Anyone with a desktop dyno
Thread Starter
Intermediate
Joined: Aug 2001
Posts: 41
Likes: 0
Anyone with a desktop dyno
I'm consdiering two options:
1. sbc 331, 4.030 x 3.25, 10:1 CR, comp cam XE268 (224/230@.050,.509/.512 w/1.6 rocker,110 lsa), factory 2.02/1.60 cast iron heads w/64cc, factory '64 alum dual plane intake, speed demon 650cfm vac sec, 1 5/8" headers.
2. sbc 383, 4.030 x 3.75, everything else the same.
If possible, can you post the torque and horsepower numbers for both these setups.
Thank you
Bun
1. sbc 331, 4.030 x 3.25, 10:1 CR, comp cam XE268 (224/230@.050,.509/.512 w/1.6 rocker,110 lsa), factory 2.02/1.60 cast iron heads w/64cc, factory '64 alum dual plane intake, speed demon 650cfm vac sec, 1 5/8" headers.
2. sbc 383, 4.030 x 3.75, everything else the same.
If possible, can you post the torque and horsepower numbers for both these setups.
Thank you
Bun
Le Mans Master
Joined: Oct 2001
Posts: 5,302
Likes: 2
From: Atlanta GA
Re: Anyone with a desktop dyno (bungoo2u)
331, stock heads, 2.02/1.60, 10.0:1 CR, 650 induction flow @ 1.50 inHg, Dual plane intake, small tube headers w/ mufflers, .509in/.512ex lift, 224in/230ex dur all @ .050, fudged on the intake centerline @ 110:
310 HP @ 6500
352 lb/ft @ 4500
If you add JUST pocket porting to this setup:
383 hp @ 6500
372 lb/ft @ 5000
383, same setup as above, stock heads:
332 hp @ 5000
389 lb/ft @ 4000
383 w/ pocket porting:
394 hp @ 5500
412 lb/ft @ 4000
Hope this helps!! :cheers:
P.S. When I went to comp cams website and searched for your cam, the only 2 grinds that came up w/ this exact in/ex dur was for a SB Ford and a Holden. These were XE268H-10 and XE268H, respectively.
Oh, poopie. I didn't see your 1.6 RR at first. What is the eqution for calculating new lift w/ 1.6??? :smash:
[Modified by dtorc4, 7:40 PM 12/31/2001]
310 HP @ 6500
352 lb/ft @ 4500
If you add JUST pocket porting to this setup:
383 hp @ 6500
372 lb/ft @ 5000
383, same setup as above, stock heads:
332 hp @ 5000
389 lb/ft @ 4000
383 w/ pocket porting:
394 hp @ 5500
412 lb/ft @ 4000
Hope this helps!! :cheers:
P.S. When I went to comp cams website and searched for your cam, the only 2 grinds that came up w/ this exact in/ex dur was for a SB Ford and a Holden. These were XE268H-10 and XE268H, respectively.
Oh, poopie. I didn't see your 1.6 RR at first. What is the eqution for calculating new lift w/ 1.6??? :smash:
[Modified by dtorc4, 7:40 PM 12/31/2001]
Thread Starter
Intermediate
Joined: Aug 2001
Posts: 41
Likes: 0
Re: Anyone with a desktop dyno (dtorc4)
Thanks dtorc4,
I did'nt realize just by pocket porting the chambers would yield that much horsepower. To figure out your lift with 1.6 rockers is as follows. Camshaft lift times rocker ratio or if you know lift with 1.5 ratio, divide lift by 1.5, then times 1.6. I hope this helps.
I did'nt realize just by pocket porting the chambers would yield that much horsepower. To figure out your lift with 1.6 rockers is as follows. Camshaft lift times rocker ratio or if you know lift with 1.5 ratio, divide lift by 1.5, then times 1.6. I hope this helps.
Drifting
Joined: Sep 2000
Posts: 1,355
Likes: 0
From: Germantown Maryland
Re: Anyone with a desktop dyno (bungoo2u)
Desktop Dyno overrates pocket porting. It won't yield those increases. I would suggest you consider going to the XE274H cam instead. with the 1.6RR s it will work great. Little lope nevers hurts. :flag
