- from 850 owners manual
Ticking and Smoking After Leaky Injector Install
-
Sommerfeldt
- Posts: 1148
- Joined: 29 July 2008
- Year and Model: 2018 S90 T8
- Location: Oslo Area, Norway
- Has thanked: 55 times
- Been thanked: 42 times
Okay - there’s also a qualifier there, right? Like... “if the car has not been used for a long time...”?
It also says any ticking should only last a few seconds - like I said.
- S
It also says any ticking should only last a few seconds - like I said.
- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
-
Sommerfeldt
- Posts: 1148
- Joined: 29 July 2008
- Year and Model: 2018 S90 T8
- Location: Oslo Area, Norway
- Has thanked: 55 times
- Been thanked: 42 times
How’d you figure that?
If you just try and calculate a static value with 13.5:1, that should get you up around 290 psi, not 198. It’s impossible, of course, and that’s why you get a “normal range”. 219 seems about right for a normal max.
- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
-
erikv11
- Posts: 11800
- Joined: 25 July 2009
- Year and Model: 850, V70, S60R, XC70
- Location: Iowa
- Has thanked: 292 times
- Been thanked: 765 times
NA does, by about 40 PSI
I've done a lot of compression tests on P80 NA cars, the healthy ones come back 200-210 PSI per cylinder. The less healthy ones at 190-200. And for the cylinder that had a broken valve spring, zero psi.
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6
153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6
153kgone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
-
tardcart
- Posts: 410
- Joined: 8 February 2019
- Year and Model: 96 850t. 93 940t
- Location: Pittstown Nj
- Has thanked: 3 times
- Been thanked: 37 times
at sea level its comp ratio(13.5) x atmospheric pressure 14.7lbs/sq/in=198psi.
I consider that Volvo is running a grocery getter at 13.5 comp. ratio an engineering feat. and on regular gas.
I cant see how that is possible. its should detonate and diesel.
I consider that Volvo is running a grocery getter at 13.5 comp. ratio an engineering feat. and on regular gas.
I cant see how that is possible. its should detonate and diesel.
-
mrbrian200
- Posts: 1554
- Joined: 20 January 2016
- Year and Model: 2006 S60 2.5T FWD
- Location: Northern Indiana/Chicago
- Has thanked: 7 times
- Been thanked: 84 times
I so wish to be helpful on this one. Considered and thrown out several things...typing in, then deleting without posting...no it couldn't be that....no that doesn't help...
This is the one thing I can think that hasn't been discussed yet, and might be helpful:
Is it possible you might have a leaky/damaged injector O-ring, or corrosion or damage of the cylinder bore that the injector(s) go into is preventing a good seal? As the engine warms up the the metal expands altering the diameter of the hole slightly and the o-rings become somewhat softer/pliable to conform better to an imperfect or damaged bore or damaged o-ring that no longer fits perfect, between the two (heat and pliability) the leak seals up and a lean condition (and the tick) disappears.
Could a small leak at an o-ring, maybe not necessarily enough to make the cylinder dramatically lean, disturb the injector spray pattern enough to cause 'unbalanced combustion' ...think along the lines of gasoline direct injection running in 'lean mode' where the fuel mix within the cylinder isn't evenly distributed across the air withing the cylinder. With an 'uncontrolled distribution' as such I could imagine knocking/ticking/pinging to be a plausible effect. Most air leaks we are accustomed to dealing with are upstream - not right up within millimeters of the intake valves.
This is the one thing I can think that hasn't been discussed yet, and might be helpful:
Is it possible you might have a leaky/damaged injector O-ring, or corrosion or damage of the cylinder bore that the injector(s) go into is preventing a good seal? As the engine warms up the the metal expands altering the diameter of the hole slightly and the o-rings become somewhat softer/pliable to conform better to an imperfect or damaged bore or damaged o-ring that no longer fits perfect, between the two (heat and pliability) the leak seals up and a lean condition (and the tick) disappears.
Could a small leak at an o-ring, maybe not necessarily enough to make the cylinder dramatically lean, disturb the injector spray pattern enough to cause 'unbalanced combustion' ...think along the lines of gasoline direct injection running in 'lean mode' where the fuel mix within the cylinder isn't evenly distributed across the air withing the cylinder. With an 'uncontrolled distribution' as such I could imagine knocking/ticking/pinging to be a plausible effect. Most air leaks we are accustomed to dealing with are upstream - not right up within millimeters of the intake valves.
Last edited by mrbrian200 on 18 Apr 2019, 20:16, edited 1 time in total.
-
RickHaleParker
- Posts: 7129
- Joined: 25 May 2015
- Year and Model: See Signature below.
- Location: Kansas
- Has thanked: 8 times
- Been thanked: 958 times
Which hat did you pull 13.5 out of? The highest compression ratio of any Volvo modular engine is 10.7:1.
Your equation does not take in to account the temperature increases due to the rapid compression of a gas, in according with the laws of thermodynamics. The increase in temperature does push the pressure higher then your equation calculates. A compression ratio lower then 13.5 would produce 198 PSI at a barometric pressure of 14.7 PSI.
Last edited by RickHaleParker on 18 Apr 2019, 19:38, edited 1 time in total.
⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
-
Sommerfeldt
- Posts: 1148
- Joined: 29 July 2008
- Year and Model: 2018 S90 T8
- Location: Oslo Area, Norway
- Has thanked: 55 times
- Been thanked: 42 times
There are gasoline engines with higher compression than that.
Anyway, shouldn’t it be
(Compression-1^1.2)pressure? And then you have to factor in temperature, etc. Even cam positions. So you’re never going to get a static number.
- S
2018 S90 T8 Inscription - glossy black with amber interior and dark as night rear windows.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
[Gone] '96 855 T5 - R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
[Sold] '97 S70 T5
[Gone] '95 855 T5-R - one of the black ones... sadly stolen and wrecked.
-
abscate
- MVS Moderator
- Posts: 35267
- Joined: 17 February 2013
- Year and Model: 99: V70s S70s,05 V70
- Location: Port Jefferson Long Island NY
- Has thanked: 1497 times
- Been thanked: 3809 times
I think all turbos have the same CR? This is from my 99 HPT
Specifications
NOTE: Measure compression with the engine hot and at wide open throttle
Normal value B5234T and B5254T: 1.1-1.3 MPa (156-185 psi)
Maximum deviation between cylinders: 0.2 MPa (28.4 psi)
NOTE: This applies when the engine is warm and the throttle fully open and the engine being turned by the starter motor at 4.2-5.0 rps (250-300 rpm).
Specifications
NOTE: Measure compression with the engine hot and at wide open throttle
Normal value B5234T and B5254T: 1.1-1.3 MPa (156-185 psi)
Maximum deviation between cylinders: 0.2 MPa (28.4 psi)
NOTE: This applies when the engine is warm and the throttle fully open and the engine being turned by the starter motor at 4.2-5.0 rps (250-300 rpm).
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
-
- Similar Topics
- Replies
- Views
- Last post
-
- 15 Replies
- 6554 Views
-
Last post by sjanssen15
-
- 34 Replies
- 7448 Views
-
Last post by vtl