4.0" Stroke RPM Limits w/ Solid Roller
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From: Charleston, SC
4.0" Stroke RPM Limits w/ Solid Roller What kind of RPM are you guys turning to get out the big end with steel rods? Just wondering where the wear and tear starts really getting out of hand.
The reason I ask is the car is setup for 8th, but I would like to run one race next year that would require 1/4 mile passes. It's going through the 8th at 7300.
1.80 glide, 3.89 rear gear on 28x10.5 tire. I'm limited to the 28s.
Thanks.
The reason I ask is the car is setup for 8th, but I would like to run one race next year that would require 1/4 mile passes. It's going through the 8th at 7300.
1.80 glide, 3.89 rear gear on 28x10.5 tire. I'm limited to the 28s.
Thanks.
It depends on the design and quality of the crank and what power level you're at. There's a little bit of a discussion on this in another forum:
Factory crankshaft vs stock stroke china forged
Factory crankshaft vs stock stroke china forged
Piston Speed with a 4.00" Crankshaft Hi Foose, you ask about Piston Speed.
The 4.00" crankshaft at 7500 RPM = 5000 ft/min.
The 4.00" crankshaft at 7300 RPM = 4867 ft/min.
Both are extreme with MY maximum of 5000 Ft/min for Steel Rods.
The Piston Pin WILL PULL OUT of the pin boss unless the piston was ORDERED with "extra" material in the area.
I use DLC coatings on the Pins for this type of RPM AND very often for ALL race engines.
NOW, "tech" for ALL with respect to "high end" crankshafts, ASK for the Bob Weight (1850+) for standard weight steel rods & forged pistons.
The chance is great for a lower bob weight AND NEXT, the cost of that balance job = 1K+.
I use David, Marine Crankshaft, for a "high end" crankshaft including HIS knowledge of Engine Balance WITHOUT Mallory.
Lance
The 4.00" crankshaft at 7500 RPM = 5000 ft/min.
The 4.00" crankshaft at 7300 RPM = 4867 ft/min.
Both are extreme with MY maximum of 5000 Ft/min for Steel Rods.
The Piston Pin WILL PULL OUT of the pin boss unless the piston was ORDERED with "extra" material in the area.
I use DLC coatings on the Pins for this type of RPM AND very often for ALL race engines.
NOW, "tech" for ALL with respect to "high end" crankshafts, ASK for the Bob Weight (1850+) for standard weight steel rods & forged pistons.
The chance is great for a lower bob weight AND NEXT, the cost of that balance job = 1K+.
I use David, Marine Crankshaft, for a "high end" crankshaft including HIS knowledge of Engine Balance WITHOUT Mallory.
Lance
You will be fine. The callies rods all have pro2000 bolts which have less issue with stretch and a higher clamp load. As long as your bearing clearance is set up and you maintain oil pressure youll be fine.
Originally Posted by speedtigger
I have a 4" crank with a 6.125" connecting rod and my 403" LS2 sees 7500 RPM every time It drive it. I has been to 8000 RPM on a few occasions.
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