Re: HEMI Quench?
[Re: Big Squeeze]
#815903
09/27/10 07:12 PM
09/27/10 07:12 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
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I Live Here
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Posts: 12,424
Kalispell Mt.
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The hemi valve angles are what makes them so great NA, that is not a down fall at all. If any NA down fall it it the heavy pistons required with high compression ratios. The ports may be a hair big for a NA 426 but throw a few more cubes in it and they are not too big at all. With a maximum effort port job and 550 or so cubes you can make close to 1000 hp with the stock castings so they are no slouch! Try that with a 906 or even a factory Max wedge casting.
BTW how small can you mill the hemi chambers down to any how?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: HEMI Quench?
[Re: HotRodDave]
#815905
09/27/10 08:27 PM
09/27/10 08:27 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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The valve angle, piston weight, rod lenth, port volume and number of carbs contribute nothing in lack of peoformance ability as does the combustion chamber shape.
the down side of the Hemi in N/A use is directly related to the design of it's combustion chamber. It cannot burn all of the area including that around the sides of the piston dome as quickly as a wedge chamber. The rate of burn is much slower regardless of the compression. There's no way it can burn all that area and make the same power as a B1 55cc chamber. That is until you add some boost. Then it all turs around 180 degrees
home of the Sox and Martin Hemi Duster
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Re: HEMI Quench?
[Re: HPMike]
#815907
09/27/10 09:26 PM
09/27/10 09:26 PM
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Joined: Nov 2003
Posts: 3,060 Western New York
sixpackbee
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Another inherant problem with the chamber is a horrible surface to volume ratio. Lots of area for heat loss.
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Re: HEMI Quench?
[Re: WO23Coronet]
#815909
09/27/10 09:54 PM
09/27/10 09:54 PM
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Joined: May 2005
Posts: 6,446 NJ-USA
HPMike
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Quote:
So what's it's advantage with forced induction? Do all of the advantages seriously outweigh the disadvantages when boost is added? In my original post I mentioned the Boss 429, why does no one make a HEMI head with a chamber like that (and like the Gen III Hemis)? Sure would cut down on piston weight and make a more efficient chamber.
Actually the "ball stud" was nothing more than a way to copy the Chevy big block design.
MB
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Re: HEMI Quench?
[Re: Cab_Burge]
#815912
09/27/10 10:55 PM
09/27/10 10:55 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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with all very large bore and stroke HEMI'S I own there's not much that translates from what an SS Hemi pistion is shaped like.By using a 4.5" bore and stroke 4.5" or 4 3/4". everything we spoke about changes considerably. nor have anything I would consider trick in the SS world.
However I did pull these from a trash can when after INDY when a Barton motor came apart in an SS car. what strikes me here is the out of the box appearance and far from what I expeceted to see from one of their motors.Later I learned this was not one of their "A" combos and no likely to have the trick stuff.
home of the Sox and Martin Hemi Duster
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Re: HEMI Quench?
[Re: HEMIFRED]
#815913
09/27/10 10:58 PM
09/27/10 10:58 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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2
I expected to see a piston much more shaped to follow the chamber shape and valve reliefs hand fitted . then again I haven't been inide a 426 size motor in some time
home of the Sox and Martin Hemi Duster
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Re: HEMI Quench?
[Re: HEMIFRED]
#815914
09/27/10 11:02 PM
09/27/10 11:02 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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this is a D-5 sideby side with stock. look at differences ring pac location wristpin and dome shape
Last edited by HEMIFRED; 09/27/10 11:05 PM.
home of the Sox and Martin Hemi Duster
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