RX8 conversion project

Discuss and exchange views and technical information about our cars.

Moderators: erikscimitardemon, philhoward, Lukeyboy46, Roger Pennington

RX8 conversion project

Postby bigswordford » Sat Jan 28, 2017 6:33 pm

After nearly three years of suffering a tortuous linkage, slow changes, oil seepage, and a crunchy reverse I've decided to upgrade the gearbox in my 6a when the engine comes out for a rebuild this spring.
RX8 boxes seem to be en vogue at the moment although I can't find a project thread from anyone who's mated one to an Essex (but Corky's Cologne thread has provided inspiration).
After a bit of research I've decided to take the plunge and hope to keep up a project thread, which is more likely to be a plea for help and advice rather than anything instructional! Here's a breakdown of where I'm at and what's known:

The gearbox: I've purchased a 5 speed box complete with slave and stick. The ratios seem better suited, although I then phoned p9cyoplates who think the 5 speed is weaker and may struggle with my ~200 bhp Essex :w

Adaptor plate: Purchased from p9cyoplates.co.uk.

Master cylinder: I'll have a braided hose made up and will try to use the existing master cylinder

Clutch: standard (uprated) Essex item

Prop: custom made utilising the RX8 yoke

Gearbox mount: Will need to sit slightly further back from existing mount. Custom bracket using existing bolt holes

Spigot bearing: not sure about this. I think it needs one from a type 9? p9cyoplates no longer include a spigot extender as part of their Essex kit and seem to think if the input shaft isn't long enough to fully home in the bearing just leave it out. Surely not?! it must be known if the input shaft is long enough.

Reverse switch: Straightforward replacement of existing switch

Speedometer: not sure which way to go here. GPS or prop sensor?

Gearstick position: If the RX8 box is the same length as the type 9 where will the stick emerge and how best to cover the existing hole in the interior fairing? I doubt a massive gaiter will do.

Have I missed anything out?
bigswordford
 
Posts: 233
Joined: Mon May 26, 2014 12:26 pm
Has thanked: 2 times
Been thanked: 3 times

Re: RX8 conversion project

Postby philhoward » Sat Jan 28, 2017 7:02 pm

Spigot bearings - I'd say that if they weren't needed, manufacturers wouldn't have fitted them in the first place but I think it depends on the gearbox (or rather then length of the input shaft)? For example, where FWD and RWD variants of the same engine exist, you'll normally find the RWD engine has a spigot beating but the FWD version doesn't. I suspect that may be down to the gearbox construction though - FWD ones tend to have a single long main shaft so are supported adequately. Does anyone know the internal construction of the RX8 box?
Phil Howard
Scimitarweb Forum Admin
SS1's - 1600 Rooster Turbo; Sabre Mk1.5
SE5a Barn Find Project 24 Valve conversion
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.
User avatar
philhoward
RSSOC Member
 
Posts: 22335
Joined: Tue Aug 29, 2006 5:41 pm
Location: Staffs, UK
Has thanked: 38 times
Been thanked: 427 times

Re: RX8 conversion project

Postby Corky » Sat Jan 28, 2017 7:42 pm

Have you actually got your plate from p9cyoplates?

He has had an awful lot of bad reviews on other forums. Some people complaining of paying for plates and not receiving them.

I would take his comments about the 5 speed being a weaker box with a pinch of salt. From my research there were no issues with either being reported as weak in any way.

I would definitely get an input shaft extender made up and fit a spigot bearing. There should be some photos of one on my thread.
Steve
Current:- Sabre Ti sprint car, Audi A4 B8 Avant Quattro, SS1 race car project.
Prev:- SS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"
User avatar
Corky
RSSOC Member
 
Posts: 9689
Images: 1
Joined: Sun Sep 24, 2006 5:02 am
Location: Macclesfield
Has thanked: 60 times
Been thanked: 82 times

Re: RX8 conversion project

Postby bigswordford » Sat Jan 28, 2017 7:51 pm

Thought as much - I definitely won't fit without the bearing. No idea why he's stopped supplying the extender.
I've just ordered it. Ill give them a call and ask how long it should take
bigswordford
 
Posts: 233
Joined: Mon May 26, 2014 12:26 pm
Has thanked: 2 times
Been thanked: 3 times

Re: RX8 conversion project

Postby Corky » Sat Jan 28, 2017 7:56 pm

This thread should help http://www.turbosport.co.uk/showthread.php?t=500016 .

