Last post on Jul 31, 2009 at 9:26 AM
You are in the Speed Shop Tuning and Modification
What is this discussion about?
Dodge Charger, Engine
#11 of 14 Re: Add Horsepower [valataria]
by Mr_Shiftright HOST
Oct 21, 2008 (12:52 pm)
No more than if they stayed in there. You can't hurt them by removing them. You might have greater risk by installing new rings. They might not seat, whereas we know the older rings are well seated.
It really all depends on how carefully they measured cylinder bore wear and how carefully they inspected the pistons and rings. I would think they'd be crazy to re-install worn rings or put pistons into an egg-shaped cylinder bore.
Not sure why your engine started knocking---one hopes it was not oil starvation but rather manufacturing defect or cap bolt stress.
#12 of 14 Re: Add Horsepower [Mr_Shiftright]
Oct 21, 2008 (3:03 pm)
I was told the knock was coming from oil pump out of tolerance. I have never heard such a thing. I post this question to two highly recommended machine shop and both said that they have never heard that. Both shops also said unless the pistions were reinstalled exacltly in its original grove,the possibilities are high that blowby will occur. Block should have been honed and new rings installed and that's the only way they can gurantee repair. This is only what I have found during my local search with machine shops and both agree on piston ring replacement.
#13 of 14 Re: Add Horsepower [valataria]
by Mr_Shiftright HOST
Oct 22, 2008 (11:27 am)
Never heard of the oil pump problem either.
Well of course the machine shop is going to say that, because they don't want any chance of a comeback whatsoever; on the other hand, the dealer is not going to be paid by the factory for throwing away perfectly good piston rings, and I can't see any reason to hone such low mileage cylinders. If you put in NEW rings, then yes, I'd hone probably. But the original rings, pistons and cylinder walls are old friends and very well acquainted.
Ring groove is merely a matter of placement. The ring sits in a groove in the piston. I presume a mechanic would not be so stupid as to not vary the notch in the ring grooves so they don't line up top to bottom, or at least check that.
If you're asking: could a mechanic make a mistake re-assembling my engine, the answer is SURE.
#14 of 14 Making HEMI 5.7 Hum
Jul 31, 2009 (9:26 am)
Well if you are loaded with extra cash one can suggest doing some serious engine work but if not and just wanting a little more out of your expectations do what I did.
Magna-Flow exhaust and Airraid air intake unit. Low temp thermostat and new platinum plugs slightly off spark. AMAZING. Under a thousand bucks and worth every dime.