Author Topic: 428 CJ resto build  (Read 3257 times)

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aj

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428 CJ resto build
« on: April 10, 2019, 10:12:09 PM »
Finally finished motor and posted results in dyno section.  I'm thankful for this forum and the folks that take the time to share their knowledge.  I had the motor nearly finished a year ago when I discovered this forum.  After pouring though old posts,  I ended up completely disassembling motor to implement to tips/knowledge gleaned from this site.  2 years later...It was worth the back track.

Numbers for the fairly mild 462 CJ were:

486 hp @ 5600
525 torq @ 3800

Thanks
Adrian Jacobs

   
« Last Edit: April 10, 2019, 10:16:14 PM by aj »
Adrian Jacobs
Weatherford, TX
1970 Shelby GT500 
1970 Boss 302

427LX

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Re: 428 CJ resto build
« Reply #1 on: April 11, 2019, 08:34:05 AM »
Nice build and great numbers! 
Is this headed for a Mustang or Fairlane and what's the final drive train setup?

chilly460

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Re: 428 CJ resto build
« Reply #2 on: April 11, 2019, 08:54:09 AM »
That thing hung on really well with a mild cam for 462ci, guessing the wide LSA helped with that?  Wonder if wide LSA is to help hedge the relatively high static CR? Guessing Brent may chime in since he picked out the cam.  I run a 224/230 in 390 that peaks at 5400 but on tighter separation. 

I like the build a lot, good numbers and broad powerband with tweaked OEM induction, very nice. 

aj

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Re: 428 CJ resto build
« Reply #3 on: April 11, 2019, 10:07:44 AM »
Motor will be paired with stock CJ exh manifolds, C6 and 3:50’s.  Going in a 70 Shelby Mustang is reason for all the OEM stuff.

Dyno’ed on 93 pump gas with no subsequent tuning while on the dyno.   Only had 3 pulls after 30 minute break-in session the night before.

It gained 8-10 hp on each subsequent pull.  Maybe with some tuning or a touch more timing and octane coulda squeezed a bit more out of it.  But objective was just to break in, check for leaks, noises( and grenades).

« Last Edit: April 11, 2019, 10:11:23 AM by aj »
Adrian Jacobs
Weatherford, TX
1970 Shelby GT500 
1970 Boss 302

blykins

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Re: 428 CJ resto build
« Reply #4 on: April 11, 2019, 10:24:35 AM »
I'm hoping the A/F ratios were wrong on the sheet.  It won't last long like that. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
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www.lykinsmotorsports.com
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rockhouse66

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Re: 428 CJ resto build
« Reply #5 on: April 11, 2019, 11:43:31 AM »
Very nice results.  My almost identical build, including the cam (224/224 @ .050”, .616 lift, 104 ICL, 110 LSA), but run on dyno with stock cast manifolds and water pump operating, made about 10 more TQ but 50 less HP.  Stock CJ 735 carb too.

« Last Edit: April 11, 2019, 11:45:51 AM by rockhouse66 »
Jim

cammerfe

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Re: 428 CJ resto build
« Reply #6 on: April 11, 2019, 01:00:07 PM »
FWIW, it's often been said that a set of headers is worth 50 HP over manifolds on a good FE.

KS

aj

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Re: 428 CJ resto build
« Reply #7 on: April 11, 2019, 02:12:01 PM »
Brent,  first thanks for setting me up with the cam.

  i wondered about those A/F numbers.  I knew they were lean but not sure of accuracy. Actually there was a bit of distracting  drama. Tthe motor displayed odd behavior during first moderate load put on it.  So with “the meter running”  I frantically swapped guts of dizzy from Pertronix back to single point and old yeller coil.  Fortunately fixed that problem (actually now I think it was a poorly crimped coil wire that I discovered at same time...rather than Pertronix stuff). 

Since the carb was a temporary loner from my B2...Your point is well taken and I’ll be aware when I eventually get the correct 735 and dial in jetting.

Adrian Jacobs
Weatherford, TX
1970 Shelby GT500 
1970 Boss 302

blykins

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Re: 428 CJ resto build
« Reply #8 on: April 11, 2019, 02:38:18 PM »
A quick look at the spark plugs will tell if it was real lean or not. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
Instagram:  brentlykinsmotorsports
YouTube:  Lykins Motorsports

427LX

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Re: 428 CJ resto build
« Reply #9 on: April 11, 2019, 09:16:44 PM »
Was an A/F gauge within view while running the engine? I would have backed off the throttle.

aj

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Re: 428 CJ resto build
« Reply #10 on: April 12, 2019, 09:11:13 AM »
Photos of plugs look lean ..but I 'm no expert.   Freckles on porcelain maybe some detonation too ???

Used a stock jetted Boss 302 carb so I'm wondering if the headers (vs stock manifolds) caused the lean condition ? 

I'm tempted to dyno again to sort it out better...maybe using stock CJ exhaust manifolds rigged up.   
« Last Edit: April 12, 2019, 09:15:17 AM by aj »
Adrian Jacobs
Weatherford, TX
1970 Shelby GT500 
1970 Boss 302

BigBlueIron

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Re: 428 CJ resto build
« Reply #11 on: April 12, 2019, 09:34:57 AM »
Very lean and to much total timing. Just my guesstimate

blykins

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Re: 428 CJ resto build
« Reply #12 on: April 12, 2019, 09:53:05 AM »
To be straight up honest, I'd take it somewhere else.   A dyno operator that would knowingly load an engine and pull it at WOT (multiple times) with 15-16:1 A/F ratio showing isn't your friend.    Lean is mean, but that only goes so far....

We put a very short pull on the engine to make sure the carb is right before continuing, and you can usually tell when the engine is first loaded  into the main circuit whether or not things are  kosher.

Do you have a borescope?  Would be nice to check the tops of the pistons before continuing.  The one plug is gleaming white and it's hard to see from the picture what's on the other plug, but I'd feel better about investigating given the circumstances.   

Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
Instagram:  brentlykinsmotorsports
YouTube:  Lykins Motorsports

Falcon67

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Re: 428 CJ resto build
« Reply #13 on: April 12, 2019, 10:14:36 AM »
Thats the plug appearance that says you're way lean and/or you better be running VP 110.  In car testing with my older Innovate unit usually shows best power below 13:1.  16:1 is coasting under closed throttle, not for WOT. 

cjshaker

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Re: 428 CJ resto build
« Reply #14 on: April 13, 2019, 12:22:33 PM »
Sure looks like speckling from detonation on the bottom plug in that first picture. I'd be a little upset that he ran it that way. With 16:1 showing on AFR, he should have known NOT to run it at WOT.
Doug Smith


'69 R-code Mach 1, 427 MR, 2x4, Jerico, 4.30 Locker
'70 F-350 390
'55 Ford Customline 2dr
'37 Ford Coupe