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Registered
Join Date: Jan 2005
Location: Los Angeles CA
Posts: 323
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Cast Iron Cylinder reuse & cam questions.
Hello.
I am about to rebuild my leaky 71 2.2 t motor and am considering stroking to 2.4 and swapping the cam. I have a couple of questions and have done quite a bit of research but am just soliciting some more opinions. I am looking for good street performance. Not a track car. Something with decent low end torque and power throughout the rpm range. I don't want a tweaky high performance motor. Just a great driver with more getup and go than the T has now. It will be driven infrequently, a weekend driver. I have had this car for 20 years and love it and want to give it the best as I plan to have it for the rest of my life. Here are my plans. Full rebuild. Stroke to 2.4 L with 2.7 crank. JE pistons in the 9.5:1 range. PMO carbs. MSD Ignition. I've gotten mixed opinions on whether to reuse or not reuse the cast iron cylinders. I have heard good things about the LN Engineering's "Nickies" but would rather not drop 3500 on P & C's if I don't have to. Cam Cam Cam. Many opinions on this. Most seem to say that a E cam is my best bet, some others say the S cam. What do you think based on what I said above? Thanks for everyones help.
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1971 911E 2.7RS interpretation -- Signal Orange baby! |
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Registered
Join Date: Feb 2004
Location: California
Posts: 926
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What RPM band do you want? The E will be good for off idle to 6000 and the S cam is 4500 and up.
The camshaft and compression ratio need to be matched, E cams with 9-1 and the S cams slightly more at 9.5-1. There are other cam options in between the E and S cams.
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John Dougherty Dougherty Racing Cams |
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You might look at 2.2 pistons. This would raise the cr quite a bit over the 2.4 stock cr. BTW, the 2.2E pistons used to come in an oversize.
Good luck, David Duffield |
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I'm not aware of any reasons not to reuse your iron cylinders except for the relatively small difference in weight -- which isn't a big deal for your application.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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Registered
Join Date: Mar 2004
Location: US
Posts: 1,621
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I would imagine the cast iron cylinders are less able to release their heat, and run hotter than aluminum counterparts. However, this might not be a problem area.
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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More cubic inches/centimeters = HP/TQ. Build the largest platform that your budget allows for.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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