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#21
03-05-2016, 03:28 PM
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Re: Raw Casting ZL-1 Block
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: marshall</div><div class="ubbcode-body">Another interesting fact i came across by one of mould making engineers at a casting facility quite a while back,was that they did not use steel liners in the bores of the Mclaren cars,they had the forged piston iron plated.I thought he was crazy but came to find out it was true.Thanks marc. </div></div>
Yea this is amazing isn't it... I was in awe when I found out as well!
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#22
03-05-2016, 10:46 PM
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Re: Raw Casting ZL-1 Block
When does Bergy's book come out. Bruce's vast knowledge of the engine casting process and Tonawanda engine plant would be a great read.
Marty
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#23
03-06-2016, 01:41 AM
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Re: Raw Casting ZL-1 Block
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: firstgenaddict</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: marshall</div><div class="ubbcode-body">Another interesting fact i came across by one of mould making engineers at a casting facility quite a while back,was that they did not use steel liners in the bores of the Mclaren cars,they had the forged piston iron plated.I thought he was crazy but came to find out it was true.Thanks marc. </div></div>
Yea this is amazing isn't it... I was in awe when I found out as well! </div></div> I believe the block alloy was Reynolds 390 (same as Vega), and they did run without iron sleeves. I believe (but not 100% certain) that production Porsche 928 blocks were the same alloy and they also did not run sleeves. Click on link and read this old newspaper article from 1971 where the McLaren team said the aluminum cylinder walls wore LESS than iron cylinders. https://news.google.com/newspapers?n...2868&hl=en
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#24
03-06-2016, 10:53 AM
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Re: Raw Casting ZL-1 Block
Walls SHOULD wear less than iron. The silicon precipitated out of solution before the matrix aluminum solidified; leaving lots of extremely hard silicon nodules. After the bores were machined, the walls were etched to eat away the aluminum matrix and expose the silicon nodules. So, the piston rings actually contacted the silicon & not the aluminum.
That's the Cliffs Notes version - it's a little more complicated. I worked with Jon Jorstaad (Reynold's chief metallurgist) in development when I was at Warren R&D. Also interesting that we received the aluminum in LIQUID form at the Messina plant.
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#25
03-08-2016, 03:36 PM
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Re: Raw Casting ZL-1 Block
It would be nice to see if the seller would disclose what the buyer is going to do with this block. With CanAm cars being so valuable, I have to wonder if someone is buying this as a backup block to be machined later. I have to wonder if machining it could be easier now with wetliners (spun cast) being out there. Just plain curious.
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