Desktop Dyno request thread
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
The stock cam in a 74 LS4 was about 440/440 with 210/210. Just wanted to see what the Comp HE 260 with 475/475 - 212/212 would do over the GM stock.
I do appreciate it and have a great Christmas!
Stock displacement 1974 LS4 454
118 cc heads...stock 781s
8.25/1 GM flat tops
Stock 750 Qjet
Stock exhaust
CompCams Grind Number: CB 260H-10
I do appreciate it and have a great Christmas!
Stock displacement 1974 LS4 454
118 cc heads...stock 781s
8.25/1 GM flat tops
Stock 750 Qjet
Stock exhaust
CompCams Grind Number: CB 260H-10
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Folks, I think I'm caught up again. Please remember that I have a "day job", so I won't always get to these right away. If you have something really urgent (i.e.,you're doing an immediate build and trying to make some decisions) PM me...but otherwise I'll get to the requests as soon as I can.
Melting Slicks
Joined: Mar 2005
Posts: 2,187
Likes: 7
From: Chetwynd B.C.
No propblem Billa. Most of us have that "Nasty" 
day job anyway. Sure do appreciate your time and effort doing these dynos. I will get the cam card from the builder and then repost later.
shmoky
day job anyway. Sure do appreciate your time and effort doing these dynos. I will get the cam card from the builder and then repost later. shmoky
Drifting
Joined: May 2005
Posts: 1,909
Likes: 6
From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
If my references are right, the LS-4 produced 275HP/390TQ. You're picking up some good power - but IMHO it's far too mild of a cam given the heads. The stock manifolds are hurting as well - if you can't do headers from an originality perspective I would at least consider having the stock manifolds extrude-honed to pick up some power.
Thanks Billla...
... but it's "the wife's car". 
We can't put the local HS art teacher in something too RAD !
Thanks Billla...
... but it's "the wife's car". We can't put the local HS art teacher in something too RAD !
Instructor
Joined: Mar 2005
Posts: 159
Likes: 0
From: American Canyon Ca
Here's my numbers: SBC 383 4.00/3.75, rods-5.7, heads-ProComp 64 cc 190cc intake runners, Intake-2.02, Exhaust-1.60,Pistons-18.6 dished, CR-9.6:1, Carb. Demon 825, Exhaust-Headman headers 1 5/8, Single plane intake manifold, , CompCam xr288Hr, http://www.compcams.com/Technical/Dy...8HR-10_001.asp
Race Director
Joined: Jan 2003
Posts: 15,175
Likes: 86
From: State of Confusion
No-problem at-all.....
I'm sure most everybody in this thread apprecaites the time you have spent on it:
most of this stuff is just 'guessing', but your work may help some of us make INTELLIGENT guesses.
I'm sure most everybody in this thread apprecaites the time you have spent on it:
most of this stuff is just 'guessing', but your work may help some of us make INTELLIGENT guesses.
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
SBC 383 4.00/3.75, rods-5.7
heads-ProComp 64 cc 190cc intake runners, Intake-2.02, Exhaust-1.60
CR-9.6:1
Carb. Demon 825
Exhaust-Headman headers 1 5/8
Single plane intake manifold, , CompCam xr288Hr, http://www.compcams.com/Technical/Dy...8HR-10_001.asp
heads-ProComp 64 cc 190cc intake runners, Intake-2.02, Exhaust-1.60
CR-9.6:1
Carb. Demon 825
Exhaust-Headman headers 1 5/8
Single plane intake manifold, , CompCam xr288Hr, http://www.compcams.com/Technical/Dy...8HR-10_001.asp
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
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Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
). Can you send a pointer to the specific cam card?
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Usually for a custom grind the vendor sends a complete cam card with the cam...but here's the information I need for a valid (within simulation limits) run. Ignore the Lifter acceleration rate as it's calculated from seat (.006) and .050 cam event timing.
