 914-6 2.7 Euro RS Twin Plug Project, sleeper 914 with a twin plug surprise |
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| davehg |
 Nov 11 2023, 03:14 PM
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#81
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Member  Group: Members Posts: 205 Joined: 19-September 17 From: PNW Member No.: 21,443 Region Association: Pacific Northwest 
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QUOTE(BillJ @ Mar 23 2023, 11:39 AM)  Was curious why twin plug? RS pistons are low compression and twin plug will really provide no additional value to performance in that config. Twin plug is normally only on over 10.5 cr to ensure full ignition across a very domed piston. Its cool for sure but if a normal 2.7 RS then overkill. I was conflicted about whether to go high compression pistons or not. Ultimately, I went with Mahle RS pistons/heads and a Solex e-style cam to get more useable torque for the street. The twin plug thing was overkill - I love the sound, and I love the power on the top end over 5krpm - it just breathes better IMHO. My 74 911s 2.7 CIS always seemed to lose steam over 5k, which is why I'm transplanting the 2.7 MFI into that rebuild, similarly sporting a Daugherty 40 cam. I know I can wrangle more power going with higher compression pistons, but where the dollars to HP gain of high compression isn't spectacular (and our RGruppe Treffen drives include places that are scarce on higher octane fuel). My goal with both of these builds wasn't to build an all-out hot rod, but rather to get closer to a gentleman's touring version that fits the spirit of the original 914-six, with more scoot, good reliability, and livable HP. |
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| davehg |
Nov 11 2023, 03:58 PM
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#82
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Member Group: Members Posts: 205 Joined: 19-September 17 From: PNW Member No.: 21,443 Region Association: Pacific Northwest
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A sneak peek at the 74 911, which I'm calling a 911 RST (touring).
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1699739886.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1699739886.2.jpg) Narrow bodied. Period correct sport interior: (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1699739887.3.jpg) And a throaty, 2.7 MFI to be installed with a front fender mounted cooler. Like this blue car, a sleeper... (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1699739887.4.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1699739887.5.jpg) |
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| Cairo94507 |
Nov 11 2023, 04:34 PM
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#83
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Michael Group: Members Posts: 10,204 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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I love this build. (IMG:style_emoticons/default/beerchug.gif)
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| BillJ |
Nov 11 2023, 11:28 PM
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#84
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Senior Member Group: Members Posts: 1,254 Joined: 4-March 13 From: charlotte, NC Member No.: 15,610 Region Association: None
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QUOTE(davehg @ Nov 11 2023, 05:14 PM) QUOTE(BillJ @ Mar 23 2023, 11:39 AM) Was curious why twin plug? RS pistons are low compression and twin plug will really provide no additional value to performance in that config. Twin plug is normally only on over 10.5 cr to ensure full ignition across a very domed piston. Its cool for sure but if a normal 2.7 RS then overkill. I was conflicted about whether to go high compression pistons or not. Ultimately, I went with Mahle RS pistons/heads and a Solex e-style cam to get more useable torque for the street. The twin plug thing was overkill - I love the sound, and I love the power on the top end over 5krpm - it just breathes better IMHO. My 74 911s 2.7 CIS always seemed to lose steam over 5k, which is why I'm transplanting the 2.7 MFI into that rebuild, similarly sporting a Daugherty 40 cam. I know I can wrangle more power going with higher compression pistons, but where the dollars to HP gain of high compression isn't spectacular (and our RGruppe Treffen drives include places that are scarce on higher octane fuel). My goal with both of these builds wasn't to build an all-out hot rod, but rather to get closer to a gentleman's touring version that fits the spirit of the original 914-six, with more scoot, good reliability, and livable HP. Makes great sense to me! Great cars for sure. |
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| Root_Werks |
Nov 12 2023, 01:25 PM
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#85
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Village Idiot Group: Members Posts: 8,566 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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What a great build! Really turned out nice.
I like the sleeper look myself. (IMG:style_emoticons/default/driving.gif) |
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| TRS63 |
Nov 14 2023, 10:36 AM
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#86
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Member Group: Members Posts: 326 Joined: 14-September 20 From: Germany - Stuttgart Member No.: 24,690 Region Association: Europe
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What a fantastic car and it must be awesome on the roads with this engine !
Thanks for sharing ! Antoine |
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| DRPHIL914 |
Nov 15 2023, 01:42 PM
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#87
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Dr. Phil Group: Members Posts: 5,813 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(davehg @ Jan 16 2022, 01:31 AM) Long time since I’ve upgraded the thread. Motor is in the car and transmission rebuilt with a Wavetrac LSD and tangerine racing shift rod kit. Oil lines complete, and the focus is now turning to finishing the interior. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314674.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314675.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314675.3.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314675.4.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314675.5.jpg) Note Ben’s heat exchangers and muffler (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314676.6.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314676.7.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314676.8.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1642314676.9.jpg) WOW so awesome, its a car that would be at the top of anyones list to own for sure!! I totally agree about your assesement that this is the embodiement of what a 914-6 RS may have looked like or become if they had been able to continue to produce a /6 version of an RS car. 6 years of meticulous work and patience has paid off! Thanks for sharing |
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| davehg |
Jun 25 2024, 09:56 PM
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#88
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Member Group: Members Posts: 205 Joined: 19-September 17 From: PNW Member No.: 21,443 Region Association: Pacific Northwest
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A few more tweaks now that I am past the break in.
Swapped in the JWest Rennline shifter. Combined with the Tangerine Racing shift rod kit, it eliminated the 901 “stirring oatmeal” shift feel and I’m in love with how crisp the shifter is. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1719374162.1.jpg) Upgraded the master to a 23mm and it firmed up the pedal perfectly. The GT style fuel gauge isn’t accurate. Stumbled on a nice trio guage and will upgrade that along with a euro Speedo. The engine pulls hard but at about 5500rpm it feels a tad lean. Bernie is going to play with jetting to see if we can richen it up at top. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1719374162.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1719374162.3.jpg) |
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| davehg |
Jun 25 2024, 10:02 PM
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#89
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Member Group: Members Posts: 205 Joined: 19-September 17 From: PNW Member No.: 21,443 Region Association: Pacific Northwest
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For fun, also showing its stablemate that is now complete. The RS 2.7 MFI is wonderful to compare to the twin plug 2.7. It utterly transforms the 911s and I’m in love with the torque and instant hot of the MFI.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1719374532.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-21443-1719374532.2.jpg) |
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| colingreene |
Jul 9 2024, 11:37 AM
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#90
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Senior Member Group: Members Posts: 733 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
Rather than speculating that it "feels lean"
why not put a wide band oxygen sensor in it and see what its doing. I have found that's a really nice way to get things dialed in properly. |
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