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Registered
Join Date: Aug 2005
Posts: 34
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Heat exchanger vs headers
This may be a stupid question. What is the difference between heat excahngers and headers. Is one more favorable over another. I live in Florida so heat inside is not necessary.
Any advice would be appreciated Mike 75 911S |
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RETIRED
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Headers are cheap....heat exchangers are not....if you don't need heat....go with headers....
Headers usually have a larger diameter and let an engine breathe better....but stock engines actually like stock exhaust....
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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MBruns for President
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Where in Florida are you mikey?
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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Moderator
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Some heat exchangers, like SSI & B&B are headers with heater boxes wrapped around them
Here is a pic of SSI w/ one of the heater box covers cut away ![]() Factory exhaust '75 -94 is also a header w/ a heater box wrapped around it, it's just not the optimum design to take advantage of any 5 th cycle effect that may be present here is a 964 header w/ heater box cut away ![]()
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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Registered
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Do heat exchangers help with heat removal vs. headers? I don't know if my question makes sense.
Do headers allow exhaust heat to remain in the vicinity of the engine, whereas HE use fan air to duct it away?
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Tom '71 911 T Targa (Sold ![]() |
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MBruns for President
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Nope - just help you keep your tootsies warm in those cold climates...
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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Registered
Join Date: Mar 2002
Posts: 3,563
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If you don't need the heat because you live in a warm climate all year round, replace the heat exchangers with stainless steel headers.
Headers would weigh a lot less too ![]()
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition ![]() |
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Registered
Join Date: Jul 2004
Location: Houston, TX
Posts: 426
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So allow me to add my ignorance to this post. I live in Houston, so I have an abundance of heat. Is everyone saying that I have heat exchangers that I can replace with headers, and I will benefit from this swap?
Thanks!!!
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'86 911 targa '04 MB 230K Sport (daily) |
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MBruns for President
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Headers (B & B) with integrated HE's
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
Posts: 21,983
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Quote:
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drag racing the short bus
Join Date: May 2002
Location: Location, Location...
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Steve in Houston - if you're interested, you might want to see what Michigan Mat is selling...
3.2 B&B Headers + Muffler + Oil lines - $1500 |
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Registered
Join Date: Dec 2002
Location: bay area
Posts: 423
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Heat exchangers are the stock exhaust that came with your car, it's an exhaust sytem that also allows you to have heat.
Headers can come with or without the heat option but headers are generally considered a high performance exhaust system made up of equal length exhaust tubes that allow the exhaust pulses from pistons to exit without getting in each others way. Ideally, this produces more hp, say, 10-18hp on a 3.0 for example. Was that your question? |
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coolcavaracing.com
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So, is the SSI's heat exchangers or headers with the heat option??
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Pål (Paul) - The Norwegian lost in Finland... 1978 911SC 3.6 | 2001 Boxster S Racing Car | 1966 912 based 911 RSR replica racing car (for sale!) come and follow the Porsche Sports Cup racing fun and me at www.facebook.com/coolcavaracing ![]() |
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Registered
Join Date: Aug 2005
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Does not installing the heat exchangers also eliminate use of the defroster? It does rain alot in Fl. Thanks for all of the tips.
mike 911s |
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Moderator
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Quote:
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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coolcavaracing.com
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Yes i did read it, but I am Norwegian - I drink Beer
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Pål (Paul) - The Norwegian lost in Finland... 1978 911SC 3.6 | 2001 Boxster S Racing Car | 1966 912 based 911 RSR replica racing car (for sale!) come and follow the Porsche Sports Cup racing fun and me at www.facebook.com/coolcavaracing ![]() |
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,961
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Quote:
You may not need heat but how about defrost in the winter? Insides of the windscreen get misty or need clearing? I thought I did not need heat either (Phoenix is rather warm most of the time) but there are times during the fall and winter when the windows need clearing and a touch of heat sure helps. Get some SSI's or B&B's and you have the best of both worlds. Joe A
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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Doesn't want/need a 3.6L
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![]() Headers made in higher grades of stainless steel (T304 or T321 for example) will be much more expensive. Ralph |
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Tom,
Heat exchangers actually DO help with removing heat from the engine. One trick to help keep the engine cooler in summer is to pull up on the red levers just a little which will dump some heat from the engine compartment without heating the cabin. Mike, If you don't have heat then you won't have the type of defrost that actually melts frost (like we need up here in winter). However, if you just need demisting you may be OK w/ just the fan blowing ambient air. Pal, Don't be afraid to ask "stupid" questions. Everyone's got them. A few "stupid" answers have been posted too. Don't ask me how I know.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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Registered
Join Date: Feb 2004
Location: Houston
Posts: 1,486
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Are there any effect of run headers with a 2.4 MFI engine? Backpressure?
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Derek Oxford PCA - Nationally Certified Instructor 2002 Boxster S ( race car) 2010 LR4 2009 GMC Sierra (Porsche Support 2011 M3 4Door |
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