Author Topic: Rotus Project Build  (Read 40322 times)

Offline clive

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Re: Rotus Project Build
« Reply #900 on: December 09, 2019, 08:05:52 AM »
I think it will give the car more identity  :great:
All the best Clive

Offline Jamie R

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Re: Rotus Project Build
« Reply #901 on: December 09, 2019, 08:37:31 AM »
Certainly a nod to what’s under the bonnet if ya can’t tell


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Offline Casey

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Re: Rotus Project Build
« Reply #902 on: December 09, 2019, 04:02:48 PM »
Lol in a good way ? Or ya not convinced?
Good way - that's why a  :13:, - nice hint to what's underneath  :icon_thumleft:
RX-8 230 Bridgeported: Racing Brake Disks & 4 pot front calipers,Full Racing Beat (RB) SS Exhaust system,RB ARB's F & R,RB REVI intake,Tein MonoFlex Coilovers & front strut brace.
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Offline Jamie R

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Re: Rotus Project Build
« Reply #903 on: December 09, 2019, 06:36:34 PM »
It’s all annoying me now.

Got the basic shape, but I’m being really fussy about curvatures. Doing one side is easy. Getting the other half identical is a nightmare

It’s compound curves on 2 planes .

Imagine giving someone a 1 foot cube of polystyrene and a sanding block and say make a perfect sphere. With no flat spots ......

Grrrrr

And ive used £120 of body filler so far and another 30 quid tomorrow.

It makes great adhesive tho lol


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Offline Jamie R

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Re: Rotus Project Build
« Reply #904 on: December 10, 2019, 03:26:19 PM »


Xmas come early this year


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Offline clive

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Re: Rotus Project Build
« Reply #905 on: December 10, 2019, 05:28:07 PM »
I know you will do your homework on this one,  but I used this type of set up a year ago and abandoned it, because of a minor little detail, like I couldn't stop the car !.

Allegedly the set up was for an RX-8, however the pedal was absolutely rock hard which indicated to me that the master cylinders were too big.

Problem with the race car is I couldn't  just run it up n down the road to develop the system so out it went.

Like I said,  I know you will do your homework :great:

(In the old days, most used Hillman Imp Cylinders for these conversions)
All the best Clive

Offline Jamie R

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Re: Rotus Project Build
« Reply #906 on: December 10, 2019, 06:12:56 PM »
Welp,

This is a universal set up for anything really, due to space constraints I need the M/C's coming back into the cockpit to which there will be a heel plate over the top.

Interestingly, the M/C's that come with it as standard are 0.625" for the front and 0.75" for the rear. Funnily exactly the same I had for my red top powered Mk1 escort donkeys years ago on a homemade bias pedal box.

From what I remember the brakes were phenomenal on my escort with no servo. I was running Austin Princess 4 pots on front and sierra calipers on the rear.

I know a lot can do with bore sizes (area) of each caliper piston in comparison to how much fluid each M/C can move.

As a ratio between front and rear, I know the bore sizes of the M/C's are right but I havnt gone to deep in calculating the total area of pistons in comparison at this stage. But theres a simple formula I have from my days at college doing fluid dynamics to work that out.

As you rightly said, you dont have the luxury of road test shakedown, and need to drive in anger from the start.

I have the luxury or buying different bore sizes of M/Cs if need be. My gut feeling from experience, is it "should" be fine, or certainly as a starter for 10.

Ill let you know either way.

My biggest concern is floor mounted brake with top hung RX8 loud pedal.......... Ive never had the need to practice heel and toe braking and changing down on the road.

And at my driving abilty on the track ( or lack of) , Ill probably still not need it for several months/years.

I just hope the funny arrangement doesnt hinder the option.
Its just Rotors and GRP
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'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster

Offline clive

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Re: Rotus Project Build
« Reply #907 on: December 10, 2019, 09:01:39 PM »

I just hope the funny arrangement doesnt hinder the option.

I have faith in you grasshopper / nope to young to remember that then ;) 
All the best Clive

Offline Jamie R

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Re: Rotus Project Build
« Reply #908 on: December 10, 2019, 09:14:37 PM »
Lol nope it finished airing about 12 months before I was born
Its just Rotors and GRP
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'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster

Offline clive

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Re: Rotus Project Build
« Reply #909 on: December 10, 2019, 09:33:48 PM »
Ahh, but you knew what film I meant  :))
All the best Clive

Offline Jamie R

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Re: Rotus Project Build
« Reply #910 on: December 10, 2019, 09:42:00 PM »
That's karate kid, i remember that.....

I thought gas shopper was from Kung fu.........

I've just noticed the predictive text on grasshopper and I'm purposely leaving it as gas shopper is funnier lol
Its just Rotors and GRP
Rx8 powered Lotus Elan +2,
'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster

Offline Jamie R

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Re: Rotus Project Build
« Reply #911 on: December 11, 2019, 07:27:15 PM »


Here ya go jon.....

..... notes from college on plcs and control functions.....

Saw this n thought, Jon that poor guy !


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Its just Rotors and GRP
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'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster

Offline Jamie R

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Re: Rotus Project Build
« Reply #912 on: December 11, 2019, 07:29:16 PM »


Good lord !


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Its just Rotors and GRP
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'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster

Offline boosted

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Re: Rotus Project Build
« Reply #913 on: December 11, 2019, 07:51:17 PM »
Ladder logic is ace!  So much simpler than Siemens. My favourite was Telemecanique literal code...first i learnt....i hardly do any plc work now ..tiny bit of mitsi....

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« Last Edit: December 11, 2019, 07:53:54 PM by boosted »
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EAT SLEEP ROTOR REPEAT.

Offline Jamie R

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Re: Rotus Project Build
« Reply #914 on: December 11, 2019, 09:43:04 PM »

Like I said,  I know you will do your homework :great:


So, contrary to my comments yesterday, the rear M/C is 0.7" not 0.75" I got confused with the clutch M/C, that said the escort one was still 0.75"

Anyway, rx8 front calipers have a piston diameter of 51mm and the rears are 42.9mm. Front M/C has a diameter of 15.875mm and the rears 17.78mm

Pressure applied to the brake pedal will be equal across each M/C, not to be confused with travel in mm.

So using the force ratio formula, if I applied 100 N to the brake pedal, then there will be 51472 N applied to the front discs and 32518 N

Hence more force to the Fronts as you'd expect.

Havnt worked out the travel required on each M/C yet, but I bet the piston travel is probably less than 2mm - 3mm to pull it up to a halt.
Its just Rotors and GRP
Rx8 powered Lotus Elan +2,
'54 RX8 Strato Blue.
'92 V-spec Eunos Roadster