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Break in engine on ITBs

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Hi everyone,

We have a freshly built V12 engine on throttle bodies that will be running on a new standalone ecu. The plan is to break it in on a dyno once installed into the car according to the HPA process as described by Andre. I am just wondering what to do regarding the balancing of the throttle bodies. I have set the butterflies equal with feeler gauges but I am aware that they will need proper balancing whith the engine running. However, I am afraid that spending the time balancing the throttles (all 12 of them!) while dialling in the VE map will ruin the initial break in procedure due to the need to hold a sustained RPM.

Would it be possible to run the engine in for an hour and not bother balancing until the break in process is completed?

Does anyone have any experience in this matter or any hints and tips?

Thanks,

Rob

I think that you tried to balance them as much as you could already without the engine running. My guess is that it is not critical to have a perfect AFR at every cylinder, but the break in is more critical. So I would say try to break in if the engine is running happily enough to do it, then properly balance the throttles.

I think that you tried to balance them as much as you could already without the engine running. My guess is that it is not critical to have a perfect AFR at every cylinder, but the break in is more critical. So I would say try to break in if the engine is running happily enough to do it, then properly balance the throttles.

Thanks for your feedback. Looks like we won't be starting it until the new year now but I'll reply to this thread to let you know how it went.