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Thread: Cheetah Mk7

  1. #1
    default title Old Major's Avatar
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    Cheetah Mk7






  2. #2
    Meh
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    Looks like a Toyota 2T engine?

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    Xb Gs 351

    Not a race car, but it does get on the circuit.




    http://www.youtube.com/watch?v=dmANu__8J60

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    default title Old Major's Avatar
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    Quote Originally Posted by Billzilla
    Looks like a Toyota 2T engine?
    Sure is. It's laid on it's side like Motor Improvements used to.

  5. #5
    default title Old Major's Avatar
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    I purchased the Cheetah last year after coming to the conclusion that trying to make a family car like my XB quick around the race track isn't a wise move.

    My race car is the last of seven mk7 Cheetahs made by Brian Shead to race in Australian Formula Two. Brian designed and constructed his Cheetahs in a small factory at the rear of his home in Mordialloc, Melbourne. All up Brian manufactured almost fifty Cheetahs. The mk7 was originally a ground effects car, running venturi like side pods to pull the car to the ground. During the mid 80's ground effects were banned and the car was converted to a flat bottom format. The side pods that are now on the car are off a Cheetah mk8. I have yet to put the car on scales, but Brian Shead said that the mk7s were the lightest of the Cheetahs. I have been informed that it weighs in under 400kg. In Australian Formula Two the race weight including driver is 510kg.

    The transaxle was made by Holinger Engineering. It uses a VW case and is similar to the five speed Hewland mk9, with most components being interchangeable, but the gear shift mechanism in the Holinger is considered superior to the Hewlands. The limited slip diff is a cam and pawl type.

    The engine in my car is a 1.6 L Toyota 2T. The 2T is basically a 4 cylinder hemi, but with an alloy head. The Toyota motor was considered to be stronger and cheaper to run than the VW Golf motors that it raced against, but it is was also down on power. That isn't to say that a 2T is not a powerful motor. A standard 3TC head flows 147/135cfm @ 0.400" lift & 28" H20. Ported they flow 190/155cfm @ 0.500" & 28" H20. A strong 2T can make 180hp and I have heard figures of up to 200hp quoted. 180hp in a 400kg car makes for a very good power to weight ratio. My car has run 1:08's at Mallala, so it's no slouch. For comparison the V8Supercar lap record is a 1:08.1, F3 is 1:06.4 and F4000 is 1:02.6

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    Registered User TK's Avatar
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    'The ghost' - Mark at sascar dosen't happen to fiddle with that does he?

    He often mumbles about a 2T powered jigger he fiddles with & brings in little bits of it for me to mess with.

    TK

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    default title Old Major's Avatar
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    The engine was built by Doug Veale at Cantech in SA. There are a lot of custom made parts in the motor.

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    gday have you got any photos of inside the cockpit of the cheeta by any chance? thats a fantastic car by the way.

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    Quote Originally Posted by PHULL View Post
    gday have you got any photos of inside the cockpit of the cheeta by any chance? thats a fantastic car by the way.
    I could take some photos. What areas are of particular interest?

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    the front bulkhead, centre bulkead ( of the monocoque section) with the dash

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    Front bulkhead is a plate. Top rear is RHS.
    ..

    Rear lower crossmember is RHS as is the centre crossmember that supports the springs.
    ....

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    fantastic stuff mate good photos

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    Moderator Cal's Avatar
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    Too cool. Thanks for posting.

    Cal.
    The most dangerous risk of all - the risk of spending your life not doing what you want, on the bet you can buy yourself the freedom to do it later. - Randy Komisar.

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    just out of interest where did you get the program for that?

  16. #16
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    Quote Originally Posted by PHULL View Post
    just out of interest where did you get the program for that?
    http://www.susprog.com/

  17. #17
    Prod Sports Racer CT's Avatar
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    Ahh, walnut glow xb gs fairmont...mine was walnut glow too....the memories!
    A slow day at the track is better than any day in the office.

  18. #18
    Carby Row Tree luvr edo's Avatar
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    Hey XB...cool.

    Where do you race it? What series?

    What would a bloke expect to pay for something like that?

