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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Heater - 993 engine in SC backdate - a BTDT FYI
Used in the SC with 3.6 Varioram:
RSR tube off of engine shroud No heater fan 964 under-engine stainless splitter tube All heater boxes functional and open for heat I just assembled & correctly installed this system myself - Barely any heat at all, even at 4k rpm. I will install a SPAL 4" fan under the engine sheet tin to assist in air blowage. I am fogging up & freezing - It appears the stock 993 air diverter below the shroud cap doesn't divert much air to the backdated system. Plan on a fan if you are doing this conversion. I'd like to hear of other experiences with this type of setup! THX
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno Last edited by Craig 930 RS; 11-01-2004 at 11:54 AM.. |
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11-01-2004, 11:46 AM
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Got the same thing - except...
I have 964 Heater Boxes. Heat is EXCELLENT. I never have the levers above half "throttle", and I have not even enabled my footwell blowers.
Data Point: I have the 964 Fan Shroud and heater pipe adapter (you must have the same thing, as the Thom Tube requires it) Not perfect though, as the pic shows - my oil line was not going to budge! I am installing the 993 Heater Distribution tube and 993 heater boxes with a Timmins/McNeil "happy crab" dual outlet muffler in the next few weeks, so I will be closer to your current setup. Perhaps this is the B&B Headers heater box construction? From the pics I have seen, the boxes look rather small compared to stock. In this case more airflow would make things worse! Chris 
Last edited by CBRacerX; 11-01-2004 at 12:31 PM.. |
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11-01-2004, 12:29 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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My car has Carrera kick panel blowers, to pull air forward. TRE Motrsports wired it so that my rear defrost switch (Lexan window) is now a two-speed control for the blowers.
I think it makes more sense to put the fans forward, for weight distribution if nothing else, rather than back by the engine.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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11-01-2004, 12:56 PM
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Registered
Join Date: Mar 2001
Location: Wallenstein, Ontario, Canada
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I have factory 993 heat exchangers with the factory 993 cast aluminum tube and Thom's RS carbon heater tube, heat is great. This is on a 964 engine.
Could it be the B&B's, the factory heat exchangers are packed with stainless steel mesh. Todd
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1989 911 Targa |
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11-01-2004, 01:24 PM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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My deal here is the heat that I *can* get to come out at higer rpms is HOT. I just need some volume perhaps?
I do have the B&B tiny heater boxes... It is easy to install a fan out back, much harder for 2 fans up front. I'll give the 1 lb SPAL a try under the tin and see how it works. Even a modest breeze as with the 3.0 SSIs and fan off would make me warmer.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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11-01-2004, 02:14 PM
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My vote for the culprit is the B&Bs, I had great heat when I had SSIs and 964 engine w/ fan, little heat w/ B&B from either 964 w/fan or 993 w/o
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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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11-01-2004, 05:01 PM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Great. B&B strikes again.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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11-01-2004, 05:36 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
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Mine works great with a blower up front. (It's easier to pull a length of rope than to push one.)
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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11-01-2004, 07:21 PM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Oh. At this stage even rope would keep me warmer.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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11-01-2004, 07:34 PM
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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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11-02-2004, 12:07 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
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It's a pair of blowers, actually. And in fairness, 'great' heat in California might not be as impressive in colder parts of the country.
Still, I'm happy with the setup.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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11-02-2004, 12:49 PM
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Registered
Join Date: Jun 2001
Location: Newberg, OR USA
Posts: 126
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Jack...can you give us few details on what/how you did it? thanks
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Steve Ware 83 SC Euro Cab Newberg, Oregon |
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11-03-2004, 06:12 AM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Pics too, por favor.
Signed, Freezing in 3.6 B&B land
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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11-03-2004, 07:00 AM
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I deleted my heater blower last summer, but trashed my car before it was cool enough to need heat. A few weeks ago, on a cool night, a buddy took me for a ride in his 993 C2S with heater blower removed and super charger installed. Car was very warm inside. Without the blower you'll get no heat at idle, but should once you're moving. Not sure about defrost.
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2022 BMW 530i 2021 MB GLA250 2020 BMW R1250GS |
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11-03-2004, 07:32 AM
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Too big to fail
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With my 2.7L and SSI's, I could melt my tennies. The little plastic outlets up under the dash were seriously deformed from the amount of heat. To call the B&B 'adequate' for NorCal winters is being generous.
Compare the B&B to stock heat exchangers or SSI's and the first 2 things you'll notice are a smaller amount of exhaust pipe containted within the shell, and the shell is nowhere near as tight around the exhaust pipe. Therefore not as much exhaust surface area to pick up heat, and a loss of air pressure out the edges of the heater boxes.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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11-03-2004, 08:36 AM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Yup.
My ex-SSIs were scorching hot with no fan on. Time to do some inventing here -
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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11-03-2004, 09:32 AM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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TRE Motorsports did mine. But it wasn't complicated. I have Thom's tube, and the 964 piece between that and the heat exchangers. I modified the tube to fit around my engine tin, but the seal is not great where the CF tube meets the 964 piece. The advantage of the kick panel fans is that if there's a hole in the system, you pull cool air into it rather than pushing hot air out of it.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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11-03-2004, 12:11 PM
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Registered
Join Date: Oct 2002
Location: Northern California
Posts: 786
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How would the Spal fan work under the engine tin? Will a 964 or 993 blower motor fit in the engine compartment. I have a similar problem with my conversion - the heat is far from par. I am running Instant G's McNeil muffler/header set up with Thom's CF Tube and want to try to get air forced upfront so I can enjoy the car during the winter!
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11-09-2004, 08:06 PM
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Registered
Join Date: Oct 2002
Location: Northern California
Posts: 786
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Also, how do the kick panel blowers work - do SC's already have them? Where are they located?
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11-09-2004, 08:23 PM
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911 3.8 "RS"
993 Cab
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
Only Porsche
Only bike
