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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Oil Pump gear necessary for supercharger install?
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<blockquote data-quote="Airborne Roush" data-source="post: 1236098" data-attributes="member: 25799"><p>I have a Roush with 56k on it. The SC has been on it the entire time. Based on a ton of reading the oil gears are a good idea regardless, even more with a SC. There was someone on here that just blew his engine to pieces on a n/a. Ford's oil gears are junk. Period. The people that run lightnings (as you may know) and of course the mustangs are plagued with the opg problem more than we see. </p><p></p><p>After reading on here I thought it might be a Web MD thing where you look up your shoulder pain and end up self-diagnosing with AIDS. I couldn't find a quick yes or no. Some say yes change them others say no worries, then that dude blew his n/a truck apart. So I started reading and read a LOT. What I came up with is not from my experience but what I have read from many people. </p><p></p><p>Adding a SC into the mix really changes things up on the engine. That is standard for any make. Even guys with Miatas toast their oil gears when they start adding boost. It's about the harmonics. The stock damper can't keep up with the change in freq that a SC adds. If you read around there are tons of cases of oil pump gears failing after a SC. It's a roll of the dice really. The higher the hp and tq at the wheels, away from stock numbers, and those start stacking quick against you. </p><p></p><p>There are some articles that spell it out in more detail but in short your engine resonates at "x" frequency. The engineers find that freq and prescribe "x" harmonic balancer. That is what comes on the vehicle from the factory. Adding a SC changes that to "y" freq. The crankshaft driven oil pumps are subject to all of these vibrations. The tolerances on the oil pump gears are ridiculously tight. Half a 10 thousandth of an inch or .0005. With tolerances that tight any change can be a drastic problem. Add that to the finite flexing of the crank shaft and it's a recipe for failure. </p><p></p><p>The standard for most others, and it seems to help, is running a better harmonic balancer. I read a LOT about those too. They definitely help and I couldn't find a single case of opg failure after people run a quality damper like from ATI. After all the reading it looks like baseline after getting a SC is putting on a quality harmonic balancer. </p><p></p><p>Running a better damper doesn't fix the issue though it just helps mitigate it. </p><p>The real issue is weak gears not just the frequency changing. </p><p></p><p>All that being said I plan on making more hp to the wheels in the near future over the phase II Roush so I picked up a Super damper in addition to having the gears swapped out. That should solve the weak gear issue as well as help mitigate future issues. Oh... and I got the 12% OD damper so I should pick up 1-2 psi! <img src="/styles/default/xenforo/smilies/hat.gif" class="smilie" loading="lazy" alt=":hat:" title="Hat :hat:" data-shortname=":hat:" /></p></blockquote><p></p>
[QUOTE="Airborne Roush, post: 1236098, member: 25799"] I have a Roush with 56k on it. The SC has been on it the entire time. Based on a ton of reading the oil gears are a good idea regardless, even more with a SC. There was someone on here that just blew his engine to pieces on a n/a. Ford's oil gears are junk. Period. The people that run lightnings (as you may know) and of course the mustangs are plagued with the opg problem more than we see. After reading on here I thought it might be a Web MD thing where you look up your shoulder pain and end up self-diagnosing with AIDS. I couldn't find a quick yes or no. Some say yes change them others say no worries, then that dude blew his n/a truck apart. So I started reading and read a LOT. What I came up with is not from my experience but what I have read from many people. Adding a SC into the mix really changes things up on the engine. That is standard for any make. Even guys with Miatas toast their oil gears when they start adding boost. It's about the harmonics. The stock damper can't keep up with the change in freq that a SC adds. If you read around there are tons of cases of oil pump gears failing after a SC. It's a roll of the dice really. The higher the hp and tq at the wheels, away from stock numbers, and those start stacking quick against you. There are some articles that spell it out in more detail but in short your engine resonates at "x" frequency. The engineers find that freq and prescribe "x" harmonic balancer. That is what comes on the vehicle from the factory. Adding a SC changes that to "y" freq. The crankshaft driven oil pumps are subject to all of these vibrations. The tolerances on the oil pump gears are ridiculously tight. Half a 10 thousandth of an inch or .0005. With tolerances that tight any change can be a drastic problem. Add that to the finite flexing of the crank shaft and it's a recipe for failure. The standard for most others, and it seems to help, is running a better harmonic balancer. I read a LOT about those too. They definitely help and I couldn't find a single case of opg failure after people run a quality damper like from ATI. After all the reading it looks like baseline after getting a SC is putting on a quality harmonic balancer. Running a better damper doesn't fix the issue though it just helps mitigate it. The real issue is weak gears not just the frequency changing. All that being said I plan on making more hp to the wheels in the near future over the phase II Roush so I picked up a Super damper in addition to having the gears swapped out. That should solve the weak gear issue as well as help mitigate future issues. Oh... and I got the 12% OD damper so I should pick up 1-2 psi! :hat: [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Oil Pump gear necessary for supercharger install?
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