Melting Slicks
Joined: Mar 2005
Posts: 2,187
Likes: 7
From: Chetwynd B.C.
Billa, Here is what the camcard had on it.
P/N 11-000-9 S/N M3394-07
CB 3014B/3035B HR 113.0
Gross lift .606/.601
Duration at .006 268/276
.050 valve timing
open 0, 38 close ABDC int
open 49, -5 close ABDC
Cam installed at 109 ICL
218/224 @ .050 duration
.357/.354 lobe lift
113 lobe separation
Hope this is what you need. Looking forward to the results.
shmoky
P/N 11-000-9 S/N M3394-07
CB 3014B/3035B HR 113.0
Gross lift .606/.601
Duration at .006 268/276
.050 valve timing
open 0, 38 close ABDC int
open 49, -5 close ABDC
Cam installed at 109 ICL
218/224 @ .050 duration
.357/.354 lobe lift
113 lobe separation
Hope this is what you need. Looking forward to the results.
shmoky
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
That would be it Usually for a custom grind the vendor sends a complete cam card with the cam...but here's the information I need for a valid (within simulation limits) run. Ignore the Lifter acceleration rate as it's calculated from seat (.006) and .050 cam event timing.
Usually for a custom grind the vendor sends a complete cam card with the cam...but here's the information I need for a valid (within simulation limits) run. Ignore the Lifter acceleration rate as it's calculated from seat (.006) and .050 cam event timing.lift @cam int. .420 exh .420
lift @valve int. .630 exh. .630 (arm ratio 1.5)
cam timing :
@.0205
int. 278° exh. 288°
events : intake : 29° BTDC 69° ABDC
exhaust : 79° BBDC 29° ATDC
@.050
int. 246° exh. 256°
Events : intake : 14° BTDC 52° ABDC
exhaust : 64° BBDC 12° ATDC
max lift : intake 108°ATDC , exhaust 117° BtDC
LCA : 112.5°
Lash is .02 both on intake and exhaust and set when hot.
no advance or retard of the cam.
That's all I have.
Thx
Yves
Burning Brakes
Joined: Oct 2004
Posts: 763
Likes: 0
From: Loveland Colo
Sure, I'll go for it
Billa,
Thanks that is a nice offer. I've often wondered how it might compare to my Mustang dyno results....Here is mine, no rush:
-small block
-355", 4.030" bore X 3.48" stroke, OEM 5.7" rods
-AFR 180 street heads, 2.02 I X 1.6 E valves
http://airflowresearch.com/180sbc_sh.php
-9.75:1 static compression ratio
-750cfm Q-jet, Weiand 8000 manifold
http://www.holley.com/8000.asp
-1 5/8" full length headers into 2 1/2" exhaust with X-pipe & Magnaflows
-CC XE262H (pt # 12-262-4) computer cam, 1.5 full roller rockers
http://www.compcams.com/Technical/Se...umber=12-262-4
Thanks,
John
Thanks that is a nice offer. I've often wondered how it might compare to my Mustang dyno results....Here is mine, no rush:
-small block
-355", 4.030" bore X 3.48" stroke, OEM 5.7" rods
-AFR 180 street heads, 2.02 I X 1.6 E valves
http://airflowresearch.com/180sbc_sh.php
-9.75:1 static compression ratio
-750cfm Q-jet, Weiand 8000 manifold
http://www.holley.com/8000.asp
-1 5/8" full length headers into 2 1/2" exhaust with X-pipe & Magnaflows
-CC XE262H (pt # 12-262-4) computer cam, 1.5 full roller rockers
http://www.compcams.com/Technical/Se...umber=12-262-4
Thanks,
John
Last edited by JPhil; Jan 14, 2008 at 07:26 PM.
