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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

Thread: Ways to improve gas mileage during a tune-up/intake manifold replacement? Reply to Thread
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  Topic Review (Newest First)
09-23-2006 01:10 PM
scott_s It is on the FET site Prepping Larry's Valves I believe.

These valves are different as the intake and exhaust are done on the bottom and the intake on the top. These are actually stepped as you can see from the one side picture. There is a science to the size of the steps. Mike's are grooved on the top of the intake valve.
09-23-2006 12:43 PM
Reed Hmmm. I seem to recall reading on a webpage, maybe one of MPGMikes's, about how to modify your own valves to look like that. I will have to go back and search around.
09-23-2006 12:13 PM
scott_s Here are some links to pics of the Metric Mechanic valves I mentioned. With these valves they tune their engines for ~ 20% less fuel. They also help with detonation. The BMW heads he works with are prone to cracking, with these valves he said they have not had a head come back cracked in the 16 years they have been using them. Except from a few people that super over heated their engines and kept on running them.

09-23-2006 11:54 AM
Reed Hmmm. I have a couple extra Mopar smallblock oi lfilters in my garage, and if I read the oil filter comparison page those should fit.

Here is kind of a newbie question- when I go to the parts store to get the hotter spark plugs, what number should I ask for? I am going to get regula rold Champions, but I don't have a clue what to tell the counter guy to make sure I get a two step hotter plug.
09-23-2006 11:46 AM
scott_s I believe the type of turblance would determine if it is good or not. A surface that is rough with no thought, could cause things to be worse than the smooth surface, as far a flow. The turbulence would be every which way even fighting the direction you want the air to flow. But a surface with lines in it at a certain pitch can create an effect that will be like moving the air on rollers. Both the random rough surface and the lined surface will help mix the mixture more, with the lined surface mixing better, but the random rough surface would loose flow. Mike calls his intake lines Powre Lynz.
09-23-2006 03:48 AM
Originally Posted by Reed
Can anyone tell me a part number for a larger size oil filter?
For the largest one look at a 5.0 mustang, it should fit depending on what car you have, or the viper one
09-23-2006 02:44 AM
tkelly27 the extra TB gasket gave me seat of the pants faster, and it was part of the mileage coctail I threw at my horizon to get it from an 18mpg in disrepair, to 23-24mpg after a tune up, and 29-30mpg after all the goodies.

Experiment with plugs. Too hot and you'll ping, not a huge deal on an N/A engine, just take it back a plug range. I'd say starters go 2 heat ranges up, I like NGK's, some people like other brands. In my 2.3 volvo I opened up the gaps pretty wide (.005 over) to give it better low end. The overdrive was such that on the highway it was in very low RPM's, so it felt like it pulled better on the freeway and I was pushing 30mpg in that brick too. Do some reading about plug gapping and heat range theory, it's fairly simple stuff and the best part is it's free/nearly free!

Also, from what I understand a good burn is a complete burn, not a necissarily hotter one. I'd need someone who knew more chemestry to explain why. You won't burn up the chevy with a more complete burn, they burn up by themselves... oops!
09-23-2006 02:14 AM
Hotter plugs?

How much hotter and what brand?
09-23-2006 01:21 AM
tkelly27 http://minimopar.knizefamily.net/oilfilterstudy.html

TB spacer, timing advance, and hotter plugs helped out my N/A 2.2 horizon and N/A 2.3 volvo gain some mileage. I would not do any of those to a turbo dodge engine, the risk for detonation is too much for my liking.
09-23-2006 01:13 AM
Reed These are great ideas! Keep them coming!

Can anyone tell me a part number for a larger size oil filter?
09-23-2006 12:49 AM
kaijhe_jsziack I thought it was generally a rule of thumb to decrease turbulence in the intake. That's why those tornado thingys don't work.

Also, wouldn't a screen have a similar effect in the intake?

And I had another question. Sorry, I know this isn't my thread, but I'm still curious. So, if I bought a 327 crate motor and built it up with a sort of vapor injection: wouldn't I run into problems with excessively high exhaust temps because it burns so well? Or would I expect more power and COOLER temps because the burn is "exploding" rather than "burning"? I just want to see if I read this right.

Cause I had a moped that would lift up the front wheel off the ground and still get 230 mpg. (I leaned out the carb and modified the intake) BUT, I toasted the tranny 2 months later and burned a hole in the engine shortly after.
09-23-2006 12:42 AM
scott_s Air is a fluid. The air touching the surfaces of the walls is actually not moving. This extends out a short distance. There are layers of air where the flow is at different rates, with the center flowing the fastest. This is Lamiar flow. Fuel can fall out at the boundary layer. A rougher surface keeps the air swirling more. Something like what Mike does to the intake runners creates turbulence, which can actually increase the flow rate over that of the smooth surface. This also causes the air/fuel to mix more and better. Which is where an increase in mileage can come from.
09-23-2006 12:33 AM
Fuel atomazation............

Wouldn't an extra TB gasket help?
09-23-2006 12:10 AM
tkelly27 If I read mikes page right it provides more surface area contact for the fuel droplets to atomize in the intake track. I think it also adds turbulence?
09-22-2006 11:16 PM
kaijhe_jsziack I'm sorry, but why does making the intake ports rough improve mileage?
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