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intake insulators on the carrera motronic?
I noticed in the parts diagram that the 3.2 intake uses the phenolic insulators much like the carbs. I am converting a CIS engine to the Carrera intake. Do I need to use the insulators or is this just a case of German over-engineering?
Thanks, Jim S.
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03-19-2008, 04:33 PM
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You should use them as they also have a cut out in them to help the injector clear the head. They are cheap to boot!
Cheers
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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03-19-2008, 06:33 PM
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thanks Jeff.
Another question...are the intake studs for the CIS runners sufficient length for the Carrera flanges and the insulators? Jim S.
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03-20-2008, 02:34 AM
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I go both ways on this. A phenolic block is a fantastic insulator, so now all the heat in the head it kept in the head and cannot migrate to the intake. The intake is usually a piece with a very large surface area that can radiate out heat, why trap all the heat in the head when you can move it upwards to the intake and let it out of the motor? I have seen old school vintage star mazda cars run in 90 degree ambient and freeze up the intake at idle. These are old school rotary motors with alu intakes and weber carbs, they freeze about 1/4 inch off the block all the way up to the trumpets. I dont think you need phenolic blocks on a 911 motor.
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03-20-2008, 10:15 PM
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Quote:
I don't know how thick the CIS or Motronic runner flange is, but I have a custom intake on my carrera engine with insulators and an 8 mm flange. With that in place the studs are long enough for 2 nylock nuts.
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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03-21-2008, 03:58 AM
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Kid962 / Magnus,
Thanks for the info. Looks like I need to spend some more time thinking this through. Jim S.
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03-21-2008, 12:36 PM
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I think someone has the insulators on eBay fairly cheap for both CIs and Carrera Intake
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03-21-2008, 02:36 PM
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Thanks North Coast. I'm tracking the ebay option.
Safe...do you know which length studs are on your engine?
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03-23-2008, 07:05 PM
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Quote:
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
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03-24-2008, 09:03 AM
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Thanks Magnus!
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I say we take off, and nuke the site from orbit. It's the only way to be sure. 2009 Cayman |
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03-24-2008, 12:15 PM
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1974 Porsche 911S 1978 3.0 SC
1977 Porsche 911 Targa 2.7s
1984 Porsche 911 3.2
