Supercharged RX-8 Engine Renaissance

For you to showcase what you've done to your car and give other members ideas and inspiration.
User avatar
mrspiller
Club Member
Club Member
Posts: 2348
Joined: Wed Dec 02, 2015 7:04 pm
RX-8: 231
Colour: Copper Red
Location: Hengoed - South Wales
Has thanked: 112 times
Been thanked: 258 times

Re: Supercharged RX-8 Engine Renaissance

Post by mrspiller » Wed Mar 25, 2020 4:59 pm

casey wrote:Wayne - do you know the NGK part number you were recommended to use?

I've experienced this (on 3 plugs now), and we've had several reports of this failure mechanism on the forum.

I was wondering whether it was possible to use the plug used the FD engine, which has a 4 post electrode design?

Anyone any thoughts/ideas?
I think they are FD plugs
I kept the box - I’ll have a look
Was advised to use them on my turbo car


Sent from my iPhone using Tapatalk

User avatar
mrspiller
Club Member
Club Member
Posts: 2348
Joined: Wed Dec 02, 2015 7:04 pm
RX-8: 231
Colour: Copper Red
Location: Hengoed - South Wales
Has thanked: 112 times
Been thanked: 258 times

Re: Supercharged RX-8 Engine Renaissance

Post by mrspiller » Wed Mar 25, 2020 5:02 pm

casey wrote:Wayne - do you know the NGK part number you were recommended to use?

I've experienced this (on 3 plugs now), and we've had several reports of this failure mechanism on the forum.

I was wondering whether it was possible to use the plug used the FD engine, which has a 4 post electrode design?

Anyone any thoughts/ideas?
Malcolm
These I think , if you could find out if they are FD plugs Image


Sent from my iPhone using Tapatalk
These users thanked the author mrspiller for the post:
casey (Wed Mar 25, 2020 9:19 pm)

User avatar
warpc0il
Spin Doctor
Spin Doctor
Posts: 23539
Joined: Sat Sep 06, 2008 10:56 pm
RX-8: 231
Colour: Lightning Yellow
Location: Groomsport, Co Down, NI
Has thanked: 370 times
Been thanked: 1405 times
Contact:

Re: Supercharged RX-8 Engine Renaissance

Post by warpc0il » Wed Mar 25, 2020 5:16 pm

Check the holes before replacing the plugs, as there's only a tiny opening into the combustion chamber and the electrodes might not have made it through.

The last time I found a plug with a broken electrode I checked the hole and found two inside. :shock:

The only explanation was that a previous plug had broken, leaving the electrode inside, which had then damaged the new plug when it was inserted.

On this same engine the plugs for the rear rotor had the leading and trailing plugs in the wrong holes.

Not my car BTW. ..

Sent from my SM-G800F using Tapatalk
These users thanked the author warpc0il for the post:
ChrisHolmes (Wed Mar 25, 2020 5:45 pm)
Dave
The Spin Doctor ™
uǝǝɹɔs ɹnoʎ ʇɹǝʌuı ǝsɐǝld :ɹoɹɹǝ

User avatar
ChrisHolmes
Committee Member
Committee Member
Posts: 17092
Joined: Sun Jan 29, 2006 10:04 pm
RX-8: 231
Colour: Custom
Location: Cheltenham
Has thanked: 4494 times
Been thanked: 1847 times

Re: Supercharged RX-8 Engine Renaissance

Post by ChrisHolmes » Wed Mar 25, 2020 5:44 pm

Nothing lurking in the hole that I could see but it’s hard to look into!
Ran a compression test and the results are below. Built by me, Street Ported, Goopy seals, 6000 miles three track days
Attachments
P1120325.JPG
Supercharged
Racing Beat Alloy flywheel
Exedy Stg1 Clutch
White Line ARBs
Speedline diamond cut alloy wheels
Custom front bumper, grills & Side Skirts
Mazdaspeed Rear Spoiler (Customised)
Rear Diffuser
SOHN Adaptor
Adaptronic ECU

User avatar
nightfire10
Club Member
Club Member
Posts: 2859
Joined: Sun Sep 28, 2014 9:11 pm
RX-8: 40th Anniversary
Colour: Crystal White
Location: poole dorset
Has thanked: 729 times
Been thanked: 285 times

