Installing Heet Sheets

[tshih]

Sherwood,

I think Porsche has introduced ceramic liners in the exhaust manifolds of the later 911, 944 turbo, 928 etc to combat heat extraction and added insulation. The operating temperature of most Porsches in motion not stuck in traffic jams are all within specs despite the proximity of the exhausts. So why worry about not having cooling during being stuck in those kinds of situations. I'd rather be blasting around at high speeds with the temp gauge reading 190 deg F.
Tom S.

[RSupdate]

Just for the record, I installed a set of Sherwood's Heetsheets in about 20min total...and I'm a slow-poke.

I bought them because they are a good additional 1% "so to speak" in the chain of reducing heat radiation back at the engine.

I figure that several small improvements like this will add up to a small yet noticable reduction in oil temp overall.

Just my .02

[911pcars]

"I think Porsche has introduced ceramic liners in the exhaust manifolds of the later 911, 944 turbo, 928 etc to combat heat extraction and added insulation."

Tom,
Those ceramic port liners are missing in most 911s until they appeared in the very latest engines (993s?). So many of us don't have the benefit of those. Besides, I think the factory installed them mainly for OBD II requirements; quick warmup time for low emissions from the cat.

"The operating temperature of most Porsches in motion not stuck in traffic jams are all within specs despite the proximity of the exhausts. So why worry about not having cooling during being stuck in those kinds of situations.

I'd rather be blasting around at high speeds with the temp gauge reading 190 deg F."

From the many responses on this forum, owners report oil temperatures of 230-250º. This may be within "factory specs" but it doesn't help engine longevity operating at this level.

Not sure what the weather and traffic patterns are like in your area, but I'm in So. Calif. When it's hot, the traffic is usually stop-and-go. I usually reserve the blast when I can get out of the city .... or late at night when the only "heat" is just a radar blip away.

Hellgate,
You'll have to supply your own eram(s). BTW, anyone ever think of using this to supply a large quantity of hot air to the cabin? Might be enough to dry clothes.... while you're wearing them.

Regards,
Sherwood

[Roland Kunz]

Hello

First car with Ceramic Portliners and first use in a street automobile = 951 in 1985

First 911 with Ceramic Portliners = 964 in 1989

Grüsse

[ChrisBennet]

I made my own heat shield to protect the lower plug wires from the heat of the cat. It's not pretty but it does the job until I get a nicer one made.
-Chris