72 2.4, flat six |
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72 2.4, flat six |
CG-914 |
Sep 1 2013, 03:03 PM
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#1
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Member Group: Members Posts: 326 Joined: 27-December 10 From: LA/OC CA Member No.: 12,526 Region Association: Southern California |
Me and my dad are rebuilding a 72 2.4 engine.
They are some wired things going on with the parts in the engine so here are some facts and questions about them. We are rebuilding the engine but also want to modify it. Maybe different cams and make it a 2.5…. Engine Case 901.101.101.5R Heads [Date?: 4x 72 + 2x 71] 911.104.306.OR [K 1819g] Valve Intake 45 mm Valve Exhaust 30 mm Intake 37.5 mm Exhaust 36 mm The Intake ports are bored out. With that size are they even useable? also in regard of the plans? Are the valve sizes stock? Cylinders [Mahle] 90 ZN 2 W6 [5x] 90 ZN 2 W5 [1x] Diameter 84 mm Total Hight 120 mm Pistons [3 Piston Rings] Hallmark 1: 83.95 [84 mm] Hallmark 2: Sp 0,05 Are these the stock cylinders? Cam Housing 901.105.111.OR Stock? Cam left 901.105.183.OR [965?] right 901.105.110.1R Here it gets wired. With Wayne Dempsey's great book, I think this is a S and a L cam out of two different engines. Was that something a lot of people did? Also the wear marks on them are pretty bad: See pics Then the question about the 2.5 liter engine set up. I understand, that they are two versions: 1: 2.7 liter as a high stroker 2: 2.4 liter with bigger bore. With rebuilding a 2.4 what are our options to build a 2.5 exactly? With what consequences? What needs to be changed/machined accordingly? With that in in mind what cams are best? As I read and heard the S cams are the best with now further consequences like taller intake manifolds?! Is there a great article about 911 Cams, they characters and consequences? Thank you guys! |
JmuRiz |
Jan 17 2014, 07:53 AM
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#2
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914 Guru Group: Members Posts: 5,433 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region |
2.2s in a 2.4 was an old hot-rod setup, because there weren't many options.
My brother is spec'ing out a 2.4 rebuild too. He talked with Henry at Supertec, he suggested his 2.45 engine build, I can dig up the specs later today if you like (or search for it on the pelican engine builder forum). Edit: found the correspondence - It is basically a 70.4 stroke x 86mm bore. Slightly under 9.5:1 compression and use a DC "mod S" cam. These engines make great torque while still producing 180 hp at the wheels @ only 6500 RPM. The only other modification is a 36 mm intake port. Btw, I think he strips and re-coats the pistons with nickasil |
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