Re: Supercharged RX-8 Engine Renaissance

Post by nightfire10 » Wed Mar 25, 2020 5:54 pm

Wouldn't mind them numbers
Hayward's Street/bridgeported rebuild,595's,Tein coilovers edfc Racingbeat rear anti roll bar oil pres oil temp gauge pod's,lockwood front rear grills,Tinted wind ws folding tow hook's,595s,connect2
To do install sohn tank bracket made but still need to get time to install,caliper painting :thumright:
180 of 400

User avatar
nightfire10
Club Member
Club Member
Posts: 2859
Joined: Sun Sep 28, 2014 9:11 pm
RX-8: 40th Anniversary
Colour: Crystal White
Location: poole dorset
Has thanked: 729 times
Been thanked: 285 times

Re: Supercharged RX-8 Engine Renaissance

Post by nightfire10 » Wed Mar 25, 2020 6:53 pm

OK perhaps not
Hayward's Street/bridgeported rebuild,595's,Tein coilovers edfc Racingbeat rear anti roll bar oil pres oil temp gauge pod's,lockwood front rear grills,Tinted wind ws folding tow hook's,595s,connect2
To do install sohn tank bracket made but still need to get time to install,caliper painting :thumright:
180 of 400

User avatar
Velocity_Dan93
Club Member
Club Member
Posts: 714
Joined: Fri Nov 28, 2014 12:12 am
RX-8: 231
Colour: Velocity Red
Location: lichfield
Has thanked: 27 times
Been thanked: 57 times

Re: Supercharged RX-8 Engine Renaissance

Post by Velocity_Dan93 » Wed Mar 25, 2020 7:38 pm

What clearances did you use ? And did you think about the charger when did them ?
VR bridge port Mazdaspeed with lambo doors yo!
GG bridge port track missile
Phantom stock engine impulse buy #-o

User avatar
ChrisHolmes
Committee Member
Committee Member
Posts: 17092
Joined: Sun Jan 29, 2006 10:04 pm
RX-8: 231
Colour: Custom
Location: Cheltenham
Has thanked: 4494 times
Been thanked: 1847 times

Re: Supercharged RX-8 Engine Renaissance

Post by ChrisHolmes » Wed Mar 25, 2020 7:51 pm

Velocity_Dan93 wrote:
Wed Mar 25, 2020 7:38 pm
What clearances did you use ? And did you think about the charger when did them ?
The plugs are are pre-gapped. I have tried adjusting old plugs and the electrode just falls off!
Supercharged
Racing Beat Alloy flywheel
Exedy Stg1 Clutch
White Line ARBs
Speedline diamond cut alloy wheels
Custom front bumper, grills & Side Skirts
Mazdaspeed Rear Spoiler (Customised)
Rear Diffuser
SOHN Adaptor
Adaptronic ECU

User avatar
mrspiller
Club Member
Club Member
Posts: 2348
Joined: Wed Dec 02, 2015 7:04 pm
RX-8: 231
Colour: Copper Red
Location: Hengoed - South Wales
Has thanked: 112 times
Been thanked: 258 times

Re: Supercharged RX-8 Engine Renaissance

Post by mrspiller » Wed Mar 25, 2020 9:06 pm

I’m lost - don’t understand them


Sent from my iPhone using Tapatalk

User avatar
Clive
Club Member
Club Member
Posts: 1151
Joined: Sun Jan 30, 2005 6:39 pm
RX-8: Supercharged
Colour: Lightning Yellow
Has thanked: 266 times
Been thanked: 351 times

Re: Supercharged RX-8 Engine Renaissance

Post by Clive » Wed Mar 25, 2020 9:24 pm

mrspiller wrote:
Wed Mar 25, 2020 4:39 pm
Chris
If you been thrashing that car it probably got too hot for the plugs
I was told to use ngk v power racing plugs
You need to use NGK BUR9EQ Plugs, those 10's are too cold for your car
These users thanked the author Clive for the post:
casey (Wed Mar 25, 2020 9:34 pm)

User avatar
casey
Committee Member
Committee Member
Posts: 9215
Joined: Sun Jun 27, 2004 7:14 pm
RX-8: 231
Colour: Titanium Grey
Location: Colchester
Has thanked: 950 times
Been thanked: 1136 times

