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				Cranckcase for stroke short 66mm...projet 2.5/2.9 block for 2.2T
			 
			hallo! its new and italian (my write englais its very poor..) I would like to know what the crankcases optimal for 66mm stroke engine. I seek one engine for street/small race (hp 200-250>). What the "popular" solutions? my idea: -stroke 66mm (S crankshaft?) (only 66mm.. I like the short stroke)) -heads 2,7 (S ?) -magnesium case (7R ?) (cilinder spigot bore?) -Weber or Pmo 40 -connetting rods Carillo -dual plugs -max bore for 2.7 heads? (87.5-89-90-92?) (mahle/LN with JE piston?) -compression ratio min 9.8/1 max 10.5/1 -cams for carbs (solex? ge 60/80?) -trasmission 901 (reinfosed mid plate) Thanks to all!!! danilo italy Last edited by dan67; 03-27-2008 at 10:38 AM.. | ||
|  03-27-2008, 10:32 AM | 
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| 3 restos WIP = psycho Join Date: Feb 2005 Location: North of Exit 17 
					Posts: 7,665
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			Best crankcase would be in this order: Early aluminum case 7R magnesium case For cylinders that large, I would not use anything magnesium earlier than 7R. I'd use any head from a 2.2 - 2.7 (they are basically the same) and use ports of at least 36mm, up to 38mm if you plan on using a GE60 cam. My choice would be to use DC40 cams, 10.5:1 pistons for dual plugs. You can get bigger than 2.5L on a short stroke crank, but costs go up significantly above 2.5L. The reason is that you will realistically need to use Nickie cylinders to maintain cylinder skirt strength; Nickies are very stable to 1mm thickness where standard Mahle cylinders are not. If cost were no object, a short stroke 2.7 built with on an aluminum case wit JE pistons and Nickies on DC40 cams would be one FAST and fun motor. 
				__________________ - 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 | ||
|  03-27-2008, 04:09 PM | 
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| Registered Join Date: Feb 2003 Location: chicago 
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			i'm going to build a similar engine for my 68. i'm going to use a mag 7r case with a counterwieghted 66mm crank. i think i will stick with 90mm mahles and 35-36 s port heads. the nice thing about the port sizes is that they are good for a street engine but when the displacement gets smaller they are good for a more race oriented engine and no actual porting is needed. i likely go with a ge60 type cam. not sure what the induction will be or wether to go twin plug or not.
		 
				__________________ BMW 128i 73 rsr clone - sold 68 912 project to become 911r (almost done!) | ||
|  03-27-2008, 04:32 PM | 
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			another question: All crankcases (alu or mag) series 2.0-2.2-2.4-2.7- (3.0 turbo very reinforsed?) its "adeguate" for stroke 66 mm (with heads 2.7) et trans type 901? | ||
|  03-28-2008, 09:34 AM | 
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			..the 2.7 heads accept diameter cilinder over 90 mm?
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|  03-31-2008, 06:30 AM | 
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| Registered Join Date: Feb 2003 Location: chicago 
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			the chamfer needs to be larger if you use 2.7 heads on a larger die. cylinder (92-93mm). most machine shops can do this when reconditioning the heads. don't skip this - without the chamfer there is a greater chance of detonation at the cylinder/ heat mating surfaces.
		 
				__________________ BMW 128i 73 rsr clone - sold 68 912 project to become 911r (almost done!) | ||
|  03-31-2008, 12:32 PM | 
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| up-fixing der car(ma) | 
			Another way to go .  I have a set of big port 39/35 911SC 3.0 heads.  And you could use a 3.0 Turbo case.  2.8L using 66mm crank.  Has bigger valves than 2.5L, would be cheaper than the 2.7 engine Kenik mentioned above.   Email me at KinderSport@gmail.com if you want to talk about the heads. 
				__________________ Scott Kinder kindersport @ gmail.com | ||
|  03-31-2008, 01:32 PM | 
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| 3 restos WIP = psycho Join Date: Feb 2005 Location: North of Exit 17 
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				__________________ - 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 | ||
|  03-31-2008, 02:01 PM | 
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				MFI Bosch Mecanical Pump 2.2E to 2.7RS
			 
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|  04-07-2008, 06:31 AM | 
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