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  1. #1
    Mike Greenwood's Avatar
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    Thermostat options Msx 150

    We have heard of members changing the bi-metal internal coolant thermostat. To clarify, would someone please explain the advantages to utilizing the differing temp settings. I would imagine that this unit is available at a local automotive supply house. If so, what model car does it go in? Please advise.Click image for larger version. 

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  2. #2
    ripcuda's Avatar
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    Stock thermostat for the Weber is an 82 deg C (180 deg F). Switching to a 160 deg F t-stat will let the engine run a little cooler... and should make more power (at the cost of engine efficiency and fuel economy). Same reason many turbo car tuners use a cooler t-stat.

    As for the size... it's not a regular automotive style. Nor is it the same as the sled engines (different cooling system) or other Weber engines. The MSX version is unique... there is some euro-only car that had this type of t-stat... but you won't find it at the local auto-parts store.

    Randy found a source. Just get one from him. I did a lot of searching and found one that had to be machined down to fit. Randy's are drop-in.

    http://www.weberpower.com/parts-webe...hermostat.html

    Cheers!

  3. #3
    Moderator HiPeRcO's Avatar
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    Is is possible/practical to change out the thermostat while the engine is still all assembled in the hull?

  4. #4
    ripcuda's Avatar
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    Quote Originally Posted by HiPeRcO View Post
    Is is possible/practical to change out the thermostat while the engine is still all assembled in the hull?
    Yes... can be done. Remove the coolant reservoir... thus draining the coolant system. Then you should be able to get to the t-stat housing elbow with hose connecting to the heat exchanger. A large c-clip holds the elbow into the housing... remove and pop elbow out. Then you can pull out the t-stat. Might have to remove one of the crimp clamps on the elbow hose to get it to move enough to get to t-stat.

    Cheers!

  5. #5
    hill160881's Avatar
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    Yes it is not that hard. But you do need to remove a fair bit of crap to get to it. The hard part is if they hit that area with a thick coat of paint

  6. #6
    Mike Greenwood's Avatar
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    Yes.... What Tracy said!

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