An awful lot to take in. But you'll see that there's s guy on there that's started making them himself, but using better engineering techniques and CAD.
Steve
Current:- Sabre Ti sprint car, Audi A4 B8 Avant Quattro, SS1 race car project.
Prev:- SS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"
User avatar
Corky
RSSOC Member
 
Posts: 9689
Images: 1
Joined: Sun Sep 24, 2006 5:02 am
Location: Macclesfield
Has thanked: 60 times
Been thanked: 82 times

Re: RX8 conversion project

Postby bigswordford » Sat Jan 28, 2017 8:00 pm

I've seen this thread but gave up at about page 4! Thanks, I'll get stuck in.

I'll add some pics as I get started
bigswordford
 
Posts: 233
Joined: Mon May 26, 2014 12:26 pm
Has thanked: 2 times
Been thanked: 3 times

Re: RX8 conversion project

Postby Corky » Sat Jan 28, 2017 8:02 pm

It's well worth reading the lot. Lots of useful snippets dotted throughout.
Steve
Current:- Sabre Ti sprint car, Audi A4 B8 Avant Quattro, SS1 race car project.
Prev:- SS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"
User avatar
Corky
RSSOC Member
 
Posts: 9689
Images: 1
Joined: Sun Sep 24, 2006 5:02 am
Location: Macclesfield
Has thanked: 60 times
Been thanked: 82 times

Re: RX8 conversion project

Postby bigswordford » Mon Feb 06, 2017 8:52 pm

Well I have read the thread and gleaned some useful information. Sure enough I'm still waiting for the adaptor plate - I'm assured it will be posted tomorrow.

The spigot extender is no longer included in the kit - much better to trim the bellhousing 10mm apparently, so the clutch plate sits fully on the splines. Of slight concern was his suggestion to do it with a cutting disc. Sounds a bit heath robinson to me so i'll take it to a machine shop.
bigswordford
 
Posts: 233
Joined: Mon May 26, 2014 12:26 pm
Has thanked: 2 times
Been thanked: 3 times

Re: RX8 conversion project

Postby Corky » Mon Feb 06, 2017 9:58 pm

PM sent.
Steve
Current:- Sabre Ti sprint car, Audi A4 B8 Avant Quattro, SS1 race car project.
Prev:- SS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"
User avatar
Corky
RSSOC Member
 
Posts: 9689
Images: 1
Joined: Sun Sep 24, 2006 5:02 am
Location: Macclesfield
Has thanked: 60 times
Been thanked: 82 times

Re: RX8 conversion project

Postby bigswordford » Fri Feb 17, 2017 3:11 pm

The goodies are beginning to trickle in for the project.

After much nervousness about the adapter plate it is better finished than expected, if not exactly a work of art. Remains to be seen if it fits ok though.

An uprated clutch kit and cam bearings have also arrived. What's the best way of removing cam bearings without the special tool?
Attachments
Capture.JPG
Capture.JPG (73.04 KiB) Viewed 630 times
bigswordford
 
Posts: 233
Joined: Mon May 26, 2014 12:26 pm
Has thanked: 2 times
Been thanked: 3 times

Re: RX8 conversion project

Postby BusaPhill » Sat Feb 18, 2017 12:08 am

Fellow from work he's well into RX7-8
Says the 5 speed is stronger than the 6 speed.
He's also got a spare 6 Speed.
So I've just blagged that as a spare incase my Auto go's tits up.
Might see if he has a spare 13b engine to go with it.

