2.4 7R Mag Case Question

[jbell959]

Is there any difference between a 7R case from a 73 1/2 T CIS and a 7R case from a 73T Carb engine? I've heard the value of the 73 1/2 T cases is higher because they are rare.

Thanks

[Tyson Schmidt]

Rare does not always equal desirable. Take the 912E for example.

If it's a 2.4 7R case, then it's got the small spigots and all the 7R reinforcements, and has lived a less tortured life than a 2.7 7R case. But why a 73.5 T case would be more desirable than any other 2.4 7R case is beyond me.

The 73.5 T wasn't exactly a high water mark for Porsche in any category other than fuel mileage.

[jbell959]

Wayne's book mentions something unique about the cylinder spigot spacing on the 73.5 T 7R case....

[Tyson Schmidt]

It's not unique. Just any 2.4 7R case has small spigots and beefier cylinder bases. It's not just a 73.5 T thing, it's any 2.4 7R case.

[zotman72]

I know this sounds wierd, but it is true. My 72T 2.4 case, one side was a 5R and the other was a 7R in the casting numbers. I sent it off to Competition Engineering for preping when made it into a 2.4S motor a couple years back, noticed the descrepancy and was puzzled at the time. It was a late numbered '72 VIN.

[Bobboloo]

Unusual but not unbelievable. My 72' case is 4R/5R which is actually quite common. I had a 73' case that was also 4R/5R.

[svandamme]

Originally posted by Bobboloo
Unusual but not unbelievable. My 72' case is 4R/5R which is actually quite common. I had a 73' case that was also 4R/5R.

same here

[Jim Richards]

Really? Hmmm. My 73E was "born" in January 1973 and it's a 7R/7R case.

[svandamme]

mine was october 73

could it be that production was high, and they had to sometimes make due with what they got, resulting in cases not matching revisions ( the dimensions were similar, design was compatible, so if you need em , you just use em )

[Jim Richards]

Stijn, did you mean to say October 72?

[svandamme]

eeh, yeah