Re: Supercharged RX-8 Engine Renaissance

Post by casey » Wed Mar 25, 2020 9:30 pm

These are commonly used on FD engine, BUR9EQ

https://www.opieoils.co.uk/p-63844-ngk- ... SUQAvD_BwE

Need to check physical dimensions, but anyone got any thoughts on these? The 4 shoulders act as the ground electrode, so no tip to fall off!
Club Secretary
Essex Rotary Full Bridgeport

Seibon Carbon Fibre Bonnet
"Racing Brake" front calipers, Racing Beat (RB) ARB's F&R, RB REVI intake, full RB Stainless Steel Exhaust & Mani, 20mm Eibach spacers, KOYO Ali Rad, Lightened Fly, Tein MonoFlex coilovers & strut brace, Axial short-shifter, BHR Coils & Engine Mounts, Greddy Sump
Federal 595RS-R or Rainsport 3

User avatar
casey
Committee Member
Committee Member
Posts: 9215
Joined: Sun Jun 27, 2004 7:14 pm
RX-8: 231
Colour: Titanium Grey
Location: Colchester
Has thanked: 950 times
Been thanked: 1136 times

Re: Supercharged RX-8 Engine Renaissance

Post by casey » Wed Mar 25, 2020 9:33 pm

:D :D Clive beat me to it.

TBF, it was Clive who suggested to me to try the FD plugs when I described the state of my last set of plugs
Club Secretary
Essex Rotary Full Bridgeport

Seibon Carbon Fibre Bonnet
"Racing Brake" front calipers, Racing Beat (RB) ARB's F&R, RB REVI intake, full RB Stainless Steel Exhaust & Mani, 20mm Eibach spacers, KOYO Ali Rad, Lightened Fly, Tein MonoFlex coilovers & strut brace, Axial short-shifter, BHR Coils & Engine Mounts, Greddy Sump
Federal 595RS-R or Rainsport 3

User avatar
MightyCondor
Club Member
Club Member
Posts: 862
Joined: Sat Jul 27, 2013 3:14 pm
RX-8: 231
Colour: Sunlight Silver
Location: Reading, Berks
Has thanked: 141 times
Been thanked: 239 times

Re: Supercharged RX-8 Engine Renaissance

Post by MightyCondor » Wed Mar 25, 2020 9:37 pm

Yeah the 9s are the main choice of plug for lightly modified FDs. I only went to a combination of 9s and 10s after the single turbo conversion and 400whp+.

Don't know much about using FD plugs on an 8. Rob Dahm uses RX8 plugs on his FDs though...

Sent from my Pixel XL using Tapatalk

2004 Sunlight Silver 231 Impulsive Panic Buy Rotary Shed & lesser seen RX-7 FD3s
2005 Winning Blue 231 - Loved and set free (sold) :(
2004 Winning Blue 231 - Lost at the hands of a careless BMW driver

User avatar
warpc0il
Spin Doctor
Spin Doctor
Posts: 23539
Joined: Sat Sep 06, 2008 10:56 pm
RX-8: 231
Colour: Lightning Yellow
Location: Groomsport, Co Down, NI
Has thanked: 370 times
Been thanked: 1405 times
Contact:

Re: Supercharged RX-8 Engine Renaissance

Post by warpc0il » Wed Mar 25, 2020 9:47 pm

Funny you should say that, as many of the highly-tuned FD's in Irish Rotary also used RX8 plugs, as they also do in NZ...
Dave
The Spin Doctor ™
uǝǝɹɔs ɹnoʎ ʇɹǝʌuı ǝsɐǝld :ɹoɹɹǝ

User avatar
Lemon
Forum Moderator
Forum Moderator
Posts: 1266
Joined: Wed Nov 30, 2016 4:08 pm
RX-8: 231
Colour: Winning Blue
Location: Wiltshire
Has thanked: 29 times
Been thanked: 158 times

Re: Supercharged RX-8 Engine Renaissance

Post by Lemon » Thu Mar 26, 2020 8:47 am

qwakers wrote:
Wed Mar 25, 2020 4:51 pm
that is the third time in less than a year that ive seen a rx8 plug fail like that !
mine included?

