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Old 08-08-2011, 08:31 PM   #1 (permalink)
oil pan 4
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Next engine build

It will be based off the GM LS3 serries and will use fuel injection and be all motor, no turbo.
I would like to use the GM VVT, but no one makes an after market controler that can do what I want. I plan to install mechanical limiters on the cam phaser and if I have to I will just figure out a way to hot wire the cam controler to just go on/off. "On" keeps the cam advanced for fuel economy, smooth idel and low speed torque. "Off" advances the cam how ever many degrees I see fit. This is ideal for high power high speed operation.
I will employ all the efficiency boosting tricks used on my diesel plus a few more, such as eaglerod.com "esp aromor" treatment for the crank.
This build will be done with mostly stock parts to save money, stock block, heads, intake, ignition and so on.

My special improvements are going to include unusally high compression, would like to run about 12.5:1 C/R maybe even higher on regular pump gas. Easy to do with a little 1940s technology.

I would like to harness the GM DoD that shuts down half the cylinders at light load but so far there has been 0 aftermarket support for DoD. I am thinking this might be a no go unless some how I figure out a way to get a factory style computer to do what I want.
GM expermented with five test corvetts fitted with DoD LS3s and they were able to hit 35mpg on the highway no problem.

Another me only feature I would like to try is inconel exhaust valves or "extreme duty race valves" that claim to be as good or better than inconel 625, but cheaper. I am having trouble finding inconel exhaust valves for sale by them selves. Also would like to use ceramic crowned pistons, so they dont melt.
This is to make it safer to experment with tunes using the hotest burning air fuel ratios like 13.2:1 for mild moderate acceleration and 15.7:1 and leaner cruse. Normally these A/F ratios are avoided. From a thermodynamic stand point this is ideal but from a materials stand point its bad, unless you are willing to spend a nice bit of money on materials the major auto makers would never consider using.

Since I am cheap and want to run regular gas on a high compression engine I will do this by 1 living at 4400 feet elevation (12% less air so 12:1 at 4400ft is a more like 10:1 at sea level).
2 running water methanol injection above an RPM to be figured out later on and at low manifold vacuum around 5'' of Hg or less. I am thinking that retarding the cam and the water methanol would kick in at about the same time.

The new engine and over all car weight loss coupled with a 6-speed transmission I am thinking I will be able to pick up about 9mpg (up to 12mpg if I can use DoD) and about 200 horsepower over the old carbed engine in there now.

My economy boosters will be, lean burn, hot burn, fuel injection, regular gas, conversion to a standard transmission and losing a couple hundred pounds.

Any one have any other theam ideas I can use on the GM LS serries?

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