Magazines:  Real Estate Shopping: Adult Costumes  |  Kids Costumes  |  Car Books  |  Guitars |  Electronics
This Issue Archived Articles Blog About Us Contact Us
SEARCH


Response

Some of this week's Letters to AutoSpeed!

Click on pics to view larger images


 

Butterfly Catching

You have an article on your site Butterfly Effect - "Active Exhaust Systems' latest electronically-controlled exhaust butterfly..." How can I get more information on this valve and a price for it?

Wayne
USA

Contact Active Exhaust Systems Australia at kevindavis@exemail.com.au or HyperFlow Technologies at http://www.hyperflow.com.au/

Airflow Data

Click for larger image

Do you know of any electronic products that show intake airflow in cfm, etc?

Luke
Australia

There is a variety of ECU reading software that will give you engine airflow data - assuming you own a relatively late-model vehicle. For more details, check out Reading Your Car's Brain - Part 1 and Reading Your Car's Brain - Part 2

More on EWPs

A newspaper appeared last week stating that Davies Craig has won a contract to supply electric water pumps to the manufacturer of the forthcoming Connaught GT coupe in Britain. Apparently, there will be several more production cars with these Davies Craig pumps fitted as OEM due over the next twelve months. BMW already uses an EWP in its 3-litre engines, but Davies Craig believes that it breaches their patents.

Are you able to offer us readers a brief rundown on what happened when you tested the EWPs? Surely there must have been some positive points - otherwise why would car manufacturers pursue the R & D into it? Perhaps see if you can do an article on retro-fitting a BMW unit?

Trevor Ng
Australia

We have not had any more experiences with EWPs since our original article in 2000 (Testing the Davies Craig Electric Water Pump - Part 1) and we are unable to present any of our test data.

Re Electric PS Search

In reference to your "Response" column this week - Response. There was a query about electric power steering. I know that 1989 model Suzuki Alto Works I.E. have a setup that looks very similar to the picture. Cars equipped with this feature have a ‘power steering’ sticker on the rear hatch glass, a control box under the driver’s seat and a heavily different loom to non power steer cars

Daniel Griffiths
Australia

Some Extra Nuts and Bolts Info

Click for larger image

I've just read your article All You Need to Know About Nuts & Bolts... It was generally a very informative article, however I did notice a few omissions that might require some clarification. I run the mechanical engineering department in the company I work for and thought I might throw in 2c...

You have gone to some trouble to describe the differences between the imperial fasteners "grades" yet you only mention metric "class" 8.8 steel fasteners. Metric fasteners are generally available in class 4.6 - a lower tensile strength grade. Class 8.8 fasteners are commonly available and are regarded as the lowest grade acceptable for structural applications. Class 10.9 is also available as the high tensile variant. As can be noted from the table in your article, class 8.8 is quite different to imperial grade 8 - the numbers must not be confused in structural applications!

It is worth noting that some types of fasteners are only available in certain classes - for example, socket head shoulder screws from quality manufacturers (such as James Glenn and Unbrako) are typically class 10.9 only. Likewise, you didn't identify preferred sizes. I recall in a recent article Julian noted that he was forced to rework because he chose to use M8 x 1.0 rather than M8 x 1.25 fasteners.

Technical drawing books such as "Technical Drawing" by A.W. Boundy, or "Technical Drawing - General Principles (as 1100.101-1992)" released by SAI have tables detailing which metric thread sizes are preferred within Australia.

In general, unless it is required for engineering or functional purposes, *never* use fine pitch threads as it will be very difficult to obtain fasteners. Sizes that are commonly used in general mechanical engineering include M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75, M16 x 2.0. M7, M14 and M18 are generally not used.

BTW, if you are not already aware, the best global repository for all information on threads is "Machinery's Handbook".  This covers everything from Metric to UNC, UNF, Whitworth, Acme and even Panzer thread information.

Adam Seedsman
Australia

Link Problem

In All You Need to Know About Nuts & Bolts, the links for the imperial and metric thread gauges point to the same place. I want the metric one, please.

Patrick Berry
Australia

Thanks for that - problem now fixed.

Love the Lamp

Click for larger image

Re the Zero Cost High Tech Interior Lamp...

Thanks for yet another great idea - it's often the little stuff like this that keeps me more than happy with the value of my subscription...

Although, I did not actually use my old scanner to make an interior light, your article made me realise I could quite easily gut, rewire, and transform my scanner into a light box for viewing slides and negatives, etc. (I'm mostly done, I just need to figure out how to frost the glass.)

In use, the scanner lamp throws out a really nice light - it has me itching to raid some second-hand stores in search of more old scanners as I can think of several more things I'd like to make with them. I'm currently thinking a compact portable work light - perfect when working under the dash and there isn’t enough room for the usual oversized auto lamp.

The only thing I came across with my lamp that differed from yours was that, when using it with a mains powered DC pack, my light wanted the full 24 volt 500ma supply from the original scanner - anything less gave a very dull light.

Kerry Novak
Australia

Excessive Drivetrain Loss?

In relation to the article of the 3.0-litre turbo Supra engine - 7MG Mega Motor!...

The power at the wheels is stated as being 570hp. The flywheel figure is quoted as being calculated at 850hp (or even closer to 900hp). Surely, the car would not be losing 280+ horsepower through the drivetrain?

Fergus O' Connell
Ireland

The old fashioned auto trans would be responsible for a sizeable percentage power loss but, equally, the car is difficult to run on the chassis dyno due to tyre slippage – so the 280+ hp loss is an estimate based on these factors.

 

Did you enjoy this article?

Please consider supporting AutoSpeed with a small contribution. More Info...


Share this Article: 

More of our most popular articles.
Finding the best place to put an engine cold air intake

DIY Tech Features - 10 July, 2001

Siting Cold Air Intakes

All the detail on how direct petrol injection systems work

Technical Features - 3 January, 2007

Direct Petrol Injection

One of the all-time great aero specials

Special Features - 10 January, 2007

Holden Commodore VL SS Group A Walkinshaw

Using a prebuilt DIY electronic module to flash high intensity LEDs

DIY Tech Features - 14 July, 2008

Bike LED Lighting Power!

Where turbos are heading

Technical Features - 20 July, 2007

New Tech Turbocharging

The most amazing flying machines you've ever seen

Smart Technology - 5 March, 2002

Between the Wind and the Waves: Ekranoplans

A revolutionary fuel-saving device that works

DIY Tech Features - 18 August, 2009

FuelSmart, Part 1

Igor Sikorsky's brainchild

Technical Features - 18 May, 2010

The First Helicopter

Is it time for a new direction in car modification?

Special Features - 13 May, 2008

Where to From Here?

The aerodynamic development of Mercedes large sedans from the 1950s to the 1990s

Technical Features - 6 May, 2014

Aero Timeline

Copyright © 1996-2018 Web Publications Pty Limited. All Rights ReservedRSS|Privacy policy|Advertise
Consulting Services: Magento Experts|Technologies : Magento Extensions|ReadytoShip