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Triumph Torque    Cars    Herald/Vitesse  ›  Vitesse  engine twin or single valve springs?
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Vitesse  engine twin or single valve springs? Print
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slate
August 20, 2017, 10:03pm Report to Moderator

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I am currently building  a Mk2 vitesse engine which has a 308778 cam and a 517528 head.
This head has single springs where all the parts lists I can find show the vitesse  having twin springs?
My question is do I have the wrong head or did they swop to single springs at some point ?
Or could it have been previously built using single instead of double springs?

The head also has a dab of yellow paint on it if that helps?




2000 auto-��(10cr 2005)[s] reborn as a 2500 mannual��o/d MK2 (RBRR 2008 ) ��� Mk2 Vitesse (10cr2007/2009)
Gatwick��Area organizer
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Nick Jones
August 21, 2017, 7:21am Report to Moderator

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It's the right head number for a Mk2 Vitesse, GT6 Mk2 and early Mk2 2000.  I would expect it to have double springs, but anything could have happened in the last 50 or so years.....

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
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JohnD
August 21, 2017, 10:05am Report to Moderator


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Its less a case of what you have, more what you want.

Double springs aren't for extra strength, by using two with different stiffnesses,  the frequency at which they will resonate is multiplied and the valve bounce inhibited in the rev range usable by the engine.   So if you intend to rev your engine,double spring it.     If you dont no need to change.

John


Serial Vitesse racer.

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

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slate
August 21, 2017, 12:56pm Report to Moderator

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Thanks for the replies

I was mainly concerned that what I have is correct and not a lash up, but as i'm  sure the engine has been reworked once already (020" Pistons & 010" crank ) and the head looks like it has unleaded seats (slightly proud on exhaust valves) albeit they are  somewhat burnt and pitted especially no 2 whose spring was upside down.

It appears that most engine Re-manufactures re-build to the latest spec which appears to be single spring and as iv'e no intention of going racing etc i think i will stick to standard specs.



2000 auto-��(10cr 2005)[s] reborn as a 2500 mannual��o/d MK2 (RBRR 2008 ) ��� Mk2 Vitesse (10cr2007/2009)
Gatwick��Area organizer
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RobPearce
August 22, 2017, 8:25am Report to Moderator

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My Vitesse also has single springs because the engine rebuilder who converted it to unleaded (for the previous owner) changed it over. The other (questionable) benefit of single springs is that they leave room for valve stem oil seals. But our cars don't really need them.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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JohnD
August 22, 2017, 8:43am Report to Moderator


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Valve spring?  Upside down?   You have progressive valve springs?  Definitely not standard!

John


Serial Vitesse racer.

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

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sparky_spit
August 22, 2017, 4:06pm Report to Moderator

Mike Banks
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Quoted from JohnD
Its less a case of what you have, more what you want.

Double springs aren't for extra strength, by using two with different stiffnesses,  the frequency at which they will resonate is multiplied and the valve bounce inhibited in the rev range usable by the engine.   So if you intend to rev your engine,double spring it.     If you dont no need to change.

John


John - on a rebuilt and balanced 1500 engine that's unlikely to go north of 5000/5500 rpm very often, I was planning on using single Jaguar springs. Do you reckon that rev limit is acceptable for single springs?


Location - North Essex

1968 MkIII Spitfire - 2009, 2013, 2015 10CR. 2009, 2010 Nachtrit. 2011, 2012, 2014, 2015, 2016, 2017 HCR (..and 11/14ths of the 2011 10CR)
Yamaha RS200 two stroke smoke machine.
Royal Enfield Bullet 500
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Steve P
August 22, 2017, 5:36pm Report to Moderator
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Single Jag springs in my 2.5 tuned up Vitesse.10,000 miles so far.
Steve


No. of Triumphs owned..2
No. of Triumphs working..2
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Martin M
August 23, 2017, 7:15am Report to Moderator


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Single Jag springs happy to rev above 6000 in the GT6    
Did someone try the Chris Witxxx double springs he offers for the TR5 type engine?

Martin
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