Aluminum or Cast Iron Intake?

Muskratt2's picture

I'm researching the build for my upcoming 460 MPG/Torque rebuild. Here's the question I'm asking. Should I go with the stock cast iron intake or should I go with an aluminum intake? I know about the weight savings with aluminum but I also am looking at how aluminum is a heat soaker as well. So what do you'll think? I'll give you'll a little taste of what I'm doing here. This rebuild is for my 85 F350 dually that I use to haul my race car to the track.

Boring out throttle bodies

mpgmike's picture

Many of the newer throttle bodies have somewhat of a ridge.

It is believed that by boring this ridge out, thus providing a consistent 58 mm (in this case) flow would increase. I decided to put 2 throttle bodies on the flow bench to find out.

electric heater under carb, EFE (Early Fuel Evaporation)

fury fan's picture

Stumbled across an interesting item on Rockauto.com. It's basically a carb gasket for between carb and intake, and it has 2 small electric heater elements underneath the throttle bores. They come in a variety of configurations, and looks liek the OEM applications were in mid-80s GM cars.

I presume these are for heating the fuel when the engine is cold (for emissions reasons?). The spreadbore / Quadrajet style is only $40, so it's not out of reach as an experiment. Ought to give better MPG in the winter, right? How much of a 'nuisance' to wet flow is it at other times, though???

Injector placement

t120r's picture

I was doing some thinking today and wondered where I should point my injectors for my 429. I'm putting them into an Edelbrock manifold. Should I point them at the valves or no? Any ideas?

Fuel Vapor

racprops's picture

I may have placed this in the wrong thread:

Some bad news:

The Truth About Vapor Fuel
Like many others, we have heard stories of vapor systems that achieved incredible mileage. We have spent the last seven years, and a great deal of our client’s money, to determine what actual benefit, if any, there is to fuel vapor technology.

Multiple "squirts" per rev?

bobkrack's picture

My 6 cylinder Ford F-150 (4.9 liter) has 6 port injectors. The wiring diagram shows all three of injector bank one injecting at the same time and all three of the second bank at the same time (as each other, no relationship to bank one).

So, it seems to me that 3 injectors will squirt 3 times in two revolutions and the other 3 will squirt 3 times in two revolutions. Is this right? If so, it seems that some of the fuel is injected at different intervals in the intake and/or compression stroke which makes no difference to me - but if some is injected outside of that window......

Throttle blade modification

threepiston's picture

I did this to my Saturn SL1 while I had the TB out for cleaning. All I did was to carefully grind the trailing edge of each side of the throttle blade, then to radius it with the wire wheel. I only did it to 2/3 of each edge, so that the sealing portion of the blade was not affected. Do not take the sealing edge away, or you will have muchos idle RPM. It makes a huge difference on throttle input when cruising, not to mention making the engine quieter. I take it 35 mpg average out of this engine with an automatic is good....

digital egr valve info

pstrbrc's picture

OK, I'm still 'bench-racing" my high-mpg project, and now I'm looking for info on the digital egr valves that GM has been using for the last 15 years or so. I'm MegaSquirting, and I'm checking into software changes that will allow me to control a pulse width modulated egr with it, but I also have a friend who's brave enough to help me build a stand-alone control if I need it. But...
I can't find a wiring diagram of the internals of ANY digital egr, much less the ubiquitous GM unit. I also have one from an '03 Acura, so that wiring diagram would be welcome as well. Can anybody help?

Pages

Aluminum or Cast Iron Intake?

Muskratt2's picture

I'm researching the build for my upcoming 460 MPG/Torque rebuild. Here's the question I'm asking. Should I go with the stock cast iron intake or should I go with an aluminum intake? I know about the weight savings with aluminum but I also am looking at how aluminum is a heat soaker as well. So what do you'll think? I'll give you'll a little taste of what I'm doing here. This rebuild is for my 85 F350 dually that I use to haul my race car to the track.

Boring out throttle bodies

mpgmike's picture

Many of the newer throttle bodies have somewhat of a ridge.

It is believed that by boring this ridge out, thus providing a consistent 58 mm (in this case) flow would increase. I decided to put 2 throttle bodies on the flow bench to find out.

electric heater under carb, EFE (Early Fuel Evaporation)

fury fan's picture

Stumbled across an interesting item on Rockauto.com. It's basically a carb gasket for between carb and intake, and it has 2 small electric heater elements underneath the throttle bores. They come in a variety of configurations, and looks liek the OEM applications were in mid-80s GM cars.

I presume these are for heating the fuel when the engine is cold (for emissions reasons?). The spreadbore / Quadrajet style is only $40, so it's not out of reach as an experiment. Ought to give better MPG in the winter, right? How much of a 'nuisance' to wet flow is it at other times, though???

Injector placement

t120r's picture

I was doing some thinking today and wondered where I should point my injectors for my 429. I'm putting them into an Edelbrock manifold. Should I point them at the valves or no? Any ideas?

Fuel Vapor

racprops's picture

I may have placed this in the wrong thread:

Some bad news:

The Truth About Vapor Fuel
Like many others, we have heard stories of vapor systems that achieved incredible mileage. We have spent the last seven years, and a great deal of our client’s money, to determine what actual benefit, if any, there is to fuel vapor technology.

Multiple "squirts" per rev?

bobkrack's picture

My 6 cylinder Ford F-150 (4.9 liter) has 6 port injectors. The wiring diagram shows all three of injector bank one injecting at the same time and all three of the second bank at the same time (as each other, no relationship to bank one).

So, it seems to me that 3 injectors will squirt 3 times in two revolutions and the other 3 will squirt 3 times in two revolutions. Is this right? If so, it seems that some of the fuel is injected at different intervals in the intake and/or compression stroke which makes no difference to me - but if some is injected outside of that window......

Throttle blade modification

threepiston's picture

I did this to my Saturn SL1 while I had the TB out for cleaning. All I did was to carefully grind the trailing edge of each side of the throttle blade, then to radius it with the wire wheel. I only did it to 2/3 of each edge, so that the sealing portion of the blade was not affected. Do not take the sealing edge away, or you will have muchos idle RPM. It makes a huge difference on throttle input when cruising, not to mention making the engine quieter. I take it 35 mpg average out of this engine with an automatic is good....

digital egr valve info

pstrbrc's picture

OK, I'm still 'bench-racing" my high-mpg project, and now I'm looking for info on the digital egr valves that GM has been using for the last 15 years or so. I'm MegaSquirting, and I'm checking into software changes that will allow me to control a pulse width modulated egr with it, but I also have a friend who's brave enough to help me build a stand-alone control if I need it. But...
I can't find a wiring diagram of the internals of ANY digital egr, much less the ubiquitous GM unit. I also have one from an '03 Acura, so that wiring diagram would be welcome as well. Can anybody help?

No questions have been asked in this group.

No documents have been added to this group.

No wikis have been added to this group.

No polls have been added to this group.