7875 + 5.9 + E85 + Megasquirt

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50/50 water/meth
I’d ditch the water at your power level. It’s not doing you any good and is taking up space. You will not be able to get enough fuel in the chamber when you’re spraying that much water. It also screws with the number your wideband will show.
 
I’d ditch the water at your power level. It’s not doing you any good and is taking up space. You will not be able to get enough fuel in the chamber when you’re spraying that much water. It also screws with the number your wideband will show.
I can ramp it in and PWM the amount delivered. It doesn’t have to be an all or nothing with the WM. I’m just looking at it as extra insurance when ambient temp is really high and IATs start to climb.
 
I can ramp it in and PWM the amount delivered. It doesn’t have to be an all or nothing with the WM. I’m just looking at it as extra insurance when ambient temp is really high and IATs start to climb.
Yea I know you’ve got all the control in the MS but you’re still putting a non burnable in the chamber. The water definitely evaporates and cools the charge but at some point (you’re there now) you start to fight being able to tune around the water.
 
Falling on its face right out of the hole. I think I had the WM enabled on this run.
 
Tore the front of the engine off to replace a leaking front seal and found some funny stuff. Pin from the timing chain tensioner worked its way forward and wore a hole in the timing chain cover. Discovered the elastometer in my harmonic balancer is worn out also. Might explain how my crank sensor got trashed.
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Nobody makes a nice SFI balancer for these crankshafts so I ordered another one similar to this one.
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Nice catch. That could’ve gotten bad. You going to toss the tensioner in the garbage? :poke: I think PRW and Blueprint engines are both making dampers now for magnums. PRW is sfi rated. Not sure on the blueprint one yet.
 
Nice catch. That could’ve gotten bad. You going to toss the tensioner in the garbage? :poke: I think PRW and Blueprint engines are both making dampers now for magnums. PRW is sfi rated. Not sure on the blueprint one yet.
I ordered the Blueprint one. It’s not SFI rated and looks just like the PRW it’s replacing. I’m sure they’re the same part. The tensioner I’m not touching. It’s still doing its job. Not sure what the purpose of that little pin was.
 

E85 Plug reading thoughts? Fresh Autolite 3922s, gapped 0.028. Same plug I’ve used for several years.

- 3rd gear pull, WOT about 11psi max,
- 22 degrees, 11.00AFR (gas scale).
Killed the engine immediately after the pull. No idle, no cruise.

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Plug looks good. Cut the shell off of one so we can see the fuel ring. E85 is harder to read and you’re spraying meth on that which makes it even more difficult. But I can tell you you’re not too rich. The timing is super safe though. You’re not even starting to put heat in the strap. I’d use a step colder plug
 
Plug looks good. Cut the shell off of one so we can see the fuel ring. E85 is harder to read and you’re spraying meth on that which makes it even more difficult. But I can tell you you’re not too rich. The timing is super safe though. You’re not even starting to put heat in the strap. I’d use a step colder plug
Thanks. I’m staying off the meth for now, lol. Ambient temps are lower now and IATs are generally pretty sane. I hope to make it to the track this Friday. Going to bump the timing a couple degrees and see how it responds.
 
Thanks. I’m staying off the meth for now, lol. Ambient temps are lower now and IATs are generally pretty sane. I hope to make it to the track this Friday. Going to bump the timing a couple degrees and see how it responds.
When you do that use a new plug and compare it to an old one. You don’t need to replace the whole set though. Just one. Maybe you can cut that one open.
 
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