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Is the 3800SC SII a interfering motor?
Posted: Tue Apr 10, 2007 9:27 pm
by greengoblin0129
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.
Posted: Tue Apr 10, 2007 10:23 pm
by Forever-Fiero
No I dont think it is. I dont think any GM motor is....
Posted: Tue Apr 10, 2007 11:43 pm
by cactus bastard
quad 4s are interference engines :la:
Posted: Wed Apr 11, 2007 12:13 pm
by crzyone
I think 3.4 TDC is as well
Posted: Wed Apr 11, 2007 1:28 pm
by Mach10
3.4TDC isn't... But only just. You'll bend a valve if you snap the belt at high RPM.
Posted: Wed Apr 11, 2007 2:28 pm
by befarrer
The later 3.4's are from what I read.
Posted: Wed Apr 11, 2007 4:02 pm
by Mach10
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:
Posted: Wed Apr 11, 2007 6:41 pm
by S8n
All current GM V8s are interferance motors.
Posted: Wed Apr 11, 2007 7:08 pm
by dratts
All current v8s? N*s and pushrod Ls1s, etc.
Posted: Wed Apr 11, 2007 7:57 pm
by Weponhead
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.
Posted: Wed Apr 11, 2007 8:27 pm
by S8n
dratts wrote:All current v8s? N*s and pushrod Ls1s, etc.
That's correct. Break a chain, good bye valves.
Posted: Wed Apr 11, 2007 9:16 pm
by Starlite528
Please enlighten me, what's an interference engine?
Posted: Wed Apr 11, 2007 9:18 pm
by befarrer
Valves and piston share the same area in the combustion chamber.
Basically, If you break a timing chain or timing belt, the valves hit the pistons, and bend stuff.