03-02-2022, 03:08 PM
A blown engine is okay in a sports Austin where accessibility to the engine is not a problem. In a saloon, the under-bonnet space will be tight and even routine maintenance jobs will be a pain. My Pytchley saloon had an engine with twin SU's and a bunch of bananas exhaust manifold. I have reverted to a single SU on a modified Ruby manifold. For a road car there is a lot to be said for a standard manifold and single carb.
I have previously had a blown engine in a special, using a Shorrocks C75B driven by a toothed belt. Maximum boost was about 5psi. The torque was very impressive. Power output was 32.5bhp at 5000rpm as measured on Stuart Rolt's dyno, which has been shown to be very accurate. The un-blown engine in my Ulster rep with it's trials cam and Ricardo head is not far off the blown engine as regards torque but is a whole lot simpler.
I have previously had a blown engine in a special, using a Shorrocks C75B driven by a toothed belt. Maximum boost was about 5psi. The torque was very impressive. Power output was 32.5bhp at 5000rpm as measured on Stuart Rolt's dyno, which has been shown to be very accurate. The un-blown engine in my Ulster rep with it's trials cam and Ricardo head is not far off the blown engine as regards torque but is a whole lot simpler.