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2.7 rebuild
Wayne
Well I think I'm going to stick with my 2.7 rather than go the 3.0L route. I your book you don't quote any HP figures for the 2.7 engines. What do you thing I can get with 9.5 J&E pistons, webers, some head work and european headers into a 2in/2out M&K muffler? I've heard of several different cam choices. What would you recommend for a street/autox/track application hoping for 220-230HP in a 2200 lb car? Kent Olsen 72T coupe
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Kent Olsen 72 911 SCT upgraded 3.0L McMinnville, Ore |
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
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Need more input...carbs ,cis , F.I. Turbo???????/
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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Join Date: May 2003
Posts: 3,346
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Mod S cams with aftermarket valve springs or Solex cams with stock valve springs. 36mm ports, 230 HP with either one.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,711
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Kent,
There is a decent thread, running right now on the technical forum, regarding rebuilding 2.7's for streetable power. A lot of discussion regarding cam choices, etc. The combo that you are mentioning. (2.7 with Webers, headers, 9.5:1 JE's, etc.) is a popular combo. I have this combo with E-cams currently installed in my 77S. Goes good and makes very nice noises. There are a couple of other engines shown, a great video w/sound and a dyno sheet showing 240hp with a similar setup. Seems high, but since the 2.7RS was spec'd at 210HP at 8.5:1, I guess a high-comp version should be somewhat higher. I think that waynes book was quoting 220-230 for the 2.7RS high comp recipe and that's what I was hoping/shooting for. Good luck with your project. Go check out that link.
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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Join Date: Jul 2001
Location: mt. vernon Wa. USA
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2.7 rebuild
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ Last edited by al lkosmal; 01-08-2008 at 09:03 PM.. |
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Join Date: Aug 2004
Location: G.R. Mi.
Posts: 225
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Here is a video of my 76 911s with webers, J&E 9.5:1 cr with dc40 cams with all the upgrades done to the case and a M&K exhaust
Runs real well http://youtube.com/watch?v=uTg8NnnY2cY
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Denny 1976 911s targa 1974 widebody G2 style GroupeB 76 www.G2Performanceshop.com Cylinder head recon, case savers,twin plug,rocker arms |
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abit off center
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How did you catch and stay with that Carrera S, who was driving that?? Was that when your throttle was only opening 3/4 the way??
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. Last edited by cgarr; 01-09-2008 at 11:43 AM.. |
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Join Date: Oct 2005
Location: O-side California
Posts: 157
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what spark plugs would you use in such a motor?
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O22$pa 70 porsche 911t 52 mgtd |
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Join Date: Aug 2004
Location: G.R. Mi.
Posts: 225
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I use a cooler plug, but then I have tried several heat ranges and now with the motor haveing 4000 mi. on it, they are burning just fine with the lower heat range.
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Denny 1976 911s targa 1974 widebody G2 style GroupeB 76 www.G2Performanceshop.com Cylinder head recon, case savers,twin plug,rocker arms |
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Location: O-side California
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could you share the specific # and brand?
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O22$pa 70 porsche 911t 52 mgtd |
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Join Date: Aug 2004
Location: G.R. Mi.
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I started with the stock plug and ran it for a 100 mi and checked the color. Alittle dark but it should of been since I was running a little rich. After the engine was broke in and different jets I went to the next heat range cooler and that seamed to burn the best, a light brown. But a lot of it depends on your jetting and carb setup. I use NGK but right off hand I don't know the number is. This motor that I built is just mildly modified. HP, I don't know but one thing I can tell you it made the car fun to drive no lack of power!
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Denny 1976 911s targa 1974 widebody G2 style GroupeB 76 www.G2Performanceshop.com Cylinder head recon, case savers,twin plug,rocker arms |
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Join Date: Mar 1999
Location: Vancouver,Wa.
Posts: 4,457
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I'm a big fan of the Solex grind for a 2.7L with carbs.
With 9.7:1 compression, I started with NGK BP7es but switched to BP6 s which didn't foul as often.....I run the motor rich. I'll get some chassis dnyo numbers off this latest rebuild only because it's going on one for break-in......and an AF reading.
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JPIII Early Boxster |
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Quote:
They call him...the Bling! ![]()
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Michael Sans Porsche...for now 2009 Mazdaspeed 3 Grand Touring daily driver / DS autocross toy 2010 Subaru Forester X Limited - wife's daily driver |
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Loose nut bhind the wheel
Join Date: Dec 2005
Location: Durham, NC
Posts: 262
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I resemble that comment except I only take my coffee black and the blue tooth is for street use only.
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Ed 1970 911S Targa 2.7RS MFI dual plug 10.5:1 1974 260Z SCCA ITS 1998 M3 |
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