You are reading a single comment by @Hefty and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Hefty
I suspect I've been well and truly out-done, turning up in a Volvo estate is not going to cut it when the other visitors are turning up in V12 Ferrari's.
With regards to my engine there are a lot of unknowns - but that's why the heads have spent eight hours on a flow bench, and why the designer has both a full intake and a pair of tubular exhaust manifolds, so he can calculate exactly what cam profiles we need.
The camshafts in the 3.4 (which I have) are shared with the 2.5 - and if we kept them unchanged when we go to 3.7 litres then we'd be using camshafts that were designed to operate an engine almost a litre smaller in size, which would not be using the new capacity to its best advantage.
Unknowns currently concern the throttle body to use, I think that the exhaust side of things would be tubular (FVD style) tubular manifolds, 200 cell cats and the current Cargraphic sports exhaust. I'll need to check that we have enough injector to give us safe headroom, the goal is to achieve both a strong, linear delivery of power from idle and (in have your cake and eat it style) hit a volumetric efficiency figure of 100 bhp/litre.