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 > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Eye of the Toiger
 
matty74's Avatar
 
Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Garage
I'm putting in 3.2 Chain tensioners what else should I do while my engines out?????

I'm putting in 3.2 Chain tensioners what else should I do while my engines out?????

2.7L stock with CIS strock exhaust, may upgrade exhaust not sure.

I want to get more power, studs and cases savers alraedy done.

Ad a new camshaft???? but don't want to change from CIS this is quite reliable but I do want more grunt..

any suggestions? money not tight but I don't want a race engine either, I want a hot street motor.
__________________
http://www.aircooled.com.au

1973 911 RSR clone powered by 77 3.0 turbo

Last edited by matty74; 10-28-2005 at 02:02 AM..
Old 10-28-2005, 01:55 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,326
As you probably know already, the CIS found on the 2.7 does not respond well to hot cams. Your current cam runs 224 intake degrees. It is possible to go with a SC grind which would add 10 degrees to the intake cycle without too much impact. The 964 grind offers more intake timing, but I'm not sure if it is the best choice. The other issue is your 2.7 cams are three bearing cams. The SC, Carrera and 964 cams are four bearing cams so aren't usable in your motor unless you replace the cam towers.
John Dougherty is the cam expert on this site. His advice is solid.
You may need to be concerned about emissions, which also limits what you may do with your motor.
Ultimately the CIS was a early response to tightening emission regulations around the world and as such is difficult to hot rod.
I replaced my CIS with Webers last year which allowed me to use Solex cams. The solex cams offer more intake timing while maintaining street drivability. Along with 9.5:1 JE pistons I have gained about 25HP.
Emissions are not an issue in the county where I live.
Bottom line, to get to 3.0 or 3.2 type performance with your 2.7 motor will require you to replace the CIS.
__________________
DOUG
'76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's.
'85 911 Carrera, stock, just painted, Orient Red
Old 10-28-2005, 09:02 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
drag racing the short bus
 
dd74's Avatar
 
Join Date: May 2002
Location: Location, Location...
Posts: 21,980
Matty - your signature states you have a Euro spec 911S 2.7. If so, you already have 175 hp engine. That's five hp shy of a 3.0, and probably performs on par if not better than a slower-winding 3.0.

If you have a '74, then you have the good exhaust on your engine, so I wouldn't mess with that.

What 2.7 Racer says is true: the best you can do from this point is tear apart the engine, install higher comp. pistons, hotter cams and Webers.

You should near 220 hp with those modifications - but it's gonna' cost ya...
__________________
The Terror of Tiny Town
Old 10-28-2005, 09:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Eye of the Toiger
 
matty74's Avatar
 
Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Garage
Thanks Guys, very helpful. I'm also looking at changing my gearbox.

I have a 4 speed but want to go to a 915 box, there are some close ratio gears you can put in these boxes, what the story with that?

I hear that this moification can give the perception of 30% more power?
__________________
http://www.aircooled.com.au

1973 911 RSR clone powered by 77 3.0 turbo

Last edited by matty74; 10-28-2005 at 12:42 PM..
Old 10-28-2005, 12:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Grand Am/IMSA Data Guy
 
Porsche84's Avatar
 
Join Date: Apr 2004
Location: Southwest Florida
Posts: 1,781
Garage
I would recommend replacing the O ring on the thermostat as well as replacing the oil pressure switch (the small one for about 10 bucks). These will avoid messy oil leaks which are very difficult to fix with the engine in the car.

I have a file with many 915 gear set options and some misc gear data I have gathered for 915 transmissions. Send your e-mail address and I'll send you the file (it is EXCEL format).
__________________
Jerry Austin
AIM Data Products Dealer
84 911 3.6 track car
Morris Minor Van with S2000 running gear (project)
http://austinmotorsportsllc.com/
Old 10-28-2005, 02:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Eye of the Toiger
 
matty74's Avatar
 
Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Garage
That would be great

matt@sourcee.com.au
__________________
http://www.aircooled.com.au

1973 911 RSR clone powered by 77 3.0 turbo
Old 10-28-2005, 02:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Grand Am/IMSA Data Guy
 
Porsche84's Avatar
 
Join Date: Apr 2004
Location: Southwest Florida
Posts: 1,781
Garage
sent you the file
__________________
Jerry Austin
AIM Data Products Dealer
84 911 3.6 track car
Morris Minor Van with S2000 running gear (project)
http://austinmotorsportsllc.com/
Old 10-28-2005, 02:52 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Eye of the Toiger
 
matty74's Avatar
 
Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Garage
Thanks dude thats awsome
__________________
http://www.aircooled.com.au

1973 911 RSR clone powered by 77 3.0 turbo
Old 10-28-2005, 03:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Try not, Do or Do not
 
Henry Schmidt's Avatar
 
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 5,983
Garage
Quote:
Originally posted by matty74
..........I'm also looking at changing my gearbox.
I have a 4 speed but want to go to a 915 box, there are some close ratio gears you can put in these boxes, what the story with that?............
For about $1,600 we can rebuild your box and change it to a 5 speed.
Email me and we'll talk.
__________________
Henry Schmidt
SUPERTEC PERFORMANCE
Ph: 760-728-3062
Email: supertec1@earthlink.net
Old 10-28-2005, 04:05 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Now in 993 land ...
 
aigel's Avatar
 
Join Date: Mar 2003
Location: L.A.-> SF Bay Area
Posts: 13,552
Garage
RSR seals on the rocker arm shafts comes to mind! That won't make it any faster, but will help prevent future leaks.

George
__________________
97 993
81 SC (sold)
Old 11-03-2005, 11:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Try not, Do or Do not
 
Henry Schmidt's Avatar
 
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 5,983
Garage
Proper installation of rocker shafts and cam towers without damage and RSR shaft seals are not ever necessary.
We have never used them in a street engine and we guarantee our engines won't leak.

Inspect the cam towers and polish the shafts. Position the shafts properly and torque to spec. No leaks. .
__________________
Henry Schmidt
SUPERTEC PERFORMANCE
Ph: 760-728-3062
Email: supertec1@earthlink.net
Old 11-03-2005, 11:19 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Now in 993 land ...
 
aigel's Avatar
 
Join Date: Mar 2003
Location: L.A.-> SF Bay Area
Posts: 13,552
Garage
RSR seals are a belt and suspenders thing. It's only a few bucks and 3 ounces of weight! Wayne is a big fan of them. Must be because he sells them eh?

Along the same lines, you can limit travel of the carrera tensioners. Here is a link to the procedure:

Shops that don't recommend Carrera Tensioner Update?

I have written a more extended tech article about the procedure and submitted it to PP but nobody got around to posting it yet.

George
__________________
97 993
81 SC (sold)
Old 11-03-2005, 11:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 03:10 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 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.