Real tech discussion on design, fabrication, testing, development of custom or adapted parts for Pontiac Fieros. Not questions about the power a CAI will give.
Moderators: The Dark Side of Will , Series8217
greengoblin0129
Posts: 143 Joined: Tue Nov 08, 2005 10:48 pmLocation: Indiana
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by greengoblin0129 Tue Apr 10, 2007 9:27 pm
Is the 3800SC SII a interfering motor? Reason why i'm asking is because i'm planning on buying a highly modded 3800SC SII engine this weekend and the time chain snapped on it.
Forever-Fiero
Posts: 96 Joined: Thu Mar 30, 2006 5:53 pmLocation: Vandalia Mo.
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by Forever-Fiero Tue Apr 10, 2007 10:23 pm
No I dont think it is. I dont think any GM motor is....
cactus bastard
Posts: 290 Joined: Wed Aug 16, 2006 12:14 pmLocation: Alberta
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by cactus bastard Tue Apr 10, 2007 11:43 pm
quad 4s are interference engines :la:
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crzyone
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Posts: 4654 Joined: Wed Nov 17, 2004 12:40 amLocation: Whitecourt, Alberta, Canada
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by crzyone Wed Apr 11, 2007 12:13 pm
I think 3.4 TDC is as well
Mach10
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Posts: 2481 Joined: Thu Jul 14, 2005 6:50 pm
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by Mach10 Wed Apr 11, 2007 1:28 pm
3.4TDC isn't... But only just. You'll bend a valve if you snap the belt at high RPM.
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befarrer
Posts: 1085 Joined: Mon Feb 20, 2006 12:18 amLocation: Alberta
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by befarrer Wed Apr 11, 2007 2:28 pm
The later 3.4's are from what I read.
Mach10
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by Mach10 Wed Apr 11, 2007 4:02 pm
The timing process is basically the same for all years, and you wouldn't actually be able time these motors unless you could rotate the motor with the cams disconnected. :salute:
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S8n
Posts: 684 Joined: Fri Sep 09, 2005 11:17 pmLocation: O-Town
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by S8n Wed Apr 11, 2007 6:41 pm
All current GM V8s are interferance motors.
dratts
Posts: 61 Joined: Sat Jun 24, 2006 9:26 amLocation: Petaluma
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by dratts Wed Apr 11, 2007 7:08 pm
All current v8s? N*s and pushrod Ls1s, etc.
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Weponhead
Posts: 446 Joined: Sun Sep 04, 2005 11:38 pm
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by Weponhead Wed Apr 11, 2007 7:57 pm
i beleive it CAN be, i dont think it is if the motor has no modified cam, or rockers. its close tho, i have a set of used forged pistons with a knick from what looks to be a valve so , be cautious.
S8n
Posts: 684 Joined: Fri Sep 09, 2005 11:17 pmLocation: O-Town
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by S8n Wed Apr 11, 2007 8:27 pm
dratts wrote: All current v8s? N*s and pushrod Ls1s, etc.
That's correct. Break a chain, good bye valves.
Starlite528
Posts: 316 Joined: Sun Jul 16, 2006 6:02 amLocation: Dallas, Texas
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by Starlite528 Wed Apr 11, 2007 9:16 pm
Please enlighten me, what's an interference engine?
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befarrer
Posts: 1085 Joined: Mon Feb 20, 2006 12:18 amLocation: Alberta
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by befarrer Wed Apr 11, 2007 9:18 pm
Valves and piston share the same area in the combustion chamber.
