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Nov 23, 2011 6:58 pm
Nov 23, 2011 6:58 pm
Subject: Power curve V12
Here is a power curve of a freshly restorated V12 engine of my friend Hans (W56). Attached also is a note sheet. I see ignition advance values on it and some other details. It has the standard 2 carb setup, I still have to check the camshaft profile they were using.
I had given Hans and his engine shop a copy of an article of David Hine from a Lagonda club quarterly in 2000 about cam profiles of the V12 and WO Bentley talking to him in 1968: "itīs the camshaft design, we never got it right" (or they just forgot that in the beginning they had it right...see Davids article)..
The test was run with the engine with auxialliaries but out of the car. I am pushing that as soon as the engine is back in the car he should do another test on a rolling road for comparison. After that everybody who is interested would be able to compare..
I have to say the curve impresses me: peaking at 143.3 kW = 194.8 HP, when I compare to the ones found in the books peaking at 156 HP for the standard engine. This power is reached because of a better torque curve.
No reason to attack engines nicely running but it may be interesting if your engine needs a complete overhaul anyway. Most of all it thrills me in combination with Davids article and what WO Bentley stated.
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Here is a power curve of a freshly restorated V12 engine of my friend Hans (W56). Attached also is a note sheet. I see ignition advance values on it and some other details. It has the standard 2 carb setup, I still have to check the camshaft profile they were using.
I had given Hans and his engine shop a copy of an article of David Hine from a Lagonda club quarterly in 2000 about cam profiles of the V12 and WO Bentley talking to him in 1968: "itīs the camshaft design, we never got it right" (or they just forgot that in the beginning they had it right...see Davids article)..
The test was run with the engine with auxialliaries but out of the car. I am pushing that as soon as the engine is back in the car he should do another test on a rolling road for comparison. After that everybody who is interested would be able to compare..
I have to say the curve impresses me: peaking at 143.3 kW = 194.8 HP, when I compare to the ones found in the books peaking at 156 HP for the standard engine. This power is reached because of a better torque curve.
No reason to attack engines nicely running but it may be interesting if your engine needs a complete overhaul anyway. Most of all it thrills me in combination with Davids article and what WO Bentley stated.
Attachments: