Quote:
Originally Posted by DavidVizard-GFN
Flow Specialist, Cammer, Want-a-be, Mach 9 and Lasse,
My guess here is that in spite of sounding contradictory you are all right!
DV
|
Seems to me we were all saying about the same thing anyway. Well maybe except a slightly different take from Cammer.
I agree with you that only in very extreme cases, F1, Prostock etc, is it worth spending so much on bottom end prep. Grumpy had it right 30 years ago that the best possible bottom end prep showed comparatively little benefit for the effort compared to head work where the difference between good and bad could easily be 100 bhp.
Personally I've never had a block line bored in my life. Never seen the need. Never used a torque plate either. When you look at how out-of-round wet liner engine liners go after a few miles without apparently affecting cranking pressure or power you begin to wonder if piston rings are really that fussed about sealing to something with a minute amount of ovality. I've pulled apart Peugeot engines with 4 thou ovality on the liners (which actually disappears if you leave them on a shelf for a while for the stresses to dissipate) and they perform as well as iron block variants running the same tuning bits.
I think on small engines such as we use over here you're hard pushed to spot the differences on a dyno between best possible and 'decent' bottom end prep. On a 700 bhp V8 it's easier to see them but in percentage terms they're still negligible.
If 1 or 2 bhp is worth $1000 to you then by all means go the whole hog.
Dave