 72 2.4, flat six |
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| 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!     |
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| totle |
Jan 17 2014, 06:44 AM
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Newbie Group: Members Posts: 43 Joined: 18-October 10 From: Norway Member No.: 12,280 Region Association: Europe |
I have kind of same setup.
Trying to figure out my engine spec. I have same cylinders as you 90ZN2, but they are as well 84mm 2,2S pistons. Do you have more info of the cylinders? |
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| sixnotfour |
Jan 17 2014, 08:09 AM
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#3
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914 Wizard Group: Members Posts: 10,434 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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QUOTE(totle @ Jan 17 2014, 04:44 AM)  I have kind of same setup. Trying to figure out my engine spec. I have same cylinders as you 90ZN2, but they are as well 84mm 2,2S pistons. Do you have more info of the cylinders? one more time; Mahle for about 8yrs ? uses the 90mm casting and does the 84mm bore and they are Nikasyl coated inside |
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Posts in this topic
CG-914 72 2.4 Sep 1 2013, 03:03 PM
kg6dxn I don't know enough about flat sixes but those... Sep 1 2013, 04:24 PM ConeDodger This is a question for Jeff "The Hammer... Sep 1 2013, 04:40 PM Cap'n Krusty I think Jonathan at GPR is building a 2.5. Seems ... Sep 1 2013, 05:40 PM sixnotfour those heads should have 46 intake and 40 exhaust v... Sep 1 2013, 05:43 PM sixnotfour 2.7 with a 2.2 crank is a cheater 2.5 at 2519 Sep 1 2013, 05:45 PM GeorgeRud If it started life as a 2.4, you already have a lo... Sep 1 2013, 06:54 PM sixnotfour INHO the best autocross motor is a 2.4 S with sole... Sep 1 2013, 07:27 PM CG-914 I dont know what crank and rods are in the case ye... Sep 1 2013, 07:36 PM sixnotfour looks like you may have a class specific built mot... Sep 1 2013, 07:56 PM
CG-914
looks like you may have a class specific built mo... Sep 1 2013, 08:03 PM sixnotfour 84P8 are 2.2S pistons
Mahle for about 8yrs ? u... Sep 2 2013, 06:37 AM sixnotfour http://www.elgincams.com/
http://www.webcamshafts... Sep 2 2013, 07:00 AM JmuRiz 2.2s in a 2.4 was an old hot-rod setup, because th... Jan 17 2014, 07:53 AM |
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