Fat Arnie
New Member
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Benny. its not guaranteed they will break if you have the odd venture yonder. If more frequent its just a matter of time. F=MA tells you that as you accelerate the reciprocating parts of an engine to higher speeds, the loads increase exponentially.
In practice this means the load on your engine internals at 9krpm are roughly double what they are at 8krpm.
A bit of research reveals the internals of the 4.2 V8 are no more exotic than say those in a 4 cyl Duratec from a Mondeo. Whilst it is an F136 derivative, it is no Ferrari engine.
But one thing worth noting Benny. I've built and rebuilt lots of proper race spec engines and thing is clear from my exploits - excessive RPM without the right bits kills engines. The F430 version of the F136 has h crank costing 4x that of a 4200. Because its forged to cope with 9krpm on a regular basis.. You can bet many other parts - rods, pistons, bearings, tappets, springs, retainers are all specially engineered from exotic materials to cope with the extra 1000rpm. If somone has removed the limiter function from your engine, its grossly irresponsible and it will end in tears. I would have it reinstated. If they cannot write it back into the map 300-400rpm higher than stock, then they certainly can't get more power from your engine on a properly mapped basis.
In practice this means the load on your engine internals at 9krpm are roughly double what they are at 8krpm.
A bit of research reveals the internals of the 4.2 V8 are no more exotic than say those in a 4 cyl Duratec from a Mondeo. Whilst it is an F136 derivative, it is no Ferrari engine.
But one thing worth noting Benny. I've built and rebuilt lots of proper race spec engines and thing is clear from my exploits - excessive RPM without the right bits kills engines. The F430 version of the F136 has h crank costing 4x that of a 4200. Because its forged to cope with 9krpm on a regular basis.. You can bet many other parts - rods, pistons, bearings, tappets, springs, retainers are all specially engineered from exotic materials to cope with the extra 1000rpm. If somone has removed the limiter function from your engine, its grossly irresponsible and it will end in tears. I would have it reinstated. If they cannot write it back into the map 300-400rpm higher than stock, then they certainly can't get more power from your engine on a properly mapped basis.
