Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  We salute a legendary member of the community.
Thank you for selflessly sharing your wisdom with us...
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Dec 1969
Posts: 24
Garage
911 sc upgrades

Just now installing the pre 1974 non thermal ssi heat exchangers and dual in single big dump out muffler on an otherwise stock 1982 911sc. Looks like will add about 35lbs of torque? Seems high for an exhaust upgrade... anybody have any comments on what to really expect?

Also, thinking about replacing the stock csi with the six webber carb set up (40mm) and installing the pre 1974 distributor for proper curve ect. Anybody know if an otherwise stock 3.0l will see much improvement with this upgrade?

Thanks guys!
Mike, Regina , SK, Canada
Old 06-01-2010, 08:09 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Feb 2002
Location: Van Nuys
Posts: 9,261
Adding carbs to the motor, with the SSi's and a free flow muffler, will add between 25-30 hp total.
You cannot use a distributor from a 2.7 as the 3 liter dizzy runs counter clockwise. You can have your distributor rebuilt/ recurved by several reputable shops.

We use Aaron Burnham at Rennwerks in Camarillo
__________________
1970 914-6 street"evil cockaroach"
914-6 "GT" Signal orange clone- vintage track racer (coming soon)
1970 911 Spyder
1970 911S Conda
1973 911S Glacier Blue
Old 06-01-2010, 09:39 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Dec 1969
Posts: 24
Garage
Thank you.
Was miss informed about the use of the older distributor. Glad I didn't fork out the cash yet!
mike
Old 06-03-2010, 08:05 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
Registered User
 
racer's Avatar
 
Join Date: Jan 2004
Location: Northern Virginia
Posts: 2,582
i think a 10-15% improvement in exhaust is possible (heat exchangers, 2in-2out pipe.

I don't think just a swap to Carbs will do anything without a change to the cam to take advantage of the increased breathing. 40's sound small to me as well, I would think you would want 46s at least..
__________________
1987 944
Past:
2000 Boxster 2.7, 1978 911SC Euro,
1976 914 2.0, 1970 914 w/2056
Old 06-03-2010, 08:08 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 4,975
SC cams and 40 Webers are fine on an 3.0L. If you up the cam the take advantage of the reversion resistance offered by carbs (say a mod-S cam), 46s are preferred, but the slippery slope is that in most cases with higher perf cam and higher revs, you'll need to upgrade your rods to ARP bolts. This can be done without cracking the case...a PIA, but doable.
__________________
Kenik
- 1966 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 06-03-2010, 09:57 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
Less brakes, more gas!
 
euro911sc's Avatar
 
Join Date: Jul 2005
Location: Hobe Sound, FL
Posts: 3,413
Garage
Well you will have to do the pistons if you are upping the cams... CIS pistons are not well suited to high lift cams... So now you have changed pistons, rod bolts, cams, and intake... might as well just get a set of bigger cylinders and go 3.2l SS with it

Mike, there are several threads on SC engine upgrades from mild to wild on the engine rebuild forum check it out!
__________________
Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'03 330i Family hauler w/ extras
Old 06-03-2010, 10:19 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
 
Now available:  101 Projects for Your Porsche Boxster!
3 restos WIP = psycho
 
kenikh's Avatar
 
Join Date: Feb 2005
Location: North of Exit 17
Posts: 4,975
Quote:
Originally Posted by euro911sc View Post
Well you will have to do the pistons if you are upping the cams... CIS pistons are not well suited to high lift cams... So now you have changed pistons, rod bolts, cams, and intake... might as well just get a set of bigger cylinders and go 3.2l SS with it

Mike, there are several threads on SC engine upgrades from mild to wild on the engine rebuild forum check it out!
Yep - duh; good catch. CIS pistons can accomodate up to a 1.25mm intake valve pocket cut into the piston bump to clear high lift cams. More than that and you compromise crown integrity. The good news is that you can also do this with the pistons in place. Check the "How To" below - pretty cool!

Another Technique for Piston Notching. - FordMuscle.com Forums
__________________
Kenik
- 1966 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 06-03-2010, 10:24 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Registered User
 
joe payne's Avatar
 
Join Date: May 2006
Location: Hollywood,CA
Posts: 476
Garage
Take 200 lbs. out of the car.
__________________
jtp911
Old 06-03-2010, 10:45 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Dec 1969
Posts: 24
Garage
Joe, are you telling me to go on a diet!! Ha! Ha!

Thanks guys! Think I may put the engine back in the car for the next season or two and save up the cash to do the 3.2 l upgrade and the carb upgrade at that time! Also thanks for the great links guys! this was my first ever post! Great info and kinda fun too!
Old 06-03-2010, 12:37 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
An SC motor with carbs, SSI's and a sport muffler can be a very fun motor. Think 3.0E. After all, most the E's were faster than the S motor cars up to 100mph if they both had the same gears.