Burning Brakes
Joined: Nov 2004
Posts: 1,193
Likes: 176
From: Hillsborough NC
Thanks for the run. I was wondering if I could ask for a second run using a some different tweaks. Would it be possible to tweak my model with the following changes:
1.52:1 roller tip rockers
.015 thickness steel shim head gasket
Installing the cam 4 degrees retarded (to keep DCR in the right range)
Motor is not built yet, so you are being very helpful.
Oh, and one question, did DD allow you to specify the rams horns with the bigger dumps, or did you have to use the standard ones?
Thanks again
-Fred
1.52:1 roller tip rockers
.015 thickness steel shim head gasket
Installing the cam 4 degrees retarded (to keep DCR in the right range)
Motor is not built yet, so you are being very helpful.
Oh, and one question, did DD allow you to specify the rams horns with the bigger dumps, or did you have to use the standard ones?
Thanks again
-Fred
I've revamped and would like to get an updated run if possible. I've changed a few things to get he compression ratio, quench and DCR more usable. Can you re-run my sim with the following changed parameters? Everything else is the same.
Pistons: 13.8cc dish piston
Head Gasket: .015 steel shim gasket, 4.1" bore
That combination lowers my Static CR down to around 9.5:1 and my DCR down to 7.8:1 with a very good quench.
Thanks again
-Fred
Last edited by SLVRSHRK; Dec 24, 2007 at 02:56 PM.
Burning Brakes
Joined: Jul 2006
Posts: 833
Likes: 4
From: Mexico NY
request...
++++++++++Lower END++++++++++++++++
• 355 Cubic Inch sbc
• 4340 Forged Super Light Crank, 43 lbs
• Premium 6.000" I-Beam Rods
• 390 gram SRP Flyweight Pistons
• 7/16" ARP Cap Screw Bolts
• 1/16" x 1/16" x 3/16" Ring gaps
SRP Flat Top Pistons
• Piston #157064 • 3.500 Stroke • 4.030 Bore
Compression Ratio
•58cc •64cc •70cc
•11.2 •10.4 •9.7
Iron eagle heads
+++++++Heads++++++++
64
CNC Machined Combustion Chamber: No
Intake Runner Volume (cc): 215cc
Exhaust Runner Volume (cc): 75cc
CNC Machined Intake Runner: No
CNC Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Spark Plug Style: Angle
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.050 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.620 in.
Outside Diameter of Outer Spring (in): 1.437 in.
++++++++++++++Intake / carb+++++++++++++++++++++
quadrajet tuned by a pro
edelbrock performer 2120 (or whatever one is stock replacement)
_++++++++++++++++cam+++++++++++++++++++
100 % stock cam for l82
(I don;t know if I'm cchangine that)
Thanks dude.
• 355 Cubic Inch sbc
• 4340 Forged Super Light Crank, 43 lbs
• Premium 6.000" I-Beam Rods
• 390 gram SRP Flyweight Pistons
• 7/16" ARP Cap Screw Bolts
• 1/16" x 1/16" x 3/16" Ring gaps
SRP Flat Top Pistons
• Piston #157064 • 3.500 Stroke • 4.030 Bore
Compression Ratio
•58cc •64cc •70cc
•11.2 •10.4 •9.7
Iron eagle heads
+++++++Heads++++++++
64
CNC Machined Combustion Chamber: No
Intake Runner Volume (cc): 215cc
Exhaust Runner Volume (cc): 75cc
CNC Machined Intake Runner: No
CNC Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Spark Plug Style: Angle
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.050 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.620 in.
Outside Diameter of Outer Spring (in): 1.437 in.
++++++++++++++Intake / carb+++++++++++++++++++++
quadrajet tuned by a pro
edelbrock performer 2120 (or whatever one is stock replacement)
_++++++++++++++++cam+++++++++++++++++++
100 % stock cam for l82
(I don;t know if I'm cchangine that)
Thanks dude.
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Guys, I've just been buried at work, school and real life. I'm working to get back in the saddle after the holidays, so just bear with me. I'll get to what I can get to when I can get to it.