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Max Power RP9 "Ultra Power"

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Max Power RP9 "Ultra Power"

Old 06-12-2022, 06:02 PM
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Default Max Power RP9 "Ultra Power"

does anyone have any experience with these engines yet?
has anyone seen them go?
is the run in procedure the same as all engines?



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Old 06-13-2022, 12:06 AM
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Sirio had a world winning AAC engine back in 2005. Picco and Novarossi did try the same, from what I know Picco never made a production version and Novarossi came with a 421 which started as an AAC model but changed later to the standard ABC. I know the JP R02 came with the same 421 based AAC model.

Aluminum is more difficult to get chrome plated but at the end it is much lighter than brass and dissipate heat much better.Break in is not different.
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Old 06-13-2022, 05:01 AM
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Quick question, how do they chrome plate only the inner side of the cylinder? Is the whole cylinder gets plated then outside gets grinded off? My question applies to all engine manufacurers.
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Old 06-13-2022, 07:05 AM
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They have a plastic holder to fit the sleeve to cover the outside parts.
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Old 06-13-2022, 07:37 AM
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Originally Posted by Roelof View Post
They have a plastic holder to fit the sleeve to cover the outside parts.
Makes sense thanks
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Old 09-13-2022, 11:33 AM
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how about life timing the AAC?
any experience?
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Old 09-13-2022, 12:14 PM
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It is never the sleeve that will worn out, it is always the rod, piston, piston clip or the bearing going first and damage the sleeve.
If he sleeve goes then it is broken due mostly vibrations.

With an aluminum sleeve that is no difference because the chrome layer does take the wear. But aluminum will loose strength when it is overheated so running too lean gives a higher chance to get a cracked sleeve.
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Old 09-13-2022, 03:55 PM
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6L through mine, very very fast and internals all perfect.

These engines run a lot cooler than your typical engines, maybe 20C deg less when I checked against my RP9.
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Old 11-10-2022, 12:14 PM
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Where can I purchase one of the “Ultra Power” units ? Does Max provide the “Ultra Power” in the 351-r variant ? I went to their site and didn’t see them , Wallace doesn’t have them on their site either . Thank you for pointing me in the right direction.
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