1.7l big bore kit? 1972? Options

[jdlmodelt]

what is the biggest bore I can take my 1.7l to without major remods to the crankcase? recommendations?
thanks,
j

[Dave_Darling]

There have been 96mm P&C sets made for the 1.7s, which give you a 1911cc displacement. They are very thin to fit into the 1.7 heads.

The same kits made for the 1.8 give the same displacement, but are thicker. The 1.7 heads need to be cut to fit them. If you're going up in displacement, that's not a bad way to go.

Except for the 73 CA-only version, all of the 1.7s had relatively high compression (I think either 8.2:1 or 8.6:1) and were rated at 80 HP DIN. They require premium-grade fuel already; going up further in compression is probably not a great idea unless you can figure out how to make sure you don't get detonation.

The Tangerine Racing headers are good for something like a 10% HP bump. Make sure you're sitting down when you look at their price--but it's the biggest "bolt on" HP adder you can find, and they are absolute works of art. Chris also has an option for heat (probably just enough to de-fog the windshield) but most headers lose all semblance of heat. Which is an issue for some of us.

The 2056cc motor (a 2.0 crank and rods, plus the 96mm P&C kit that is made for the 2.0 motor) will bolt together with the 1.7 case, but again the heads will need to be cut to fit the cylinders. Everyone I know who has one of those motors is happy with it... For a while, at least, until the urge for more power hits. (IMG:style_emoticons/default/wink.gif)

--DD