Stock Block Turbo Build w/summit rotating assembly
01-22-2021, 11:21 AM
#61
01-22-2021, 12:16 PM
#62
I've seen the same, fuel usage seems to track very nicely with whp on a dyno.
Good results! Thats right in line with what we see on a 5.3L on 30lbs from a box stock GT55 94mm, hopefully those summit parts are good for another 300 or so when they are leaned on. I have faith in the hard parts, less on the block and head clamping when you start pushing these things into that level.
Good results! Thats right in line with what we see on a 5.3L on 30lbs from a box stock GT55 94mm, hopefully those summit parts are good for another 300 or so when they are leaned on. I have faith in the hard parts, less on the block and head clamping when you start pushing these things into that level.
01-25-2021, 07:48 PM
#68
Nitrous Hey there, we spotted a few questions and we can answer. Summit Rotating Assemblies don't come balanced at this time but it's under consideration. Pistons are balanced to each other. Rods are balanced to each other. But the cranks aren't spun to the resulting bobweight. Balancing is almost always necessary because a dome dish or flat top along with the pin we use will rarely be the same as the factory combination. Also, once in a while we see folks take a rod/piston assembly and compare ours and the factory on a gram scale. This is incorrect and could lead to problems because the bobweight calculation takes into account rotating and reciprocating numbers (big end of the rod and bearings vs. pistons/pins/rings/clips.
As for the valve reliefs. the 5.3/5.7 heads are Cathedral port and laid back to 13 degrees for aftermarket or angle milled heads. 6.0/6.2 pistons are a combination pocket of Cathedral and LS3....laid back to 12 degrees for the better aftermarket heads. 7.0 pistons go one step further with cathedral/rectangle/LS7 reliefs.
As for RPM, we generally rate the cranks/rods/pistons at 5000 fpm. This is because a 4" crank at 7500rpm has the same piston speed as a 3.622 at 8,275. That being said, we fully expect Mavn to pull the lever when it noses over as most of our customers do!
As for the valve reliefs. the 5.3/5.7 heads are Cathedral port and laid back to 13 degrees for aftermarket or angle milled heads. 6.0/6.2 pistons are a combination pocket of Cathedral and LS3....laid back to 12 degrees for the better aftermarket heads. 7.0 pistons go one step further with cathedral/rectangle/LS7 reliefs.
As for RPM, we generally rate the cranks/rods/pistons at 5000 fpm. This is because a 4" crank at 7500rpm has the same piston speed as a 3.622 at 8,275. That being said, we fully expect Mavn to pull the lever when it noses over as most of our customers do!
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blackdak318 (01-26-2021)
01-26-2021, 12:47 PM
#70
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As for the rest of the pistons, we’ve maxed-out the ring land thickness and they are built from 2618 alloy. We’ve tuned the valve relief depth and CNC-relieved to avoid hot-spots. The forging itself has the best strength to weight ratio on the market by far. Please let us know if you have any questions.
