RX8 manifold bolts

[Mr Spiller]

Evening all
I’ve started a Build  thread which is about 6 months late but I  need some advice .
Greddy manifold has warped slightly so it in the shop getting flatted out . Next  stop new manifold gasket and a friend who’s car the ramp on says try these
“U need exhaust studs and nuts. Inconel. M10 x 1.5. They may even sell, inconel studs with copper nuts, which is fine.”
Or better still are the RX7 any better ??
Help and advice please
Wayne



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[clive]

The warping will not have anything to do with the way the manifold was bolted on, so the standard studs and nuts will not be a problem with your nice flat manifold   

[Mr Spiller]

The warping will not have anything to do with the way the manifold was bolted on, so the standard studs and nuts will not be a problem with your nice flat manifold 

Thanks Clive
Are they the same on an RX7 ?
The nuts on the manifold studs weren’t the correct Mazda ones so that was probably the fault .
Wayne


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[boosted]

I was expecting a fine pitch of 1.25 on jap cars Wayne. When i done the rx7 i replaced all the studs and nuts.
I found various ebay sellers and bought from there. All inconel and i used the nuts with the split in the top that self lock. I also got some copper nuts but didnt use them as the split nut looked far superior...ill get the correct name an piccy in amo.

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[boosted]

https://www.ebay.co.uk/itm/STAINLESS-STEEL-M8-AEROTIGHT-NUT-AERO-NUT-LOCK-NUT-X-10-MOTORCYCLES-CARS-ETC/152566447541?hash=item2385ab3db5:g:FTgAAOSwHMJYGgrN

aero nuts are what i used bud...cant remember the pitch to be honest...But as Clives says its the heat that warps any mounting flanges...hence why i turned my boost down...as the blow on my turbos was flange warpage. Has it warped since mapping? or warped before?

other option is double nutting?

[Mr Spiller]

I was expecting a fine pitch of 1.25 on jap cars Wayne. When i done the rx7 i replaced all the studs and nuts.
I found various ebay sellers and bought from there. All inconel and i used the nuts with the split in the top that self lock. I also got some copper nuts but didnt use them as the split nut looked far superior...ill get the correct name an piccy in amo.

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Thanks Jon
You could be right on the pitch , it was a guess from my mate . I should have checked when I got home as I have some spare on the bench .
I know the inconel are expensive but removing the manifold is a pig of a job with a turbo mounted on top with all relevant hoses and pipes in the way . I’d rather spend the extra  Money and will probably but a new exhaust  gasket too as it’ll be up on my mates two poster for at least a week


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[boosted]

Yep i agree...when mine was off replaced all studs n nuts and been fine since. Dont use any exhaust paste...dont what that going through your turbo...

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[boosted]

So are we on the swap over to the red beast?

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[Mr Spiller]

https://www.ebay.co.uk/itm/STAINLESS-STEEL-M8-AEROTIGHT-NUT-AERO-NUT-LOCK-NUT-X-10-MOTORCYCLES-CARS-ETC/152566447541?hash=item2385ab3db5:g:FTgAAOSwHMJYGgrN

aero nuts are what i used bud...cant remember the pitch to be honest...But as Clives says its the heat that warps any mounting flanges...hence why i turned my boost down...as the blow on my turbos was flange warpage. Has it warped since mapping? or warped before?

other option is double nutting?

Thanks Jon
I’ll see if I can get the pitch found out now . This one is a car I bought half built so havnt touched the turbo or manifold .which is probably the only nut  and bolts I havent checked and had to tighten or change .given it was the wrong nuts on there and the state of the manifold gasket I’d say it’s been blowing a while . Pip mapped it and I managed around 15 laps over two easy sessions . We noticed the noise when I started  it for the third stint , tightened the nuts / bolts we could reach , which weren’t very tight . Still blowing a little so on the trailer it went


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[boosted]

Yep thats how my twins went... i used an angle grinder with a flap wheel on those old turbos i had to get a flat mating surface...been changed since.
Since got them perfect on a belt sander we have at work...as no way to bolt down on mill.

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[boosted]

That manifold critical to the turbo kit...have a google state side as im sure your not the only 1 to suffer this and a solution.

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[Mr Spiller]

So are we on the swap over to the red beast?

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Ha ha I honestly havnt got a clue , this one is pretty much same spec except for jap speed rear arms and super pro front bushes  which the red one has . The red one has been faultless for 5 years tho the engine is getting tired . https://www.flickr.com/photos/opentrack-track-days/48447192851/in/album-72157710074532097
So if this all works out with the blue one I’m tempted to stick a V8 in the red one


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[Mr Spiller]

So are we on the swap over to the red beast?

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Ha ha I honestly havnt got a clue , this one is pretty much same spec except for jap speed rear arms and super pro front bushes  which the red one has . The red one has been faultless for 5 years tho the engine is getting tired . https://www.flickr.com/photos/opentrack-track-days/48447192851/in/album-72157710074532097
So if this all works out with the blue one I’m tempted to stick a V8 in the red one


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[Mr Spiller]

That manifold critical to the turbo kit...have a google state side as im sure your not the only 1 to suffer this and a solution.

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It’s in being skimmed , no more than 3 mm I hope . It’s 13 mm before skimming


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[boosted]

Cool...your water and oil lines on flexy lines i hope? 
V8? lol

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