I understand what a Hemi head is, but what is a Wedge head?
I never understood that. ...
Jeff
I never understood that. ...
Jeff
Hemi vs Wedge
- Thread starter MrJLR
- Start date
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Well that just cleared it right on up, now didn't it? Talk about a useless answer.
Here, this will help. Wedge refers to the combustion chamber shape when the piston is at TDC. Because the piston top makes up part of the combustion chamber when it is at TDC, it is part of that shape. See the picture below.
Many makes utilized the wedge shaped combustion chamber. Chrysler used it as a marketing tool. Look at the area above the piston in the picture above. Between the piston top, valve, head and plug you can plainly see the wedge shape that squeezes the air fuel mixture toward the spark plug during compression, making for a more complete burn. Chevys were wedges from 55 all the way into the 2000s and most still are. GM just never used it as a marketing tool. Most automotive marketing names were just that. Marketing. But in this case when you see "340 WEDGE" callouts on a Duster hood for example, although it is marketing, it really meant something too.
old Flat Head Fords were not wedges
sorry... had to....
sorry... had to....
1967 273 Wedge 2 barrel or 4 barrel 920 casting number head 1.78 in intake valves, 1.50 exhaust valves, side by side.
1956 341 Desoto Hemi Head 1.94 intake valve, 1.75 exhaust valve, on center, fully machined combustion chamber.
1956 341 Desoto Hemi Head 1.94 intake valve, 1.75 exhaust valve, on center, fully machined combustion chamber.
diymirage
HP@idle > hondaHP@redline
No, those are more like a sliceold Flat Head Fords were not wedges
sorry... had to....
old Flat Head Fords were not wedges
sorry... had to....
Ummmm......yeah they are. The chamber is just below the spark plug. It is a wedge.
that would be more of a shim than a wedge
that would be more of a shim than a wedge
ok.
lol... I don't know, i'm not a flat 8 expert, just throwing some real, good, useful information …
To fill the big combustion chamber on the Hemi, the pistons needed a massive dome on them. Kim
How about the 348-409 heads?
them there would be potato wedges
The wedge was in the block. Back at tech school we had a wedge shaped adapter so we could bore them.
j par
Well-hung Member
I'm pretty sure Mopar wasn't the first to come out with the hemispheric head, but as stated they sure pushed it for marketing...
remember the "2.6 Hemi" K-car?
j par
Well-hung Member
No, do I have to?
j par
Well-hung Member
Actually I have a customer with a 2. 6 K car convertible what a nightmare. I think it's a Mitsubishi isn't it? I didn't know that it had a hemispherical design...
lol... I don't know, i'm not a flat 8 expert, just throwing some real, good, useful information …
I'm no expert in the least, but even a briggs and stratton flathead is a wedge. You ever had one apart?
a briggs and Stratton? lol... of course I've had 'em apart. when I was 10 I would use a drill and wire brush to give 'em a valve job. worked too. Changed the pulleys on riding lawn mowers I got for free, them was my go carts
a briggs and Stratton? lol... of course I've had 'em apart. when I was 10 I use to use a drill and wire brush to give 'em a valve job. worked too. Changed the pulleys on riding lawn mowers I got for free, them was my go carts
Then you should remember the wedge shaped combustion chamber. A flathead Ford is the same x 8.
tell ya another trick of mine besides the "wire brush on a drill valve job",.. replace the cast iron fly wheel on the riding mower with an aluminum fly wheel from a lawn mower. Yes sir, them 4 hp would act like 7 hp. Rip the snot out of your fingers trying to start it and it would back fire, but I could pull a wheelie so high you thought you were going to flip backwards....
you know, the those old riding mowers that the motor was under your seat. no deck, it was part of the body. no steering wheel, rather handle bars. freebies....
j par
Well-hung Member
How did we go from Hemi vs. Wedge to doing wheelies on lawn mowers??! LOLtell ya another trick of mine besides the "wire brush on a drill valve job",.. replace the cast iron fly wheel on the riding mower with an aluminum fly wheel from a lawn mower. Yes sir, them 4 hp would act like 7 hp. Rip the snot out of your fingers trying to start it and it would back fire, but I could pull a wheelie so high you thought you were going to flip backwards....
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