done compression test today....not good....(with pics)
10-04-2005, 06:07 PM
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done compression test today....not good....(with pics)
right.... 
compression results are..
50
50
130
70
soooooo.....we took the head, etc off to see the revealed FOOOOOKED piston...
and all we got was this...
4 pistons....with no DET marks, no scouring on bores, no nothing...smooth as silk!!!!
sooo.....whats next?!?! RINGS we recon!!!
oh...and the turbo!!
compression results are..
50
50
130
70
soooooo.....we took the head, etc off to see the revealed FOOOOOKED piston...
and all we got was this...
4 pistons....with no DET marks, no scouring on bores, no nothing...smooth as silk!!!!
sooo.....whats next?!?! RINGS we recon!!!
oh...and the turbo!!
10-04-2005, 06:12 PM
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Originally Posted by Phil
Are you sure you did the compression test right??
ask Max...he was the one that did it...all be it a little hung over!!
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10-04-2005, 06:17 PM
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You normally do the compression test 'dry' - as is. Then you can do it again 'wet' by putting a small amount of fresh oil or Redex down the bores (via plugholes) - if the figures vary between the two tests, it'll possibly give you a clue to the problem.
http://www.pumaracing.co.uk/comp.htm have a read of that too.
If any cylinders are low then a "wet" test can be done. This involves squirting a few ccs of oil into the cylinder and repeating the test. The oil will help seal bad rings and increase the reading but won't affect it if the problem lies in the valves or head gasket. Copyright David Baker and Puma Race Engines
10-04-2005, 06:20 PM
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Originally Posted by Billabong
You normally do the compression test 'dry' - as is. Then you can do it again 'wet' by putting a small amount of fresh oil or Redex down the bores (via plugholes) - if the figures vary between the two tests, it'll possibly give you a clue to the problem.
http://www.pumaracing.co.uk/comp.htm have a read of that too.
http://www.pumaracing.co.uk/comp.htm have a read of that too.
made no difference
10-04-2005, 06:23 PM
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Originally Posted by Billabong
That would suggest it isn't the rings then........
Valves all seating properly, headgasket condition?
Valves all seating properly, headgasket condition?
10-04-2005, 06:29 PM
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Sorry to hijack, but you say theres no det marks? what do they look like?
dont forget you can test the valves are seating properly by putting some suitable liquid down the ports
dont forget you can test the valves are seating properly by putting some suitable liquid down the ports
10-04-2005, 06:43 PM
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Originally Posted by RST_lee
Whats the story behind it keith.
10-04-2005, 06:47 PM
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10-04-2005, 06:53 PM
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http://pack-square.business-php.com/...ucked&l4=keith
this is what they are hopelessly trying to say
so tell me what det looks like!
this is what they are hopelessly trying to say
so tell me what det looks like!
10-04-2005, 06:58 PM
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Originally Posted by digita1dragon
http://pack-square.business-php.com/?l1=your&l2=car%27s&l3=fucked&l4=keith
this is what they are hopelessly trying to say
so tell me what det looks like!
this is what they are hopelessly trying to say
so tell me what det looks like!
i THINK det looks like little pits in the top of the piston.....btu not sure...but it ain;t all smooth!!
10-04-2005, 07:13 PM
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Keith have you also turned the bottom over now the head is off and check the height of the pistons. that way you can check for a bent rod (in your engine that is 
boy)
Keith here goes my theory so dont laugh :
If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
boy)Keith here goes my theory so dont laugh
:If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
10-04-2005, 07:17 PM
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Originally Posted by AndyRST
Keith have you also turned the bottom over now the head is off and check the height of the pistons. that way you can check for a bent rod (in your engine that is boy)
boy)
Originally Posted by AndyRST
Keith here goes my theory so dont laugh :
If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
:If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
I took apart my old XR engine last week and one piston had loads of tiny tiny dents in the top. My only explaination for this was det, but Ive not seen it before.
10-04-2005, 07:19 PM
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take the pistons out and you will probably find that they have cracked between the rings this happend on one of my old turbos
they look ok from top but when taken out they were all cracked
they look ok from top but when taken out they were all cracked
10-04-2005, 07:21 PM
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Was just thinking exactly the same thing about the tappets, I've had it before where the cams actually worn through the bottom of the tappet causing zero compression on that cylinder
10-04-2005, 07:22 PM
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Originally Posted by digita1dragon
How would that affect compression exactly? the tappets arent holding the valves closed, they open them
I took apart my old XR engine last week and one piston had loads of tiny tiny dents in the top. My only explaination for this was det, but Ive not seen it before.
I took apart my old XR engine last week and one piston had loads of tiny tiny dents in the top. My only explaination for this was det, but Ive not seen it before.
10-04-2005, 07:27 PM
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Originally Posted by digita1dragon
Originally Posted by AndyRST
Keith have you also turned the bottom over now the head is off and check the height of the pistons. that way you can check for a bent rod (in your engine that is boy)
boy)
Originally Posted by AndyRST
Keith here goes my theory so dont laugh :
If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
:If your turbo has been leaking oil and run you out of oil the cam could wear heavily and knock the tips of the lobes off and kill the hydrolic tappets.
what everyone reckon ?
10-04-2005, 07:33 PM
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Originally Posted by steviep
Was just thinking exactly the same thing about the tappets, I've had it before where the cams actually worn through the bottom of the tappet causing zero compression on that cylinder
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