Quote:
Originally Posted by 911 tweaks
no offense to any that contributed to the engineering or build here, but, how long will that "hummer" last before it spins a bearing or breaks a wrist pin or cooks something ? (I hope you say it is a race motor from the dunebuggy reference i.e. live 30 hrs... so I don'tr want to build one and go broke in the process !! :-)
Man that is one wicked, and I mean wicked... attractive set up !!!!!!!!!
Bob
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No offense taken. It's a great question.
The engine is designed to run at relatively low rpm. The first version of the engine made maximum horse power at 6800. It's first life was over 100 hr. The second rebuild lasted about 25 hr. It lost a rod after being run in a inverted position. It seems the customer put his buggy on it's lid.
This engine is designed to make maximum HP at 7200. With these enhanced components and a red line of 7200 I would guess this engine will get a freshen up at 100 hr.
The GT3 engine that shares many of these major components will generally have a service life of 50-75 hr. and that engine spins at 9200+.
The biggest problem we face with this type of application is contamination from sand. It gets in everywhere.