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    default title Old Major's Avatar
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    At this stage I'm looking at running in OZ Boss and perhaps Australian Formula Two in NSW. It's starting to get pretty close to being back on the tarmac. In the long run I intend to return it to it's original form and race in Historics. ie return it to this:




    An Australian Formula Two will cost between $25k to $40K. Occasionally cheaper cars come on the market, but by the time they are up to scratch they are no cheaper. Here are a few on the market now:

    ASP
    http://www.my105.com/classified.asp?id=7512

    Cheetah mk7
    http://www.my105.com/classified.asp?id=6933

    Elfin 622, built when twincams were allowed.
    http://www.my105.com/classified.asp?id=7248

    Cheetah Mk6, sold a few years back
    http://www.race-cars.com/carsold/oth...6/af2mk6ss.htm
    http://www.race-cars.com/carsold/oth...6/af2mk6ss.htm
    Last edited by Old Major; 30-08-07 at 05:58 PM.

  20. #20
    Moderator Cal's Avatar
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    Quote Originally Posted by xbgs351 View Post
    A mate of mine who used to race a Formula 2 Kadaitcha sent me that link the other day. Was inspired to get back into it.

    Cal.
    The most dangerous risk of all - the risk of spending your life not doing what you want, on the bet you can buy yourself the freedom to do it later. - Randy Komisar.

  21. #21
    default title Old Major's Avatar
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    Quote Originally Posted by Cal View Post
    A mate of mine who used to race a Formula 2 Kadaitcha sent me that link the other day. Was inspired to get back into it.

    Cal.
    I have seen that car numerous times at historic meets and it looks very neat and tidy. Within Group Q/R the old AF2 cars are very close. Lately the ASP, a Birrana and a Hardman have had great battles.

    http://www.natsoft.com.au/cgi-bin/re...5/2007.WINT.P8
    http://www.natsoft.com.au/cgi-bin/re.../2007.WINT.R39

  22. #22
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    Took the car back to the tub last week. Here is a photo of the front of the engine:




    The front of the tub:




    And just how light is the tub? Well it happly sits on two pieces of styrene.

    Are you optimistic or pessimistic about the end of the world?

  23. #23
    Moderator Cal's Avatar
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    Have you been racing it since you last posted in August?
    The most dangerous risk of all - the risk of spending your life not doing what you want, on the bet you can buy yourself the freedom to do it later. - Randy Komisar.

  24. #24
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    Not yet. I pulled her apart to clean out the oil tank & deaeration tank and to get access to some hard to reach rivets. The oil tank had a little bit of sludge in it, but no foreign materials. Another mk7 owner lunched an engine from rubbish in the oil tank and I wasn't going to risk that happening.

    I got to drive yet another mk7 at Wakefield last year, but modern fuels had made the foam in the fuel cell rot and bits of foam where blocking up the fuel filter, so it didn't want to rev out.
    Are you optimistic or pessimistic about the end of the world?

  25. #25
    Gimme six Schlitzes Beavis's Avatar
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    Pardon my ignorance, but what's with the ridiculously narrow tires?

  26. #26
    Unregistered User Permit Roadsailing's Avatar
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    so you can push it around and get it onto trailers etc, racing tyres are wide, its done commonly with gokarts too.

    and for skidz

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    top stuff dude how do you find working with solid rivets. Also where do you guys get your nose cones from? no doubt someone in vic has moulds for them.
    Last edited by PHULL; 30-04-08 at 08:28 AM.

  28. #28
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    The transport wheels are also larger in diameter which makes the car easier to get onto the car trailer as this car is seriously low with the race wheels and tyres on. The narrower width of the transport wheels also creates a lot more room in the garage.

    Yet to have a go with the solid rivets. The nose cone is made the same way as the rest of the car being rivetted aluminium, with a hollow tube passing through it which the front wings slide over. Most of the mk7s ended up with the narrow nose cone, not sure where it originated from. The wings are made of some kind of foam and I don't know where they where manufactured.
    Are you optimistic or pessimistic about the end of the world?

  29. #29
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    sorry I was refering to the fibre glass nose full width nose cones that were also used before people started using proper wings

  30. #30
    default title Old Major's Avatar
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    Quote Originally Posted by PHULL View Post
    sorry I was refering to the fibre glass nose full width nose cones that were also used before people started using proper wings
    The original wings are also made of rivetted aluminium sheet.
    Are you optimistic or pessimistic about the end of the world?

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