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Originally Posted by RC45
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Originally Posted by coombsie66
How often has he gotta change his rockers, followers, and valve springs?? 
All i know is the 5 litre ford pushrod in the 2 falcons im helping run this weekend has nearly that grunt, rev's to 7500 and needs top end rebuild after 50 ish hours of running or less! |
Big difference between those "pushrods" and these "pushrods".
These are not "old" engines. They are new engines with an "old" design, that turns out is not so old.
So you change springs every 20,000 miles... small price to pay for the performance and package you get.
And do not forget, ALL the uber exotics with these performance (and less) figures ALL require HUGE maintenance efforts at major milestone intervals.. |
Im by no means calling the design old, its just one way to go about the problem, mearly pointing out an inherent problem with the high revving pushrod set up, there being so much more mass and hence inertia in the valvetrain, therefore requiring stiffer springs (the ones in the falcon are tripples and the best made, still dropped one on an over-rev) The OHC's are not as susceptable thats all.
The falcon engine is literally a nascar engine (ford racing) just with fuel injection rather than carbs, its an aussie V8 supercar.
Its a pushrod too, and as for the question of it producing the same power as a 7 litre, the 7 litre in question is not heavily modified, and the torque curve of that will be a lot broader than the torque curve of the 5 litre, although its still a bit quick in a straight line this thing hehe, bye bye M3 GTR, Porshe GT3 RSR's oh dispatched a DBRS9 at a test day too (not the lemans one the newly developed GT lesser model). 8)