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11-25-2002, 08:53 PM
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#1 |
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Goodbye Darlin'
Join Date: Nov 2001
Location: Coupeville, WA USA
Posts: 330
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Desktop Dyno help...
I know this is an engine/drivetrain question but only one response over there (thanks messed up c-10).
Could someone with Desktop Dyno crunch these numbers for me? It's not fast but there is torque a-plenty! Misc: 400 SB .060 over (413ci) Headers (1.5in diam.) Flowmaster mufflers (40 series?) TPI Heads (#3998993): Flow 150.8 int/ 91.1 exh Diam. 2.02 int/ 1.60 exh 75cc chamber Induction: 52mm Throttlebody flows 790CFM Cam (Comp Cams HE268): Dur. @ .050 218 (268 advertised lift) Lift .454 1.52 lift roller rockers Pistons: dished .060 over (4.185 bore) C/R 8.5:1 (?) Am I missing anything?.. Thanks!
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1971 Blazer CST SOLD! |
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11-25-2002, 09:04 PM
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#2 |
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Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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I used 882 heads with 8.5-1 C/R..260hp @4000 and 400ftlbs of torque @2500 rpm..the C/R is way low for power and the tpi is to small....
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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11-25-2002, 09:45 PM
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#3 |
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Goodbye Darlin'
Join Date: Nov 2001
Location: Coupeville, WA USA
Posts: 330
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Thanks, did the program give ideal numbers for the TPI and C/R?
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1971 Blazer CST SOLD! |
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11-25-2002, 09:51 PM
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#4 |
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Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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no it doesent have that function..but the 400 I had on file had 10-1 CR and a 900 cfm tpi..and the hp was around 375 and torque at 440......
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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11-26-2002, 08:52 PM
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#5 |
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Goodbye Darlin'
Join Date: Nov 2001
Location: Coupeville, WA USA
Posts: 330
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Thanks for the help, with compression at 10:1 I would need to run higher octane gas... I wonder if bumping the C/R up to 9 or even 9.5:1 would make much difference and still allow me to use the lower test gas? Anyway it's good to have a general idea of the throttle body this engine can handle...
Looks like a Desktop Dyno purchase is in my near future 
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1971 Blazer CST SOLD! Last edited by 71Blazer; 11-26-2002 at 08:58 PM. |
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11-27-2002, 12:43 AM
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#6 |
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Registered User
Join Date: Dec 2001
Location: Spring Creek, nevada. U.S.A.
Posts: 456
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where is coupeville?
in relationship to larger towns.
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69 chevy short wide box project 70 GMC jimmy project |
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11-27-2002, 05:23 AM
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#7 |
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14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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Just for a compression ratio comparison...my current setup with Vortec heads and an original flat-top bottomend gives me 10:1 compression or so (possibly as high as 10.2:1). DD2K says it's good for about 250hp/250 lb/ft. Dropping it to 9.0:1 makes it 235/238 at the same RPMs.
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