1972 Mazda Rx2- Moves to a new home

[MiataMark]

I think the photos issue is more iPhone/apple related than anything else they don't store all the EXIF data, you need to make sure that the phone is the right way up (lens at the bottom for landscape), probably still end up sideways though.

Inspiring work that sideways photos don't distract from though.

[eurogranada]

Those sills look excellent!

[Deleted]

Picked up some 13" alloys that I bought awhile back. Met up with a friend who had collected them for me a couple of months back ,at Goodwood yesterday. Seeing all machines running apart from the lathe, I thought I would have a little play before I pack them away



Cut off the unwanted bits





Think these will work out nice.....



Before and after. Still need to drill the centres and finish turn them,but you can get the idea.....

[tickman]

Jun 27, 2015 14:23:35 GMT @johnnybravo said:

That looks epic.

John

[luckyseven]

Mazda called, they want their mojo back

[Deleted]

Jun 27, 2015 16:06:28 GMT luckyseven said:

Mazda called, they want their mojo back

Of course they want their Mojo back.  Mojo San was their fibreglass body repair specialist in the late 80's. After stuffing the 767b into the wall at Goodwood yesterday, it's no wonder they feel they have lost their mojo    Car lives up to its motto, " never give up ".....

[mylittletony]

Jun 27, 2015 14:23:35 GMT @johnnybravo said:

Cut off the unwanted bits



Before and after. Still need to drill the centres and finish turn them,but you can get the idea.....

I don't know if you've seen this thread: big lathe fun, but you'd have a substantial market if you decided to offer this a service.

Excellent engineering work, this car will be quite the masterpiece - almost a shame most of it will look like standard!

FYI markbognor

[Deleted]

Yes, have seen that thread. With these cars being so few and far between in this country,most will never have seen one. So, subtle mods,sleeper approach. But,I think the 3 rotor motor should surprise quite a few......

[luckyseven]

Jun 27, 2015 17:05:06 GMT @johnnybravo said:

Jun 27, 2015 16:06:28 GMT luckyseven said:

Mazda called, they want their mojo back

Of course they want their Mojo back.  Mojo San was their fibreglass body repair specialist in the late 80's. After stuffing the 767b into the wall at Goodwood yesterday, it's no wonder they feel they have lost their mojo    Car lives up to its motto, " never give up ".....

lol

Horrible to see the 767/haybale interface Also horrible to see that despite the proliferation of righteous rotary racers in the paddock, the Mazda stand made no mention whatsoever that rotary engines ever existed. And that ridiculous nonsense in the Stable Yard.. what the actual hell was that all about? Like, as if there weren't enough MX-5s in the world already

[adam73bgt]

Jun 29, 2015 17:56:29 GMT @johnnybravo said:

3 rotor motor

As if this build wasn't good enough already

[Morris63]

Jun 29, 2015 19:10:38 GMT adam73bgt said:

Jun 29, 2015 17:56:29 GMT @johnnybravo said:

3 rotor motor

As if this build wasn't good enough already

Pardon my ignorance of things rotary, but is there a limit to how many rotors you could build, or is there an optimum number of rotors; e.g divisible by 3 (IIRC there are 3 lobes on each rotor?)

[luckyseven]

Jun 29, 2015 19:37:56 GMT Morris63 said:

Jun 29, 2015 19:10:38 GMT adam73bgt said:

As if this build wasn't good enough already

Pardon my ignorance of things rotary, but is there a limit to how many rotors you could build, or is there an optimum number of rotors; e.g divisible by 3 (IIRC there are 3 lobes on each rotor?)

Theoretically not, but you're limited mostly by the strength of the eccentric shaft (the crank equivalent that the rotors turn). Heat and lubrication become ever-increasing issues the more rotors you add, too. Having said that, several four-rotors have been built, not just by Mazda although the le Mans-winning cars were four-rotors detuned from 900bhp for reliability. Mercedes built quad rotors for their stillborn C111 concept, as did GM for their rotary Corvette. Mad Mike the Kiwi drifters' car is a Quad rotor built by PPRE down under. Who also built a frankly insane six-rotor RX4;



The question is, how much is enough? When even a fairly humble N/A twin rotor is good for 200bhp with comparatively few mods and light tuning, how many times do you need to snap half-shafts trying to build an eight rotor?



[/thread hijack] Sorry Johnny

[Deleted]

Material for the eccentric shaft is the limitation. 2,3,4 and even 6 rotor motors have all been made. Flexing of the shaft becomes a problem, the longer it gets. Technically, as long as your rotors are phased correctly in relation to each other, you can have as many,or as few as you like. When I started this build I wanted to build a three rotor motor. But with a short shaft, not like Mazdas 20b 3 rotor motor. I did a lot of surfing the net. Not much about it. More available about 4 rotor motors. Not that it's easy by any stretch of the imagination, but a four technically is easier to make than a three. So.... Seeing nobody could tell me any different, I started out with this....



And many sleepless nights that became this



With all lobes in place, this was the eccentric shaft, the rotary equivalent of what a crankshaft is to a pi$$ Tin engine



How it went from 45kgs down to a smidgen over 8kgs, the trials and tribulations and the Eureka moments are most probably best saved for a rainy day........

[Hillmanjames]

This thread just keeps getting better and better!

[adam73bgt]

So hang on a minute, you're not just lobbing a 20b in there? You're building your own three rotor engine? Epic.

Though I'm not sure why that should surprise me given what you've built for this so far

[logicaluk]

Picks up jaw from the floor... then checks weather report for rain.

This is amazing i wasnt expecting that. YAY a thread that is truly EPIC
My heads exploing with questions now.
What's the phasing how will you treat it and of course how the hell did he manage that.
Major pat on the back fella
Dan

[Deleted]

Jun 29, 2015 21:49:50 GMT adam73bgt said:

So hang on a minute, you're not just lobbing a 20b in there? You're building your own three rotor engine? Epic.

Though I'm not sure why that should surprise me given what you've built for this so far

Nope, no lobbing in sight,and no 20b. Custom built short shaft three rotor motor. It lands up about 50mm shorter than a 20b. 

[georgeb]

Gonna be able to learn even more about these roundy-round engines now. Excellent.

[Morris63]

Luckyseven, Johnny - thanks for the explanation.

And how cool will it be to be able to drop into the conversation "oh yes, the engine wasn't quite what I wanted so I built my own from scratch"

Epic with nobs on!

[MaxN]

I really did not think that this thread could get any more epic.

and then, casually you mention the 3-rotor.........

Holy mother of .......