barkerwilliams
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Posts posted by barkerwilliams
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Alan, I suspect that we are kindred spirits - wanting to understand.
Understanding adds something,,,its difficult to explain..but Richard Feynman gets close:
Peter,
Brevity is a virtue so:-
Yes. Yes and yes.
Alan.
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Peter,
Very many thanks for your answer, you have made an old man very happy.
Alan
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Peter,
I found this very interesting and enlightening. Might I please ask a combustion question I have often pondered.
Combustion results in a conversion into a number of product gases that occupy a larger volume at atmospheric pressure than the original air / fuel mixture exerting an increased pressure in the combustion chamber.
As the combustion is exothermic those gases are heated and expand and exert an even greater pressure in the combustion chamber.
My question is what proportion of the power of an engine is related to the conversion of the AF mixture and what proportion is related to the expansion of the products of combustion by the heat.
Apologies for my simplistic grammar.
Alan
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As a newcomer to the club I am surprised by these comments. I am from the IT industry where rates of £600 per delegate per day plus vat are the norm.
£50 per delegate day seems absolutely terrific value.
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Had my tr6 head done over Christmas at H T Howard, Slough. look at their website and the work they do. First class job, and done within a week if you take out the Christmas holidays.
Telephone them and have a word, their engineers take the time to talk with you.
http://www.hthoward.co.uk/about-us/company-history/
I am not associated with them in any way, just a happy customer
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Is there room to drill small hole tight to bracket to reach the detached captive nut, then mig weld nut to panel through the hole, unscrew bolt against the now welded nut, then drill second hole other side of nut and weld there to retain the nut with a second fixing?
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I too would be interested in these. Two of my injector pipes have rubbed the underside of the bonnet, and have bonnet paint on the injector pipe. It is not a problem now, but I would not like a perforated fuel line above the exhaust manifold so I was thinking of something like these clips to hold the pipes closer to the rocker cover, away from the bonnet. So if anyone knows of a useful part I would be happy to hear from them.
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Is the smoke for giving period TR odours for one-up-man-ship on the concours?
That last little percent of realism.
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bodies etc currently £51, but a little grim looking/
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A supplier is:
http://www.autosparks.co.uk/product_info.php?products_id=4471
All the TR looms, and any customised extra bits.
- I'm not connected to them.
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...and you are driving past the door of the Schlumpf Collection museum in Mulhouse, a real must, must, must see.
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If you are trashing the old pump why not give this a try?
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John,
Could not agree more with your post. I started this thread because I do not understand what supply is needed for the rocker shaft. there is mention of roll pins in the external feed pipe, or other restrictors such as proposed above. But there seems to be no target supply to aim for. The internal camshaft supply pulses oil to the rocker shaft for perhaps 60 degrees of camshaft rotation, crudely this is about 1/6th of the oil supply from the external additional pipe and furthermore it will always pulse oil at the same point in camshaft revolution when one or two valves are working their hardest - the rest of the valves will have to take their chance on the reservoir effect of the rocker shaft and feed pipes. The original design is more or less (depending on who you believe) good enough for the rockers. So why is the additional pipe capable of delivering 6 or more times that quantity of oil? There may be additional flow from the external pipe due to pipe diameter considerations.
So I was asking if a camshaft manufacturer had adjusted the camshaft to increase the rocker oil feed so that an external pipe would not be needed. But it seems not.
TR owners seems split between leave it original, and fit the external pipe, I would like to be a little bit better informed before I commit permanently .
I am now fabricating a fitting to measure the oil pressure (second temporary gauge) at the head bolt where the second pipe attaches together with a needle valve in the external additional oil pipe. I can then measure the "original pressure" with the pipe shut off and then all points to full bore on the external pipe. In the workshop with the rocker cover off perhaps I can determine what appears to be a good supply to the rockers and measure that pressure. I will then probably leave the needle valve in the external oil pipe.
It might lead nowhere but I am trying to proceed on the basis of some sort of factual results.
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Reading all the contributors above and many other similar topics there seems to be a general consensus that the additional rocker feed pipe delivers too much oil, and that the original design, whilst effective on an engine in good condition probably supplies only just enough to the rockers, not quite enough if upgraded to roller rockers.
Is there any information out there on what any rocker assembly needs in any other make or type of engine, is it 10ml per thousand revs, or 1 litre per thousand revs?
Contributors above suggest that a modification to the camshaft would be relatively easy and could be engineered to produce any particular oil flow required, if only there was an oil flow target to aim for.
Most oil flow in an engine is cooling, just a percentage for lubrication, is the rocker problem one of cooling, or lubrication?
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John,
Yes we need the loan of a block, a scrap camshaft we can file down and a Black & Decker to spin the shaft and we could experiment on flow rates - and then goodbye external pipe.
Alan
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Andreas,
many thanks for your answer. Yes I now have roller rockers, hence the oil pipe. But there is so much controversy whether an external pipe is needed, or even damaging to the lower engine. As I am vaguely planning a bottom end rebuild I was wondering if a cam manufacturer had improved the feed up to the rocker shaft.
From your answer that would seem to be very easy to achieve on a camshaft swap. Not as easy as fitting the external pipe though; so I presume the external pipe is for expediency when swapping rockers.
Alan
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I have an external oil pipe, but as the original rocker oil feed is governed by the spiral in the camshaft rear journal I wondered if any manufacturer had improved the throughput of this journal.
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There are many differing camshaft profiles available for a new shaft, but does any new make or style of camshaft offer improved rocker shaft oil flow?
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If you cannot find an original idle air valve then internet search for "needle valve bass" you will find something suitable.
Where a possibly suitable valve is < £15. You could either thread the throttle body to take the valve or file down/of the threads of the new valve to about 0.48" when it will push fit like the original.
Generic cooling
in General TR Technical
Posted
Is viscous fan allowed?