chrisvega
Well-Known Forum User
In answer to Albrechts questions,
Early 71 US spec. with compression ratio of 9:1
Standard unmodified L24 block and head ( notes state stock cam and flywheel )
Documented low miles 36k with oil and filter change every 3k miles from new
Where are extra horses over standard factory Z ?
Pertronix ignition ( oops, I forgot about that ), Magnecor HT leads, 2.25 inch free flow exhaust / manifold, ITG filters/no box. Guess 10-15hp overall ?
My mechanical knowledge is pretty basic but assume on the road the limited slip diff will assist torque, not sure what effect if any that would have in rolling road situation although difference between torque at 4400rpm ( factory max ) and 5000rpm is very small.
I'm not competing in the willy waving contest going on here ( obviously ) and used the rolling road test just to re-inforce my feeling of confidence about how good the engine felt, check the Hitachi SUs were in perfect balance and record any potential power gains after any tweeking ( not needed in the event ).
Without going into then accuracy of rolling roads in general, I'm really happy with the outcome and agree on reflection it should not be used as any kind of arbiter for power output on a factory standard 40 odd year old car. Sounds like one of Rob's cars is much more standard spec. than mine, maybe his can be the guinea or patsy.
Early 71 US spec. with compression ratio of 9:1
Standard unmodified L24 block and head ( notes state stock cam and flywheel )
Documented low miles 36k with oil and filter change every 3k miles from new
Where are extra horses over standard factory Z ?
Pertronix ignition ( oops, I forgot about that ), Magnecor HT leads, 2.25 inch free flow exhaust / manifold, ITG filters/no box. Guess 10-15hp overall ?
My mechanical knowledge is pretty basic but assume on the road the limited slip diff will assist torque, not sure what effect if any that would have in rolling road situation although difference between torque at 4400rpm ( factory max ) and 5000rpm is very small.
I'm not competing in the willy waving contest going on here ( obviously ) and used the rolling road test just to re-inforce my feeling of confidence about how good the engine felt, check the Hitachi SUs were in perfect balance and record any potential power gains after any tweeking ( not needed in the event ).
Without going into then accuracy of rolling roads in general, I'm really happy with the outcome and agree on reflection it should not be used as any kind of arbiter for power output on a factory standard 40 odd year old car. Sounds like one of Rob's cars is much more standard spec. than mine, maybe his can be the guinea or patsy.