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On 18 May 2003 at 23:30, Shad Laws wrote: > Jim wrote: > > Porsche made a number of changes to the type 4 engines they used. I've > only > > heard about these and can't verify them first hand. The ones I've heard of > are > > that the fan hub and flywheel are castings on the VW engines, while they > are > > forgings on the Porsche. > The flywheel, yes, but not the fan hub. I agree that it seemed strange, but that's what Gary Berg told me when he was describing how they have to use different welding rods when welding the fan to the hub on different type 3 and type 4 engines. I believe that he claimed that the type 3 and Porsche type 4 hubs were steel, but that the VW type 4 fan hubs were cast iron. I quoted him wrong above. I should not have used the word forged. > > I believe the change from 1700 to 1800 was an increase in bore, while the > > change from 1800 to 2000 was an increase in stroke, so upgrading from 1800 > to > > 2000 is expensive, requiring a new crank. If you're thinking about going > this > > direction, look for a 2L to start with. > > Odd as it seems, that's not the correct chronology. First, there was the > 1.7 (90x66). Then, there was the 2.0 (94x71). It was first developed for > 914-4 to replace the 914-6 in 1973, and was later detuned for bus engines in > 1976. In 1974, the 1.7 was upgraded to a 1.8 (93x66). Yeah, you're right, and I never think of it this way. But, to be fair, I wasn't really talking about the cronology, just the "logical" progression. > > You should also know that repair parts for the 1800 are much more > expensive > > than either the 1700 or 2L, so that is another reason to avoid it. > > They really aren't more expensive. Only the P&C are really unique. To > replace them, bore out the cylinders to a bigger size and get different > pistons. 93-96mm cylinders have the same register - only the 1.7 cylinders are > smaller (and unsuitable for a reliable overbore to 96mm). Things like gasket kits and small parts that were unique to the 1800 really are quite a bit more expensive. It seems to me that an 1800 gasket set was something like 2x the price of either the 1700 or 2L kit. That's an old memory, and I wasn't shopping around, I was just buying from someone here who specializes in type 4 stuff. I thought it was reasonable when I realized that there were probably many more 1700s and 2L engines made than 1800s. What do you mean by "93-96mm cylinders have the same register?" I just don't understand the statement. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org