Shark Racer

I know I've dogged this motor in the past, said it's a piece of poopie or what have you, but I've got to give it credit.

When I first got the engine installed, I g-teched 0-60 at about 8.1 seconds. Not, um, horrible, but definitely not Corvetteesque.
I fixed my ignition timing, tuned the distributor curve, and got time down to 7.6 or so.

Next, I went for a true dual exhaust, and got down to about 7.3 seconds. I seemed to hit a plateau, so I just waited around for the next best thing to come along.

August of last year, I installed headers and the 0-60 time dropped from 7.3 to 6.6 seconds. Not bad at all!

Then I got the carb rebuilt, double checked all the timing and my 0-60 time dropped down to 6.4 seconds.

With my new ultraflo mufflers in place, 0-60 time came in at just a little less, about 6.36 seconds.

I finally got the center section of the car down, went from 2 1/4" cats to 2 1/2" high flow cats, and had an H-pipe welded in. The car idled quieter, had less resonance at 1500 rpm, and just as much bark as before, perhaps even a little more! I could actually hold it in third gear at about 3000 RPM and hardly feel any engine compression whatsoever.

0-60 time is now a svelte 6.2 seconds, and I could probably knock it down to 6.1 as the G-tech curve showed I was launching 0.1G slower than I did with my best run before the H-pipe.

So, what does this all mean? If you've got a vette, and you just want a cruiser, you will get some pretty decent performance out of this motor. Throw in a mild cam and do some portwork on the heads and you'll have an engine that will perform very similarly to a 92-97 LT1 engine.


Oh, and here's the new setup!



And also, according to the Gtech, 171 RWHP, 235 RWTQ.


[Modified by Pacin'California, 3:12 PM 3/24/2004]

battsup

congrats on your accomplishments :thumbs:

on a totally other note now your car is just as fast as a stock 78 :jester
thats weird because i thought the goodwrench engine was rated at 300hp

Fevre

Steve

I agree, hard to beat the hp per $, I got mine for under $1400 shipped to my office. I snuck a little bigger came in and was happy has heck, of course it had been sitting for a few years so I was happy to just have it running. :)Anyone on a budget that wants a cheap modest cruiser eng with a little pep can't go wrong with the LM1. As you know I put diff heads and roller cam in and the bottom held up just fine to the beating I put on it. It is just 'resting' on my eng stand ready to jump back into action if called upon. :jester





[Modified by Fevre, 8:09 PM 3/24/2004]

Shark Racer

Battsup- The stock 78 L-48 is rated at 7.6 with a 4-speed. The L-82 was 6.5 with a 4-spd in a magazine, 6.7 by GM.

-Steve

79VetteMike

What cam , intake,ignition and carb do you have?

battsup

thanks for the correction steve :thumbs:

Wrecked82

I did a few Gtech runs in my LM1 Crossfire with just a few mods - self-ported manifold, tbi spacers (oh no!), borlas, new cat - in near 100 degree temps last summer and got 7.1 sec fastest. Need to re-test before temps start going up again. The LM1 is not a real dog - just not a greyhound ;) :cry :lol:

red79c3

:thumbs:

Shark Racer

Cam is the standard L-48/327-300 cam. .390/.410, 195/202 duration.
Performer #3701 EGR intake.

Stock HEI with Lars kit.

And a stock jetted L-82 q-jet!

-Steve

79VetteMike

Sounds like you have a properly matched combination of parts. How do those mufflers sound? (in relation to Flowmaster 40's)

Double Aught

:cool:

Fevre

I ran summit cam with 204/214 dur and .424/.444 lift.

'79ProwlerOrange

Thats awesome Steve. lets me know that exhaust is really gonna help my car alot. but i plan on doing a new cam and heads, because i need to make the vette beat the Typhoon's 4.88 0-60. i can have my vette loosing to my truck :crazy: :smash:

your car is coming along quite nicely. get some sound of the way the new exhaust sounds :thumbs:

terryrudy

Very nice Steve! So whats next? :)
-terry

Shark Racer

Rhymes with "Blore onedred", which isn't much of a word, but you catch the drift.

I should be getting a job this summer and can save up for a wonderblock. The sig plans have changed a bit...

Also, planning on doing rear suspension. Hard to say which'll come first, but I think the bearings/rear end should be a higher priority.

-Steve

cardo0

:cool: Thanks for posting your results Pacin'. It's good to see some one else testing the LM1 motor and happy to talk about it. These low compression motors should live a long time too as if the rpms stay below 5,500. I'm hoping for a engine that will take a lot of 1/4 mile abuse and still get me to work. :chevy