Looks good! How did you do that?
When you get everything together and start riding it, look for signs of overheating.If there are any it might be due to your wrinkle paint job.There are flat black paints made for use on BBQ's and wood burning stoves that have almost no insulating qualities so they will work great on cylinder fins. The heat will pass right thru them.The wrinkle paint being used is good up to temperatures of 350*F so it should last on a finned cylinder. That doesn't mean it's a good thing to have on a cylinder though.Just because a paint is called a High Temperature paint does not mean it has low insulating properties. It means high temperatures won't cause the paint layer to break down.The ability to allow heat to pass thru the paint layer is not true with many paints and I suspect a paint that wrinkles may in fact be rather poor at heat transfer.The wrinkles themselves create thicker layers and that can't be good for letting heat pass thru them.I did look at the available information for VHT Wrinkle Plus but it didn't have any data on heat transfer.It did give several areas that can get up into the 200*F temperature range like valve covers but it did not include air cooled engine cylinder fins as a suggested place to apply it.Hopefully it will not cause a problem. It does look good on the fins.
So it's pretty much looks like that the AVL can take a lot of mods from Ace fireball iron barrel ? I knew there were similarities but it's always fun to read your posts
The custom big valves(1.8" intake, 1.57" exhaust) on new seats are installed, porting work done, the mods done for installing the beehive valve spring package, the chamber re-shaping has been done, the head skimmed .010" for flat surface, alloy 32mm manifold is installed and flow-matched to the head,and it is on the flow bench now to get the final flow numbers. Then the coatings go in the chamber and exhaust port.I will probably have the flow numbers early next week. Very slight chance I might get the numbers later tonight if they can finish that today.Ace Air Canister for TM32 is finished and waiting to be shipped with the head.Piston needed no valve reliefs cut in for this. If the lift was increased, then we'd have to do it.
Update:Tooseevee's head is done!I have the flow bench sheet and the bill.I have not picked up the head yet, so I don't have pics. I will take some pics and post them when I pick up the head next week.
Here's the flow test sheet for Tooseevee's head in the attachment below(pdf).They called it the "Big Head" because it looks similar to the old Big Head, and so they started calling it the "new Big Head". So, that's why the file name is like that.The columns labeled "1" for intake and exhaust, are the "before" flow test, and the columns labeled "2" for intake and exhaust, are the "after" flow test.Note how the exhaust port is no longer backing up at lifts over .350", and the port is much more stable.Also note how we now achieve more intake flow at .350" lift, than the OEM port flowed at .600" lift(if it could have ever gotten there!) But if we put our roller rockers in there, it could take advantage of all the increased flow up to 213 cfm @ .600" lift with the same porting that we put in it for this job.In the AVL, the stock rockers are approximately 1.1:1 ratio, so the approximate max lift will be around .330". So, you can ballpark the flow level to be between the .300" and .350" rows on the chart.This job was done to get the power improved in the normal rev-range, and so we estimate probably 6000 peak hp rpm, similar to the Fireball. It will rev above that, though, if he wants to, but it will just hold roughly the same peak power for a hundred rpm over the peak hp rpm, if necessary.There will be a nice increase in the midrange torque, where most people are interested in riding.Now, this is our response to what Tooseevee asked for, and we feel that this is a good package for the "AVL Fireball" type of head work. It fits the same niche as the Iron Barrel Fireball does.However, if people want less or more, or even a lot more for racing or something, we can respond to those needs also. We can put the roller rockers into this head too.So, we can meet almost any request for power upgrades on the AVL now.
Thank you a big bunch, Tom, and thank all the other guys at Mondello's for me. I hope I've maybe helped some other guys with AVLs (the last engine with the true vintage look) to do some mods they might be on the fence about
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