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Join Date: May 2005
Location: Vancouver Island , British Columbia , Canada
Posts: 420
High Temperature

Hi,
I just finished building my 1977 , 930 Turbo, I started with a tub and added every thing else.
The car starts well and runs well but the heat behind the rear bumper is very high. It appears to be a muffler heat . I am concerned that the heat may melt the Porsche reflector that runs above the license plate. Also the bumper itself is very hot.
I have a heat shield installed inside the rear bumper but it is not helping.
Do you think that the heat will dissipate when car is driven or will increase ?
Do you think the engine is running to hot and requires additional cooling ?
Please let me know if you have a solution to this issue or if you have any recommendations .
Many thanks in advance.
Old 10-09-2008, 05:28 PM
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rsrmike's Avatar
 
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The rear bumpers get HOT on 930's at a standstill, it's mostly from the turbo.

I believe there are multiple heat shields?

Have you checked ignition timing? If it's retarded the EGT will go up considerably, even at idle

Too rich or lean AFR won't help either.

Does your engine have an air pump system, if it doesn't turnoff, it could affect EGT as well.

There are thermo-vacuum valves originally to turn off the air injection when the engine warms up, if one of these was overlooked or bypassed it could cause high EGT...

Perhaps take some readings off the bumper w/ infrared probe and report back w/ more details i.e. ambient temp, run time since cold, etc. etc.

Good luck
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Old 10-09-2008, 08:20 PM
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Mine gets really hot too.

Too hot to touch at times and I wondered the same about the reflector, paint, etc. but it still looks good as new.

BTW I have no air pump/injection.
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Old 10-09-2008, 08:40 PM
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It is the nature of the beast. Mine gets real hot also about 140* or so. No problems after 30 years.
Old 10-09-2008, 09:20 PM
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Thanks for your input.
The temperature at the gauge is about 200* and almost 130* at the Bumper and reflector.
I will take the car for Ignition timing and see what effect this will have on high temp.
I will post results
Thanks again
Old 10-10-2008, 05:49 PM
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Check ignition timing, if delayed headers will glow and everything gets very hot. Turbo bearings don't like it either. Remove and plug air injection if legal in your state. (six 10x1 plugs needed).
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Thank you for your time,
Old 10-11-2008, 08:30 AM
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My reflector melted right off.....somewhere on highway 167 sits a $150 piece of P O R S C H E plastic ;-)
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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 -
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Old 10-11-2008, 01:46 PM
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My 964 one is a little warped too, but only on the back where it's not seen.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 10-11-2008, 05:17 PM
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