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Registered
Join Date: Jan 2009
Posts: 168
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2.4L JE Piston orientation
Hi, starting assembly of my 73.5 CIS 2.4L T engine and need advice on my JE pistons orientation. The valve reliefs are cut offset from each other and different sizes. I think the larger cutout is the Intake side but want to be sure.
I am running a hotter cam as well and will conduct the clay assembly measurements as well as the timing and disasssmly again to assure proper valve clearance. 
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12-06-2022, 01:12 PM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,690
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The standard for 911 pistons is larger relief is for the intake valve. So larger relief is the upper one.
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12-06-2022, 03:27 PM
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you will notice a very sharp edge around the valve relief edge
make sure you round this off , give it a radius , no sharp edges ! they will make hot spots . all sharp edges Piston deck height @ 1mm , work like crazy to get this clearance Ian
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Kermit, 73 RS clone, Just Part of the Team Chris Leydon ,Louis Baldwin ,Peter Brock ,Riche Clark Jerry Sherman ,Rob McGlade ,Donnie Deal Hank Clarkson ,Craig Waldner ,Don Kean ,Leroy Axel Gains |
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12-06-2022, 05:43 PM
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