Quote:
Mildman wrote:
Brings me to an interesting question Mat
As I recently discovered an engine I purchased which I thought was an A15 turned out to be an A14, so far all it has cost me is the respect of my "datto expert mechanic mate".
From my understanding of the difference between the two engines the A15 is just a stroked A14...which should mean that the A15 will have more torque produced at low RPM, but will not manage to reach as high an RPM as the A14 - due to this longer stroke....
I'm think this means that an A14 will rev harder and thus produce good hp at the top of its rev range...sort of balancing it with the A15.
I'd like to see a dyno print out of an A14 and A15 side by side to really see the torque behaviour.
Has anyone studied this in much depth before?
We're talking normally aspirated here, so unless you're spending serious $$$, go with the A15. The difference is in the longer rods which equals increased stroke or displacement. Ideally, you want to oversize pistons if you've got the budget. A relatively stock A14 is not a rev meister, so you'd be wise to go for the cc's. Likewise, if you want a torque monster, go for a ka24, and don't waste your time with an A15.
Oh, and for the Americans here, make sure you use the A14 GX head and
NOT the A15 head. And you'll need a cam regrind since both the A14 and the A15 U.S. spec cams are designed for fuel economy and nothing more.
Transfer