Keep the cams, they are a great mid range cam and fit the stock gearing very well. Maybe retime them to early 77 3.0 Carrera specs for bit of a bump up top. If it is a 80-83 SC open up the ports to 36mm.

I well tuned 3.0 can make 230-240 hp and dose not have the rod bolt issue the 3.2 dose.

Then get it down to under 2500lbs and it will have the speed potental of a 73RS touring. 2300lbs and you can match a 2.7RS light weight.
Old 06-03-2010, 01:24 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Oct 2007
Location: Wright Patterson AFB, Dayton, Oh
Posts: 417
Garage
Another option for the dizzy is to have it locked out and use one of the new MSD units with digital timing.

Functions the same as running mechanical advance only and timing shouldn't drift. If you haven't upgraded to an MSD unit already, the cost difference is minimal and you'll shouldn't have to re-curve again (mechanically at least) if/when you change to carbs... or when good gas gets even harder to find.
__________________
Don't Lift... Don't Lift... Don't Lift

'75 Targa in "Arrest Me" Red, 3.0SC ('79) engine, Bilsteins, Turbo Tie-rods, SSIs into 2-1 M&K muffler... and looking for my next upgrade.
Old 06-03-2010, 03:08 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Dec 1969
Posts: 24
Garage
Chris
I was a little scared about moving to the MSD ignition because of some earlier posts I have read. But have always been a fan of them in my North American track cars ( new to the Porsche, this is only my second full summer with her!) But I like your idea, how do you lock the dist. ?
Thanks
Mike
Old 06-03-2010, 06:27 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #12 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
Join Date: Oct 2007
Location: Wright Patterson AFB, Dayton, Oh
Posts: 417
Garage
Have it done professionally... definitely beyond my skill level.

The same experts who can recurve the dizzy can lock it out with a fixed advance. Its also a good time to have the all the internals checked, wear items replaced, etc.

You need to decide how much total advance you will want, as the MSD unit is actually variable retard so it initially starts out delaying the spark and reduces the delay as RPMs increase. Then you simply program the desired curve into the MSD unit and you are set. If you need to change the timing, simply reprogram the unit with a different curve.
__________________
Don't Lift... Don't Lift... Don't Lift

'75 Targa in "Arrest Me" Red, 3.0SC ('79) engine, Bilsteins, Turbo Tie-rods, SSIs into 2-1 M&K muffler... and looking for my next upgrade.
Old 06-03-2010, 06:36 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #13 (permalink)
Less brakes, more gas!
 
euro911sc's Avatar
 
Join Date: Jul 2005
Location: Hobe Sound, FL
Posts: 3,413
Garage
Hey Mike! Stop being a 'GUEST' and register Come on in and stay awhile... sounds like you will be here a long time.

-Michael
__________________
Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'03 330i Family hauler w/ extras
Old 06-04-2010, 06:38 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #14 (permalink)
Registered User
 
Join Date: Dec 1969
Posts: 24
Garage
How do I register? I thought I was.... I have a "garage" and a user name am I just not logging in right?
Old 06-07-2010, 10:08 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #15 (permalink)
Less brakes, more gas!
 
euro911sc's Avatar
 
Join Date: Jul 2005
Location: Hobe Sound, FL
Posts: 3,413
Garage
Mike,

Sorry... You are listed as 'Guest', cant receive PMs/emails/etc., your garage is not viewable, and your post count is N/A. Something is amiss Seems you are stuck half way to being a real member... Try logging out of Pelican completely and then log back in. This is not restarting the browser as you user name and pwd are probably cached. Hit the LogOut link in the upper right just above 'Rate Thread' and to the right of 'Quick Links'. After that I would try getting a moderator to look at it.

-Michael
__________________
Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'03 330i Family hauler w/ extras
Old 06-08-2010, 05:58 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #16 (permalink)
Walking dead
 
Mark Morrissey's Avatar
 
Join Date: Aug 2006
Location: New Jersey
Posts: 738
Garage
Thumbs up

+1 on the upgrades.
My backdated 3.0 78SC has Webers, SSIs, stock cams, MSD box, a Sycip rally muffler and it screams. My weight is just under 2300; On the last rally I had NO problem keeping up with an IROC car and several other cars with 3.6 conversions.

Cheers!
__________________
Ordo Templi Moretti

911 hotrod -- 3.0L, lightened, abused with love
Old 06-08-2010, 08:58 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #17 (permalink)
Old 06-08-2010, 08:58 AM
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 01:08 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - 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.