Paul,
Running the engine at 2000 to 3000 rpm and just leaving it there for 20 minutes
is usually suggested as the right way to break in a new flat-tappet cam and
tappets but my understanding is that this will not to much for your rings.
The following applies only to piston ring break-in and is not specific to TR
engines (and I?m certainly open to hearing scientific reasons why this might be
incorrect). I do lots of throttle on/throttle off to load the piston rings in
both directions, so to speak, so that means a few laps of rather jerky driving.
If the roughness profile of the cylinder walls was done properly it shouldn't
take more than a few laps to bed the rings. It would probably be a good idea
to change the oil and filter after the first hard track session.
Duncan
> On Aug 25, 2018, at 12:20 PM, Paul Ricco via Fot <fot at autox.team.net>
> wrote:
>
> FOT,
>
> Good afternoon and we hope everyone is having a great weekend.
>
> We have a couple questions for those who have had experience and success
> building TR4 race engines. The information might be helpful others on the
> forum as well.
>
> 1. We have seen a few different recommendations for initial run-in. They
> seem to range from 5 minutes to 20 minutes at approximately 2000 RPM?s. How
> long and how many RPM?s are people running them for?
>
> 2. How long are people leaving the break-in oil in the motor?
>
> a. Are people taking out the break in oil right after the run-in and
> replacing it with regular oil before leaving for the track?
> b. Are people running a few sessions under load at the track with it
> in and then switching?
> c. Something else? If so, what are you having success with?
>
> Again, we are really gearing the questions towards race engines due to
> complication of breaking in the race motors at the track with limited time
> and the track session schedules.
>
> We are trying to avoid re-starting the entire referendum up on oil brands
> again, so we apologize if we do. We are really trying to get to how people
> are breaking-in the TR4 motors successfully.
>
> Thank you for considering my questions,
>
> Paul Ricco
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