Paul... Stroke is 4.325..bore is 4.1875=496 cu in Not 4.125 and 4.375.
5.62 rod length thats 1.38 in. shorter than our 7'' and trying to point out to our readers.
We redline the engine at 7500 rpm [ not 9000
] with our gearing =340 mph
rpms on our 294 avg at the 3 mile [1st time mile] and 318 indicated speed at end of that mile.
1st gear 5900 rpm-throttle position - 31%
2nd 7450 tps - 39%
3rd 7100 tps - 47%
4th 7000 tps - 100% after shifting into high gear.
Gearing 1.85 overall with 28'' x 10'' goodyear tires but figure 1'' tire growth at 29'' =318 at 7000
and 340 mph at 7500.
Paul this is why you need a lot of power at Bville, to be able to accelerate after you get traction when the course
is going by at a fast rate.
We lost a piston on this run because the piston was machined with not enough metal left at bottom of ring grove
were piston skirt narrows down resulting in blowing out of ring stack into inside of piston.
I'am fairly convinced that our rod failure this year was because of our last minute trash of tearing the engine down and reassembling it. Laying under car to tighten rods [ manufacture wants one side tightened compleatly
in one steady pull then other].
Beach marks on rod looks like it pulled apart over time lengthing rod allowing piston to hit head and jamming
ring lands. This destroyed ring sealing allowing ignited supercharged gas to blow a hole in piston from intake valve side. FAST efi does a great job of correcting air fuel ratios at partial throttle and was in low 10s and even in the 9s at times. Max boost this year was 16lbs
We like to hold the engine speed below 7200 rpm but in high gear at least 7500
JL222
Adding this 1 hour later
Paul with 4 sec times that must be 1/8 mile strips.
Was that 7.5 rod chromemoly?