|IRP Billet Oil Cooler
Good enough that it ought to be stock.
by Martin Hackworth
Photos: Martin Hackworth, IRP
Courtesy of IRP
Tucked in securely behind the skid plate, the IRP unit increases capacity by 100 milliliters and cools the oil by a claimed 40 degrees Fahrenheit.
In our long-term quest to
cool our hot-running CRF450X, we've tried several
common mods aimed at achieving lower engine temperatures,
especially at trail speeds. It's carbureted rich, has a Boyesen Supercooler
water pump impeller and a left side Fluidyne
Radiator. Because the CRF also has low
capacity, we've run a Jagg
cooler from day one to increase
oil capacity and decrease oil
temperature. The Jagg unit is no longer available, so when it became
necessary to look around for a replacement we settled on an IRP
billet oil cooler. So far we are
glad that we did.
The IRP unit replaces the stock oil filter cover and bolts, in its place, directly to the left side of the engine. If you can perform an oil change, you can install this unit. There is no external plumbing to route and nothing to assemble. The IRP unit increases oil capacity from around 700 to 800 milliliters - a little on the low end for external coolers, but still significant. On the 450x, the IRP sits nicely behind an Acerbis skid plate safely out of the way. The only clearance issue I encountered was that the fins on the top leading edge of the unit contacted the rear of the thicker than stock Fluidyne radiator. I fixed this with an extra strip of aluminum tacked to the back of the radiator.
months of hard use, including
of Idaho, the IRP unit has
performed admirably. Though it looks
somewhat vulnerable to a left side hit, mine has taken more than it's
fair share of abuse without any damage. It's a stout hunk of metal that
tucks in securely behind most skid plates. I never worry about it. The
performance has been flawless.
Though the added oil capacity is less than that of the Jagg, the IRP unit is much more effective at cooling. The location is good for airflow, and the lack of external plumbing wrapped around a hot engine is a great benefit in keeping temperatures down. We did not have the time to test the IRP by itself, but I can report that the IRP, at least in conjunction with a Trail Tech Cooling Fan, works wonders at controlling engine temperatures on the CRF450X.
At $329 MSRP (I found one for less at a dealer), the IRP is a significant investment. But quality is rarely cheap. I like this unit and recommend it for anyone looking for extended oil capacity and/or cooling.
| IRP Billet Oil Cooler
$329.00 from IRP
The Good: Increases oil capacity by 100 milliters.
The Rad: Actually effective at oil cooling.
The Gnarly: Harder to stay warm when sleeping under your bike.