Page 4 of 5 FirstFirst ... 2345 LastLast
Results 31 to 40 of 41

Thread: 2.4E to 2.7RS spec

  1. #31
    Senior Member
    Join Date
    Jul 2006
    Location
    Corvallis, OR
    Posts
    2,547
    BTW, Mahle has teamed up with L&N engineering to make a matched set of 2.8L P & C's. The best price I could find on them was from RM European for $5600.00. Then you might as well get new cams, port and twin plug the heads, get new Pauter light weight rods, and on and on it goes. Then if you're doing all that you've got to do short gears 2-4 in the transmission! See, I'm a bad influence. But, there's nothing like driving an early 911 with real horsepower and short gears.
    72S, 72T now ST

  2. #32
    Senior Member
    Join Date
    Nov 2008
    Location
    Finland
    Posts
    241
    I actually asked Mahle guys in Stuttgart Retro Classic last weekend why Mahle doesn't make higher comp 2.7 or 2.8 cylinder + piston sets, but unfortunately no proper answer. Especially for european customers that LN Nickies + JEs set is over twice the price of new Mahle 90mm RS cyl+piston set.
    I was just reading today that some don't recommed boring std 90mm Nikasil cylinders to 92mm as there will be too little material left especially around sealing ring. I thought boring cylinders to 92mm and re-plating them would be good choice but those discussions doesn't support that. Luckily I still need to finish other car before thinking hot 2.7 or 2.8 engine too much...
    - Ville -

    1967 911 Slate Grey/red, fully restored + 66' "r-ish" hotrod project

  3. #33
    Senior Member
    Join Date
    Jul 2006
    Location
    Corvallis, OR
    Posts
    2,547
    Yes, that's what nice about the new LN 92mm cylinders they're not thin from boring. They're made new from scratch but will cost you some scratch. Ask me how I know.
    72S, 72T now ST

  4. #34
    Senior Member
    Join Date
    Nov 2003
    Location
    Santa Monica CA
    Posts
    2,041
    What about the stress from a monster engine of a 2.8 is on the Mag case? I have herd that if you rev too high, you could break the crank or the fly wheel come loose. One engine builder showed me a Mag case 2.8 that cracked but it was a race car. Chris
    1. Chris-Early S Registry#205
    2. '70 911S Tangerine
    3. '68 911L Euro Ossi Blue

  5. #35
    Senior Member
    Join Date
    Jul 2006
    Location
    Corvallis, OR
    Posts
    2,547
    Yeah, I've never seen that on a street hot rod. The case of course is sent out to get all the mods and shuffle pinned. People would make the mistake of putting in the high compression P & C's in with stock heads which would raise the compression even higher and that's where most the bad rap has come from on the 2.8. A 2.8 is a fantastic engine when built right. If you want even more HP then by all means go to the 3.0 Aluminum case.
    72S, 72T now ST

  6. #36
    Senior Member
    Join Date
    Jun 2014
    Location
    Norcal
    Posts
    161
    You might consider buying another used 7r 2.7 case because probably csn’t bring case back to stock if you increase the spigots for the wider cylinders.

  7. #37
    Member
    Join Date
    Nov 2004
    Location
    Alberta, Canada
    Posts
    81
    Not sure I want to go through the effort of sourcing another case and then storing my current numbers matching 7R one. I realize punching out the spigots is irreversible but it seems the value of properly modded early cars isn't really affected if I do sell it in the future. I'd keep the MFI, reasonable CR and single plug.

    For a Sunday driver, what case mods are recommended (e.g. shuffle pinning, studs, etc)? Unlikely I've ever do a track event with it. That's what racecars are for

  8. #38
    Senior Member swisscheese's Avatar
    Join Date
    Jan 2003
    Location
    The Netherlands
    Posts
    386
    High compression pistons are available from Wahl Kolben:in Fellbach (close to Mahle) southern Germany. They use the same blank forgings as/from Mahle. And why not source another 7R case? 1977-up has the mag-cases with wide spigots and oil by-pass. I'm sure the extra expense of the case will pay-off, when selling the car with unmodified numbers matching (is that the case (pun-intended) here?) case.
    911S 1973
    Early 911S Registry #176

  9. #39
    Member #226 R Gruppe Life Member #147
    Join Date
    Feb 2009
    Location
    Portland, Oregon
    Posts
    2,343
    I didn’t want to alter the original 2.4 in my S, so I gathered parts and built a RS spec 2.7. I switch them every few years along with a special ratio gearbox. Piece of cake.
    Attached Images Attached Images   

  10. #40
    Senior Member
    Join Date
    Oct 2010
    Location
    Southern Ca.
    Posts
    1,166
    A 2.7 with higher compression pistons will be close to the 2.8 . Follow swisscheese's link . The biggest factor for the 2.8 engine is the higher compression ratio , not the displacement increase .

Similar Threads

  1. Italian Spec vs US Spec 911S?
    By 73ess in forum General Info
    Replies: 10
    Last Post: 01-14-2014, 03:10 AM
  2. Need spec details of 1968 Euro (ROW) S vs. US-spec 1968 S
    By Peter Linsky in forum General Info
    Replies: 9
    Last Post: 10-20-2011, 03:23 PM
  3. 28.5 MPG with a 2.7 RS Spec MFI?
    By RickS in forum General Info
    Replies: 5
    Last Post: 12-25-2008, 07:01 PM
  4. MFI spec.
    By Zithlord in forum Technical Info
    Replies: 4
    Last Post: 04-10-2008, 10:42 PM
  5. F/S 73 911 2.7RS Spec.
    By Bobby Smith in forum For Sale/Wanted: Early 911 Cars, 1965 - 1973
    Replies: 25
    Last Post: 06-30-2006, 10:48 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.