Page 2 of 2
Posted: Fri Apr 21, 2006 8:12 am
by turbosl2
with no intercooler the charge temps can def be in the 200s since they are not going through a heat exchanger.
Not only overcharged
Posted: Fri Apr 21, 2006 11:33 am
by snillet
Not just overcharged engines that goes high on MAT sometimes
On my Peugeot the airfilter is placed just about 20cm above the exhaust manifold (with a so called heat deflector inbetween) and when i in daily driving get stuck in traffic lines when i drive to work the temp is pending between 75 and 85 degrees C i think 85 degrees C is about 190 degrees F or something like that ?
But i´m ditching that setup soon for an open filter closer to the front of the car instead.
I know that older turbocharged engines (had a 1981 Saab900T8 for a while) runs DARN hot on the intake .... after a while of driving using the turbo a lot you couldn´t touch the intake manifold.....
Posted: Sat Apr 22, 2006 9:01 am
by benflynn
i have seen a 355 iat on a dyno, and a real crappy intercooler, i don't think it can possibly be correct
Posted: Sat Apr 22, 2006 11:57 am
by 2screwed
benflynn wrote:i have seen a 355 iat on a dyno, and a real crappy intercooler, i don't think it can possibly be correct
I have a twin SC 355 and I know that the temperatures can get this high at high pressure ratios. The SC doesn't care if it's boost or vacuum and you'll have high P/R at idle. If you have a by-pass valve that opens at low loads you can decrease the discharge temperatures there alot. I have both by-pass valve(s) and a decent IC and my iat is not normally over 35-40ºC at 15 psi or at idle. You can see the discharge temperatures at different P/R for a twin screw SC here:
http://www.opconab.com/www/files/lyshol ... 3300ax.pdf For a roots the temperatures will be higher than this.
Lars