Low Compression :: Triumph Torque

RH Classic Insurance

Welcome, Guest.
Please login or register.
Low Compression
Forum Login
Login Name: Create a new account
Password:     Forgot password

Triumph Torque    Chit Chat Boards    Technical Chit-Chat  ›  Low Compression
Users Browsing Forum
No Members and 3 Guests

Low Compression Print
4 Pages 1 2 3 4 » All Recommend Thread
Matt306
October 7, 2017, 4:16pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
My little four pot (which i will swap out for a six cylinder sometime next year/year after/maybe year after that) seems to have developed a little lack of power.

I have done the tappets to get a little stiff pull on the tappets when feeding in 10thou feeler and pulling back.

I did a cold pressure test and got 150/90/150/150 psi on the pistons. I know its meant to be done warm so went for a drive and run again and the offending chamber has now risen to 100 psi.

Not noticing any coolant leak but would like to sort the problem. Most obvious is remove the head and have a look but is there anything i can look at prior to that


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message
Nick Jones
October 7, 2017, 5:04pm Report to Moderator

Club Member
Posts: 9,931
Posts Per Day: 2.21
the 150 psi is probably about right for the engine.

Do a wet compression test next.  That is, put a tablespoonful of oil in each cylinder and repeat the test.  This oil provides additional ring sealing and helps determine whether you have a ring/bore issue or valve seating issue.  If it's a ring leak, adding the oil will give a bigger improvement than a valve issue.

Hopefully it's a poorly seating valve and fairly easy and cheap to resolve.

Leak down test is another option but involves slightly more elaborate equipment.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
Logged
Private Message Reply: 1 - 46
RedRooster
October 7, 2017, 6:34pm Report to Moderator


Posts: 1,352
Posts Per Day: 0.40
Check your water for oil & check your oil for water, if you can find some one with a block leak tester try that.


GT6 Mk3, the Rooster    https://www.youtube.com/watch?v=u8W1XSjFB6g  tune on the radio the first time it broke down, 5 miles after i bought it
http://www.triumph-club-de-fra.....estauration-dune-gt6  
Logged
Private Message Reply: 2 - 46
RedRooster
October 7, 2017, 6:34pm Report to Moderator


Posts: 1,352
Posts Per Day: 0.40
Check your water for oil & check your oil for water, if you can find some one with a block leak tester try that.



This post contains attachments; to download them you must login.



GT6 Mk3, the Rooster    https://www.youtube.com/watch?v=u8W1XSjFB6g  tune on the radio the first time it broke down, 5 miles after i bought it
http://www.triumph-club-de-fra.....estauration-dune-gt6  
Logged
Private Message Reply: 3 - 46
Matt306
October 7, 2017, 7:10pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
I'll stick some transmission oil down piston two and try that.
I had the sump off and the checked the rad, no sign of fluids being in the wrong place.


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message Reply: 4 - 46
Nick Jones
October 7, 2017, 9:04pm Report to Moderator

Club Member
Posts: 9,931
Posts Per Day: 2.21
Most likely the exhaust valve seat IMO.  That much compression missing going into the water jacket would cause a header tank like a jacuzzi and water everywhere.....

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
Logged
Private Message Reply: 5 - 46
TedTaylor
October 7, 2017, 11:09pm Report to Moderator

Club Member
Posts: 2,689
Posts Per Day: 0.93
Quoted from RedRooster
If you can find some one with a block leak tester try that.


Yep in the Forest of Dean

Not used it for 20 years and not sure about the fluid but could check that - it is only universal indicator liquid to test for pH (acidity/alkalinity)

MUT


Mad Uncle Ted!
Growing old is inevitable but growing up is optional.

AFH849B Mk1 2000 period rally replica (under restoration ..... again) First re-built 1991
NAM616G Morris 1800 London Sydney/Monte/World Cup (awaiting restoration)
SCG115G Mk1 PI estate
WDE 76K Mk2 2500 estate (Woodie) RBRR 2014   2016  
LSE Soft Dash Range Rover with Brooklands body kit on LPG (Still for sale)

From the depths of the Forest of Dean....
Logged
Private Message Reply: 6 - 46
Matt306
October 8, 2017, 3:10pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
Cheers all.
But some ep90 down the bored and all the compressions rose. From 150 to 250 or over on 1,3 and 4. Number 2 went up from 90 to 150 so a smaller rise so I am thinking valve stuck. I had the stems and new valves about 4000 miles ago . I guess it's head off time to grind in valve or is there an easier way. Or is my thinking to cock?