i'd wondered if the electrode had burnt away whilst on track.
Thanks, Stu

User avatar
Clive
Club Member
Club Member
Posts: 1151
Joined: Sun Jan 30, 2005 6:39 pm
RX-8: Supercharged
Colour: Lightning Yellow
Has thanked: 266 times
Been thanked: 351 times

Re: Supercharged RX-8 Engine Renaissance

Post by Clive » Thu Mar 26, 2020 9:38 am

warpc0il wrote:
Wed Mar 25, 2020 9:47 pm
Funny you should say that, as many of the highly-tuned FD's in Irish Rotary also used RX8 plugs, as they also do in NZ...
I was told the same, so we tried a set of RX-8 RE9's while I was on the Dyno and that was just a waste of a set of plugs, the car ran really horrible and we had to take them straight back out #-o
Attachments
Dyno 2.jpg
Dyno 2.jpg (149.24 KiB) Viewed 71 times
Last edited by Clive on Thu Mar 26, 2020 9:41 am, edited 2 times in total.
These users thanked the author Clive for the post (total 2):
casey (Thu Mar 26, 2020 10:44 am) • ChrisHolmes (Thu Mar 26, 2020 1:15 pm)

User avatar
ChrisHolmes
Committee Member
Committee Member
Posts: 17092
Joined: Sun Jan 29, 2006 10:04 pm
RX-8: 231
Colour: Custom
Location: Cheltenham
Has thanked: 4494 times
Been thanked: 1847 times

Re: Supercharged RX-8 Engine Renaissance

Post by ChrisHolmes » Thu Mar 26, 2020 9:40 am

Burning away would leave a stub where it was originally welded. I think there is a weak weld issue causing the problem as the location groove is clean.
Supercharged
Racing Beat Alloy flywheel
Exedy Stg1 Clutch
White Line ARBs
Speedline diamond cut alloy wheels
Custom front bumper, grills & Side Skirts
Mazdaspeed Rear Spoiler (Customised)
Rear Diffuser
SOHN Adaptor
Adaptronic ECU

User avatar
Lemon
Forum Moderator
Forum Moderator
Posts: 1266
Joined: Wed Nov 30, 2016 4:08 pm
RX-8: 231
Colour: Winning Blue
Location: Wiltshire
Has thanked: 29 times
Been thanked: 158 times

Re: Supercharged RX-8 Engine Renaissance

Post by Lemon » Thu Mar 26, 2020 10:04 am

ChrisHolmes wrote:
Thu Mar 26, 2020 9:40 am
Burning away would leave a stub where it was originally welded. I think there is a weak weld issue causing the problem as the location groove is clean.
i think i did have a little nubbin left on the one that had gone for me, no idea where the plugs are now though i think i gave them to Tim.
Thanks, Stu

User avatar
casey
Committee Member
Committee Member
Posts: 9215
Joined: Sun Jun 27, 2004 7:14 pm
RX-8: 231
Colour: Titanium Grey
Location: Colchester
Has thanked: 950 times
Been thanked: 1136 times

Re: Supercharged RX-8 Engine Renaissance

Post by casey » Thu Mar 26, 2020 10:49 am

Just a thought. How many people who have experienced this issue are running with aftermarket coils with the dwell changed? Wild theory that the extra spark energy at high rev track stress could lead to local overheating and weld failure?
Club Secretary
Essex Rotary Full Bridgeport

Seibon Carbon Fibre Bonnet
"Racing Brake" front calipers, Racing Beat (RB) ARB's F&R, RB REVI intake, full RB Stainless Steel Exhaust & Mani, 20mm Eibach spacers, KOYO Ali Rad, Lightened Fly, Tein MonoFlex coilovers & strut brace, Axial short-shifter, BHR Coils & Engine Mounts, Greddy Sump
Federal 595RS-R or Rainsport 3

User avatar
Lemon
Forum Moderator
Forum Moderator
Posts: 1266
Joined: Wed Nov 30, 2016 4:08 pm
RX-8: 231
Colour: Winning Blue
Location: Wiltshire
Has thanked: 29 times
Been thanked: 158 times

Re: Supercharged RX-8 Engine Renaissance

Post by Lemon » Thu Mar 26, 2020 12:15 pm

i am running a set of RRP coils, however i do also have a weeping injector which probably doesn't help with matters
Thanks, Stu

