CorvetteForum - Chevrolet Corvette Forum Discussion

C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Dyno Sheet 421 sbc

Thread Tools
 
Search this Thread
 
Old Aug 18, 2018 | 10:39 AM
Share
  #1  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default Dyno Sheet 421 sbc
….. Dyno Sheet …
421 sbc 4.157 x 3.875
Brodix 227 CNC heads
Custom Cam by Mike Jones 261/266 108* .699/.660
JE Flattops 11.2:1 compression
….. Dyno session cut short by dyno fuel flow meter failure (E-85 ?) .....
..... Thanks Will ! ... ...

Last edited by C409; Aug 18, 2018 at 05:52 PM.
Reply
1
Old Aug 18, 2018 | 12:53 PM
Share
  #2  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Default
Nice numbers, what are the airflow numbers for the brodix 227 heads.
Reply
0
Old Aug 18, 2018 | 01:43 PM
Share
  #3  
cardo0's Avatar
cardo0
Le Mans Master
20 Year Member
 
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Default
Nice and wide power band and congratulations! Have to wonder if a vacuum pump could add some top end power to a high RPM motor like yours. Have you considered a vacuum pump for ring seal, ring flutter and blowby?
Reply
0
Old Aug 18, 2018 | 03:15 PM
Share
  #4  
dizwiz24's Avatar
dizwiz24
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 14,676
Likes: 751
From: NEwhere Ohio
Default
Wow ! Take that LSx zombies
Reply
0
Old Aug 18, 2018 | 03:41 PM
Share
  #5  
Pwnage1337's Avatar
Pwnage1337
Tech Contributor
15 Year Member
 
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
Default
Dart block?
Reply
0
Old Aug 18, 2018 | 05:18 PM
Share
  #6  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by bjankuski
Nice numbers, what are the airflow numbers for the brodix 227 heads.
.............................0.200 … 0.300 … 0.400 … 0.500 … 0.600 … 0.650 ... 0.700 .....
….. 2.080 in ……...... 154 ..... 223 ........ 270 ...... 303 ...... 312 ........ 314 ..... 316 .....
….. 1.600 ex ......... 116 ..... 150 ........ 185 ...... 208 ...... 219 ........ 224 ..... 227 .....

..... I thought the heads would bottleneck it but it turns out that the intake is choking the little guy ... not too surprising considering that I kept it under the stock hood ! ... Edelbrock Victor E ported by Eric Weingartner and an Accufab 4bbl throttle body that supposedly flows 1200 cfm ... Vacuum during the pull went from 1.05" to 1.76" @ 7000 rpm ..... from 99kpa to 95kpa ..... We were just starting to tune it when the fuel flow meter on the dyno started putting out some strange readings ... I had a WBO2S in but it was primarily reading the #8 cylinder because of where the bung was located on the dyno headers ..... There was likely 10-15hp left on the table when we quit making pulls .....
Last edited by C409; Aug 18, 2018 at 05:37 PM.
Reply
0
Old Aug 18, 2018 | 05:24 PM
Share
  #7  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by cardo0
Nice and wide power band and congratulations! Have to wonder if a vacuum pump could add some top end power to a high RPM motor like yours. Have you considered a vacuum pump for ring seal, ring flutter and blowby?
..... Thanks ! ... I bracket race ... this is not a max effort , squeeze every last pony out of it deal ... and I spend all my money keeping this rig going , so there's no extra $ for extravagance ... I personally do not consider 7000 rpm to be a high rpm motor .....
Last edited by C409; Aug 23, 2018 at 07:53 AM.
Reply
0
Old Aug 18, 2018 | 05:26 PM
Share
  #8  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by Pwnage1337
Dart block?
..... Little M with steel main caps .....
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Aug 18, 2018 | 06:44 PM
Share
  #9  
rklessdriver's Avatar
rklessdriver
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Default
Looks solid.

I wish you would have been able to really tune on it.
Will
Reply
0
Old Aug 18, 2018 | 07:31 PM
Share
  #10  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by rklessdriver
Looks solid.

I wish you would have been able to really tune on it.
Will
..... Me Too ! … the BSFC curve was the same shape but the #'s dropped to 0.17-0.18 with fuel flow showing 80's gph - 120 gph … and the power curve was the same (or very close) to the dyno sheet in post #1 … Its a Miracle ! … Thanks for your help ! …..
Last edited by C409; Aug 23, 2018 at 07:54 AM.
Reply
0
Old Aug 18, 2018 | 07:36 PM
Share
  #11  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by dizwiz24
Wow ! Take that LSx zombies
….. AND … I run a full exhaust system … the car is tagged , registered , and insured for street use … we get out now and again to put smiles on the faces of motorheads and kids …..
Last edited by C409; Aug 18, 2018 at 07:37 PM.
Reply
0
Old Aug 19, 2018 | 08:02 AM
Share
  #12  
blackozvet's Avatar
blackozvet
Safety Car
Conversation Starter
Liked
Loved
Community Favorite
 
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
Default
nice, was that engine dyno or in the car ?
Reply
0
Old Aug 19, 2018 | 09:30 AM
Share
  #13  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by blackozvet
nice, was that engine dyno or in the car ?
….. Engine Dyno … Those would be awesome numbers at the rear wheels ! …..



Reply
0
Old Aug 19, 2018 | 02:20 PM
Share
  #14  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Default
Looks nice!
Reply
0
Old Aug 20, 2018 | 05:46 AM
Share
  #15  
bjankuski's Avatar
bjankuski
Safety Car
20 Year Member
Photogenic
Liked
Top Answer: 1
 
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Default
I assume the cam is a solid roller? What lifters are you running?
Reply
0
Old Aug 20, 2018 | 07:49 AM
Share
  #16  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
Originally Posted by bjankuski
I assume the cam is a solid roller? What lifters are you running?
..... Comp Cams Small Base Circle lifters # 891 … Had them rebuilt by Comp … new axles , rollers , and needles - and OD polished for around $13ea …..
Reply
0
Old Aug 23, 2018 | 08:29 AM
Share
  #17  
C409's Avatar
C409
Thread Starter
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
Default
….. Engine and trans are back in the car … now to get it all hooked up and out to the track for the fine tuning ! …..


Reply
0
Old Mar 9, 2021 | 07:39 AM
Share
  #18  
BLWN1's Avatar
BLWN1
Drifting
20 Year Member
All Eyes On Me
Photogenic
Liked
 
Joined: Feb 2006
Posts: 1,721
Likes: 21
Default
Still available
Reply
0

Get notified of new replies

To Dyno Sheet 421 sbc

Back to Subforum
C4 Tech/Performance
View Next Unread
Help removing pass exhaust manifold




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 08:56 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE