E85 fuel with carbies

[brook308]

Let me know if you need an intercooler-same one you looked at ages ago--(and not flood damaged)Great thread this as i know nothing about any of it-interesting plus-keep up the good work fellas

Cheers 17fitty, I've been trying to avoid installing an intercooler but if I split another liner then i don't have many options other than ditching the poor old Nord and going v6.
Reilly just shakes his head and tells me to install a SR20det with an Alfa tapet cover.
Recon I'll get banned from the ital challenge?  😄

[brook308]

Well I can report the e85 experiment did not go well.
With jets the size of drinking straws the 40mm carbs could not deliver enough fuel when under load and boost. Fuel leaned out to 17:1 and the engine started to miss fire.
So after one lap of the local track it was back to bp98.
I think the limit is the channels in the carby from the main Jet to the Venturi.
More internal work would need to be done to get enough fuel into the engine.

[LaStregaNera]

Might be limited by the float valve.
If you're comitted, you can "constant flow" a carby - bin the float and needle valve, and drill the body for suction lines at the height you want the fuel at - you need a second pump and a return line to do this though.

[brook308]

Might be limited by the float valve.
If you're comitted, you can "constant flow" a carby - bin the float and needle valve, and drill the body for suction lines at the height you want the fuel at - you need a second pump and a return line to do this though.

Yes you may be right, the neadle and seat were bigger for turbo charging but maybe not big enough.
The fellow pitting next to me during practice ran e85 in a Kawasaki motor bike engine, on carbies that powered an Aussie car type chassis. He said they used e85 to get a bit of an edge on their competition. He also said the e85 caused havock in the carbies and had to be flushed out after every race. Gunge would form in the carby and the needle and seat would get stuck shut.

[Duk]

How about returning to 98 and running direct port water injection?

[brook308]

How about returning to 98 and running direct port water injection?

Yes have returned to Bp98, backed off the max timing by 2 degrees, installed a cold air intake and dropped boost from 12 to 9 psi.
Have been running an AEM water methanol single port injection system plumbed at the turbo outlet.

For the 1st time the car lasted 6 x 6 lap races at our local track. So am happy with the reliability. My clutch can't take more than 9 psi so until I upgrade my clutch I'm happy with the power it has.

[Duk]

When do you plan to fit a decent intercooler?

[brook308]

When do you plan to fit a decent intercooler?

Probably after I split another liner 😀
Getting quite proficient at changing them now.

[Storm_X]

I'm surprised you haven't installed an intercooler, I would consider one pretty much essential for a turbocharged circuit car - even more so considering you're current concerns with detonation.
Those $150 generic ebay intercoolers are surprisingly effective, and a million times better than no intercooler at all.

If you ever want to look into ditching the carbs and distributor, PM me. You might be surprised just how little a decent EFI setup can cost

What woukd you charge for a efi setup?

[jorritkooistra]

I was running normal 98 on my supercharged 33. No knocking issues. Boost hits over 1 bar. Also on blowtrough carbies. But kn e85 you might get a bit more power out of it.

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