CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s - Page 2 - Yellow Bullet Forums
;

Go Back   Yellow Bullet Forums > Technical Section > Naturally Aspirated - Uratchko Racing Engines

Reply
 
Thread Tools Display Modes
Old 11-11-2019, 02:57 PM   #16
G-Code
Long Live The King
Smoked Another SBC
 
G-Code's Avatar
 
Join Date: May 2009
Location: San Diego County
Posts: 95,384
Default Re: CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s

Quote:
Originally Posted by Gary Blair View Post
What other manifold did you compare with this TFS manifold?
Speaking of intake manifolds. Yesterday I came across my old catalog from Price Motorsports . They have listed a set of adapter plates for the A-460 heads to 429 intakes. So you could adapt a 429 TR or a dual plane intake to work with the heads.

I wonder what application that worked well for ?
__________________
IRONY IS WASTED ON THE STUPID

"My job is not to represent the world, my job is to represent the United States of America " DJT 2-28-2017

58.3% of All Statistics are made up.
G-Code is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-12-2019, 11:18 AM   #17
BBF612
Senior Member
Smoked Another SBC
 
BBF612's Avatar
 
Join Date: Jun 2011
Location: Louisiana
Posts: 7,888
Default Re: CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s

If you are going to use the same cam and lower the compression in the 600 cuin, the power will peak at a lower rpm and so the power might peak in the high 800's at around 6500 rpm (?), useing those thoughts I got this output from pipemax roughing in your engine.

- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 36.629 (usually this Length is never used)
2nd Harmonic= 20.789 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 14.514 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 11.424 (Single-plane Intakes , less Torque)
5th Harmonic= 9.269 (Torque is reduced, even though Tuned Length)
6th Harmonic= 7.798 (Torque is reduced, even though Tuned Length)
7th Harmonic= 6.730 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 5.919 (Torque is greatly reduced, even though Tuned Length)
Note> 2nd and 3rd Harmonics typically create the most Peak Torque
4th Harmonic is used to package Induction System underneath Hood


And if it peaks at 7000 rpm like the 565 with a higher VE, I got this output.

- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 34.135 (usually this Length is never used)
2nd Harmonic= 19.374 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 13.526 (ProStock or Comp SheetMetal Intake)
4th Harmonic= 10.646 (Single-plane Intakes , less Torque)
5th Harmonic= 8.638 (Torque is reduced, even though Tuned Length)
6th Harmonic= 7.267 (Torque is reduced, even though Tuned Length)
7th Harmonic= 6.272 (Torque is greatly reduced, even though Tuned Length)
8th Harmonic= 5.516 (Torque is greatly reduced, even though Tuned Length)
Note> 2nd and 3rd Harmonics typically create the most Peak Torque


All this is assuming that the intake runners flow as much as the head does.

Last edited by BBF612; 11-12-2019 at 11:21 AM.
BBF612 is offline   Reply With Quote
Old 11-12-2019, 01:35 PM   #18
G-Code
Long Live The King
Smoked Another SBC
 
G-Code's Avatar
 
Join Date: May 2009
Location: San Diego County
Posts: 95,384
Default Re: CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s

current thoughts: .. Heads need just a tad bit of work. might go to 2.45" intake

Compression 11:1 - 11.25:1

Cam that has been in 565 was just a tad big for that combo. should
work fine for a 600" pump gas deal. cam ran @ 4* advanced.

Might "manipulate the ex. side by changing T&D rockers from 1.8
to 1.7 or 1.6.

At this point in time :My best EWAG (Educated WILD ASS GUESS)

Single 4 = 1.6hp per cubic inch @ 6,800 = 960 hp +/- 8 hp. Should get close to 800 lbs ft at 6,000.

Either T/R with dual 1,050's @ 6,800-7,100 1,015 hp +/- 10. Better than 820 lbs ft at 6,000


Just my current thoughts on it.
__________________
IRONY IS WASTED ON THE STUPID

"My job is not to represent the world, my job is to represent the United States of America " DJT 2-28-2017

58.3% of All Statistics are made up.

Last edited by G-Code; 11-12-2019 at 01:37 PM.
G-Code is offline   Reply With Quote
Old 11-12-2019, 02:00 PM   #19
BBF612
Senior Member
Smoked Another SBC
 
BBF612's Avatar
 
Join Date: Jun 2011
Location: Louisiana
Posts: 7,888
Default Re: CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s

598.286 Cubic Inches @ 6800 RPM with 107.00 % Volumetric Efficiency PerCent

Required Intake Flow between 410.6 CFM and 436.0 CFM at 28 Inches
Required Exhaust Flow between 266.1 CFM and 305.2 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 880.1 916.3 934.4 952.5
Peak Torque Lbs-Ft 752.8 783.7 799.2 814.7

HorsePower per CID 1.471 1.532 1.562 1.592
Torque per Cubic Inch 1.258 1.310 1.336 1.362

BMEP in psi 189.7 197.5 201.4 205.3
Carb CFM at 1.5 in Hg. 1260 1401 1472 1543

Target EGT= 1307 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 99.6 to 101.0 Octane required range
Air Standard Efficiency = 62.22586 % for 11.000:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 847.3 949.2 1051.0




598.286 Cubic Inches @ 6800 RPM with 111.00 % Volumetric Efficiency PerCent

Required Intake Flow between 430.6 CFM and 457.5 CFM at 28 Inches
Required Exhaust Flow between 279.1 CFM and 320.1 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 931.0 969.3 988.4 1007.6
Peak Torque Lbs-Ft 795.1 827.8 844.1 860.5

HorsePower per CID 1.556 1.620 1.652 1.684
Torque per Cubic Inch 1.329 1.384 1.411 1.438

BMEP in psi 200.4 208.6 212.8 216.9
Carb CFM at 1.5 in Hg. 1307 1454 1527 1601

Target EGT= 1290 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 100.4 to 101.0 Octane required range
Air Standard Efficiency = 62.22586 % for 11.000:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 920.7 1011.5 1102.3


Have you measured the intake tract length so you know whick maniflod to use?

And have you thought about trying to see if a C-460 manifold would fit/or be made to work?
BBF612 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-12-2019, 03:58 PM   #20
G-Code
Long Live The King
Smoked Another SBC
 
G-Code's Avatar
 
Join Date: May 2009
Location: San Diego County
Posts: 95,384
Default Re: CARB Talk: What plays into making one carb more efficient than the next. BSFC #'s

A C-460 single intake would have to be Spliced/sectioned to fit on A-460 heads. I looked at that some 15 years ago.

it should be able to make 1.6 hp per cube with a single 4 but it won't be done with my 1,050. Not sure if the 1,200 will flow enough air, but it will have a better chance than will the 1,050.
__________________
IRONY IS WASTED ON THE STUPID

"My job is not to represent the world, my job is to represent the United States of America " DJT 2-28-2017

58.3% of All Statistics are made up.
G-Code is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 06:55 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 0%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Yellow Bullet LLC
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.