PRMW
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Posts posted by PRMW
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Thankyou all for your feedback. Your info John L that the double collar was to allow valve rotation makes me feel I will go with the double collars for all valves since it must be an advantage for all the valves to be able to rotate surely?? My engines are CF3156UE and CP75266HE with the CF being modified to PI spec by the chap who did the conversion LHD to RHD and set the car up for track use. So from what you are saying Derek the engines both would have been fitted with single valve springs. Since both now have double springs this was obviously changed over the years. I have new springs coming from Moss for the spare engine (CP) but can rob parts from it to set the CF up as best I can. It (CF) has new valves, new guides and seats, new rocker shaft and cam followers, new cam gears (vernier cam gear), 2 ring PI cam. So unless anyone can definitely advise against it I will assemble it up in the next days with all double collars, stepped washers, double springs. Thanks again folks and hope you are all able to stay safe over there. Regards Peter
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Hello all.
Many thanks for your replies and ideas. I am still uncertain whether there is anything preventing me from installing the exhaust valve double collar to all valves, thus replacing the single collar on the inlets. I will attach a photo showing how badly the inlets collets seat down into the single collar. As an engineer I find it hard to accept yet there has to be a reason why the Triumph designers settled on having a different setup for the inlet compared to the exhaust. The fact that both valves have double springs means binding could be an issue and one of the collars (the single) gives positive location for the small spring. But can you think of any reason why that would be more important on the inlets than the exhausts? Regarding the stepped washers which I will install they do give a preload to the small spring so have a dynamic effect as well as preventing wear on the head.
BTW incredible though it may seem, my two heads one fitted to a UK PI car and the other to a USA carb car, ended up with me in New Zealand and the serial numbers are only 2 digits apart, ie only one head in between the two in production!
Anyway I am near to assembly but want to try to clarify this first. If not I may have ot revert to the original set-up.
Regards Peter Wilson
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Hello AarhusTr6,
You may be interested in this GB for sale in New Zealand. Transport costs may not necessarily be huge.. Just a thought..
Regards
Peter Wilson, Whangarei New Zealand
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Hello.
I hope that I am not repeating an existing thread but searched for ages .. I am trying to ascertain the correct valve spring/ collar/ collet combination. I have two early PI engines for my late 72 TR6. Each engine had different collars between the Inlet valve (single piece collar) and the Exhaust valves (two piece collar). I have new valves (standard) and with the Inlet valves the collets do not fully insert into the Single piece collar, whereas the Exhaust valve collets sink down snugly into the two piece collars. I note that the single piece collar on the inlet does have a step to force alignment of the inner valve spring whereas the two piece does not. Is there any reason why I could not install the two piece collar system on all valves.
In addition I am unsure whether I should use the stepped washer under the springs as it was installed on one engine and not on the other.
Could someone please set me straight on this. I am in New Zealand and in the Register there but we have drawn a blank on this issue.
Thankyou in advance. Peter Wilson
TR6 Valve Collets
in TR6 Forum
Posted
Further photo which better shows the good seating of the exhaust collets and the poor seating of the inlets.