I decided to give this a go.
Partially due to some comments suggested in my own engine thread, partially due to me having been trying to work within constraints and compromises in any event, decided to put together this OHV motor.
I put a self imposed man hour limit of 100, and tried to more see how far I can go with the actual MTBF along with a somewhat reasonable fuel economy. This came an obvious cost of engine responsiveness. I could go further with economy and engine response, but a kick in the shins has been keeping limits on cooling.
Then again you learn something new every day and you try to figure out things regardless. I’m sticking with an OHV setup for the time being because I’d have to sit down some more hours to figure out an OHC setup (be it Direct acting, single or dual) properly in regards to working with a turbo AND managing heat.
If heat wasn’t a problem, I could easily put a reasonable 300bhp motor to these specs otherwise with less than 100 man hours…not that I’m bragging or anything.
If this was N/A, I could actually put together a motor for the power, although honestly I don’t know if I could meet the temperature requirements. I’d try now but my computer is crap and I might try later.
That said, here’s my first proposal, but not my ‘final’ one.
The first is again, an attempt at not just making the power, but also torque. However I’ve been trying to properly set up the turbo so it can spin to full speed earlier in the rev range.
But again, a constant problem has been the heat. If that was not an issue, I could put better optimization with fuel economy, power and response.
But then again, I’m sure in the eyes of others…there’s a billion things I could have done better. We’ll see.