um depends what you are after!
So what's better, Tuning the A-Series Engine or How to Modify Your Mini, both by David Vizard??
the tuning the a-series is just about the engines - tells you modifications (but doesnt go anywhere into detail about good engine building)
the how to modify your mini, covers other areas of the car (but not engines in great detail)
both are really old now, and things have moved on a lot, but both are a worthwhile read..
I would like to address the line ' both are old now ------ etc'
My big 'A' series book, although some 11 years since it's last update, will still show you how to build a normally aspirated mini that will, at standard weight, go zero to 100 in 14 seconds. Let us see how many pro engine builders have the know-how to do that today let alone 15 years or more ago. Sure there are some out there but they are far and few between and most certainly will not tell you how to do it. The reason I have not bothered to update the big yellow book is that the industry at large has little more to offer that is not already in that book.
The only place I see where possibly some updates are needed is where parts I talk about are no longer available.
If you do not have the info to make over 100 hp per litre from a 5 port A Series then good luck trying to find the info anywhere else other than in this book.
I was reading your 'how to modify your mini' book 2 nights ago at 1 in the morning because I got so interested, the section on the suspension has helped me so much in the understanding of under-steer and over-steer.
I also agree,no matter how old the book is, people are still reverting back to it today because the information is so helpful and true, the design of the classic mini hasn't changed (with exceptions of the injection minis) although the differences are very minor so regardless of how old the book, even in 100 years time if minis are still around the books will still provide helpful information.
Modern day mechanics, with some exceptions dont seem to have the know how of engine mechanics, whether it be upgrading or repairing and diagnosing, they seem to be electricians rather than mechanics, its good that we still have people like you David and other skilled engineers/ mechanics who still know the ins and outs of how engines work rather than just the electronics of them, so if it were not for David's books alot of us would be pretty stuck!