Isuzu Trooper Owners Club UK™

the flower man · Posted: Mon Jun 02, 2008 17:23 Post subject: inter cooler

hi all,never taken the intercooler of my bighorn (94) but have heard that when you do clean them out it will shock you as to what you find in side Shocked

question is, how does it come off and im i right in saying that there is 4 location bolts i have got to remove? is it only water that passes through the inter cooler or will i find other hydrolic or oil ect. does it cool air round the turbo as well as water? reason i ask this is there seem to be alot of pipes for the amount of work it should do. sorry for the igrenence but havent taken this bit appart yet. thanks all
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Philp · Posted: Mon Jun 02, 2008 17:55 Post subject:

It just cools air as when the turbo squishes it down it gets hot (1st law of thermodynamics or something like that) Its dead easy to remove, just take off the pipe from the air filter to turbo to get better access, theres a few bolts that hold the cooler on and remove the two fat hoses that go in/out of the cooler and lift off, thats it. Best bet is to soak it in something like parrafin or diesel overnight, rinse with degreaser and then hot soapy water and then leave to dry (or fire a hot air gun through it!) and refit.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

dxmedia · Posted: Mon Jun 02, 2008 17:55 Post subject:

The intercooler cools air not water.

The air comes from the turbo through the intercooler into the inlet manifold. They fill up with oil due to it seeping past the seals in the turbo. 2 Jubilees and 4 bolts should have the intercooler off - the one at the drivers side on the back is a little tricky to get to though.
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the flower man · Posted: Mon Jun 02, 2008 18:04 Post subject:

thanks alot. i was under th impreshon that turbos were water cooled by the inter cooler. is this right on some motors? if it cools the air before it goes into the inlet manifold then why is it that people front mount them and grt more performance out of the turbo? does cooler air compess better (at a higher psi)
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Philp · Posted: Mon Jun 02, 2008 19:15 Post subject:

Cooler air is denser (i.e. it carries more oxygen for a given volume) so you can add a touch more fuel and get a bigger bang for your buck.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

the flower man · Posted: Mon Jun 02, 2008 19:20 Post subject:

lovely that what i thought. thanks alot that makes sence Very Happy

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presumption is the mother of all f**kups

jonkem · Posted: Fri Jun 13, 2008 23:39 Post subject:

the flower man · Posted: Fri Jun 13, 2008 23:54 Post subject:

if you front mount the intercooler would you get more lag or is there a non return valve between the turbo and the inlet manifold? im asking this coz there is much more pipe work involved shorly and that would all have to be pressorised?
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presumption is the mother of all f**kups

jonkem · Posted: Sat Jun 14, 2008 1:29 Post subject:

All the pipes between the turbo and inlet will be pressurised by the turbo. The extra lag is minimal compared to the benefit of front mounting. You don't need any kind of non return valve as the turbo is always spinning while the engine is running.
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1988 MKI 3.1td Hybrid Van (Ex Bobtail)
1991 SWB Fronty 2.8td Hybrid
2000 Astra Estate (work)
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MK1 SR Nova

rallymarshall · Posted: Sat Jun 14, 2008 11:09 Post subject:

on the tractor at work, the inter cooler is in front of the aircon,oil and water radiators and if you put your hand on the 1 side of the intercooler where the pipe comes in from the air filter and your hand on the other side where it goes to the inlet manifold, you can realy feel how much difference it makes, hot inlet, cold outlet, (still doesnt make a difference in power cos the tractor is sh it Rolling Eyes

and cant tweek the pump)
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65 vauxhall mokka 1.6cdti 4x4 se
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the flower man · Posted: Sat Jun 14, 2008 16:34 Post subject:

took off and cleaned the intercooler today. i think some one had beaten me to it as it just had a smering of oil in the inside. held it up to the light and you can easy see through all the channles Very Happy

. on the end of the intercooler on the turbo side the is a vacume operated valve that opens a flap inside the housing that bolts to the intercooler and there is another pipe to a niple lower down. is this anything to do with the egr valve and the boost control? both pipes had splits in the end off them so i cut them down and put them in hot water so i could get them back on.this has impoved things. i have more boost and less turbo noise which is well go but i would like to understand what i have fixed if you could Very Happy

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presumption is the mother of all f**kups