it has come to our attention that some of the aircleaners have been getting hot and cracking by the spigot mount of the aircleaner. i had a chance to see one of these failures and believe i have found the source of the problem, some hoods are pressing down harder than others on the airfilter. the heat itself isn't so much of a problem as is the hood pushing on the air cleaner causing it to crack. the fix is to make afew adjustments to get more hood clearance for the aircleaner, and to shorten the inlet spigot of the turbo that the aircleaner mounts to. (it's over an inch long, and only needs to be 1/2'' to 5/8 " inch long) this extra length going inside of the filter makes a ledge for the hood to push down on and cut the filter. by removing this ledge from shortening the spigot, the filter can flex as it would normally and has nothing to cut at it. you could also use a heat insulator tape for an extra measure of protection that would go between the turbo and the aircleaner. i have a sample of this coming in for testing and i will inform you of the results with and with out it, my feelings now is that the heat isolator tape will not be necessary because you can see its the longer than need spigot that is creating a cutting surface, and excessive hood pressure that actually causing the aircleaner failure. for more details please contact jeff simon at simons cpr on tueday. 
have a merry x mas. jeff
have a merry x mas. jeffgrauser
Extreme
Jeff,
I tried a different approach. I raised the rubber hood stops. This way the hood doesn't hit the filter quite so hard and the 3/4 "opening at the rear will let some of the heat out.
Doesn't hurt the appearance and you still can't tell it's a turbo.
Also I did the oil line orfice mod yesterday. It worked great. Without the pilot jet in there "that's alot of oil coming out of that line" !!!
I tried a different approach. I raised the rubber hood stops. This way the hood doesn't hit the filter quite so hard and the 3/4 "opening at the rear will let some of the heat out.
Doesn't hurt the appearance and you still can't tell it's a turbo.
Also I did the oil line orfice mod yesterday. It worked great. Without the pilot jet in there "that's alot of oil coming out of that line" !!!
raising the rubber hood stops is a great idea gary, our high flow oil line itself will flow lots of oil when just open to atmosphere because the restrictor is in the turbo itself. i think garrett changed that size restrictor in the turbo causing the issue we are seeing, thats why we're putting our own restrictor in the oil line just before the turbo. there is a huge change in out flow from the oil line as you've seen. now we control the oil flow, not garrett. jeff
jeff
I don't think that the hood is the problem. I run a Diamond S hood, and it doesn't even come close to hitting the air filter. There is over 3" of room between the hood and the filter and the flange on my filter broke/melt, and with the mesh there is no possible way of getting air flow other than no hood. I fixed the air filter problem myself. I think for mountain riding the air filter needs to behind the headlight area on front mounts.
red, can you email me some pics of the aircleaner that failed?, i agree at hi alt we will need an isolator for the filter. but sealevel may be different. let me know how you testing goes, i appreciate your input. jeff
Similar threads
