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Jaguar valve springs on a TR6


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There have been suggestions in the past about using Jaguar EBC 4871 valve springs as a replacement for Triumph on a TR 6.

I bought a set some time ago and intend to try them on my 72 (single valve spring) TR6 using a spare head that I have just had work done on.

The Jag valve springs seem a little longer than the ones fitted originally to the head. However I have no idea if the springs that came with the head were correct.

Does anyone have experience of using the Jag springs for a road car? What should the correct height of a single spring for 72 configuration be? I have been thinking that if there is increased height in the Jag spring then maybe the lower spacer should be omitted as advocated by Moss when using their uprated valve spring set.

Any thoughts please gentlemen?

PS. PLEASE -Anyone got a spare single valve spring lower spacer as one of mine went missing between my garage and the machine shop!! ( And are going to Stoneleigh? !!!)

 

MARK

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Mark,

 

I rebuilt my whole engine unit last year. It was made very plain to me by 2 engine tuners and 1 engine machine shop tuner that: Do not use any heavier valve springs than a TR5,because of the weakness in cam followers and cam lobes on the Triumph 6 cyl. engines. This is a very well covered subject on this Forum, regarding failures!

 

Bruce.

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I believe the info re the use of the Jag AJ6 valve springs came from Forums in USA but I remember speaking to a guy who had a stall at the I.W. at Malvern a few years ago who does tuning work on Jag and Triumph cylinder heads who was advocating their use on a TR6.

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@Mark

If you google that part no. They come up on various sites including club triumph. They are most probably unobtainable now but some of the specialist jag dealers may have them.

I had them on a list I made up some time ago as a possible alternative because of the poor quality of some of the bits we get from the usual suspects.

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@Mark

An old chap I knew worked for Lex Mead in Maidenhead when it was a leyland dealer, told me they were a suitable alternate as they were stronger. However with today's camshafts and followers maybe it's not such a good idea!

Googling the part shows up on other sites ....Club Triumph for example.

He also told me about the number of times they used to check the cranks for T/W wear and quite routinely replace them on customers cars..... hence my interest in them also.

Another little gem he swore by Vandervell bearings, so I had great fun in tracking down some sets!

Good to support a local company.....long since gone. They had a factory IIRC on the slough trading estate.

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  • 2 weeks later...

EBC 4871 worked well on Jaguars . . . . .

 

personally I wouldn't put them near a TR6 head, especially considering where the theory of using them appears to have originally sprung from.

 

Caveat emptor . . . . .

 

Cheers

 

Alec

And just whats wrong wid where they come from,

lots of folk ev used em , and as far as im aware, no have reported owt amiss with them,

 

Spill the beans, whats up if the bloke woe said to use them

if he was trying to help folk stop ruining their cams, thru ..others valve springs being too stiff.!!

 

M

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Read between the lines.....GT but no 6....

By the way, last week I finally got Moss to admit, after some fifteen years of denials, that they HAD altered the spec of the almost universally used TT1207 valve springs. Yes, made them stiffer (& more prone to coil binding).

I am fairly sure these have been responsible for spates of cam & follower failures.

Stiffness increases with the fourth power of the material diameter & it doen't take a genius to figure that a mere 10% increase leads to a 46% stiffer spring.

The same applies to anti-roll bars, but that's a whole other story.

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Standpartmanpartwolf,

 

I unfortunately see this another case of our main spares suppliers not having proper know how and quality systems in place. I complained to the Register about this sort of thing 20+ years ago and still have the correspondence. Needless to say nothing was done! I re-built my whole power unit last October and was warned by 3 engine re- builders/tuners do not use any valve springs heavier than TR5 and only use nitrided cam followers from Newman. This seems to back up your case?? But I also had the saga of being supplied with a soft lay shaft which roger Williams warned about in his book of 2002 and it was still going on in 2016????

 

I hope you have referred this matter to the TR Register QA Team?

 

Bruce.

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And just whats wrong wid where they come from,

lots of folk ev used em , and as far as im aware, no have reported owt amiss with them,

 

Spill the beans, whats up if the bloke woe said to use them

if he was trying to help folk stop ruining their cams, thru ..others valve springs being too stiff.!!

 

M

Hi Mate

Do you know how the jag spring specs compare with tr 6 valve springs? What springs did you use on your 2,5 GT6?

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I did,nt bung em in, as thowt they too stiff

 

I bunged in Ford CVH springs and seals,top hats

thees are slightly softer than the Jags, and are wider too

 

the jag,ns compressed the OE type moer when bunged into vice an tightened up back to back

the CVH ones wer aboot the same as OE

 

Butt need the full caboodle,, springs, seat base,, thee,s include a top hat oil seal, and top retainer,

yer OE collets fit thou !!

and also, the outer edges of the top spring retainer needs chmferred

like OE, as the ford,ns are 90deg, so catch ont under side oft rocker arm

see pic, fun this oot after wards !!

 

If ye no got a lathe, and time t,fart aboot, then just go OE.

 

http://www.ebay.co.uk/itm/Ford-CVH-Engine-Valve-Springs-/272588868321?hash=item3f77900ae1:g:7m4AAOxyHt9R01rJ

 

http://www.ebay.co.uk/itm/FORD-CVH-FIESTA-ESCORT-ORION-RS-TURBO-1-1-1-3-1-4-1-6-1-8-VALVE-STEM-OIL-SEALS-/140427514069?hash=item20b221d0d5:m:m9_BU5avtiPD2vX1PDxqExw

 

http://www.ebay.co.uk/itm/Genuine-Ford-Escort-95-01-Tappet-Valve-spring-retainer-1033901-/112328140290?hash=item1a27476602:g:z9YAAOSw9IpX0ecQ

 

and got some inner springs frae the local ford dealer, as a freebe, as they wer skoping em oot

 

see pic of em, note, outer springs no on, as just setting rocker contact on thee,s pics

wid soft inner spring, no got a full pic of both on

M

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post-12368-0-47595700-1489872742_thumb.jpg

Edited by GT6M
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