Just a low-key challenge to give you something to do.
550 CuI’s (9013 CC’s - 9021 CC’s)
100 ft/lbs Torque per Litre or Higher
Fuel Injection
2 or 4 Valve (VVT/VVL unRestricted)
25% 505 lb/(hph) or Better
Emissions - 40 parts/million or Lower
75 Reliability or Higher
90.0 RON or Lower
500KGs / 1102lbs or Lighter
300 Man-hours/Production Units or Less
Post Picture Results.
Might wanna check your 100 ft-lb per liter buddy 
Presenting the 550 TT killer.
The 'Pushrod La-President
948ft-lb @ 2300
27.57% efficient @ .459lb/hp
83.1 reliable
37ppm
98.9 hours. Your new truck engine.
Haha totally missed that one. Been smoking too much apparently.
550TT [fixed]
haha - can’t believe I let that slide
Very nice OHV engine, btw. I’m excited for V10s somewhere down the line to make engines like that, DI OHV.
I suppose i’ll have a go. 
[quote=“Lordred”]Might wanna check your 100 ft-lb per liter buddy 
Presenting the 550 TT killer.
The 'Pushrod La-President
948ft-lb @ 2300
27.57% efficient @ .459lb/hp
83.1 reliable
37ppm
98.9 hours. Your new truck engine.[/quote]
That is one damn fine Pushrodder there.
This has proven to be a very interesting exercise for me, as I normally spring for high-revving engines with top end power. Also, I shall join in saying damn that pushrod engine is nicely balanced. I’ve used it as a performance benchmark to make something a bit cheaper, a bit more powerful, and a bit more efficient, but less reliable and with more emissions (though still quite low!)
It does spool a bit later than the most recent post, that >1000ft-lbs at 1900rpm makes me giggle.
EDIT: Also lolololol my 2000th post!? I didn’t even notice it creeping up on me.
Very good Strop, but your emissions are higher then the max allowed of 40!
Presenting, Pushrod La-Presidente II
Fixxed.
[attachment=1]La-pres2.jpg[/attachment]
[attachment=0]Lordred - Pushrod.zip[/attachment]
lolololol whoops I can’t read. Thanks for the heads up.
All that said, I decided hang it, let’s see what we can do maxing out the limits and going for 300PU, and bumping on the edge of the other limits too:
I did play around with the OHV too, and boy does it make a number of things easier. The maximum torque is a little less but it’s cheaper, more reliable and extremely capable in this application.
Will you guys accept my Tri-SO Vry-Hrd 3 Valve SOHC? (Rules state 2 or 4 valve, but what about 3 which is between the two?)
This one I went for the full 300 production units with.
[quote=“Lordred”]Will you guys accept my Tri-SO Vry-Hrd 3 Valve SOHC? (Rules state 2 or 4 valve, but what about 3 which is between the two?)
This one I went for the full 300 production units with.[/quote]
-Naw I meant one or the other but that's chill it's a good build.
Now convert it to a DA-OHC head and see what you can come up with…
Here’s what I put together. I went for low production costs as well as low man hours while still making over 1000 HP and ft-lbs of torque.
So I went back to the drawing board and decided to max out my Production Units since I left over 100 of them on the table with my last attempt. I came out with max performance and max economy variants. Here’s my most economic motor for this challenge:
I managed to get a higher economy by using a race intake (Around 33.43% IIRC), but I would have had a reliability rating of 71, so I gave up a fraction of a percent of economy for this practically bulletproof monstrosity of a motor.
My most powerful:
