Quote:
Originally Posted by Dr Speed
I think we are bench racing now.
Where do we see that 300cc = 30hp at the crank.
Honestly goodluck with the build tho OP. I think you will have fun but will have the same experience I had with an N/A Boxer build. See below
To give you all an idea of real world numbers from my experience doing a full N/A build on a boxer engine:
My 1999 Boxster for comparison (now sold):
-Flat 6 Innovations 2.5 to 2.9 Big Bore Kit
-R&R Pro Billet Steel Rods
-JE Pistons
- Heads ported and polished
-Schrick Camshaft
- Aasco lightweight flywheel
- TRS crankshaft pulley
- TRS exhaust with Manzo header
Stock dyno 163rwhp, after 212rwhp..... SAE not STD for all the cheats.
^^^ so this is where I am coming from with my comments on where I think power will be. Its not apples to apples this is a H6 (6cyl engine). I spent a fair bit and I can tell you I was let down on the dyno and it was a bitch to tune. I actually first put down numbers in the 180's and 190's and ran for a few months at just over 202rwhp before I found someone to really dial in the car.
So my build was similar I'd say and its a boxer engine. Similar displacement increase.... everything got me about 45-50hp and no joke my tune was on the ragged edge of lean to make the numbers that I did. So if we look at the fact that the FA is a 4 cyl, will be 2300cc's... I dunno but by my math I don't see it gaining more than 40-50rwhp from a full N/a build. Regardless of redline. Just because you rev an engine to 9,000rpm doesn't mean it makes more power that late in the rev range
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I know where you are coming from. Although I do not know the Boxster engine very well it is similar in design. I had a somewhat equivalent experience with a junk yard build.
EJ22 with EJ25 crankshaft. Stock Rods Custom 11:1 pistons to compensate the longer stroke = 2.41ltr
Base EJ22: 135 bhp/Torque 137 lb·ft
After the engine build it made 148WHP and
158FtTQ (
BUT all we did was adjust fuel AFR no timing adjustments)
So for 200cc's we saw a 30 Crank HP jump estimating a 12% drivetrain loss.
I think the Variable cam timing in the newer engine vs the older EJ may be able to dial in a bit more power.
I also had a friend with a Very high compression 14:1 EJ25 pull a corrected 308 HP in NA form. But he was on race gas an only used for AutoX