reading @ WOT.
All should be within 5% - ideally should all be exactly the same.
I've got a fairly decent one you can borrow if you like.
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28-02-2006, 01:17 AM
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#14
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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one plug at a time dude, post the results.
yes wide open throttle but as matt says if all the same what ever the test it should be ok
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28-02-2006, 12:57 PM
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#15
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hello
Join Date: Mar 2004
Posts: 2,739
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Quote:
Originally posted by Burty
one plug at a time dude, post the results.
yes wide open throttle but as matt says if all the same what ever the test it should be ok
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They should all be with in 5 to 10% of each other. Test it with the throttle wide open as if you dont the readings may all be within the 10% (even wear on all cylinders) but they could still all be low and you would never know as you would put the low readings down to the fact that the throttle is closed!!!
Think XR2's are around about 135PSI (WOT) when standard!!!
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01-03-2006, 08:35 AM
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#16
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Registered User
Country: England
Location: South West
Occupation: Development engineer
Interests: Fast boats
Boat name: Xtreme
Boat make: Bernico 21
Engines: Mercury F1, 300 Drag, XR2 "Fingerported"
Cruising area: South West
Join Date: Mar 2004
Location: South West
Posts: 1,043
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XR2 135 PSI
I have never had an XR2 read that low.
I would expect to see 145-155psi
Cyco
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01-03-2006, 08:52 AM
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#17
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Senior Member
Country: England
Location: Warsash
Occupation: Boat Designer
Interests: sport
Boat name: Santana
Join Date: Mar 2004
Location: Warsash
Posts: 1,838
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More like it - we used to expect 150 to 155.
Gap of no more than 5 psi bewteen highest and lowest compressions ideally - an absolute maximum difference of 10 psi, anymore and time for a strip down.
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01-03-2006, 12:27 PM
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#18
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Live for today, not 2moro
Country: United Kingdom
Location: South Coast
Occupation: Builder/Property Development
Interests: Racing
Boat name: Black Thunder
Boat make: Cougar
Engines: Rude 250HO
Cruising area: Solent/Anywhere
Join Date: Sep 2004
Location: South Coast
Posts: 382
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OK, i will aim to see about 150-155, and without a difference of no more than 5-10psi thoughout, all at Wide open thorttle......
Lovely job
Cheers
Will
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01-03-2006, 12:30 PM
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#19
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Registered User
Join Date: Mar 2004
Posts: 6,891
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You can "aim" for whatever you want.
What you see might be completely different!
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01-03-2006, 12:58 PM
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#20
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hello
Join Date: Mar 2004
Posts: 2,739
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Re: XR2 135 PSI
Quote:
Originally posted by Cyco
I have never had an XR2 read that low.
I would expect to see 145-155psi
Cyco
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I did say "I think its around....". I've never owned an XR2 and was just makeing a guess based on other mercury pump gas race motors.
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