Von Writter
Well-known member
Hi All;
I have had an engine built for my WWI German Fighter replica and I was wondering if some more knowledgable person than myself can give me a solid idea of how much more power I can expect from the motor (torque is the key here) from the modification I had done. They are as follows;
1 It is a 250cid. with 9.2/1 compression
2 It has a clifford port divider in the heads which have been ported and pollished with the larger SS valves installed.
3 a custom header with only about 4' of 2.5" exhaust pipe and a Dynaflow tube muffler and a CC insert.
Carb is a side draft Zenith carb, about 200cfm, but note this engine will not be reved over 3200 rpm!!! so that should be enough flow for the lower rpm requierments
4 The bottom end has a Comp cams 260H cam .440 lift, 260 deg @ .050 212/212 Lobe spread 110
5- the recipricating parts including the harmonic balancer and billit Aluminum flywheel hve been statically and dynamically (spin) ballanced.
6- All engine components except the castings are new.
Any idea how much more torque (gross) I will be able to realisticaly expect? I'm hoping for 300 at 3100 rpm. Is that to optimistic or pesimistic?
Any help will be very much appreciater.
Thanks;
Troy Wright.
I have had an engine built for my WWI German Fighter replica and I was wondering if some more knowledgable person than myself can give me a solid idea of how much more power I can expect from the motor (torque is the key here) from the modification I had done. They are as follows;
1 It is a 250cid. with 9.2/1 compression
2 It has a clifford port divider in the heads which have been ported and pollished with the larger SS valves installed.
3 a custom header with only about 4' of 2.5" exhaust pipe and a Dynaflow tube muffler and a CC insert.
Carb is a side draft Zenith carb, about 200cfm, but note this engine will not be reved over 3200 rpm!!! so that should be enough flow for the lower rpm requierments
4 The bottom end has a Comp cams 260H cam .440 lift, 260 deg @ .050 212/212 Lobe spread 110
5- the recipricating parts including the harmonic balancer and billit Aluminum flywheel hve been statically and dynamically (spin) ballanced.
6- All engine components except the castings are new.
Any idea how much more torque (gross) I will be able to realisticaly expect? I'm hoping for 300 at 3100 rpm. Is that to optimistic or pesimistic?
Any help will be very much appreciater.
Thanks;
Troy Wright.