Rx 4 coupe project

[apex_lt]

Hi everyone. I think it is First "Hello" from Lithuania. I have mazda rx4/929 coupe 77\'>75. At this time it is not rotor engine  was trying to find 13b in good condition, but here we don\'t have rx cars (even rx7 is rare car) second engine was maserati biturbo - V6 twin turbo 240BHP 340Nm, didn\'t fit oil sump, and turbo    so i placed ford 2,9 cosworth engine.
know i want to upgrade brakes. what do you guys doing with your old brakes? I know you have brake kits, but here i don\'t have, and they are quite expensive. so may be it is posible to swap others cars brake rotors and callipers?

Second question - i need bumpers - front and rear. where could i get them?

thanks

[mullins]

Late 80\'s/early 90\'s model Mazda 626/Ford Telstar (FWD) vented discs will fit then you just need to make some brackets to mount some better calipers like 4 port RX-7, Nissan 300ZX, etc. Send me a pm if you want more details.

PS. Lets see some pics of your 4!

[apex_lt]

here are some pictures:

i bought it the way it looks (without wheels)



looks a little bit better?

this is BMW 320 (E30) disc rotor and volvo 240 calliper.


bmw 320 disc rotor is quite the same as mazda gc

problem is that volvo 240 calliper is offset (out of hub) so i can\'t use my flat steel wheels.
and i don\'t have calliper brackets.

here is mazda and BMW rotor:



bmw a little bit higher 35,1mm mazda 34,6
but bmw is 260mm mazda 250mm
i have ford scorpio calliper it could fit 260mm bmw rotor.

p.s. Mullins i can\\t PM you, i\'m not a full member please write here.

[mullins]

I doubt any conversion to a decent setup will allow you to keep the steel wheels. If you really want to keep the steels you could do the old first gen RX-7 conversion.

EDIT: The 2 bolt plan above looks too dodgy in my opinion.

[apex_lt]

my steel wheels are 8.5" wide R15
tell me more about 1 gen rx7 conversation?
actualy i have 2 gen rx7 callipers is it worth?
p.s. rx3 hubs are not hte same as rx4 ? because i found a lot off common brake conversation for rx3

[mullins]

The conversion I\'m talking about usually involves swapping the entire front mcphearson(spelling) strut across. That way you don\'t need to worry about hub sizes/stud patterns/caliper mountings, etc, etc.

MikeLMR has done this conversion on his 323 so maybe having a look at his post in this section may help. Obviously it may not be exactly the same (being an RX-4) but I\'m sure you could get it to work!

[apex_lt]

thanks. i will try to find it. i was thinking about swaping all strut from other car but there will  be a lot of problems with steering system. but everything is imposible.
thanks.

[apex_lt]

does anybody done conversation with volvo 240 4 pot callipers?
looks like i will go for this upgrade.
maybe somebody has calliper bracket dimensions?

[apex_lt]

hi everyone. it\'s me again.

Finaly i find the best (i hope) pair of brake rotor and calliper.
Here is Nissan 200sx (or nissan silvia S13  1,8 turbo) 280mm brake rotor, with mazda rx7 S4/5 4pot calliper.
i will make 4 new holes. brake rotor will mount on front of hub. nissan is 4x114.3 PCD.

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one little problem - mazda has 4x110mm pcd - i need 4x108 pcd (audi, ford wheels)
now i thinking houw to make 108 from 110...
also i need calliper brackets.
calliper brackets should be steel or aluminium?

[Richard]

I have been using Ford wheels on both my 1000/1300\'s and my 323\'s without a problem for about 20 years now, including a lot of rallying. The thing is though is that I have always converted my hubs to take the wheel studs as shown below.



When you tighten the wheel onto the studs, they just move slightly to take up the 2mm difference, and as I say never had any problems. :cool

I was also going to use the BMW disc but with the Ford Escort M16 caliper, but had the same problem with fitting the wheel



Why the Ford caliper? well because with only a small amount of filling to one mount hole it bolted straight on. And if that fitted,then Princess 4 pots would have done also



This did\'nt work out so the brakes I am using now are vented discs from the 1800cc MX5/Miata machined to fit the standard 1300 hub, and then alloy M16 replacement calipers. These are exactly the same piston size as the original calipers so no worries with brake bias.

If I had gone for 4 pots then there\'d be all the hastle of a bias peddle box and so on. And anyway who needs brakes in a 1000 - you need to keep all the momentum you can get:Giggle

If in doubt - change up :3gears-rh

Rich

[apex_lt]

Finaly i have caliper brackets.
There was some questions about strenght of this bracket. but people who made it, told me that this is verry strong welding (ithink it is TIG welding). so i hope they are right. what do you think guys?

[MikeLMR]

it\'s a bit difficult to see but they don\'t look ideal, are they fully welded ?

There seems to be a massive amount of material where it is not really needed (on the backplate adapter) and not a lot of material where it IS needed (to support the caliper) having said that its probably way stronger than the original style mountings BUT they would have had their life and strength checked by qualified engineers so homemade stuff needs to be over engineered to ensure it is safe.

[Richard]

I agree with all the points that Mike has made.
        The ring looks to be a flange, the type we used to join steam pipes and the like at the creamery where I worked. They are available in many diameter/centre bore/thickness and bolt PCD configurations. And, on top of that, it looks awfully like stainless steel, hence the TIG welding,although I could be wrong :confused: Extremely stong but a bit OTT tho\'.
      Another point is the position of the caliper - you really need to rotate it in one direction or the other so that you can bleed the air out of the system properly -  just make sure that the bleed nipple is at the highest point.

Rich

[apex_lt]

this bracket was made by profesional welders. i hope they know what they are doing.
The back plate is done corectly i asked to do moro holes to have posibility to change position of the caliper (at this time caliper is bolted on "12 hour", also i have posibility to bolt it in position of "2 hour" and 10.

Mike > Yes it is fully weldet.

here is more pictures:



hope it will be stron enough.

[apex_lt]

ok. here is right position.