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07-05-2008, 02:21 PM
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#1 |
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Registered User
Status: Offline
Join Date: Jan 2006
Member ID: 39913
Pics: My Gallery
Location: Texas
Age: 29
Posts: 2
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93 Chevy V-6 to V8 swap spark knock
Its been awhile since i have been on the site due to me being in Iraq for OIF V. A couple of years ago I swapped my 4.3L for a 5.7L TBI. The engine I built was bored .040 over, stock crank, rods, intake, heads. I installed a edelbrock performer cam. My compression ratio is 9.39:1. I have a spark knock while accelerating. I run 91 octane fuel, that makes it a little better but it wont go away. I have my timing set correctly. Do I need to use a proggramed chip? Someone please help!!!!
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07-05-2008, 05:44 PM
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#2 | |
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Premium Member #79
Supporting Member
 Status: Offline
Join Date: Sep 2006
Member ID: 55062
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Location: Bardstown, KY
Age: 29
Posts: 491
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Re: 93 Chevy V-6 to V8 swap spark knock
Quote:
Are you running a stock 5.7 tune? You will defiantly need a tune to make it run right. Do you have your distributor set to 0 degrees?
1994 Full Size Blazer
-383, World product SR Tourqer heads -1.5 Roller Rockers -Scat Crank, Speed pro pistons -Voodo Cam 454"/.468 pn 60101 -Built 4L60E -4.10's 2009 Malibu 1LT http://videos.streetfire.net/video/4...db00abc722.htm |
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07-05-2008, 10:18 PM
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#3 | |
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Registered User
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Join Date: Jul 2005
Member ID: 30914
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Location: Hurst, Texas
Posts: 2,913
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Re: 93 Chevy V-6 to V8 swap spark knock
Quote:
He makes it sound like he is running on the stock 4.3 chip and stock 46# 4.3 injectors.
1983 G20 Conversion Van, 310 TPI, 9.5:1 compression, Custom Reed Roller cam, TBI 305 187 Swirl Ports, Doug Thorley Tri-Y headers, dual 3" exhaust, 4L60(1992 700r4), 3.08 gears. 7730 ECM
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07-06-2008, 05:09 AM
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#4 |
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Registered User
Status: Offline
Join Date: Jun 2003
Member ID: 6824
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Location: VA
Age: 46
Posts: 401
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Re: 93 Chevy V-6 to V8 swap spark knock
Are the knock sensors for the 4.3 and 5.7 the same? If not, that could be your issue.
Have you vefified your fuel pressure?
90 454SS 496 TBI
 12.43 @ 106 mph92 454SS Stock with WynJammer
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07-06-2008, 04:37 PM
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#5 | |
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Supporting Member
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Join Date: Nov 2007
Member ID: 77380
Pics: My Gallery
Location: TN
Age: 39
Posts: 372
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Re: 93 Chevy V-6 to V8 swap spark knock
Quote:
No, the 4.3 uses two knock sensors.
1993 S10, 355ci.V8, MPFI, 2" TB, 6395 ECM, $0D Mask, TunerCat RT, Datamaster, Comp 280H Magnum cam, Elderbrock Performer RPM heads, 4L60E, 8.8 rear, 8.90s 1/8 mile.
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07-06-2008, 08:26 PM
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#6 |
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Registered User
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Join Date: Jul 2008
Member ID: 92081
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Location: 45768
Age: 16
Posts: 10
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Re: 93 Chevy V-6 to V8 swap spark knock
hi i am new to this site so if i screw up i apalogize. i am 16 and have a 93 gmc siarra and want to put a 5.7 or (350) into it. i would like to have it done by te end of the summer i was thinking junk yard drop in. is there any help/advice you could give me. wht i will need to do what i will need to get so on. i would really appreciate the help thanks.
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07-07-2008, 06:56 AM
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#7 | |
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Premium Member #79
Supporting Member
Status: Offline
Join Date: Sep 2006
Member ID: 55062
Pics: My Gallery
Location: Bardstown, KY
Age: 29
Posts: 491
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Re: 93 Chevy V-6 to V8 swap spark knock
Quote:
Thats what I was thinking. You need a V8 memcal, injectors, and knock sensors to start. Then get a tune.
1994 Full Size Blazer
-383, World product SR Tourqer heads -1.5 Roller Rockers -Scat Crank, Speed pro pistons -Voodo Cam 454"/.468 pn 60101 -Built 4L60E -4.10's 2009 Malibu 1LT http://videos.streetfire.net/video/4...db00abc722.htm Last edited by 94Blazer383 : 07-07-2008 at 06:57 AM. |
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