The books differ; I’ve seen many that list the early ones at 180 too. I’m told and seen in Anderson’s book that the big difference is in the cam timing. Early SCs are timed a couple degrees different than later ones. Not dizzy timed but cam timed. Likely why they seem to pull harder at higher RPMS. I’ve also read that the early SCs have bigger ports or runners or something? Supposedly all 2.7, SC and 3.2s have the same cam profiles. Though timed different in some cases and let’s not forget the 3 vs. 4 journals. Again Anderson said the 3.2s split the difference in cam timing. 964 cams are suppose to be a good upgrade on the earlier engines but no one seems to do just that, so actual numbers seem sketchy at best.
Might be interesting to get a base line on DAS COUP with the SSIs and Ben muffler. They really seemed to help the low and mid range. Then retime cams to early specs. Lots of work for 3-5 top end HP but interesting just the same.
It would also be nice to find the real differences between the later Euro SCs (204) and US (180) ones. I wouldn’t think the half point in compression would make the 24 hp differences. Might be the combination of the CR, early CIS and cam timing but I have never seen anything concrete and haven’t the patience’s to go line by line in the PET. Most original Euros I’ve seen had air pumps and cats so what’s up with that?
|