Roger McDaniels wrote:
Ah, I was thinking single-cam. A stock CRX comes with a D16A6, and you can bolt a $50-$100 single cam VTEC (D16Z6 or D16Y8) head to it for a nice compression bump and a 20+ HP increase. That's basically what we do with the Duff car. It's not as good as a dual-cam motor, but it's pretty good for a single-cam and it's about as reliable as any other single-cam motor. A B16A in good running condition exceeds the allowed value of the car, basically doubles it if you include the transmission.
As for a B20, I don't see where it would be more reliable than a B18A/B, and it's probably less reliable than just about any other B-series with it's weaker sleeves and poorer R/S ratio, but it does let you use a dual-cam transmission, the worst of which is better than the best single-cam transmission, and you get more torque in a broader band than with any other B-series. Of course if you get the USDM B20Z2 or the JDM B20B, then you also get more top end than any of the non-VTEC B18's that would have been found in a US Integra, making it a pretty good upgrade for road-racing purposes, although it doesn't have as broad a torque band as the USDM B20B, so I'm not sure that the extra 16 HP is worth it.
I thought only the unicorn JDM P8R head flows better than the P75. But from what I have found 95% of B20s come with a P75 head, (same as B18), USDM or JDM. Did the later USDM Z engines have a better head? What is the head code?
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Mike Whitney
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