I did a search on this topic but the responses were old an all over the board. In typical club racing level about how long roughly for a top end on the motor and how long for a bottom end rebuild? How many bottom end rebuilds before the cases need replacing? Just trying to get an idea on this moto…

Thanks Robert! And I wondered about premix ratio…

Robert is right on. I sent in one of my motors at the end of last season for a top end, and it had about 15 hours on it, but probably could have been a few more hours. As Robert said, it was the end of the season and would give me a fresh motor to run our regional series with, and move my other moto…

Michael, Does SKUSA require that mix ratio? I know they spec fuel and Elf oil. I asked the question to IAME east and they stated stick with 16:1 even though the manual states 20:1.

Per SKUSA Rules Oil mixture: 1L of Elf-HTX 909 with 5G of VP MS98 (6.76oz per gallon)

Yes, as Matthew stated, 1L of Elf to 5 gallons of VP MS98L is spec from SKUSA. I’ve always ran my mixture at 20:1 (1qt per 5 gallons) or 18.9:1 (SKUSA ratio), but that is top of the line synthetic racing oils.

Disregard that deleted post. I can’t read apparently. :joy: My brain literally only processed half of what I read and quoted. :man_facepalming:

I guess I’ll buck the trend in this thread, but in exposure to 3 major engine shops for the KA I’ve never seen one of them recommend over 10 hours on a top end for a senior KA motor. General consensus is 8-10 hours for a top end and 20-25 on a bottom end. I don’t have exposure to junior motors so t…

I think that is another key to rebuild times, typical RPM range that the motor is ran. Higher RPM will require an earlier rebuild, and lower will last longer. However, I hate to say it, but builders make their money by doing rebuilds, so they will want them to be rebuilt sooner. One experience I h…

[image] Kutschca: I guess I’ll buck the trend in this thread, but in exposure to 3 major engine shops for the KA I’ve never seen one of them recommend over 10 hours on a top end for a senior KA motor. General consensus is 8-10 hours for a top end and 20-25 on a bottom end. This is about what …

I’ll add to this data point here. Chris and I have 3 KA’s from 3 “National” builders (comet / Woltjer / BBS). All recommend somewhere between 8-12 hours if you are competitive and run at the front. All recollect every 3rd-Ish top end to bottom end ratio. We have BOTH had premature failures in the 8…

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