Everyone uses E85 in the tank. Which is in my opinion, only suitable for a track.
In my opinion, E85 should be used on a button when you want it. You don't have nitrous being used between bursts it's the same for E85.
Why is this the case? It's the case because people map in a fuel sensor and blend in the tank. If you could visualise the actual boosted E85 vs the distance travelled using E85 off power it would be obvious to most.
I plan to have a separate tank, second fuel line, and potentially second set of injectors to feed the E85 mix.
Ideally, you'd have it blended in the fuel line, but I'm not sure how I could switch fuels quick enough without using the injectors.
Why has no one tried this? I've no idea. I don't think any other way would work quick enough, as fuel pump operation (on/off switching) isn't quick enough. Whereas two separate fuels recirculating constantly, the other when not in use would work (E85 system off when map not running).
This is obviously a theory, you would either be racing or not racing so no one with any money has ever thought to trial a system or desired it. But for me, I don't want to be pulling over dumping in E85. Nor hitting traffic with a tank full of it, only to have to mix some more. Pain in the a**.
Bignum is right, reliability has been raised a few times with them too. The rods are designed for the cranks, so a built engine can use a stock crank. Stroker setup would mean forever needing the crank.
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A non turbo crank is what he means.