2 bolt main block
06-12-2008, 11:41 AM
#2
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Join Date: Oct 2007
Location: Denton, Texas
Posts: 374
If your talking about a 2 bolt main lt1 block they can handle the power. However, power is not the issue with 2 bolt mains rpms are. The crank begins to walk around at high rpms. Anything above 7000ish rpms is pushing it with 2 bolt design. But i do know people that shift AT 7 grand with rebuilt cam only lt1 with no troubles. It always a good idea to invest in a 4 bolt splayed main when building a motor.
06-15-2008, 02:32 PM
#3
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Join Date: May 2008
Location: Sheboygan, WI
Posts: 856
on that note. what are some factors that will decided max rpm?.. we know already the 2 bolt main is not to safe past 7K, what else effects it?.. (im not talkin about powerband, shift points, where power is made - since that changes with cams) I am talkin about pure rpm limits. crank? or will any crank spin just about any speed?.. rods?.. clearences?
Thanks
Thanks
06-19-2008, 05:04 PM
#10
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Join Date: Oct 2001
Location: Engineerland
Posts: 1,517
Usually what defines max safe rpm assuming the oil system is up to part and the valvetrain can take anything. Is the mass of the piston, pin rings and little end of the rod. These factors all go into the stress that the rod bolt deals with.
You know that comercial about the ford truck bed bolts where they talk about how tough they are, well a super exotic race quality rod bolt is like king kong next to a dozen of those working together to support the same load. They are the most highly stressed parts in the system followed by the piston pins, and the rods are shortly behind that. All are supporting very similar loads, but the rod bolts take it all, the other components are much larger and only take a fraction of it.
This assumes you got everything else in the motor perfect including the tune up. There are tons of things to keep a motors max rpm down. In terms of the short block though the rod bolts or the oiling system is usually it, barring assembly or other defects.
You know that comercial about the ford truck bed bolts where they talk about how tough they are, well a super exotic race quality rod bolt is like king kong next to a dozen of those working together to support the same load. They are the most highly stressed parts in the system followed by the piston pins, and the rods are shortly behind that. All are supporting very similar loads, but the rod bolts take it all, the other components are much larger and only take a fraction of it.
This assumes you got everything else in the motor perfect including the tune up. There are tons of things to keep a motors max rpm down. In terms of the short block though the rod bolts or the oiling system is usually it, barring assembly or other defects.
06-22-2008, 03:52 PM
#11
Registered User
Join Date: Oct 2007
Location: Denton, Texas
Posts: 374
Usually what defines max safe rpm assuming the oil system is up to part and the valvetrain can take anything. Is the mass of the piston, pin rings and little end of the rod. These factors all go into the stress that the rod bolt deals with.
You know that comercial about the ford truck bed bolts where they talk about how tough they are, well a super exotic race quality rod bolt is like king kong next to a dozen of those working together to support the same load. They are the most highly stressed parts in the system followed by the piston pins, and the rods are shortly behind that. All are supporting very similar loads, but the rod bolts take it all, the other components are much larger and only take a fraction of it.
This assumes you got everything else in the motor perfect including the tune up. There are tons of things to keep a motors max rpm down. In terms of the short block though the rod bolts or the oiling system is usually it, barring assembly or other defects.
You know that comercial about the ford truck bed bolts where they talk about how tough they are, well a super exotic race quality rod bolt is like king kong next to a dozen of those working together to support the same load. They are the most highly stressed parts in the system followed by the piston pins, and the rods are shortly behind that. All are supporting very similar loads, but the rod bolts take it all, the other components are much larger and only take a fraction of it.
This assumes you got everything else in the motor perfect including the tune up. There are tons of things to keep a motors max rpm down. In terms of the short block though the rod bolts or the oiling system is usually it, barring assembly or other defects.
06-22-2008, 05:26 PM
#12
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,648
To me, if someone can't be a bit more explicit in asking a question, and doesn't bother to respond to a request for clarification, its sort of a waste of band width.
Carry on.....
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