 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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| GeorgeRud |
Jul 2 2009, 11:29 PM
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
If you don't have it, I would get Bruce Anderson's book and follow his advice on the 2.7 motor. I have one with the RS piston/cylinder set, E cams, and the Weber carbs. It runs very nice, and certainly has more power than the CIS system, which used a very mild cam (210 if Anderson is correct in his figures). A wilder cam will give you a higher peak hp, but at the expense of driveability.
I think that if you put on a modern, electronic fuel injection system (ie Bitz Racing with the Megasquirt controller), you could do better than the carbs as they are really not all that happy with today's gas formulations, and the EFI should have better control. If the engine is complete and working, you can always use it that way initially, and always modify it later if you wish. Even 165 hp in a 914 is a blast to drive. |
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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 pcar916 When I bought my car it had a 2.7L motor built up ... Jul 2 2009, 11:13 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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