Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
JED
 
ARCSinAK's Avatar
 
Join Date: Jul 2009
Location: Hawaiian Islands/SV Idaho
Posts: 1,509
Garage
Engine number question 74 911S targa

I read some of the older posts on decoding engine numbers and wanted to inquire about help with a 74 911s targa.

Engine number *6144599
VIN #911 4 10 2692

The deck lid says 911S but I checked the engine number in bruce's re-build book for 1974 and it was a little vague. Said also seen with 30/32 intake exhaust ports. I am assuming there was just one version of the 1st generation 2.7 CIS motors installed in impact bumper cars, rated at 150 HP with 32/33 ports. Was it not until 1975, that porsche had a base 911 2.7 and a S engine versions for the USA? Base rated HP at 150 and S rated at 165, most likely due to the larger 35/35 ports.
This car does have a 11 blade fan and has the 74 exhaust with out the head build up issue that occurred in 75 with the addition of more emissions regulations. Was it not until the mid year when the 5 blade fans were used?

Any information you may be able to provide would be great.

Thank you


Last edited by ARCSinAK; 07-01-2013 at 12:53 PM..
Old 07-01-2013, 12:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
procan's Avatar
 
Join Date: Jan 2012
Location: West Texas
Posts: 305
Garage
My '74 911S targa has it's numbers matching engine and 11 blade fan, as well as heat exchangers.

VIN#: 9114310811 (911 - 1974 - 911S 2.7 CIS - Targa - 0811)
Engine #s: *6342564* (911/93)

I think Wayne's engine building book has port size numbers.
__________________
1969 Porsche 912/911E Hotrod - Light Ivory
2003 D2 Audi S8 - Black (DD for the snow!)
1974 Porsche euro 911S Targa - Grey (Sold! Off to the Netherlands!)
Old 07-01-2013, 03:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
JED
 
ARCSinAK's Avatar
 
Join Date: Jul 2009
Location: Hawaiian Islands/SV Idaho
Posts: 1,509
Garage
Yes Wayne's book has the port sizes there seems to be two possible sizes, I was looking for more info in regard to the engine number and differences between the base 74 911 and the S. what my engine numbers HP rating is.
Old 07-01-2013, 06:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
47silver's Avatar
 
Join Date: Sep 2002
Location: Pittsburgh
Posts: 3,039
Garage
from what i can see

Porsche 911 Fahrzeugidentifikation
and waynes engine book.
614 = 911 engine type 911/92 valves 46/40, ports 32/32, hp =150
634 = 911S + us Carrera engine type 911/93 valves 46/40, ports 35/35, hp = 175
__________________
1975 911S Targa
Silver Anniversary Edition

Last edited by 47silver; 07-01-2013 at 08:28 PM.. Reason: data
Old 07-01-2013, 08:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
JED
 
ARCSinAK's Avatar
 
Join Date: Jul 2009
Location: Hawaiian Islands/SV Idaho
Posts: 1,509
Garage
Thanks 47 Silver, looks like a possible re-badge. Do you what other changes the motors had to generate 25 HP beside the valve ports?? Seems like a lot with out other changes Cams ect. Has anyone discovered that a engine number may not match the heads on a original motor, un altered? Guess Im grabing at straws when the VIN all say 911. Did they offer a S car with a lower HP motor in 74?

Last edited by ARCSinAK; 07-01-2013 at 09:17 PM..
Old 07-01-2013, 09:13 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
Join Date: Jul 2008
Location: Spokane WA
Posts: 585
Interesting.... I, too have a 74 911S Targa. The engine has been rebuilt in the past and appears to be a stock 2.7 with heat exchangers and 11 bladed fan. I referenced the above link to decode the engine number but it is completely different from any of the listed numbers, all of which begin with a 6. My engine serial number is: 3281427. Does anyone know what this means? Is this a replacement case perhaps?
Old 07-01-2013, 10:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Banned
 
Join Date: Apr 2004
Location: Portugal
Posts: 1,513
Send a message via AIM to prebordao Send a message via Yahoo to prebordao Send a message via Skype™ to prebordao
There' something fishier there...

the VIN 911 410 xxxx is for a 911 coupe, not targa...
Old 07-02-2013, 04:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
47silver's Avatar
 
Join Date: Sep 2002
Location: Pittsburgh
Posts: 3,039
Garage
numbers

328 looks like a 1968 case
__________________
1975 911S Targa
Silver Anniversary Edition
Old 07-02-2013, 05:11 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
Quote:
Originally Posted by prebordao View Post
There' something fishier there...

the VIN 911 410 xxxx is for a 911 coupe, not targa...
IMO, this could be a major issue for the OP. It's one thing to rebadge a normal 911 into an S, but changing a coupe into a targa or changing VINs, is another issue entirely and much more serious.
__________________
L.J.
Recovering Porsche-holic
Gave up trying to stay clean
Stabilized on a Pelican I.V. drip
Old 07-02-2013, 06:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered
 
47silver's Avatar
 
Join Date: Sep 2002
Location: Pittsburgh
Posts: 3,039
Garage
maybe a typo?

might be a typo and perhaps someone made a targa from a coupe, after all it is in hawaii, so may have wanted a targa.
__________________
1975 911S Targa
Silver Anniversary Edition
Old 07-02-2013, 06:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered
 
Join Date: Jul 2008
Location: Spokane WA
Posts: 585
Quote:
Originally Posted by 47silver View Post
328 looks like a 1968 case
Dammit...you are correct sir! I didn't think to look back that far. The motor was rebuilt by Ottos in Venice at some point so I wonder if they did an exchange or if the original case was toast...
Old 07-02-2013, 10:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
JED
 
ARCSinAK's Avatar
 
Join Date: Jul 2009
Location: Hawaiian Islands/SV Idaho
Posts: 1,509
Garage
Anyone care to share how Porsche bumped the 25hp between the base 2.7 and the S engine. I know about the bigger port heads but what were the other improvements. Cams? Pistons?
Old 07-02-2013, 11:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Registered
 
procan's Avatar
 
Join Date: Jan 2012
Location: West Texas
Posts: 305
Garage
Quote:
Originally Posted by ARCSinAK View Post
Anyone care to share how Porsche bumped the 25hp between the base 2.7 and the S engine. I know about the bigger port heads but what were the other improvements. Cams? Pistons?
Higher compression pistons.
__________________
1969 Porsche 912/911E Hotrod - Light Ivory
2003 D2 Audi S8 - Black (DD for the snow!)
1974 Porsche euro 911S Targa - Grey (Sold! Off to the Netherlands!)
Old 07-02-2013, 07:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Porsche's Love-em Live-em
 
Join Date: May 2006
Location: Waimanalo, Oahu, Hawaii
Posts: 2,018
Garage
Re: Anyone care to share how Porsche bumped the 25hp between the base 2.7 and the S engine. I know about the bigger port heads but what were the other improvements. Cams? Pistons?

Aloha JED, Yap .5 in. more compression [S was 8.5cr.]and cams with a little more valve duration and lift.

Old 07-02-2013, 11:35 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
Reply


 


All times are GMT -8. The time now is 09:37 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.