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Stock AU deck height and piston dish 

 

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 Post subject: Stock AU deck height and piston dish
Posted: Mon Nov 09, 2020 11:02 am 
Getting Side Ways
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Posts: 868

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

Has anyone measured a factory AU for deck height (or deck clearance) and piston dish?

My manual says a deck clearance of 0.0-0.3mm - presumably 0.3mm from the factory and allowing some material for decking the block on rebuild? Or is there actually a 0.3mm manufacturing tolerance?

Also, I have seen both 8.5cc and 10.0cc quoted for the piston dish. Which is correct?

I am putting an EF head on an AU bottom end (which I do not yet have, so I can't measure it). I need to work out how much to shave the head to get 10.0 compression, and these variations in deck height and dish make a big difference.

With my current 62.8cc chamber and AU MLS gasket, I get a compression ratio range of 9.38-9.77 depending on the actual deck height and dish volume. I need a bit more accuracy than that, or I could end up with 9.6 or 10.4 instead of the 10.0 I'm looking for.

Thanks for the help.

 

_________________

95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported 4-angled EF XR6 head, SS Inductions, Territory intake, 10:1 CR, Auckland 1258 cam, Coby headers, no cat, Tickford 2.5", 2850rpm stall, J3 chip

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