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RE: "Block relief" - L.M. Williams book - Nick Lettington - 19-01-2019
Bob has a point though. There's a thin line between souping up the internals and ripping off the body to make a hemorrhoid. Where do you stop? If you want an Austin to keep up with traffic, get a frog or an A35. If you want vintage motoring, why then try to make it something else? When scrapyards were full of old cars and it was almost impossible for a young person to get anything else, all the modding made sense. Now I'm not so sure.
Rant over... I'm now off to relieve a block for my Speedex.
RE: "Block relief" - L.M. Williams book - Rogerfrench - 19-01-2019
I have hesitated before contributing further to this thread, but there's now plenty of meat to chew upon.
Relieving the block. The diagram is Bill Williams' book is poor, what is required is a smooth radius, as described by Holly Birkett in 1952, so that the incoming gas doesn't stop to rub its bum which gets scraped by the sharp edge. Or something like that, as my father wrote. Definitely a good modification.
Bowdenex brakes. There have been some efforts that have introduced more friction than they should. However, given large radius curves and good cables they work well. Simplicity was so equipped in 1957 and still has them today. I do concede that installing them in a standard production body has its challenges though.
Camshafts. It's interesting that Bob thinks the Williams idea won't work. It reminds me of the bumblebee, when expert aero engineers determined that with its weight, wing area and power it couldn't possibly fly. They forgot to tell the bee though! My father reground scores, if not hundreds, of camshafts in very similar fashion. Sure, the 50 thou grind went through the hardening, but the base circle is lightly loaded any way, and though his earlier shafts were chrome-plated to restore hardness, he seldom did with later shafts, particularly those with only 25 thou off.
Bill Williams' Book. There are so many errors in it that I wonder if he wrote it, or proof-read it. I guess not. He claims to be the inventor of Bowdenex braking then describes the action totally incorrectly. I have a copy annotated by my father (who, I must admit, publicly expressed his disapproval of Bill Williams) with barely a page without comment. It was written in 1958, well after much of the material had been published by the 750MC, written by Holly Birkett, Arthur Mallock, and many others including my father, with no acknowledgement.
As for it being the best of its kind, I guess Alan hasn't read Special Builder's Guide or the Austin Seven companion.
RE: "Block relief" - L.M. Williams book - Dave Mann - 19-01-2019
Our RN saloon with a bog standard engine keeps up with the traffic and a Merc owner accused me of accelerating!! I didn't realise a Seven accelerated I thought they gathered momentum.
RE: "Block relief" - L.M. Williams book - Paul N-M - 19-01-2019
(19-01-2019, 06:30 PM)Rogerfrench Wrote: I have hesitated before contributing further to this thread, but there's now plenty of meat to chew upon.I also hesitated to bring in JF and others names to the discussion as it seemed obvious that most of what was being asked has been addressed in the 750MC book. I had a JF cam and followers in my second seven special which I used for trials with a modded block with a decent radius into the bore just as the book suggests and it went very well. There is plenty of solid info there and plenty enough to make your 750 sv go as RF suggests.
Relieving the block. The diagram is Bill Williams' book is poor, what is required is a smooth radius, as described by Holly Birkett in 1952, so that the incoming gas doesn't stop to rub its bum which gets scraped by the sharp edge. Or something like that, as my father wrote. Definitely a good modification.
Bowdenex brakes. There have been some efforts that have introduced more friction than they should. However, given large radius curves and good cables they work well. Simplicity was so equipped in 1957 and still has them today. I do concede that installing them in a standard production body has its challenges though.
Camshafts. It's interesting that Bob thinks the Williams idea won't work. It reminds me of the bumblebee, when expert aero engineers determined that with its weight, wing area and power it couldn't possibly fly. They forgot to tell the bee though! My father reground scores, if not hundreds, of camshafts in very similar fashion. Sure, the 50 thou grind went through the hardening, but the base circle is lightly loaded any way, and though his earlier shafts were chrome-plated to restore hardness, he seldom did with later shafts, particularly those with only 25 thou off.
Bill Williams' Book. There are so many errors in it that I wonder if he wrote it, or proof-read it. I guess not. He claims to be the inventor of Bowdenex braking then describes the action totally incorrectly. I have a copy annotated by my father (who, I must admit, publicly expressed his disapproval of Bill Williams) with barely a page without comment. It was written in 1958, well after much of the material had been published by the 750MC, written by Holly Birkett, Arthur Mallock, and many others including my father, with no acknowledgement.
As for it being the best of its kind, I guess Alan hasn't read Special Builder's Guide or the Austin Seven companion.
Some have gone further and experimented with twin plug heads and removing material from behind the valves, something that was thought to be of no benefit to getting more mixture in and only lowering the c/r even more than that already lost in doing the block. However as with so many myths I seem to remember both mods together gave almost another 1000 rpm and the additional power that came with it.
As RF alludes to his fathers 'correspondence' via the bulletin with 'reader' Williams, it makes interesting reading!
Paul N-M
RE: "Block relief" - L.M. Williams book - Ruairidh Dunford - 19-01-2019
The new engine you have built Alastair is a wonderful piece of work Paul - very impressed, all beyond me.
RE: "Block relief" - L.M. Williams book - Alan - 19-01-2019
But, Roger, what good was the special builders guide? It was well out of print when I started in Austin Sevens and the Companion wasn’t written yet. Like I said, the Williams book was all there was and we shouldn’t dismiss it.
RE: "Block relief" - L.M. Williams book - JonE - 19-01-2019
your annotated copy, Roger, would be a fabulous thing to digitise for the public, for posterity.
RE: "Block relief" - L.M. Williams book - Steve Jones - 19-01-2019
My copy of Williams has been annotated in light pencil by a previous, unknown, owner. However, some of the annotations are incorrect!!
Steve
RE: "Block relief" - L.M. Williams book - Ruairidh Dunford - 19-01-2019
Penchant is personal by definition.
RE: "Block relief" - L.M. Williams book - Bob Culver - 19-01-2019
I do not claim that camshafts cannot be successfully reground. I did one on my RP car using my B and D drill and with no vertical slide. It was very successful for 3,000 miles when after a sustained 60 mph the crank wrecked it and much else.)
I just maintain that strictly as drawn in Williams not practicable. It would have required no more effort to depict it more accurately. (For any curious I will post home cam regrinding separately)
One major misleading item in Williams is the impossible advice on dynamo polarising. Many are already confounded by matters electric.