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Join Date: Jan 2005
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Turbocharge a CIS 2.7

May be an old subject, but does anybody still make a kit for a CIS 2.7 motor like they did some 20 years ago?
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Old 11-29-2009, 02:20 PM
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I dont think so but some have done it DIY. I would suggest scrap the CIS and go EFI and you will need an ignition that will give you boost retard the stock 2.7 dizzy wont do you any good there.
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Old 11-29-2009, 03:08 PM
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The 2.7 unless rebuilt is not a stable platform. Personally I would start with a 3.0. The cases on the 2.7 require a lot of work to become reliable
Old 11-29-2009, 04:29 PM
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Quote:
Originally Posted by Porschephd View Post
The 2.7 unless rebuilt is not a stable platform. Personally I would start with a 3.0. The cases on the 2.7 require a lot of work to become reliable
You can always take the safe route aw heck whats the fun in that! I did my conversion on a 2.7 mostly to learn how to tune the EFI and learn how to tune a turbo motor. In all honesty I will be putting together a 3.2 short stroke motor in the very near future and I will be very intrested to tear this motor down to see what adding the turbo did to it. My case had all the mods done to it so I am confident the case will hold together and I had a recent upper end done on this motor so the only real concern I have is preventing any detonation so I dont hole a piston. That is why I said that about the dizzy and using EFI over CIS as you will have the ability to tune the air/fuel ratios and if you go with a tuneable ignition (I went with EDIS controlled by my EFI computer) you stand a chance at a fun little motor I have had a blast driving mine it has good response off boost and when then the boost kicks in well it is a kick in the pants I would like to work it out so the boost comes in a little smoother but that will be the other motor. The jist of this ramble is you can do it it will be fun but I feel like I am rideing on a ticking time bomb although I would like to see my motor go the distance till I can get the other one built but it is a crap shoot. Good luck.
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" Porsche there is no substitute" I always liked that saying. Air cooled is the only way to go!
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76 Blazer also restored by me
Old 11-29-2009, 04:49 PM
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Quote:
Originally Posted by Porschephd View Post
The 2.7 unless rebuilt is not a stable platform. The cases on the 2.7 require a lot of work to become reliable
Tell me about it - my turbo build is using a CIS 2.4T 7R case and required just short of $3K in case work to be a truly reliable platform for my small bore turbo.

Personally, I wouldn't turbo a 2.7 since I feel that the smaller spigots of the 2.4 mag case is paramount for reliability. After all, this is the case the 2.1RSR turbo used.

Any aluminum case is a MUCH better starting point, so if you want to build a mag case turbo, you'd better user really low boost or have a purpose for using one.
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Old 11-30-2009, 10:08 AM
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