Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 06-26-2014, 07:29 AM   #201
JWL
Senior Member
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 1,869
Default Re: Boring a flathead

No, Ron, I have not seen the gator in my pond this year. Hope he moved. I think he did a good job on the snakes because I have seen only one in the pond.

Now, let's get back to the reason the valve locations are different from bank to bank-----do you understand my explanation?
JWL is offline   Reply With Quote
Old 06-26-2014, 08:31 AM   #202
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,646
Default Re: Boring a flathead

Yes, but I never understand why they did it. I do understand why they offset the crank and wondered why modern engines don't do that. Are off set pistons still popular? When I built my Hemi, reversing the pistons was one of the first things I did. The engine was stock except for a Crane 292H cam and would turn 6500 with dual quads. scary mother. Back to the flathead, the ports are different side to side as well. Thanks
Ol' Ron is online now   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 06-26-2014, 10:24 AM   #203
Bruce Lancaster
Senior Member
 
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
Default Re: Boring a flathead

On the offset...I have an ancient Ford produced engineering text with an explanation from the horse's mouth...the book is moderately common, and likely your local library could get a copy via interlibrary loan. I just replaced my copy because Flatdog had the old one and was reading it about the time of his death. Did not want to bug the family at such a time!
Anyway, the offset crank is referred to as the "Desaxe principle", which might help in hunting patents or early papers.
I can understand about 50% of the book until it moves into heavy math, it would be a much better read for someone like JWL!
Some excerpts: "...the axis of the cylinder is offset from the centre line of the crankshaft...The principle object of this offset is to diminish the obliquity of the connecting rod during the power stroke. so that the mean thrust of the piston on the cylinder walls during this stroke when the bearing loads are greatest, is reduced."
This moves on into the differences between upward and downward movement vs pin position, influence on real stroke, etc., moving into math that takes me into screaming nightmares of analytical algebra and geometry in the 10th grade.
It also gets into determination and definition of TDC in these things, really explaining why it is not nearly as simple as a dial indicator topping out...
For those who read such stuff:

"An Elementary Text Book of Automobile Engineering", 1935, Facilities department, Ford Motor Company Limited, Dagenham/Essex.
Note that the A&B Fords and the little four banger made in England all also were offset.
Bruce Lancaster is offline   Reply With Quote
Old 12-29-2014, 11:15 PM   #204
31pickemup
Senior Member
 
31pickemup's Avatar
 
Join Date: Sep 2010
Posts: 410
Default Re: Boring a flathead

I just pulled my flathead and it ended up being a 1941-42 that has a 3 3/16 bore but it's not a mercury. Is there still life in her? How much can you go on that year a motor and be safe?
31pickemup is offline   Reply With Quote
Old 12-30-2014, 06:11 AM   #205
scooder
Senior Member
 
Join Date: Jul 2010
Posts: 2,573
Default Re: Boring a flathead

Quote:
Originally Posted by 31pickemup View Post
I just pulled my flathead and it ended up being a 1941-42 that has a 3 3/16 bore but it's not a mercury. Is there still life in her? How much can you go on that year a motor and be safe?
If I recall correctly they will generaly go 0.060" over 3 3/16". I think Walt has taken some of these out to 3 5/16".
Just to clarify, were talking 21A here, no round water hole in the middle?
I'd have thought, if you bore just enough necessary for a good bore, you should be fine. Have you measured to see whats needed?
Martin.
scooder is offline   Reply With Quote
Old 12-30-2014, 09:17 AM   #206
Walt Dupont--Me.
Senior Member
 
Walt Dupont--Me.'s Avatar
 
Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
Default Re: Boring a flathead

Quote:
Originally Posted by scooder View Post
If I recall correctly they will generaly go 0.060" over 3 3/16". I think Walt has taken some of these out to 3 5/16".
Just to clarify, were talking 21A here, no round water hole in the middle?
I'd have thought, if you bore just enough necessary for a good bore, you should be fine. Have you measured to see whats needed?
Martin.
Those 40-42 221 engines with the tin can .040 wall sleeves, I remove the sleeves so now you have an ,080 over bore, I bore them another .045 to 3-3/16 and use std. 8BA pistons. I wouldn't go to 3-5/16 that's 1/4.in oversize. BUT, if I had one that was already 3-3/16 and needs a little clean up I'd probably go another .030 or might get brave and go .040 Walt
Walt Dupont--Me. is offline   Reply With Quote
Old 12-30-2014, 03:08 PM   #207
scooder
Senior Member
 
Join Date: Jul 2010
Posts: 2,573
Default Re: Boring a flathead

Thank you for clarification Walt, I obviously didn't recall correctly. Early stage CRS.
Sorry for wonky info.
scooder is offline   Reply With Quote
Old 12-30-2014, 04:49 PM   #208
31pickemup
Senior Member
 
31pickemup's Avatar
 
Join Date: Sep 2010
Posts: 410
Default Re: Boring a flathead

Yeah there is practically zero ridge but for some reason they look like crap. They're smooth just look bad. Hard to explain. I'm hoping just a hone will do them justice
Attached Images
File Type: jpg unnamed (18).jpg (52.3 KB, 127 views)
File Type: jpg unnamed (16).jpg (49.0 KB, 127 views)
31pickemup is offline   Reply With Quote
Old 12-30-2014, 08:41 PM   #209
36tudordeluxe
Senior Member
 
