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1975 911s engine
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armi
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PostPosted: Mon May 02, 2022 9:28 pm    Post subject: 1975 911s engine Reply with quote
Hi there peeps i have a 1975 911s motor that orginally had 165hp but i have removed the old exaust and plugged up the thermo reactors on the heads i have replaced the cis injection with carbs and i installed headers. Does anyone know with the mods i have done what kind of hp i should be getting now?
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Starbucket
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PostPosted: Sat May 07, 2022 1:38 pm    Post subject: Re: 1975 911s engine Reply with quote
You don't say what carbs, are they 3 barrel Webbers?
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armi
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PostPosted: Sat May 07, 2022 10:46 pm    Post subject: Re: 1975 911s engine Reply with quote
Yes tripple weber carbs
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Starbucket
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PostPosted: Sun May 08, 2022 6:54 am    Post subject: Re: 1975 911s engine Reply with quote
The carb'ed motor was rated at 168HP so you will need performance exhaust to up your HP.
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armi
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PostPosted: Sun May 08, 2022 5:58 pm    Post subject: Re: 1975 911s engine Reply with quote
I have a set of heat exchangers on it.
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allaircooled
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PostPosted: Sun May 08, 2022 6:06 pm    Post subject: Re: 1975 911s engine Reply with quote
armi wrote:
I have a set of heat exchangers on it.


Which heat exchangers? It makes a difference. 74 and earlier where each side exits to the muffler, or the later kind where you only have one input to the muffler.
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armi
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PostPosted: Sun May 08, 2022 7:19 pm    Post subject: Re: 1975 911s engine Reply with quote
I have the early style.
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Starbucket
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PostPosted: Sun May 08, 2022 7:28 pm    Post subject: Re: 1975 911s engine Reply with quote
Get a Bursch Extractor Quiet Muffler to help those Webers breathe.
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armi
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PostPosted: Sun May 08, 2022 7:58 pm    Post subject: Re: 1975 911s engine Reply with quote
I do have the bursh muffler. So what kind of HP i should be putting out with this set up?
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Starbucket
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PostPosted: Mon May 09, 2022 9:07 am    Post subject: Re: 1975 911s engine Reply with quote
You are right around 180HP.
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armi
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PostPosted: Mon May 09, 2022 10:14 am    Post subject: Re: 1975 911s engine Reply with quote
Good 180hp should do well on my 914.
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Root_Werks
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PostPosted: Fri Apr 21, 2023 11:05 am    Post subject: Re: 1975 911s engine Reply with quote
Starbucket wrote:
You are right around 180HP.


With CIS Cams? Even though he has early exhaust, that seems optimistic for a 2.7 with Non S Cams.

Either way, a 2.7 will be a fun engine in a 914.
_________________
When I set my timing, why do I flush, then take a pee?
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[email protected]
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PostPosted: Sat Apr 22, 2023 10:33 am    Post subject: Re: 1975 911s engine Reply with quote
you will have to reset the cam timing for the cis 2.7 to run optimally with the carbs.
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