Re: Is It Worth It?
S1.5 E-types were from the outside identical to the earlier 4.2 models except for the lack of covered headlights as mandated by the Feds. The engine however is quite different in that the S1.5 had the same 4.2 XK engine but it had been neutered to some extent by the same Fed- mandated 1968 emissions regulations. The S1.5 motor has dual Zenith-Stromberg carbs instead of the triple SUs. It also has a heat exchange crossover pipe that pre-heats the fuel/air mixture prior to combustion.
By most estimates, the S1.5 motor was robbed of 10-15% of its power due to this setup. The good news is that, for a significant financial hit, you can retrofit the S1.5 engine to pre-'68 specs with the addition of triple SU and manifold and attendant hardware and bits. I did this and I now have a VERY fast and very smooth S1.5 roadster.
The other differences were in the interior appointments. The toggle switches were also mandated out of existence and replaced by rocker switches. They work the same and are in the same locations but they are less reliable (and less British looking)in the long-term than toggles. The S1.5 had no armrests on the doors, the S1 did. The S1.5 had a locking glove box, not the S1.
In terms of handling dynamics, mechanics, suspension, smile factor, the S1.5 is identical to the S1. Although I would like to have the covered headlamps because they look cool, they were inferior to the S1.5 open lights because they distorted the light beam and gave out a less focused and dimmer light. Thus, another Fed-mandated safety issue that actually meant something. Other safety related S1.5 differences included using brushed chrome on shiney chrome surfaces to reduce sun glare. The wipers are brushed chrome and horn push bezels on S1.5 are blacked out. Oh, the knock offs lost their ears in '68 too - safer they said.
There you go. More than you ever wanted to know probably. BTW, if you wanna see my car, and other neat stuff too, check out my new (under construction) site at
https://www.cooperguitars.com
Best to all
Randy Harris '66 BJ8, '68 OTS /ubbthreads/images/graemlins/savewave.gif