I had my LT1 engine rebuilt because it threw a rod and had it professionaly rebuilt by a large company that has been around for decades and everything was replaced wtith new parts where they could be. But now my car is slower off the line and overall.
Before I could smash the pedal and the tires (posi) would chirp going into 2nd and I could peel out and just had great acceleration off the line. Now it feels real sluggish.
I'd like to add this is a 96 Caprice and I have now put a good 5-6k miles on it over the last year since it was rebuilt.
It was great one day....leaked oil....but ran awesome....then it blew....was rebuilt and now it doesnt perform to how I feel the LT1 should.
The gears are 2:93 and its a tow package B4U and I have no exhaust upgrades and stock cats. Could a fresh engine and old exhaust cause such a HUGE difference? I can't even peel out with the brake pedal to the floor.
2007-07-11 10:44:59 · 7 answers · asked by k g 3 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
It was supposedly built to spec as Chevy made it, but I suspected them to fudge it up somehow. It just stinks that it isn't as quick. It is like night and day. A cat back sytstem is in the future as well as gears possibly.
2007-07-11 11:14:45 · update #1
Large generic engine rebuilders use pistons with less compression and more ring drag than the Chevrolet factory. They also use generic reground cams that don't always match factory specs exactly. They often "sink" valve seats or install valve seat rings that hurt cylinder head flow terribly and further reduce compression.
These engines always have less power than the original. Most of the times this goes unnoticed because the old engine is worn and powerless anyway in most cases.
Next time get a hand built quality rebuild.
2007-07-11 11:02:44 · answer #1 · answered by beth 6 · 3⤊ 1⤋
Lt1 Engine Rebuild Kit
2016-12-12 04:33:32 · answer #2 · answered by feldmann 4 · 0⤊ 0⤋
This Site Might Help You.
RE:
I had my LT1 engine rebuilt and now the car is slower, why?
I had my LT1 engine rebuilt because it threw a rod and had it professionaly rebuilt by a large company that has been around for decades and everything was replaced wtith new parts where they could be. But now my car is slower off the line and overall.
Before I could smash the pedal and the...
2015-08-16 19:30:01 · answer #3 · answered by Mariellen 1 · 0⤊ 0⤋
Lt1 Rebuild Kit
2016-11-04 21:30:14 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Like omall and beth have mention there are alot of reasons why you're not able to get the performance you once got out of the LT1. Anything from the cam grind(specs.) to the timing and flow of the heads. Btw, what cam did you decide to use on the rebuild or the you get a choice? Thro, I would think that 5-6K miles should be enough for the break-in. You may want to consider that as part of the issue here, also.
You may want to look over the article below on the LT1 rebuild.
And another thing you may want to consider is swappin out those 2.93 rear-end gears for something alill more beefier, like a set of 3.42's or 3.73's. The 2.93 may be good for gas mileage. But, are not what you need for any type of racin, like @ the strip.
Good luck!
2007-07-12 05:17:07 · answer #5 · answered by Don B 5 · 2⤊ 1⤋
This is called break in time.The engine should be up to full power in about 12 to 15k.
2007-07-11 12:35:31 · answer #6 · answered by HyperGforce 7 · 1⤊ 1⤋
I WOULD GO WITH AN EXAUST UPGRADE AND CHECK THE TIMEING THE CAMSHFT IN THE OLD MOTOR MIGHT HAVE BEEN A LITTLE DIFFERENT DID THEY DO ANY HEAD WORK THERE ARE LOTS OF REASONS THIS COULD BE HAPPENING ALSO COULD BE A TORQUE CONVERTOR PROBLEM GOOD LUCK
2007-07-11 10:52:22 · answer #7 · answered by omallory_us 5 · 0⤊ 1⤋
just bump up the timing couple degrees and feel the power
2007-07-14 18:00:27 · answer #8 · answered by dave w 2 · 0⤊ 0⤋