Re: Check this wild build style for Engine Masters Challenge '05
<firstname.lastname@example.org> wrote in message
> Background: This is the fourth edition of Popular Hot Rodding's EMC.
> This year it's stroker big blocks to a max of 514 ci. The engines were
> to have been built by approximately mid-July. Then all the entrants are
> to meet at a dyno facility, do some warmup pulls, then do three pulls
> for the money. Scoring is based not on peak output. Rather, the hp is
> recorded at various rpm points from 2500 to 6500, added, and divided by
> the total number of samples. The same for torque. The two averages
> are added for a final score. So a 650 hp average and a 600 lb-ft
> average would make a 1250 score.
> The rules require the use of 92 octane gas, but there's no penalty for
> massive amounts of ping, other than a DNF, and all the front-runners
> last year rattled like crazy. Heads and valve trains must be OE-like
> -- e.g., no 18 degree heads, no shaft rockers for Chevys. The 6500 rpm
> cut-off makes any higher rpm's pointless.
> The current Popular Hot Rodding has a long story collecting blurbs from
> each entrant who cared to give one. Just about everyone's going square
> or way undersquare. Everyone's running 12.5:1 CR or worse (or
> better?). But here's one build that's reaaally different, and I
> thought someone might want to comment on it:
> "The redo is a 4.485 stroke by 4.270 bore with a 400cc oval-port head,
> 99cc chambers, and a steamy inverted intake lobe cam with .744 lift and
> 254 at .050, and a big smoothie exhaust lobe around 296 at .050 with
> very low lift at .580. Lobe centers are very unusual at 126 degrees
> because my new compression ratio is 15:1. I can make this thing crank
> 170 psi and it will need to keep pressure low until it gets up a little
> in the revs. . . . Scores are going to be 1,294 with a 644 torque
> average and a 659 hp average."
> This is a Chevy motor, if that matters. The builder is Dan Crower,
> Bruce Crower's son.
> It's that cam that gets me. Well, a 15:1 CR for pump gas gets me too.
> But these cam specs: 254/296 @ .050, .744/.580, 126 LSA. I have
> never seen numbers like these. What's going on here? (I've never seen
> a 4.270 x 4.485 engine either, at least not since the 1930's.) And
> what is an "inverted lobe"?
> 180 Out
Got a link to this?
Al # 35