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Gordo takes over the Peter Mac Build.


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#221 gav240z

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Posted 11 April 2016 - 09:22 PM

That was awesome, who built the engine in Tom's car?



#222 TomC18

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Posted 12 April 2016 - 07:17 AM

Steve Newing did the last rebuild - originally built by Stan Holmes with Neil Cartledge machining special bits...  I am down a bit on power as it was detuned to run on 98, but still goes ok and revs cleanly to 8300.  i will try to work out how to load a video link too, as it sounds great :)



#223 260DET

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Posted 12 April 2016 - 08:51 AM

Oh man, what a great video  ;D  Noticed that Tom was doing some later apexes, nice driving both of you.



#224 PeterAllen

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Posted 12 April 2016 - 10:20 AM

It is the 100th running of the Indianapolis 500 next month and I'm following an interesting thread about some of its history. Here is the text from a few of posts which are relevant to this discussion:

 

- "Peter Revson qualified for the pole in 1971 at record speeds. His time would not have been quick enough to qualify for the 1972 race."

 

- "Were the rule changes or was just the development that fast in that time?"

 

- "USAC allowed wings for the first time, so the wedge shaped cars of 1971 were now replaced with cars that had massive rear wings. I believe they were much slower in terms of top speed along the straights, but obviously gained enormously in the turns."


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#225 luvemfast

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Posted 13 April 2016 - 12:32 PM

Its basically a father son race here.

When Peter was building the 260Z, it was based on Neil's 240Z.

So this is literally the best!



#226 Gordo

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Posted 23 April 2016 - 04:22 PM

Hi Guys. My last few posts have been about aero and drag on the zed at the race track. After a few tests with wings and splitters of and on I've decided to lower the rear wing hight buy 55mm. It was slightly higher then the roof line, and now is about 40mm below.
Also I've cut 80mm off each end of the wing.
The reason is to try the wing a bit lower and narrower might reduce drag a little .
I'm sure this will not effect the rear handling of the car as it was very stable, almost over winged. If there is such a thing.
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#227 PZG302

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Posted 23 April 2016 - 04:35 PM

Yes, yes that is a thing.....

 

Very easy to put too big a wing on a car.

 

Also if you the mechanical grip right you can get away with less wing and aero and therefor a bit less drag.


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#228 260DET

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Posted 23 April 2016 - 05:42 PM

Interesting Gordo, interesting, similar thoughts here. Rather than fit the u-beaut twin element wing sitting in the shed, I'm looking at relying on the existing bobtail rear spoiler but with a modest Gurney attached. They are quite efficient downforce as to drag.

 

Keep us up to date how yours goes.


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#229 Gordo

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Posted 23 April 2016 - 05:45 PM

So cut the wing up right down and re drill holes.
Cut 80mm off each end of wing.

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#230 Gordo

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Posted 25 July 2016 - 10:11 PM

I'm going to try a flat bottom zed, anyone done it?

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#231 luvemfast

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Posted 26 July 2016 - 07:22 AM

Don't know if it'll work, but I like it!  >:D



#232 260DET

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Posted 26 July 2016 - 08:46 AM

Gordo = Aero King :) Seeing that PI is your playground then it's certainly worth a try, what plans for ducting to provide air cooling for the transmission?  NACA ducts may work.


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#233 Sirpent

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Posted 26 July 2016 - 01:26 PM

Impressive Gordo ;)

 

May want to see if you can fit 1980's style F1 skirts which they killed off because it created to much downforce.



#234 Gordo

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Posted 26 July 2016 - 05:37 PM

I've been running with these side skirts, can't go much lower, as they will drag on the ground. But I have thought about running slim brush edges so it will sweep the road.

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#235 Sirpent

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Posted 26 July 2016 - 07:15 PM

Yeah sorry mate, I didn’t explain myself, many many years ago as I am sure you will remember, but many wont because they weren't even born yet, F1's FIA banned skirts that actually closed the gap to the ground and technically floated and were known as sliding skirts

 

This almost doubled the down force on the 1982 cars, and while negotiating corners at even higher speeds due to these skirts, Gilles Villeneuve was killed at the Zolder GP in Belgium when he made contact with another vehicle at high speed which broke the down force effect resulting in a drastic increase in air pressure.

 

The car went airborne summersaulted and catapulted him out of the car and into a fence with his helmet in close pursuit.

 

I remember watching the race live, it was horrific.

 

The crash........

 

http://www.dailymoti...es-villene_auto

 

And the skirts close up in the attachment

 

 

 

 

 

 

 

 

 

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#236 Howdy

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Posted 26 July 2016 - 07:16 PM

Don't know if it'll work, but I like it!  >:D

Damn straight it'll work, the test is to lick the bottom and stick it to your forehead. Awesome job Gordo, looks like a fair bit of work. What did you cover up the Z shaped hole in your shed with? 



#237 luvemfast

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Posted 27 July 2016 - 07:55 AM

 But I have thought about running slim brush edges so it will sweep the road.

Fastest street sweeper in all the land  ;D



#238 Sirpent

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Posted 27 July 2016 - 09:06 AM

Fastest street sweeper in all the land  ;D

 

Not as far fetched an idea as it may seem actually !



#239 JonMortensen

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Posted 27 July 2016 - 09:53 AM

Been lurking on this thread for a while, now I have a few questions to ask.

 

Looking at doing a flat bottom on my Z as well. Was discussing it on another forum and people seemed to think the grade of aluminum was pretty important. They were saying use a 6061 or better. 6061 would run about $500US, but 7075 was actually a lot cheaper, so that was the way I was planning to go. What did you use, how has it worked out?

 

Also see you did a front diffuser with the flat bottom, like a GTP car. Did you try without the front diffuser first, and did adding the front diffuser make any noticeable improvement?



#240 Cozza

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Posted 27 July 2016 - 04:54 PM

I can't comment on the ally grade to use as there are many unknowns. But something to consider when choosing is fatigue.
Ally is susceptible to fatigue which is normally a concern with high number of repetitions. Fatigue may be an issue as the ally sheet is likely to buffet under the car due to "galloping" forces. This is when the wind pressure acts on top then below the element momentarily, causing vibration up and down.
The area likely to fatigue will be close to the fixings. Spacing of fixings will play a part in the natural frequency / vibration and worth considering.

Cheers
Mick




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