 2.7 CIS to Carbs - how much HP loss? |
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| Scott S |
 Jul 2 2009, 03:15 PM
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Small Member  Group: Members Posts: 1,698 Joined: 30-April 03 From: Colorado Member No.: 633  |
Hi All -
Got a line on a rebuilt 2.7 out of a 1977 911S. It is 100% complete including the full CIS system. What kind of power loss would I experience if I stripped off the CIS and went with carbs? The motor is only 165hp to begin with... Thanks! Scott S |
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| pcar916 |
Jul 2 2009, 11:13 PM
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Is that a Lola? Group: Members Posts: 1,524 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None 
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When I bought my car it had a 2.7L motor built up to Bruce Andersen's 911 Performance Handbook spec's with 40 IDA carbs, headers, the proper cams, shuffle-pinned... everything except the Euro pistons. It had CIS. I wish I could give you numbers but never got that engine dyno'd. That said...
The car ran strong but I had to change jets often. Kind of a pain actually, and I'm sure I would have made more power with the proper pistons and more compression. How much is impossible to tell... But I wound up with a full set of jets and lots of experience balancing and jetting those carbs. Gave up all that when I traded away the motor for a 3.6L. Just make sure you have the 11 bladed fan, not the 5-bladed one, unless it's a track only car. I'm not near my books and don't remember what year those came on the 2.7 engine. That engine sounded great. |
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Posts in this topic
Scott Schroeder 2.7 CIS to Carbs - how much HP loss? Jul 2 2009, 03:15 PM
brant Scott,
I heard about that motor
seemed like a re... Jul 2 2009, 03:20 PM Cupomeat I cannot support the following with empirical evid... Jul 2 2009, 03:21 PM turboman808 From what I have seen on graphs you get peaks and ... Jul 2 2009, 03:46 PM carr914 I would think that you would H.P. & Torque wit... Jul 2 2009, 04:43 PM 9146986 Why not just keep the CIS? Jul 2 2009, 10:11 PM GeorgeRud If you don't have it, I would get Bruce Anders... Jul 2 2009, 11:29 PM ahdoman If the CIS is intact and working stick with it. Yo... Jul 3 2009, 12:10 AM carr914
When I bought my car it had a 2.7L motor built up... Jul 3 2009, 06:15 AM
pcar916
[quote name='pcar916' post='1188039' date='Jul 3 ... Jul 3 2009, 07:45 AM Project 6 Wayne at Pelican claims to have installed a CIS mo... Jul 3 2009, 07:50 AM J P Stein I know a few folks that run Webers on an otherwise... Jul 3 2009, 08:51 AM Gint I'd probably just use the CIS. But if you buy... Jul 3 2009, 08:53 AM scotty
I know a few folks that run Webers on an otherwis... Jul 3 2009, 10:28 AM naro914 I have a 2.7 in Huey at the moment, with Webers. I... Jul 4 2009, 10:56 AM Mountain914 Just want to throw this out there - since the titl... Jul 4 2009, 11:44 AM J P Stein
Just want to throw this out there - since the tit... Jul 4 2009, 01:38 PM ArtechnikA
A good illustration of the possibilities of the 2... Jul 4 2009, 02:02 PM J P Stein
A good illustration of the possibilities of the ... Jul 4 2009, 04:02 PM ArtechnikA
Yeah,yeah, some folks go all gaga over the MFI se... Jul 4 2009, 05:31 PM naro914 This is a good discussion....
I have carbs. I lik... Jul 4 2009, 04:14 PM J P Stein
This is a good discussion....
I have carbs. I li... Jul 4 2009, 07:12 PM 9146986 As long as the carbs are optimized for the engine,... Jul 5 2009, 11:18 AM |
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