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my Evora GT engine is fubar.. what next!

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521 views 18 replies 13 participants last post by  mikelr  
#1 ·
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Well, this sucks. Over the weekend my car decided to touch 9,000 rpm (not sure how that could have happened…). I’ll be documenting everything here as I go. Right now, I’m in the process of pulling the blower to inspect the forward facing valve cover before pulling the engine.

I’m not entirely sure what direction I’ll take yet. For context, the car was running Komo-tec’s 475 tune, and judging by the plugs, it wasn’t happy during the 3k miles I had it on - lots of detonation marks. Always filled up with Shell 93, and while it never felt that bad while driving, clearly something wasnt 100 percent.


So far, inside the rear-facing rocker cover has no broken pieces. I was expecting to see broken springs, but maybe I’ll find something when I pull the forward cover. Unfortunately, all the cylinder walls are scored. The engine still turns over, but it’ll backfire if you try to start it.

At this point, I don’t really have a set end goal. Maybe I’ll go for a mild rebuild with a ported blower and hope the trans is still healthy or swap something stupid into it... haha


curious to hear what you guys would do in my situation.
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#6 ·
I am still very fresh to the Lotus world and I'm glad to hear we know exactly how it got to 9,000 rpm. As far as the fuel, I will say that the tuner for my last car did not like Shell. He claimed it was prone to pre-detonation. Maybe it was specific to his tunes, maybe there's a connection, it's anecdotal information from me at the end of the day. I used to run Shell in my Focus RS until I switched to Mobil and have run that ever since including in my new to me 2017 Evora 400. About 500 miles under my Lotus belt all with Mobil 93.

Good luck getting to the bottom of everything. Will be tuning in for updates.
 
owns 2017 Lotus Evora 400
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#13 ·
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D
#12 ·
I cannot imagine that a difference in gas brand would cause any discernible engine damage. Hard to comprehend that as a motorcycle racer who has run multiple brands of gas in multiple bikes over decades always running at redline without any evidence to indicate any sort of pattern. I highly doubt that a Mobil or Shell is vertically integrated that far enough back in the supply chain to refine their own crude with any sort of proprietary methods.

I think its safe to assume Bru's engine wear is more because of "4k miles of hard track use" combined with the most obvious modification: Komotec 475.
 
#15 ·
I'd stick with the 2GR. They're barely pushed to half their potential in the Evora. Unfortunate that mistakes happen but it'll come back better than ever. I'd just get a low mileage pull out from a Sienna or Highlander, swap over all the exterior lotus bits, and have at it. The replacement engine should only run you $1500 or so.
 
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