Dumbo The Flying Elephant

[Larry Hill]

Tomorrow I will be playing with alcohol. I will check all the runners and chamber volumes for correct cc. Now is the time to get it right. That way in tear down I can be fearless because it will comply with the rules. Everyone knows that almost right is still wrong. Not to be confused with "The Daily Ledger".

[Dyno]

Larry, where can we get a good set of headers? Picked up 23 HP today and never fired the car up yet! What you going to use for spark plugs?

[Larry Hill]

I have that info in shop, I will text to you. I have set of Kooks SS and MR2 headers, I will keep the best one and sell the other one.

I know the feeling 392 @ 400 from MoPar, NHRA adjustment before first run 392 / 400 now 392 @ 430

Is it an over kill to have Kirke racing seats with a "Rich Corinthian Leather" seat cover? Just asking!

[Kirk Morgan]

Not if you are Ricardo Montalban.

[Larry Hill]

Pored alcohol all day and only lost 1/2 a qt. The heads are legal right out of the box. The runners are good and the chamber is big 5 to 6 cc. I will run it that way and then recheck before we make an adjustment.

Does anyone how much to cut to reduce chamber size by 1 cc?

Thanks

[pmrphil]

Normally, .006 per cc is fairly close.

[Dwight Southerland]

Larry -
If you are going to make a flat cut on the head to reduce combustion chamber size, here is an easy way to know exactly how much to cut. Put the head on a stand with the combustion chamber facing up. Shim or adjust the head so the head surface is level in all directions using a level. Then, pour the combustion chamber with the amount specified for minimum volume. Use a dial indicator on a bridge to measure the distance to the surface of the fluid from the head surface. Do that for all cylinders and adjust the numbers to determine how much to cut.
This method will work on any head regardless of combustion chamber shape or size.

[Mike Gray]

Originally Posted by Larry Hill

Pored alcohol all day and only lost 1/2 a qt. The heads are legal right out of the box. The runners are good and the chamber is big 5 to 6 cc. I will run it that way and then recheck before we make an adjustment.

Does anyone how much to cut to reduce chamber size by 1 cc?

Thanks

Hopefully it wasn't the good stuff and by losing 1/2qt do you mean spilling it or drinking it?

[Larry Hill]

I spilled it, but I did buy a small funnel that fits the burette.

Yesterday was recording day in the "Dumbo" engine book. The engine I got came in several boxes, for me its the only way to get one. Most boxes have the brand name and part numbers. This make replacement parts hunting easier. Other parts are in plane white or brown wrappers without part numbers. Such was case with the spring seats for the head. Exhaust and intake have different seats, valves are not the same length. So I make a drawing of each in case I can't find a vendor. If push comes to shove I will be able to find some in some bar stock.

Since I had the heads out I would see how well the seats fit. They almost fit but would not set flat against the head. The problem was the OD of the chamfer was not large enough to have clearance over the radius on the head. Solution cut chamfer 1/64 bigger than the chamfer on the guide boss. I was surprised as to how soft and easy the spring seats machined.

I wonder how much unwanted aluminum the seats would have shaved of heads and put in the oil?