engine swap question

[mr2sc]

Hi guys,
Just need some confirmation/clarification please;
In case of an engine swap of say +25% increase (1.6l to 2l in my case), such a scenario no longer allows for the Displacement Calculation option? along with relevant Engine Modifications to be used??

It requires re-dynoing the car and using the Engine Reclass option instead?

Thanks

[paultg]

That is correct, although the dyno result is not a requirement. For instance I have a 1.8L miata motor in my older 1.6L Miata. I am using the stock 1.8L crank hp/tq numbers to determine my modification assessment, which is probably a bit conservative since I am running the motor with 1.6L ECU and Electronics.

So, if you know the hp/tq for the motor you are installing and you are not doing anything crazy to it (cams, intake, exh, computer, etc) and feel the numbers are accurate, you can go with them.

But, whatever numbers you decide to go with (dyno or not) you need to first convince the tech inspector(s) who ultimately determine the point assessment for the swap that the numbers are realistic, and also have to consider what your competitors might think. If a protest were to occur, you might need to provide proof (dyno plot, or other) that the numbers you are using are appropriate.

Paul G.

[mr2sc]

Thank you Paul. In either scenario I'd end up in T80, but because my +25% engine is modified a little, I better get a dyno run to avoid a discussion

Thanks for the clarification