User avatar
ChrisHolmes
Committee Member
Committee Member
Posts: 17092
Joined: Sun Jan 29, 2006 10:04 pm
RX-8: 231
Colour: Custom
Location: Cheltenham
Has thanked: 4494 times
Been thanked: 1847 times

Re: Supercharged RX-8 Engine Renaissance

Post by ChrisHolmes » Thu Mar 26, 2020 12:44 pm

Hmm! I am running RRP coils too, fuel wise it was a weeping wallet.
Supercharged
Racing Beat Alloy flywheel
Exedy Stg1 Clutch
White Line ARBs
Speedline diamond cut alloy wheels
Custom front bumper, grills & Side Skirts
Mazdaspeed Rear Spoiler (Customised)
Rear Diffuser
SOHN Adaptor
Adaptronic ECU

User avatar
mrspiller
Club Member
Club Member
Posts: 2348
Joined: Wed Dec 02, 2015 7:04 pm
RX-8: 231
Colour: Copper Red
Location: Hengoed - South Wales
Has thanked: 112 times
Been thanked: 258 times

Re: Supercharged RX-8 Engine Renaissance

Post by mrspiller » Thu Mar 26, 2020 12:55 pm

In my track car I got the 585 and had them for since the group buy . Phil mapped it to suit them. Haven't had a problem yet
Have only changed the plugs twice in 2 as many years


Sent from my iPhone using Tapatalk
These users thanked the author mrspiller for the post:
ChrisHolmes (Thu Mar 26, 2020 1:11 pm)

User avatar
warpc0il
Spin Doctor
Spin Doctor
Posts: 23539
Joined: Sat Sep 06, 2008 10:56 pm
RX-8: 231
Colour: Lightning Yellow
Location: Groomsport, Co Down, NI
Has thanked: 370 times
Been thanked: 1405 times
Contact:

Re: Supercharged RX-8 Engine Renaissance

Post by warpc0il » Thu Mar 26, 2020 1:07 pm

:whathesaid: for mine too.

Changed the plugs twice in the last 10 years* and not had any electrode damage.

Yes, overdue now but I'm not doing the mileage.
These users thanked the author warpc0il for the post:
ChrisHolmes (Thu Mar 26, 2020 1:11 pm)
Dave
The Spin Doctor ™
uǝǝɹɔs ɹnoʎ ʇɹǝʌuı ǝsɐǝld :ɹoɹɹǝ

User avatar
mrspiller
Club Member
Club Member
Posts: 2348
Joined: Wed Dec 02, 2015 7:04 pm
RX-8: 231
Colour: Copper Red
Location: Hengoed - South Wales
Has thanked: 112 times
Been thanked: 258 times

Re: Supercharged RX-8 Engine Renaissance

Post by mrspiller » Thu Mar 26, 2020 1:10 pm

I’ve done 5000. Track miles in 6 years
I do take them out annually and soak in brake cleaner , that’s about it


Sent from my iPhone using Tapatalk

User avatar
ChrisHolmes
Committee Member
Committee Member
Posts: 17092
Joined: Sun Jan 29, 2006 10:04 pm
RX-8: 231
Colour: Custom
Location: Cheltenham
Has thanked: 4494 times
Been thanked: 1847 times

Re: Supercharged RX-8 Engine Renaissance

Post by ChrisHolmes » Thu Mar 26, 2020 1:12 pm

mrspiller wrote:
Thu Mar 26, 2020 1:10 pm
I’ve done 5000. Track miles in 6 years
I do take them out annually and soak in brake cleaner , that’s about it


Sent from my iPhone using Tapatalk
Tightarse!
These users thanked the author ChrisHolmes for the post:
nightfire10 (Thu Mar 26, 2020 1:16 pm)
Supercharged
Racing Beat Alloy flywheel
Exedy Stg1 Clutch
White Line ARBs
Speedline diamond cut alloy wheels
Custom front bumper, grills & Side Skirts
Mazdaspeed Rear Spoiler (Customised)
Rear Diffuser
SOHN Adaptor
Adaptronic ECU

Post Reply

Return to “Personal Car Projects and Mods”