I have seen several flatheads mentioned as "244"s, instead of 239's. What makes it a 244?

I ask, because the motor I just bought is a 244. I have seen 244's listed as being bored .020 and .030 over...so it seems like it's not just boring that increases it. Wouldn't that be stroke?

Thanks in advance!

R

 

Interesting question. The guy I bought my chassis from said the engine bored .30 over, I think. I have no idea what the CID is.

 

Probably not the stroke - usually that's referred to in fractions.... 1/8, 1/4 etc.

I did the math a long time ago on my 8BA that's .040 over and I think it came out about 244 or 245. Guys that are playing the cube game to impress others use those numbers, but normally it's just a 239 thats +.040"

edit: see if the math works: v = pi x r squared x height

std bore 3 3/16 = 3.1875" = .040 = 3.2275/2 = radius of 1.61375" x 1.61375 = 2.604

3.14 x 2.604 x 3.75[stroke] x 8[cylinders] = 245.3 cid

numbers rounded a bit......

 

I get 244 on an 8BA that's +.030" over on 3.1875 stock bore, w/stock stroke (used Excel w/ more decimals). Depending on the round off, it could be either .020 or .030. The cubes are insignificant, but there is also a slight bump in compression. Saw someone on the HAMB has a 302? c.i. flatty, 4.25" stroke and +1/8" on bore? Something like that. With a blower no less! That's serious!

 

Thanks, all! I'd never heard of a .030 over (or any over, for that matter) given as cid. Always just .020 over, etc. Learn something new every day.

So my .040 block, that I have sitting, is a 247 or so?? Nah, to me it's just ".040 over".

Thanks again,

R

 

I knew I had seen a chart for this somewhere. Took me a while to find it because I get so easily distracted from what I am really looking for when going to all those flathead sites.

Ford Flathead Specifications

Where do you find a crank with 4 1/8 in stroke?

 

SCAT makes anything you want. Hecho en China.

 

Is there a website for Y-Blocks like this? How do I know the bore of my 239 Y-block. It was rebuilt in 1979 and bored out but I don;t know how much. Can I assume it was bored out .030 over?

 

http://www.ford-y-block.com/displacement.htm

It seems to have been pretty common to go straight to .020" or .030" over "back in the day". There was plenty of meat to go to +.060" on a flatty, probably on a Y-block too. Cost is the same for .010" or .060" (unless you hit air!)

 

On the Flathead anthing 276 and under is considered a nice Street Motor. It will run nice sound nice and get decient gas milage.
When you get into Flatmotors above 176 with some cam thrown in the you have to be prepared for some lowend driving as these motors love to run.
Build a nice little Flatmotor get the BoyScout Badge or build something else,

 

This website will give you lots to think about including the cid link at the top right of the page.

http://www.241computers.com/ford/Con...s20-32-40.html

Here's another from the MSN flathead group.

http://www.btc-bci.com/~billben/flathead.htm

 

Now this is funny, I don't care who you are. I did this last night, I had been up about 20 hrs at that point and the pain was getting bad.

 

I brought this back up to answer my own question. I couldn't figure why 4 1/8" stroke deserved a place in all those flathead displacement charts.

The other day day Dick posted another great link, http://www.wrljet.com/fordv8/ . There I found the answer. "Mercury rod bearings are 2.14" which allows for offset grinding to the stock Ford size of 2", for a free 1/8" stroker."

Seems I learn something old here every day.

 

Yes, but it's a mix of parts. The Merc crank with 2.138" rod journals that can be turned down came in the late series flathead '49-53.
The required con rods to fit the 1.998" turned journals are found in the earlier flatheads '32-42, especially the 99A and 21A con rods (39 merc and 42 ford) and the final project will need the older floating bearings.

 

http://www.vanpeltsales.com/FH_web/f...ifications.htm

Mac had a little chart

Scat has a 4.375" Stroker Crank, 7" Rod Pin sit at 2" I think one uses Buick Bearings.