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Triumph Torque    Cars    Herald/Vitesse  ›  Cam timing
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PhilS
November 5, 2017, 8:07pm Report to Moderator
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Hi.  New to the forum having bought our first Herald a few months ago.  Just trying to check valve timing .... With piston 1 at tdc, the gaps at valves 7 & 8 are 10 thou ..... So equal, and I think that is good? So I dont understand why online advice is saying I need to increase those gaps before I check they are equal???  Thanks.  
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glang
November 5, 2017, 10:54pm Report to Moderator

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I prefer the '9 method' but if you have no1 at TDC and the dizzy rotor pointing to no 4 lead then 7, 8, 4 and 6 should all measure 10 thou. Then rotating crank
360 deg all the others should also measure 10 thou. Dont know what youve been reading on line.........
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Nick Jones
November 5, 2017, 11:04pm Report to Moderator

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Quoted from PhilS
So I dont understand why online advice is saying I need to increase those gaps before I check they are equal???  Thanks.  


Because normally, with 1 at TDC, the valves on 4 will be "rocking" and will not have any clearances at all when the tappets are correctly set at the normal running setting of 10 thou.

If I remember right the suggestion is to set the tappet gaps to 40 thou using the normal rule of nines method, which does give you a gap of about 10 thou in the rocking position.  What are your tappet gaps when measured in the normal way (ie valve 8 measured when valve 1 is full open, and valve 7 when valve 2 is fully open)?

And yes, equal is good and shows the cam timing is right, assuming standard, symmetrical cam grind.

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
November 6, 2017, 9:26am Report to Moderator


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Confusion here.

The OP is checking cam timing, for which "Equal lift on Overlap" is used, as Nick describes.

The "Rule of Nine" (for a four-cylinder, 13 for a six) is used when setting valve to rocker gaps.

John


Serial Vitesse racer.

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

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glang
November 6, 2017, 10:08am Report to Moderator

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Thanks John, now it makes sense! Can the same cam timing technique be applied to sixes?
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JohnD
November 6, 2017, 4:17pm Report to Moderator


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Yes.
ELOO will work for any engine that uses symmetrical cams.   Which is most that are not very exotic, or have variable valve timing!

John


Serial Vitesse racer.

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

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Gt6s
November 11, 2017, 11:01am Report to Moderator


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Overlap at TDC. The easy way !!!!

Laurence


I remember being wrong once before Laurence Cochrane Newtownards Northern Ireland. 1972 Gt6 2600EFI The Mutt. Some original parts fitted, Not many ! Early PI motor overbored to 2.6. Lightened & balanced, ported chambered, cam'd 6-3-1 manifold. Running on DTA engine management system incorperating the PI throttle bodies fitted with electronic injectors and throttle position sensor. 0-60 4.7s & 7000rpm. Seriously annoys owners of modern stuff ! (particularly coz its a heap) 2500 S box with competition 28% od. 3.63 diff with a quaife in it, innit ! Rotoflex based rear but with a swing spring fitted & sliding shafts.(swing spring rotoflex without rotoflex's). Koni's front Spax rear. Hydraulic handbrake. Citroen xantia discs 11,1/4 in dia under Morris Garages 15 in Maestro alloys.
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