4.310 bore X 4.500 stroke combos.
#1118396
11/21/11 03:42 PM
11/21/11 03:42 PM
|
Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
Gumbydammit
OP
super stock
|
OP
super stock
Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
|
I have a buddy with a new 4.310 bore KB water block. He is wondering if a 4.500 stroke will cause only make torque down low and run out of steam at the top end of the track. I don't think so.
It is a Hemi with a good set of heads. T&D rockers, LSM cam, yadda yadda, all the good stuff. It is just getting a new rotating assembly.
If you had to put a rotating assy in a 4.310 bore block that was going to go in a 3400# drag car with a glide and up to 300HP of nitrous, which stroke would you go with? I know what I think. . .
I'm Gumby dammit!
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: Gumbydammit]
#1118397
11/21/11 04:05 PM
11/21/11 04:05 PM
|
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
jim sciortino
top fuel
|
top fuel
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
|
Quote:
I have a buddy with a new 4.310 bore KB water block. He is wondering if a 4.500 stroke will cause only make torque down low and run out of steam at the top end of the track. I don't think so.
It is a Hemi with a good set of heads. T&D rockers, LSM cam, yadda yadda, all the good stuff. It is just getting a new rotating assembly.
If you had to put a rotating assy in a 4.310 bore block that was going to go in a 3400# drag car with a glide and up to 300HP of nitrous, which stroke would you go with? I know what I think. . .
It isn't just the heads that dictate how well an engine holds on. The induction (intake/carbs) is CRITICAL.
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: Gumbydammit]
#1118398
11/21/11 04:06 PM
11/21/11 04:06 PM
|
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
|
Build it, it will run great. If it has too much TQ down low and not enough at the top end swap rear gears.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: HotRodDave]
#1118399
11/21/11 04:15 PM
11/21/11 04:15 PM
|
Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
Gumbydammit
OP
super stock
|
OP
super stock
Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
|
YUP, That's what I'm sayin. It has the big port Ray Barton Dominator intake with a good HP dominator. The heads are well - worked older KB heads and the motor made power by accident with a little less stroke. Long story short, with all the engine had going against it, it still ran good. Now, with all the right parts, and proper assembly, it should be an animal! 
I'm Gumby dammit!
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: hemi-itis]
#1118403
01/29/12 11:03 AM
01/29/12 11:03 AM
|
Joined: May 2006
Posts: 253
Smithfield, Rhode Island
Mulehead
enthusiast
|
enthusiast
Joined: May 2006
Posts: 253
Smithfield, Rhode Island
|
With a small bore and lone stork with a blower on top will work well.This motor n/a I think will run out of air.I;m thinking of going back to 4.310x4.375 that made hp to and proven motor ( old motor )Now having hard time getting Callies magnum 4.375.Your thoughts ??
Ain't nuthin like a HEMI !
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: Mulehead]
#1118404
01/29/12 11:46 AM
01/29/12 11:46 AM
|
Joined: Nov 2004
Posts: 3,619
Norwich CT USA
Defbob
master
|
master
Joined: Nov 2004
Posts: 3,619
Norwich CT USA
|
Food for thought.... The combustion chamber of a OEM Hemi head has a diameter of 4.310. Sounds like a good match to me. Its not an Oldsmobile, so its not limited to only making torque  With ported heads and a proper cam, you can make that a motor build power to at least 6500-7000rpm. A lot of N/A and Nitrous Promod motors are under-square.
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: Gumbydammit]
#1118406
01/29/12 12:16 PM
01/29/12 12:16 PM
|
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann
super stock
|
super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
|
I agree with Hemi-itis, but personally would do a turbo with EFI. I would not do the nitrous routine again, too tough to manage and hard on parts.
8.30's @3400 lbs
|
|
|
Re: 4.310 bore X 4.500 stroke combos.
[Re: hemi-itis]
#1118407
01/29/12 01:44 PM
01/29/12 01:44 PM
|
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
|
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
When I first built my currant hemi for the 1st time about 11 years ago,I already had a 4.5 stroke Bryant crank.The builder {RIP Lou Vignogna} wanted me to go right to a 4.5 bore to be "square".I insisted on a smaller bore of 4.310 so I would have room for NEXT TIME I'm on the 3rd next time and now reside at 4.391.This time I got a set of SV1's and sold them little 750's that kept me at 4/5 lbs of boost and 10.ohs and a 9.93 best on pump gas.By the way,my junk is 3850 with me & a full tank of gas.Got on the engine dyno last month and pump gas,28* timing and 4 lbs of boost netted 740 HP.On race gas & 10 lbs pushed it to over 900 hp with 850 ft lbs of torque @ 4900 RPM.Not too shabby considering I could not use my carbs or headers 
isn't boost great???
|
|
|
|
|
Bore size is simply not as critical as a head flow limitation on a Hemi, mainly because the valve motions angle toward the bore centers as they open, alleiviating much of the shouding that becomes an issue with a Wedge configuraion. On a wedge the valve action is straight and parallel to eachother, which means the edge of the valve stays at a fixed distance from the bore, with a hemi, the more you lift the valve the further away it moves away from the bore and closer to the center of the hole.
