I was reading the 93 Helms manual and I was shocked to read
that the H22 engine has a built in oil cooler. I didn't know that.
It uses engine coolant in the heat exchanger... I wonder how they look.

I don't know of many cars that have one, or do they?

Real interesting chapter in the helms all about the H22 engine.

 

I was surprised as well to find out we had one!

Where is it located?

 

I beleieve they circulate coolant through the oil filter mount.

See this picture

It's not too uncommon for this type of oil cooler on performance production vehicles.

 

yeah my h23 has one too, and i also installed a b&m oil cooler for more protection

http://www.cardomain.com/id/boostlee

 

yep, we have one. It's right under the filter. I wish it was bigger though, oil temps still get too hot on track.

 

Schematic is on page 5-15 of the helms.

Oil flow is: From pump - to filter - to oil cooler - to engine.

Oil cooler is a seperate heat exchanger.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MechEng &raquo;</TD></TR><TR><TD CLASS="quote">I was reading the 93 Helms manual and I was shocked to read
that the H22 engine has a built in oil cooler. I didn't know that.
It uses engine coolant in the heat exchanger... I wonder how they look.

I don't know of many cars that have one, or do they?

Real interesting chapter in the helms all about the H22 engine.</TD></TR></TABLE>

well not only does it act as a cooler, it acts as a heater too. when starting the car cold, the water temp is going to rise alot faster than the oil temp, and honda motors like alot of other motors, need the oil temp to be at a certian temp for things to work properly. and the cool thing is that it tends to regualte the oil temps. not too cold and not too hot. from everything ive read i personally don't think that the h22 needs another aftermarket oil cooler, but thats my own opinion.

oh yeah and what oil temps you guys normally read?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">oh yeah and what oil temps you guys normally read?</TD></TR></TABLE>

Condition / Oil temp / Coolent temp

Around town / 200-210 / 190-200
cool day after 20min on track / 225-235 / 200-205
Hot day after 20min on track / 240-250 / 200-205

This is with stock oil cooler, only engine mods are I/H/E & cat. As you can see the coolent temps allways stay nice and "cool" around 200f, but the oil temps can get up to 250 on a hot day while at the track. That's a bit too hot, but a good synthetic oil can take it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 57STS &raquo;</TD></TR><TR><TD CLASS="quote">

Condition / Oil temp / Coolent temp

Around town / 200-210 / 190-200
cool day after 20min on track / 225-235 / 200-205
Hot day after 20min on track / 240-250 / 200-205
</TD></TR></TABLE>
hmm. good info , i have a temp gaug ein my car, and on normal driving/ beatng i never get above 180, i only go to about 200 when sitting in traffic on a hot day, that is water temp.

 

same here, water temp stays steady at 180. but i have the mugen thermostat sensor to turn on fans early and other upgrades in my cooling system, what is your set-up

 

FYI The NSX has this exact same unit. It also runs hot temperatures on track days. run around 240. Should be around 190. I recommend external Coolers For track events. Anything else is un-neccesary.

 

well you can upgrade the radiator and cooling fans, oil pan, themostat and thermo switch, redline waterwetter, radiator cap.

thats everything else i added to my lude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">well you can upgrade the radiator and cooling fans, oil pan, themostat and thermo switch, redline waterwetter, radiator cap. </TD></TR></TABLE>

The coolent temps are fine. No need to upgrate radiator, or themostats. Even on a very hot day after 20min out on track the coolent temps never get much above 200. 205f at the most. It's the oil temps that get up to 240 to 250, even though the coolent is at 200f. The only way to help this is an aftermarket oil cooler.

Just because your water temps are at 190-200 does NOT mean your oil temps are the same.

 

gotta love japanese ingenuity

 

You guys aren't pushing your Preludes hard enough on the track if you are only getting 250 degree oil temps. I routinely saw 290+ oil temps before I put on my 25 row Mocal. Now I never go over 220 degrees even on the hottest of days.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MechEng &raquo;</TD></TR><TR><TD CLASS="quote">H22 engine has a built in oil cooler. </TD></TR></TABLE>

ok next question is:

if we can how do we improve it. ? would we get more coolant flow to take more heat? do you guys have any ideas? or you think we should leave is as is

 

Usually you don't want to cool off your oil too much, as your engine will produce its best power at a certain oil temp, which is usually a little higher than normal operating temp. when running at the track a friend of mine experimented with his track times in comparison to his oil temp, his best times were when the temperatures were higher than normal. recently with the onset of cold weather he's also thought about actually wrapping his oil pan in some way to help keep the temps up, and power. cooler doesn't always mean better

 

an acceptable way to keep the temps regular would be to install an external oil cooler with a thermostatic control unit. jegs sells them, not sure of the price though

 

My guess is it helps keep the temp of the coolent up on really cold says, since it's right in there where the hottest parts of the engine. It passes the heat off to the coolent, which also helps to warm the air incomming thru the throttle body.

Just a guess anyhow

 

your right 57sts on the oil temps

b&m racing makes an oil cooler kit with the oil filter relocation with it, i think about $120, thermostats control valve was additional $60