4.6 Bosch cam, search anxiety

[D Chapman]

So tell me if you port a head and make it flow better but don't add fuel for all that new massive super air flow coming into the engine or enhance the valve timing what are you really gaining? It is also true that slapping a really heavily worked set of heads on a small engine with a small cam that you're not changing the tune on will make it run like shit. You guys act like you know so much, yet can't understand a comment that deals with something that is actually very basic... Whats so hard to understand about that?

Lmao.

 

[My6speedz]

Google how a closed loop mass air flow efi system works. It was probably in the January 92 issue of super chevy if your jitterbug won't do google.

LMAO this is funny. So you think those narrow band 02 are going to adjust and make all the difference in the world if you make major changes to the cam and cylinder head?

Since you seem to think you know so much about EFI i'm sure you know that narrow bands on read out to 1 point at most in either direction and only edit the closed loop fuel tables to try and obtain stoichiometry when cruising right? When you are accelerating or WOT the PCM doesn't even use the factory o2s. The truck is open loop at that point, reading the base VE and fuel tables. It compensates for weather temp and humidity off the MASS, MAP, and IAT sensors and works out the fueling using the base map and acceleration enhancement table and applying those values to whatever timing values are in your IAT modifier tables for any correction in timing that is needed.

I think you are the one that needs to do a bit of reading up on the subject.

 

[My6speedz]

Lmao.

Nice way to get out having to respond

 

[D Chapman]

Funny how you make all this stuff up and try to act like you know what you're talking about, yet people are running ported and polished heads and cams without these issues you speak about. Funny how that works.

 

[My6speedz]

Just because an engine runs doesn't mean its optimized

Ya'll are the ones that think a cam can magically gain compression from adding a dished piston LMAO.

 

[D Chapman]

I think the proof is in the pudding.

 

[robertf]

I think you are the one that needs to do a bit of reading up on the subject.

maf with a ve table? i guess i do have to find that superchevy you are quoting and brush up

 

[My6speedz]

maf with a ve table? i guess i do have to find that superchevy you are quoting and brush up

I guess you really should...atriot:

 

[D Chapman]

My motor ran like shit.

<iframe width="420" height="315" src="https://www.youtube.com/embed/ERcPblZ6REc" frameborder="0" allowfullscreen></iframe>​

 

[My6speedz]

*sigh* but that is also a D1

 

[FB111]

Yes a D1 with an even older injection system. We're talking about a mild cam, increased low end and mid range, and a mild port job with standard size valves. Hardly pushing the envelop.

 

[My6speedz]

Yes a D1 with an even older injection system. We're talking about a mild cam, increased low end and mid range, and a mild port job with standard size valves. Hardly pushing the envelop.

Yes and that is entirely different. There is a difference between just cleaning up a port and unlocking a couple horsepower, and reworking them entirely where the cams we are talking about wouldn't even make use of them properly.

A nice valve job can net you some power if the person really knows what they are doing and these small cams we are talking about wont require anything drastic. Hell you don't even need to change the valve springs if you don't want to. The lobes are mild enough that they can control the valve.

 

[jymmiejamz]

I would recommend switching to pneumatic valves so you can eliminate the cam shaft all together. It should make the engine 30% more powerful, 30% smaller, and increase fuel economy by 30%.

 

[discostew]

id love for you to explain how advancing or retarding the 229 profile is of any benefit to a rover.

I think it would get rid of some of the overlap they use to get exhaust gasses back into the cylinder . Like the EGR valve would be doing if there was one . I can see how that would make more power .

 

[rovercanus]

So I called D&D today and no one answered the phone. Sent an email and waiting for their response.

 

[rovercanus]

Mark called me back and I'm set with internals.
Need to get with Will for everything else.

 

[D Chapman]

With his accent, don't you just want to reach through the phone and punch him in the face?

 

[ukoffroad]

not only do they make that separate kit, but you can order it from jegs or summit. i chose summit for the set i ordered because i like their please dont touch stickers

Mark called me back and I'm set with internals.
Need to get with Will for everything else.

Post up what you end up with, and your results. Curious to hear how it turns out.

 

[robertf]

already did

http://discoweb.org/forums/showthread.php?t=89827&highlight=53229

 

[rovercanus]

With his accent, don't you just want to reach through the phone and punch him in the face?

You remember we're are both married to Michiganders right? My knuckles are always sore!
He was very helpful.