kabman Posted November 10, 2013 Report Share Posted November 10, 2013 My AHW engine's done 130,000 miles. While it runs OK it uses plenty of oil. I can get a low mileage AUB (100HP version) but I like the low speed torque of the 75HP AHW. I'd prefer a BBY but this engine's cheap.I know the cams and inlet manifold are different but I'm guessing the bottom end is identical. Anything else I would need to swap over to convert an AUB to 75HP spec? Are the compression ratios different? Quote Link to comment Share on other sites More sharing options...
Defcon5 Posted November 10, 2013 Report Share Posted November 10, 2013 The AUB has 2nm less than the AHW, yet 25bhp more.At increased RPM yes, but luckily you have a gearbox which is useful for controlling the engine/road speed ratio Quote Link to comment Share on other sites More sharing options...
kabman Posted November 12, 2013 Author Report Share Posted November 12, 2013 That doen't alter the fact that the AHW makes more torque at low engine speeds - which is what I want.I expect it's mainly due to the cams but would like to know for sure if there were any differences in valve sizes or piston crown/compression ratio.Also does anyone know if the AUB suffers from blowby/oil consumption like the AHW does. It's from a 2002 car, BTW. Quote Link to comment Share on other sites More sharing options...
Rich Posted November 12, 2013 Report Share Posted November 12, 2013 The engines these days seem to be pot luck so you're chancing it regardless.You could do it but making it run at 100bhp with your box would be the way to go. Quote Link to comment Share on other sites More sharing options...
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