Oh, as far as speed, you should be able do do much better on flat ground depending on some things. What is your CR? A 7:1 motor will be slower for sure, especially with a lot of miles, so if that's what you have, then it may be normal. An 8:1 should do better than that. Where are you at? At higher elevations, advancing the timing helps a lot. At 7400' I ran 13 degrees BTDC. I had a shaved 8:1 head, so closer to 9:1, and had a header. Barring a head wind, I could easily do 75 or more on a flat stretch, even at my higher elevation. On the exhaust manifold, there is a valve thing inside with a spring on the shaft on the outside of the manifold. It is supposed to close off the exhaust when cold to help warm the engine up, then open when it's warm. If it's stuck closed, you will have less power. When I had a regular manifold, I just disconnected the spring so that it was always open.
__________________
Jim Hall
“That man has no respect for his Rover and beats
the hell out of it every opportunity he gets, taking
the most difficult line over each and every
obstacle.” Michael
1966 88" 1.9l VW TDI, GT1749V, IC
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