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CIS to Webbers
I just bought a 2.2 liter that's been sitting for a long time. It has 40 IDA's on it (that will need to be rebuilt). Anyway, I'm wondering if I can put them on my CIS 2.7, which has supposedly been bored to a 2.9.
Arey they too small? Do I need to change anything else? T.I.A. Chad
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"I understand that you want to drive fast, it's just that I want to go faster!" Move ova please  Chad aka "Chili" 1974 Base coupe in Carrera outfit. No A/C, no Sun Roof, no power windows. Fast and light, just the way I like it. (Sad to say, it's sold. But at least it remains with us on this board.) My car http://www.pelicanparts.com/gallery/CHILI 1969 RSR Project. Heavy on the word PROJECT! No pictures yet. Keeps breaking lenses of cameras. |
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12-02-2007, 04:42 PM
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I have a 75 2.7 with 40ida's with stock cis cam and original pistons but with ssi's and a 73 rs exhaust.You won't get a huge hp gain(15 hp) without changing out the p&c's and cam but you will gain a lot of throttle response and great sound.
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Brent Lineker 1975 911S weber conversion. |
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12-02-2007, 07:23 PM
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Join Date: Mar 2005
Location: Auckland New Zealand
Posts: 58
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I went from CIS to Weber 40IDA's on my 3.0 litre engined '74 Carrera and couldn't be happier. You will need to dyno tune your engine after going to Webers. I found around 25hp with Webers, headers and 2 in 2 out exhaust. My car has to be road legal but is basically a full on track car but is very drivable on the road. I still have the stock SC cams and pistons which will go when I freshen the engine. Go for it!
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12-02-2007, 08:20 PM
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Hey New Zealand,
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'65 911 Coupe (301278) |
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12-03-2007, 03:23 PM
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Hey New Zealand - Again,
Sorry about that. Hit the wrong button. Anyway, just curious if you have to trouble with air pollution crap on your cars. Regards, Jerry Weiland
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'65 911 Coupe (301278) |
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12-03-2007, 03:25 PM
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Thanks for the response guys!
Yes, I already have SSI's and the motor I bought also has the old school 2 in 2 out, so I'm going to run that, too. I love that look. To be honest, i didn't think I would gain hp. I just like the look of carbs. There's so much more room in the engine compartment and the look is a lot cleaner. I will also have it dyno tuned (which I never did with the CIS, but I should have). I can't wait! 
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"I understand that you want to drive fast, it's just that I want to go faster!" Move ova please Chad aka "Chili" 1974 Base coupe in Carrera outfit. No A/C, no Sun Roof, no power windows. Fast and light, just the way I like it. (Sad to say, it's sold. But at least it remains with us on this board.) My car http://www.pelicanparts.com/gallery/CHILI 1969 RSR Project. Heavy on the word PROJECT! No pictures yet. Keeps breaking lenses of cameras. |
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12-03-2007, 04:00 PM
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Join Date: Mar 2005
Location: Auckland New Zealand
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Chad - yes Webers installed definitely look cleaner and my car seems to run a bit cooler but that might be just part of the whole package with less stuff in the engine compartment and better breathing from the exhaust system. I dyno'd the 3.0 with CIS and then after the Webers were installed for a while and when I went to headers - it is the throttle response that is real handy at the track.
Jerry - no we don't have issues with air pollution crap on our older cars. The green brigade want to bring it in though! |
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12-03-2007, 07:11 PM
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1974 Porsche 911 2.9
1968 Porsche 911 Coupe 2.2L
