JIMS® Heat Sink Cam Cover

By definition, high performance, big inch motors run hotter than smaller, stock displacement motors and need more air to reduce their running temperature. A new and simple idea from JIMS USA, in collaboration with Cornerstone Metrology, is to let outside air flow through a nice looking “fin pack” design that you fit into the existing stock cam cover.

Installation uses the existing timing cover hardware and only takes minutes. JIMS® Heat Sink Cam Cover is manufactured from top quality aluminum here in the USA and is available in Chrome Plated, or RawCut Black, MSRP from $74.10 to $98.50, depending on finish. For more information call 805-482-6913 or visit JIMS USA.

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12 Responses to “JIMS® Heat Sink Cam Cover”


  1. 1 Cris Jones Feb 11th, 2011 at 12:24 pm

    Jims always bring very practical ideas and tools.

  2. 2 Ksw Feb 11th, 2011 at 7:38 pm

    I didn’t see this on their site under What’s New.

    The question is what testing was done and how effective is
    it at doing what it claims to do, reduce running temperature.

    How about some numbers? Without stats its just a Cam Cover with holes.

  3. 3 Wiz Feb 12th, 2011 at 5:12 am

    Looks like a good idea, somebody’s thinkin’ in this crazy world! Wiz

  4. 4 Buck Private Feb 12th, 2011 at 11:30 am

    What else would get in besides air?

  5. 5 zyon Feb 12th, 2011 at 12:21 pm

    Buck, my thoughts exactly. This sounds great and common sense would tell you it would drop a few degrees but what about the occasional ride through the mud puddle or in the snow…what about the bugs? Seems like it could cause more damage than good. I too would like to see some “real world” numbers in this piece.

  6. 6 Dr Robert Harms Feb 12th, 2011 at 4:24 pm

    The idea is logical but I don’t see where the air actually goes THROUGH which would be needed (??) for heat transfer. BTW, the new Confederate/S+S motor actually has large thru holes in the case which (I assume) are for the same purposes.

  7. 7 J Feb 13th, 2011 at 12:40 pm

    Hmm- JIMS is typically smarter than the average bear, so I doubt he brought something frivolous to market… As far as venting, the engine oil is already vented, don’t see anyone freaking out about that….. Air flow? The engine is a pump, produces plenty of its own airflow, I would imagine- looks like an air-out, not air-in design to me…

  8. 8 Grayhawk Feb 13th, 2011 at 1:13 pm

    Doc don’t believe its for air in; its for heat out and the air flowing across the fins as you fly down the road not so different than fins on a cylinder or the oil cooler and/or a radiator on the front of a bike so equipped to let the air flow across the their fins to cool or dissipate/transfer heat if you will,

    Surely wouldn’t work idling on mainstreet but any means of dissipation of heat couldn’t hurt unless your running in frigid conditions but the cooling median is the air flowing across the finned surfaces based on my understanding of a heat exchanger or heat sink.. A side view pic might be more telling on surface area that may or may not protrude out. No bad product ever from Jims that I am aware of.

  9. 9 Ted Feb 14th, 2011 at 10:02 am

    Kudos to JIMS for another nice looking product. I think the name “heat sink” is more descriptive of the design than function. Under the timing cover is an empty cup. There used to be points and timing adjustment in there. JIMS heat sink cover will let some heat out of the cup but the drop in oil temp would not be measurable. I store an extra key in that cup, the key would be cooler 🙂
    Still a great design that looks functional and makes you motor look bad ass..

  10. 10 Paul Feb 14th, 2011 at 2:33 pm

    Guys –

    Generally speaking you are all correct.

    The insert is not only meant to “help” cool, but also “look cool”. When installed, we saw Cam Cover Surface Temperatures drop approx 10 degrees. We do not boast that this product will drop your “oil temp” significantly, it just helps reduce temps.

    It’s a blend of function and styling.

    Stay tuned, we are testing and have some products scheduled to release in 2011 that reduce operating temperatures significantly.

    Ted… As for your key, have you seen the JIMS bike pocket?

    Paul

  11. 11 jatinder pal Feb 15th, 2011 at 8:29 am

    Jims is one of the best companies out there….the product is good again.

  12. 12 Keith Sep 3rd, 2011 at 11:45 am

    As the CO-Designer, I am pleased with the reports from the people that I have sold these to. I just got a phone call from UTAH from my cousin , Mike Chauvie. He just sold one to a guy that he rides with. Mike has a different method of marketing these. He simply pulls up and parks next to others that have just pulled up and parked and ask people to “touch your cam cover” – “now touch my cam cover” Wow is the usual response. The one that he sold to his friend has a Harley digital temp gage in his dip stick. After a stop and go ride at 98ºf ambient temp, before and after installation of his heat sink, he observed a 10 ºF drop in his oil temp on his dip stick. This is beyond my expectations. My original target was to remove some temp from the Cam Chest and nothing more. Now I have to go now cause I damaged my shoulder trying to pat myself on the back.

    GREAT JOB PAUL – your design contributions have paid off.

    As far as people worried about mud and bugs getting in, This cavity is sealed and has not been used for anything since removal of the cam sensor after 1999.

    As far as air flow, ten 3/8″ holes drilled through at 36º intervals, 5 completely thru, 5 terminate at the mounting flange. progressive angle fins and the 5 thru hole generate a gentle turbulence inside when
    any air passes the velocity stack style opening.

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