36tudordeluxe's Avatar
 
Join Date: Feb 2012
Location: Las Vegas, NV
Posts: 1,250
Default Re: Boring a flathead

This has to be the most informative piece I've ever seen here by the "Masters" of the Ford flathead. Much of it beyond my level of comprehension, but never the less, spell binding in its content. I have a 276 that I thought was the "cats meow" but now realize I haven't even scratched the surface in what is possible.
36tudordeluxe is offline   Reply With Quote
Old 12-30-2014, 10:40 PM   #210
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,646
Default Re: Boring a flathead

The 276 is a very nice engine and properly tuned can be a great performer, with excellent fuel economy. So don't sell them short, I have one in my truck.
Ol' Ron is online now   Reply With Quote
Old 12-31-2014, 01:24 AM   #211
36tudordeluxe
Senior Member
 
36tudordeluxe's Avatar
 
Join Date: Feb 2012
Location: Las Vegas, NV
Posts: 1,250
Default Re: Boring a flathead

Quote:
Originally Posted by Ol' Ron View Post
The 276 is a very nice engine and properly tuned can be a great performer, with excellent fuel economy. So don't sell them short, I have one in my truck.
Ol'Ron, am very pleased with the way it now runs, thanks to (Richard in Florida) and your help while I was putting it together.
Attached Images
File Type: jpg 276 left.jpg (319.3 KB, 96 views)
36tudordeluxe is offline   Reply With Quote
Old 12-31-2014, 05:53 AM   #212
scooder
Senior Member
 
Join Date: Jul 2010
Posts: 2,573
Default Re: Boring a flathead

Quote:
Originally Posted by 31pickemup View Post
Yeah there is practically zero ridge but for some reason they look like crap. They're smooth just look bad. Hard to explain. I'm hoping just a hone will do them justice
You got a bore gauge? Or something to measure the bore down in the hole?
Its entirely possible that even with a tiny ridge at the top, the bore can bellow out further down the bore. These measurements will tell you if you'll get away with a hone.
Measure the ring groove clearance, tween the top or bottom of the ring to the groove. This will tell you if you need pistons.
All this depends on how far you want to go, and what sort of engine your after.
Martin.
scooder is offline   Reply With Quote
Old 12-31-2014, 11:19 AM   #213
joe plumber
Senior Member
 
Join Date: May 2010
Posts: 817
Default Re: Boring a flathead

I bored one out of a 34 Ford when I was in auto mechanics class in high school ,1964.I was 17 years old .
joe plumber is offline   Reply With Quote
Old 07-27-2015, 09:13 PM   #214
cmbrucew
Senior Member
 
cmbrucew's Avatar
 
Join Date: Dec 2010
Location: North of sandy ago, CA.
Posts: 1,712
Default Re: Boring a flathead

Bump
__________________
Works good
Lasts long time
cmbrucew is offline   Reply With Quote
Old 09-02-2017, 10:34 AM   #215
youngrodder1929
Junior Member
 
youngrodder1929's Avatar
 
Join Date: Jun 2010
Location: vancouver
Posts: 22
Default Re: Boring a flathead

This is my my flathead runs 85% fuel, theres a couple in the younger generation that love a gnarly flathead
Attached Images
File Type: jpg IMG_20170722_202049.jpg (64.3 KB, 93 views)
youngrodder1929 is offline   Reply With Quote
Old 09-02-2017, 03:42 PM   #216
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 9,112
Default Re: Boring a flathead

Does this have anything to do with boring an engine out? This is a fairly old thread. It looks like it hasn't been run yet unless that's an old photo. Running 4 carbs makes for an interesting generator/fan installation.
rotorwrench is offline   Reply With Quote
Old 09-02-2017, 05:04 PM   #217
Brian
Senior Member
 
Brian's Avatar
 
Join Date: May 2010
Location: New Zealand
Posts: 2,214
Default Re: Boring a flathead

Umm, I don't think he needs a generator or a fan...even water pumps for that matter!
__________________
Unfortunately, two half wits don't make a whole wit!
Brian is offline   Reply With Quote
Old 09-02-2017, 05:58 PM   #218
robert dick
Senior Member
 
Join Date: Sep 2010
Location: massachusetts
Posts: 317
Default Re: Boring a flathead

Always wonder if i ran Walt up at Sanford , i was in B gas with my 33
robert dick is offline   Reply With Quote
Old 09-02-2017, 10:00 PM   #219
Lawson Cox
Senior Member
 
Lawson Cox's Avatar
 
Join Date: May 2010
Location: Above the gnat line in Georgia
Posts: 5,042
Talking Re: Boring a flathead

Quote:
Originally Posted by Ol' Ron View Post
Boring a Flathead depends on your age. 55 and under .060, fore 55 .125, over 7o .182. and if your like Rumble seat, who is older than dirt. .250. And it still runs cool, nice torque motor .

I'm never been bored in a flathead !!
__________________
Life is like a roll of toilet paper. The closer to the end, the faster it goes.

It is better to be seen, than viewed.


"We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm".
Lawson Cox is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 10:17 AM.