Where to go next for more power on TS 8v
I've been building up an 8v TS for my GT Junior for a few years and finally got it on the dyno.
It's got a lightened crank, standard rods, Spruell JE pistons 10.5CR, total seal rings, it's on Jenvey 45's ITBs with an Emerald ECU and twin ford coil packs. Alfaholics inlet/exhaust. I can't remember which Cams I used, I recall they were Billet from Catcams and probably around 12mm lift, lost the specs :-(
The head still has standard valve sizes (44/38mm) but was CNCed by the guy who used to do the Illmor F1 engines, he also goes the Caterham CSR engines. The flow rates are as follows:
At 12mm life Baseline Exhaust (as he got the head) 75.8cfm, now 84.9, 12% gain, inlet was 98.9, now 117cfm, 18.3% gain. Going up to 15mm lift on the inlet, 123.8cfm was achieved (22% gain).
Power and torque graphs on the dyno attached, I was hoping for nearer 190bhp at the flywheel. Transmission losses on the graph seem quite low but not 20bhp too low...
However torque curve looks very flat and the graphs are really progressive, he said the fuelling is no where near maxing out. In his opinion the place to look for more power is with different cams and more RPM.
I have a set of Spruell Carello rods that could be put in on an evolution 2 build...