MY view on Head Studs for the MZR

Sho said:
My motor does not have a keyed crank or pinned cams. Pretty much, it's a stock motor bored to 88mm with forged rods and pistons and oem everything else.
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Thanks for the info, man. Sounds exactly like what I'm going to do, but with 4032s. Mark has helped me to be entirely confident that the crapton of alky I'll be spraying (essentially 2,000-2,500cc or so) will be waaaaaay more than capable of keeping the 4032s happy. Heck, if it can keep OEM pistons happy, how much more so 4032s, which are almost as strong as 2618s, you know?
 
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Redline said:
Thanks for the info, man. Sounds exactly like what I'm going to do, but with 4032s. Mark has helped me to be entirely confident that the crapton of alky I'll be spraying (essentially 2,000-2,500cc or so) will be waaaaaay more than capable of keeping the 4032s happy. Heck, if it can keep OEM pistons happy, how much more so 4032s, which are almost as strong as 2618s, you know?
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Is there a head stud discussion in here somewhere that I'm missing?
 
Redline said:
IIRC, you guys said no pinned cams or keyed crank either, right? I don't think SP63 even does those services on their Stage 1 long blocks, but I could be wrong... Looks like they don't, though: http://www.speedperf6rmanc3.com/products/sp63-stage-1-built-long-block-for-mazda-mzr-disi.html
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Correct. Keying is more for insurance against assembly error.
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VTMongoose said:
Is there a head stud discussion in here somewhere that I'm missing?
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The OP?
 
VTMongoose said:
Is there a head stud discussion in here somewhere that I'm missing?
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Heads are being discussed - more than just studs now. Don't worry, it's normal for threads to evolve and then revert. And the OP is liking posts that don't even mention studs ;)
 
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Realgib3 said:
Nope, you're correct, we're just talking about two different things.

It is true, when testing distortion of the cylinders from a TQ plate, it showed that cylinders did not distort much at all, making it unnecessary to use a plate when boring/honing.

What I'm talking about here is the distortion of the cylinders under heavy load/cylinder pressure. More or less, the cylinders are "flexing" under extreme stress and causing a break in the seal of the head gasket. If you look at any of the very big power guys still on 10mm head studs, you'll notice they're also sleeved and are thus able to keep gaskets happy for a lot longer. From the factory, we have something like a 2mm sleeve, which is almost nothing, then most go to 88mm to get their cylinders round again and now you're down to only 1.5mm of iron trying not to flex at all under crazy stresses.
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Hate to bump an old thread but I have personally measured distortion in excess of .0015 in on a block honed with out a torque plate after installation of a torqu plate L19's torqued to 75ft/lbs. I would say mitigating that distortion by final honing with the torque plate installed and torqued with the same tipe of studs to be used at the final torque which is intended to be used is benifical. Just my 2 cents...
 
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