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Post by Custom88 on Mar 23, 2005 16:50:47 GMT -6
Is the 3.5L the only N* engine with the plastic intake manifold or does the 4.0 V8 have it as well? Just makes me a little nervous having one since the 3800 had such horror stories about the plastic manifolds failing and seizing the engine. incase you don't know what the plastic manifolds look like:
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Post by JimW on Mar 23, 2005 18:07:04 GMT -6
Classics have it, however the N* doesnt fail like the 3800NA does, the EGR stovepipe...doesnt that heat up the plastic, comprimising the integrity of the NA intake manifold causing the failure?
the EGR system is located differently on the Northstar.
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Post by Marc on Mar 28, 2005 11:00:47 GMT -6
2nd generation 4.0s also have the plastic intake manifold, but I've never heard of a failure of one. _________________ GM!!! BRING BACK OLDS!!!
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Post by Aurora40 on Mar 28, 2005 11:09:51 GMT -6
I believe all GM V-layout engines, from the mighty LS-7 V8, down to the 3.5L V6 have this type of intake manifold. The only exception is on forced induction cars where the manifold is typically part of the blower (as they are usually roots-type blowers). I believe the 3800 problem is not due to the material as much as to the overall design, and apparently many of the problems are from lack of use of the required coolant supplement tablets. I guess I'm the only one who did the airbox wrap...
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Post by Custom88 on Mar 28, 2005 11:14:07 GMT -6
I believe all GM V-layout engines, from the mighty LS-7 V8, down to the 3.5L V6 have this type of intake manifold. The only exception is on forced induction cars where the manifold is typically part of the blower (as they are usually roots-type blowers). I believe the 3800 problem is not due to the material as much as to the overall design, and apparently many of the problems are from lack of use of the required coolant supplement tablets. I guess I'm the only one who did the airbox wrap... it's true about the 3800 being of a bad design. after lookin over teh 3.5 I see it does not have teh same problem. On the 3800 the EGR stovepipe entered the plastic manifold and passed right by the coolant passages. Over time the heat of the EGR stovepipe would burn a hole in the plastic and allow coolant to enter the engine. The plastic manifolds don't seem to be a problem if designed correctly, which the 3800 wasn't. It was just the only engine I was really familiar with since it was the only engine my family ever really owned that was a v6 basically.
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Post by auroralover on Mar 28, 2005 13:00:25 GMT -6
Was this problem corrected on the 3800 Series II? My Dad has a Bonnie with the 3800 Series II with 75,000 miles and no problems.
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Post by auroralover on Mar 28, 2005 13:02:48 GMT -6
I believe all GM V-layout engines, from the mighty LS-7 V8, down to the 3.5L V6 have this type of intake manifold. The only exception is on forced induction cars where the manifold is typically part of the blower (as they are usually roots-type blowers). I believe the 3800 problem is not due to the material as much as to the overall design, and apparently many of the problems are from lack of use of the required coolant supplement tablets. I guess I'm the only one who did the airbox wrap... Bob, what is the purpose in doing the airbox wrap? Have you noticed any significant changes in performance???
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Post by Custom88 on Mar 28, 2005 13:28:11 GMT -6
Was this problem corrected on the 3800 Series II? My Dad has a Bonnie with the 3800 Series II with 75,000 miles and no problems. the 3800 Series II engine is the one that has that problem. The Series I engine did not have the problem.
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Post by JimW on Mar 28, 2005 14:20:41 GMT -6
Wait til 80K to 100K miles, thats when the ol stovepipe fails.
I would start monitoring it now in that Series II
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Post by Aurora40 on Mar 28, 2005 16:32:16 GMT -6
Bob, what is the purpose in doing the airbox wrap? Have you noticed any significant changes in performance??? Definitely not significant, nor did I expect it would be. One thing I do notice is that after a drive, the airbox material used to feel incredibly hot. Now it feels cold to the touch, even on hot days. I used to notice a performance decrease after extended driving, and I do not notice that anymore. Whether that is due to heatsoak of the airbox that has been addressed, or whether it's from the engine breaking in, or a trick of my mind, I don't know.
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