Hello everyone,

I am toying around with the idea of switching from EP to XP with my Datsun 510. During this process the obvious engine choice is the Nissan SR platform. Of course the most common is the SR20.

By my understanding of the 2014 solo rulebook, the minimum weight calculation is as follows:

1. Four-stroke cycle and two-stroke cycle, naturally aspirated, internal combustion engines will be classified on the basis of actual piston displacement.

All weights are calculated based on displacement as listed per Appendix A, 9.a.

Example: Weight for a RWD car w/ 1796 cc Turbo engine behind the driver is:

1200 + [(1.796 x 1.4) x (200 + 20)] = 1753 lbs.

Now, My question is the following.

Per my interpretation of this SCCA rule, the Nissan SR20 has a stock displacement of 1998cc’s.

Taking the literal interpretation of the rule, 1998 cc’s is NOT 2,000 cc’s or greater.

Therefore, the minimum weight calculation for a RWD powered SR20 vehicle in XP would be as such:

1200 + [(1.998 x 1.4) x (200)] = 1759.44 lbs.

**To clarify, the car has no abs, T/C, is front engined, and no active/reactive suspension.**

My reason for bringing this up is that with the previous statement an SR20 long block is eligible for the following weight formula, since it is calculated for Actual piston displacement.

Can anyone confirm my interpretation of the rules? And if someone says nay, whats stopping me from building a small 1.9L SR frankenmotor? How close to 2000 cc’s can one get without tipping over the scales by this ruling?

Thanks