More heat reflected into the combustion space and less thermal expansion of the chamber so static compression stays more constant. It should also help vaporize the E85 more readily. Larger temp differential between the cold fuel and hot cylinder should mean faster vaporization.....intake valve and runner coated there is less heat put into the intake charge which lowers detonation risk and flows more air...exhaust valve less chance of it getting too hot...exhaust runners there is less heat put into the coolant..and a hotter exhaust gas flows better/faster

 

So wouldnt decreasing the heat transfer out of the chamber mean the mixture in the chamber is hotter, and therefor more likely to have pre-ignition and detonation?

 

More prone with regular pump gas than fuels with lower RVPs like C16,C85, etc. E85 with its larger volume and relatively low RVP will like the hotter space. Alcohol is pre-ignition prone but not detonation prone. Cold plugs and short ground straps along with the smooth surfaces help eliminate the pre-ignition points. The latent heat of vaporization that the alcohol brings with it will suck all of that heat energy out which keeps pre-ignition at bay. Alcohol also burns cooler so the added heat from retaining it with the coatings will help make more power.

 

I'm anxious to see if it actually works out like that. It'll be running next weekend, right?

 

Not anytime soon with waiting on FedEx still and finding out that the lower manifold doesn’t fit yesterday. That and I’ve lost some motivation.

 

Get a thick gasket and tighten her down, itll be fine

I know the feeling about motivation, story of my truck

 

The bolt holes don’t even line up haha

 

Polishing rocker arm cups and pushrod ends

 

 

I checked them before I lapped them and they sealed water on their own without any springs or grease. I still hand lapped each one with 1200 grit compound and labeled them for their spots. I also CC’d each one again. There was no noticeable difference in volume. (Maybe .1 cc which is less than a drop of water.) The nice thing is that the coating smoothed all the surfaces and transitions. I also like the fact that the shared wall between the intake and exhaust is protected now. Imagine how much heat that shared wall puts into the intake charge. Anywho slowly plugging along.