Very high temps with factory HAI

[ShadeTreeMech]

As far as I can tell, the engine is still very much the same, just modernized a bit. I think mine has a vacuum controlled air intake thermostat, because I later found the disconnected vacuum port. Hopefully that is one problem solved.

I hope the alternator is the same situation on mine, that would be excellent!.

[Superfuelgero]

They're very different beasts. Aside from the whole rwd v. front wheel drive; yours is a "whiteblock" 5 cylinder dohc all aluminum, the 240 is a 4 clyinder sohc, iron block "redblock". I've owned both, while you can see the a similar design philosophy, they're very, very different.

[ShadeTreeMech]

Originally Posted by xntrx

They're very different beasts. Aside from the whole rwd v. front wheel drive; yours is a "whiteblock" 5 cylinder dohc all aluminum, the 240 is a 4 clyinder sohc, iron block "redblock". I've owned both, while you can see the a similar design philosophy, they're very, very different.

wow, I assumed that the 2.4 was always a 5 cylinder. And I have an aluminum block? didn't know that either. I knew about the SOHC variety. So I guess now starts my education on the Volvo brand.

[ShadeTreeMech]

Another little tidbit on this saga with my air preheater. I usually run 87 octane (I know I'm not supposed to, but it's cheaper) and the intake air temp will be around 120 to 130. In a tank of 87, I added about 4 gallons of 91 because I was going for a run on the interstate. The intake air ran a bit cooler, usually around 100 to 110. On the trip back, I added 14 gallons of E85 to the 4 gallons of gas already in there, and the intake air plummeted to the fresh air temperature.

So does Volvo compensate for the wrong octane being used by pulling in hotter air (which should mean less total air going into the cylinders) instead of adjusting the timing? I was also watching the ignition advance timing guage and it stayed pretty constant according to engine speed. I didn't expect that at all.