We recently had a failure of the stock'ish engine in our 2001 Acura Integra Type R race car. The good news is we have a 2nd engine that was recently freshened up by Jeremy Allen at Allen Built Engines. This engine was built for fun more than anything. No rules in mind, no horsepower goals other than more than stock and reliable.Â
It's a sleeved B18c5 Engine. Using a 84mm Bore and the standard 87.2mm stroke crankshaft it comes out to a 1.93L engine. Bigger than stock but still an engine that can turn the ITR expected RPM. The compression ratio is around 11.5:1, pump gas friendly and it has a pair of stage 2 camshafts installed with Supertech Performance valvetrain. Tuning of the Motec M130 was done by Rob Reinen (GreenGoTuned) on 93oct pump gas.Â
Overall a solid powerband. It made great torque numbers and held way out in the RPM band. (207whp, 148ft-lbs torque) Those are the things that will be noticeable on the track.
We do recognize we have some bottlenecks in the system to maximize the horsepower. But maximum horsepower was never the goal. The CT Engineering air box is a limiting factor. Our of curiosity we pulled the air intake tube from the airbox and picked up 4hp throughout the entire rpm band. Definitely power to be had with a different intake setup but I love the way the CT airbox looks in the engine bay so it will stick around for now. We are also probably chocking the engine a bit with the PLM TA header. A header with larger diameter tubes would most likely see a good gain, but the PLM TA header offers the best ground clearance and radiator clearance in the engine bay. These are the trade-offs we have to deal with.
Looking forward to putting some track miles on this engine soon. Should be a blast and hopefully a reliable runner for us.