Watching this really closely now.
Last edited by BusaPhill on Sat Feb 18, 2017 6:01 am, edited 1 time in total.
1979 Scimitar SE6A V6 3.1Auto
2005 Mercedes C320 V6 3.0 Diesel (Daily Driver).
BusaPhill
RSSOC Member
 
Posts: 87
Joined: Sun Jun 28, 2015 10:28 pm
Location: Sutton,Surrey.
Has thanked: 2 times
Been thanked: 1 time

Re: RX8 conversion project

Postby stocks71 » Sat Feb 18, 2017 1:00 am

After owning (garaged at mo) a RX8 for a year or so the gearbox and 13b engine worked so well together. Not as quick a short shift as with the earlier Eunos MX5 I had but good all the same. The 13b engine is great in both its general formats and would be very interesting to see them kept together albeit in another car/format. One thing that I have issues with is with the fuelling/air intake on the RX8. It takes up the engine bay with plastic ducting ect. It works superb and is refined and tuned to perfection by Mazda but looks boring and modern even though 15 years old now. A 4 barrel Holley or Downdraft could be cool. Custom ignition ect.
I have this dream. Not that I don't like the Essex. I love it. I am just intrigued about half the weight and double the power and 10.000rpm. Makes such a Fiery racket too. Now is the time for cheap Mazda RX stuff as all the engines/cars are coming to that 70,000-100,000 rebuild time. A lot of the owners cannot be bothered with a rebuild as with any other 'Normal' car. Engine work is fairly easy and pleasant. I am just struggling with dark nights rain and alone trying to manhandle the lump back in......
Here's my front Dorito :)
Image
1972 SE5a GTE
2004 Mazda RX8 231PS - Broken
1990 Golf GTi 8V - Daily
stocks71
 
Posts: 904
Images: 4
Joined: Sat Feb 14, 2009 2:03 am
Location: Wiltshire
Has thanked: 4 times
Been thanked: 1 time

Re: RX8 conversion project

Postby BusaPhill » Sat Feb 18, 2017 6:03 am

I just love those Rotaries

Haven't stripped one down since the early eighties.

Did put one in a Mk2 Escort van
Boy that thing shifted.
1979 Scimitar SE6A V6 3.1Auto
2005 Mercedes C320 V6 3.0 Diesel (Daily Driver).
BusaPhill
RSSOC Member
 
Posts: 87
Joined: Sun Jun 28, 2015 10:28 pm
Location: Sutton,Surrey.
Has thanked: 2 times
Been thanked: 1 time

Re: RX8 conversion project

Postby Corky » Sat Feb 18, 2017 12:47 pm

That plate does look better finished than the one I was sent. :D
Steve
Current:- Sabre Ti sprint car, Audi A4 B8 Avant Quattro, SS1 race car project.
Prev:- SS1 Ti, SS1 16v Turbo Racer, 5XGTC, 2XSE6B, 2XSE5A, 2XV6 Coupe, Sabre 6
Project Threads & YouTube

“It's not the winning, it's the taking apart that counts"
User avatar
Corky
RSSOC Member
 
Posts: 9689
Images: 1
Joined: Sun Sep 24, 2006 5:02 am
Location: Macclesfield
Has thanked: 60 times
Been thanked: 82 times

Re: RX8 conversion project

Postby CNHSS1 » Sat Feb 18, 2017 2:03 pm

Triple rotor GTE For the win!

Mad Mike at Goodwood--liaten to that thing wail!!!

https://youtu.be/mY3tX7L_TfM

To be fair James Carter's Skyline GTE goes pretty similar :8
Racing is life, everything before and after, is just waiting--Steve McQueen
6 time Class Champ, 2006 & 2014 SSSC Champion

RIP Batmobile, await the Rise of Dark Knight 8)
Sabre 'Light Sabre' 360hp!!
Image
User avatar
CNHSS1
RSSOC Member
 
Posts: 13127
Images: 4
Joined: Tue Aug 22, 2006 5:13 pm
Location: Shrewsbury, Shropshire
Has thanked: 74 times
Been thanked: 171 times

Next

Return to General Technical Discussion

Who is online

Users browsing this forum: No registered users and 2 guests