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Buell Forum » 1125R Superbike Board » Hildstrom rotor cooling method feedback « Previous Next »

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Wombat
Posted on Wednesday, April 20, 2022 - 08:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Gíday Buellers, wondering if anyone has any feedback on the Hildstrom rotor cooling methodÖhas it worked? Iím in the process of installing a Rickís hot shot stator & r/r to my Ď09 1125R which still has the original un-modified rotor in it, which has lost most of the resin sealant around the rim! Should I bite the bullet & buy a new one from Buell, or can I use a silicon sealant to replace the resin & do the cooling mods?
Ps, I know this question should be in the charging/electrical thread but keen for some feedback.
Cheers.
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Stevel
Posted on Thursday, April 21, 2022 - 08:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In answer to your query, yes it will help cool the stator, but it is not for free. I'm not at all sure that the volume consumed in that cooling is affordable in the oil pump's volume budget. I have not investigated it and I would not do it if it compromises the engine. It makes much more sense to swap out the factory shunt regulator to a series regulator and reduce the generated heat through improving efficiency. If you do not understand the function of both reg types, study that and make that change first.
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Coastrambler
Posted on Friday, April 22, 2022 - 01:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Steve has it right.
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Stimbrell
Posted on Friday, April 22, 2022 - 11:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I too had the resin missing on mine, repaired it with JB weld, still working years later.
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Wombat
Posted on Friday, April 22, 2022 - 07:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Steve, Iím familiar with shunt & series wired reg/refís and am fitting a new series unit as well as a new higher temp rated stator as previously mentioned. I was actually interested in peoples long term results that have done the rotor mods. The factory upgrade is actually a small hole that injects or squirts oil onto the stator so I donít think there would be a concern regarding the oil pumpís capacity. Mr Hildstromís mod is more about air flow than oil.
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Wombat
Posted on Friday, April 22, 2022 - 07:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Stimbrell, Iíll give that a go if I stick with this rotor.
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Stevel
Posted on Sunday, April 24, 2022 - 02:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

This is just a bit off topic, but I wonder why the cam bearing castings were not drilled for oil spray nozzles when the castings were designed to accommodate them. Especially if the oil pump was up to the volume required, hence my hesitation to use the rotor cooling mod.
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Ceejay
Posted on Tuesday, April 26, 2022 - 03:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Not sure why the hildstrom mod would affect oil pressure, as the hole size for the oil jet is not messed with. Oil pressure is not maintained by the rotor to stator interface.
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