|
|
|
|
| Author |
|
|
Registered
|
Headers or SSI heat exchanger
Question?
I have a 78 Euro engine that I'm currently rebuilding. I'm going with a 78 CIS and my cams will be regrind to 964 cams, 226 mm fan and ARP studs. I wanted to know which would work better with my proposed setup header or SSI Heat exchanger. This will be a weekend street driven and power if I need it I'm aiming for a total 250 hp. I'll have my compressed bumped up and I'll be using a twin plug. Thanks in advance |
||
07-09-2009, 04:39 AM
|
|
|
Registered
|
ssi's if you want heat and a bullit proof header/heat exchanger
__________________
Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
||
|
07-09-2009, 04:43 AM
|
|
|
Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,496
|
SSI's are a tuned header system and you get heat. If you have the $$$ that is what I would go with.
__________________
Kurt V No more Porsches, but a revolving number of motorcycles. |
||
|
07-09-2009, 05:08 AM
|
|
|
Registered
|
Thanks mb911 and Kurt V
|
||
|
07-09-2009, 05:23 AM
|
|
|
Registered
Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
|
I've always assumed that SSIs, which I have, _are_ headers, just encased within heat exchangers. In other words, you're not giving up any exhaust-extraction performance by fitting SSIs.
__________________
Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
||
|
07-09-2009, 05:39 AM
|
|
|
Registered
|
I thought SSIs are headers with an extra layer of metal for the heater ducting. The only reasons not to use them are weight (marginal), the diameter is too small (big-bore motors), or money.
__________________
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. |
||
|
07-09-2009, 07:11 AM
|
|
|
|
Registered
Join Date: Jan 2004
Location: Charleston, SC
Posts: 821
|
When I rebuilt my '79 SC I upgraded to 9.5 pistons, 964 cams, and SSIs. I think these all compliment each other nicely. As others said, SSIs are headers with heat.
__________________
Kevin '79 Coupe |
||
|
07-09-2009, 07:19 AM
|
|
|
Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
|
Agreed SSI is the way to go. I've played with B&B, Triad, OBX (twice) and the fitment is hit or miss. The SSI is a highly precise header (yes, it is a header) that fits every time. They're a bit expensive, but it's money well spent IMO.
Also keep in mind the heat benefit of SSI from a different perspective. Yes, they have the provision to supply heat to the cabin. But what that heat exchanger shrouding also does is protect other engine components from the heat of the headers. Parts like the oil lines, shock absorbers, CV joint boots are shielded from heat by the heat exchanger shrouding. Other traditional headers have the exposed pipes radiating a lot of heat toward those aforementioned parts pretty good!
__________________
Kevin L '86 Carrera "Larry" |
||
|
07-09-2009, 07:25 AM
|
|
|
3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
|
+1 SSI on this config. You don't get any benefit on custom headers on your motor.
__________________
- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
||
|
07-09-2009, 07:33 AM
|
|
2009 
Monique
2010 
