Temperature of Log

[TeddyXY71]

Just wondering, what temperatures does the log part of the intake manifold experience? I would imagine temperature woldn't be too bad during normal steady-state travelling. But what about, say, severe heat soak conditions immediately after turning off the motor? Will temps be under 200°C or might there be areas (floor of the log maybe) that could go higher? Just curious.

Teddy

 

[80broncoman]

If the ccolant is at 200 then the base (bottom of the head must be much hotter. If you then shut off the engine coolant flow stops and the heat at the base of the head and in the Exh areas starts to spread into the other (cooler) parts and of course those parts absorb the heat as they get hotter.
It would not surprise me to see 240-260 at the floor of the log for a short period of time.

 

[addo]

The man to ask, would be our lawyer in residence, Mr "Bengoshi2000". He's just bought one of those infra-red thermometer/pyrometers.

 

[lyonsy]

on my 2v when just idling i had the infa red on it my infa red stoped @ 120deg C that was after 2mins of idling
the log was a bit better but not much its main benifit was it dident keep raising like the 2v did.
the log engine whould make an exceelent cold weather engine but

 

[matt1967]

well if I get water in the ressessions in the log part of the head, a few minuites and it's boiling, so at least 212*f

 

[Anlushac11]

well if I get water in the ressessions in the log part of the head, a few minuites and it's boiling, so at least 212*f

Depends. Are you above or below sea level? what altitude do you live at?

The may not be enough difference in altitude where you live but in general the higher the altitude the lower the boiling point.

Also with heat soak its possible to get hot enough to boil water, especially with the exhaust manifold under there. If you have a late model car with cats they can cause back pressure that can raise exhaust temps.

I used to work at a local Airport and on the side of the hangar it used to say that the airport was IIRC 972ft above sea level.