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Thursday, 16 July 2015 00:00

Performance Upgrades

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The best exhaust

Thursday, 16 July 2015 00:00

Never Too Safe

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The Good Oil on the Good Oil - A liquid tune up

Now I bet most of you would not associate giving the car an oil change with making it go faster – but it does, so let’s explain why.

When the engine is running, no moving parts actually touch any other, instead they are held apart by a very thin layer of oil. How thin you ask? Well let’s take the crankshaft as an example. Once the oil light goes out, the crank is actually floating on a layer of oil of somewhere between .01 and .03 millimetres thick. To give you an idea of how thick that is – the hair on your head is around .075 millimetres. So we are talking teensy, weensy clearances here.

Now this layer of oil we are talking about is also between the piston rings and the cylinder bore. Matter of fact, without this oil layer the engine probably wouldn’t start, because not only does the film stop the rings tearing themselves and the bore apart, it also seals the combustion gases in.

Engines with low compression are hard to start and have low power outputs because a lot of the pressure developed in the cylinder due to the burning fuel heating and expanding the air, leaks past the rings and into the sump.

Why this occurs is due to the dilution of the oil by water and petrol. The water is a natural by-product of the combustion process (you most likely have seen it running out the exhaust when the car is cold), and when the car is hot, it just vaporises during the combustion process. But when the car is cold, it condenses on the relatively cool parts of the head and cylinder walls and runs down past the rings into the sump. Same happens with the petrol. Not all of it is burnt when the engine is first started and because the oil is also not up to temperature and doing its job, some of the fuel ends up in the sump.

So over a period of time, your oil gets diluted and thinner. It then does not seal the cylinders as well and you lose power. Not to mention the extra wear that takes place on the engine.

So how often should it be changed? Well that depends on how you drive it. Your owner’s manual may suggest up to 15,000k between oil changes. If you are operating under extreme service conditions, those figures should be halved at least.

What’s extreme service?

  • Long periods of idling, such as in traffic.
  • Short runs where the engine does not get hot
  • High speed driving e.g. track based events
  • Towing heavy loads

The sort of things we do with our cars all the time. However the good news is that if you live in Melbourne and work in Perth, the long drives to work where the car is hot and running under reasonable load all the time will mean that 15,000k oil changes will be fine!

As stated if you are taking the car to the track this qualifies as an extreme service condition. You should aim to check and be prepared to change oil every 5,000kms. Check levels a day or two before you go to the track and at the end of the track day. It is always advisable to take a can of oil with you to the track. A 5 litre container of oil could save you $$$$.

OK, now we know that the manufacturers are telling us a bit of a porky, what’s a good distance? For normal driving 5000k is fine and only change the oil filter every second change because the oil won’t be as dirty in the first place, so the filter won’t have as much junk in it.

Which oil?

That's for our next article...come back soon.

Thursday, 16 July 2015 00:00

Driver Spotlight

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Petrina Astbury

Petrina is a fantastic asset as a long time volunteer and competitor to the MSCA. Petrina also helps motorsport via her work with the Women's arm of CAMS known as WAMS (Women of Australian Motorsport). See Petrina's WAMS profile here

You will probably know Petrina as the smiling person who helps you with your sign in procedure when you are checking in at an MSCA sprint event. However there is a lot more that she and her merry team of volunteers go through in addition to handling the challenges that come with processing on average over a 100 people at each meeting. Petrina also competes in the events in her trusty clubman and has a healthy competition with her father Nick (MSCA chief scrutineer) and her new hubby Bruce (MSCA treasurer). You could say her involvement in the MSCA is a family affair.

Petrina is also one of the founders of the fabulously popular CAMS sponsored Come and Try events which encourages newcomers to motorsport. This is a huge undertaking and lots of time has been invested in what has been recognized as the most popular deployment of this program across Australia. Always smiling and always in control Petrina knows how to organise and communicate which is just as well as her profession is in the People, Culture and learning field. She is a great facilitator and a keen competitor.

The MSCA has a great community spirit that comes from people such as Petrina and we owe them a lot of thanks for their great contribution, without which a lot would not be possible.

Next time you see that smiling face say hi and if you feel you would like to contribute in any way, whether it be with expertise in some motorsport related field, organizational, marketing or other ways just drop a line to This email address is being protected from spambots. You need JavaScript enabled to view it.