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message Reply: 7 - 46
JohnD
October 8, 2017, 3:59pm Report to Moderator


Posts: 6,794
Posts Per Day: 1.51
Thats misinterpreting the results.
Any rise = no valve problem
Only if the pressure does not rise can you diagnose a stuck or damaged valve.
The first will be obvious, running the engine with the valve cover off.

The reason why compression down on 2 isnt obvious.   Your numbers are so high compared to those usually got that I suspect a very sensitive gauge, so the absolute pressure in 2 may be so low as to suspect faulty piston or rings.
John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

Logged
Private Message Reply: 8 - 46
Matt306
October 8, 2017, 4:11pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
Either way it's head off time I guess? Going to up load a video to YouTube with her running see if u hear what I hear.


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message Reply: 9 - 46
Matt306
October 8, 2017, 4:14pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
Here's the you tube video.

https://youtu.be/zJaOxvrWlzw


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message Reply: 10 - 46
Matt306
October 8, 2017, 4:34pm Report to Moderator

Club Member
Posts: 770
Posts Per Day: 0.29
Couple more... Looking at the white smoke I am erring too piston ring. Which is blooming annoying as I only took the sump off two weeks ago.
https://youtu.be/8oKBVI5rjOU
https://youtu.be/Wk-AaGNxrJ8


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
Logged
Private Message Reply: 11 - 46
poppyman
October 8, 2017, 5:32pm Report to Moderator
Club Member
Posts: 296
Posts Per Day: 0.72
Sadly it does look like oil smoke
Logged
Private Message Reply: 12 - 46
daver clasper
October 8, 2017, 7:24pm Report to Moderator
Club Member
Posts: 435
Posts Per Day: 0.28
Hi

Are compression dry/wet tests a fool proof way of diagnosing ring/piston/bore or head wear or a good starting point, please.

Thanks, Dave  
Logged
Private Message Reply: 13 - 46
Nick Jones
October 8, 2017, 7:26pm Report to Moderator

Club Member
Posts: 9,931
Posts Per Day: 2.21
Good starting point.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
Logged
Private Message Reply: 14 - 46
4 Pages 1 2 3 4 » All Recommend Thread
Print

Triumph Torque    Chit Chat Boards    Technical Chit-Chat  ›  Low Compression

Thread Rating
There is currently no rating for this thread
 


Powered by E-Blah Forum Software 10.3.5 © 2001-2008

Latest Blogs-
Steve Weblin

09th December 2017 08:30am gmt
Merlyn Motors of Bristol - Triumph Car Dealers 11A
Club Triumph Round Britain Reliability Run

08th December 2017 3:51pm gmt
Reservists - a call to action!!
more blogs...
Next Group Meetings-
North London & Herts Monday 18th December 20:00
Glasgow Tuesday 19th December 20:00
Shropshire Wednesday 20th December 19:00
West Midlands - 2nd meeting Wednesday 20th December 20:00
Southern Area 2nd meeting Thursday 21st December 20:00
more local groups...
Upcoming Events-
more events...
For Sale-
Spitfire MKIV cylinder head, refurbed not used. Casting 312240, Stamp number 218142. Unleaded inserts, seats triple cut, new valves, guides and springs. Skimmed 0.040 inch. £300. Mob. 07764 860234 email: steve-karen.dee@ hotmail.co.uk
Pair of Stromberg CD 175 carburettors, linkage and mounting nuts. Removed from an American-spec TR6. Looking for £35. Based in Peterborough. Matt George on the forum or phone 07921 853482.
project colander aka 1973 1500tc dolomite - needs lots of welding but is largely complete though partly dismantled . contact dinger on the forum
more adverts...
CLUB TRIUMPH the Club for all Triumphs
© Club Triumph Ltd MCMXCVI - MMXV