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Rod bolt failures such as this are cause by metal fatigue.
This fatigue is induced by one or more over rpm incidents during the engine’s life.
The easiest & most common cause is an over rev on the down shift.
It’s induced by down gearing too soon & the over rev is pushed beyond the limiter by the speed & gearing of the vehicle.
It’s not something any driver strives achieves but it is the single most common cause of rod bolt failure in circuit engines.
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when i spoke to one of the teams racing a dc2R in the GT production category, they had the same thing happen to their engine. after lasting more than 2 full racing seasons which is amazing for a stock engine and shows the durability of the B18C, the driver (a.shepherd) over-revved it on a downchange (rev-limmiter cannot prevent this) which caused exactly the same thing..
"What's the point of racing a car that doesn't look cool?" - Nakai-san, RWB
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