How hot are your Cats ?

[steve-V8s]

After a run of about 4 miles mostly in traffic but involving a couple of overtaking blasts and a small delay for opening the bonnet and getting the thermometer from upstairs, the exhaust manifolds, just prior to the lambda sensors were both about 270c. I was pleased to find them similar temperatures and also to find the block at 90c as per the gauge.

Anybody know if 270 is within the “Normal” range. It seems to be getting unusually hot under the bonnet recently.

[shpub]

When I did the heat testing for my heat shields, 270 was definitely the norm. Highest I got the exhaust manifolds to was just under 400 - 40 miles dash round London on a hot day. The temp on the other side of the shield near the otter switch was 83 with the water temp around 90 ish.

[GreenV8S]

steve-V8s said:

Anybody know if 270 is within the “Normal” range. It seems to be getting unusually hot under the bonnet recently.

That's not very hot at all. You'll get double that if the engine is working hard.

[trackcar]

Cats dont even start to work until double this temp .. one of the reasons they're pretty rubbish for town centre exhast related gas reduction .. they don't get hot enogh to work. 270 would be a typical idle temp .. as GreenV8S says you'll see (at least) double these figures when under load.

[dnb]

I am seeing exhaust gas temperatures around 500c on my car when "gently" cruising the M-way. When pushing on a bit, they peak at approx 600c.

Idle is around 250c as everyone says.

Rememeber that this is gas temperature - not manifold skin temperature which is a LOT lower.

[steve-V8s]

OK, thanks for all the replies, that makes me feel a bit better.

[Ballistic Banana]

Dunno but Quinnys where red hot



more HERE

BB