Thread: head upgrade disappointment

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Originally Posted by pat mccarthy

egr very well could help with a hirer cranking psi with poor fuel

Perhaps, but I have no interest in introducing burnt gases into the system to reduce the charge density. If you must run EGR from an emissions standpoint, then fine. But if you don't, then the whole contraption is mis-engineered in the first place if you have to use EGR to make it work.

Originally Posted by techinspector1

turbo,
Hey, if you're gettin' away with it, keep gettin' away with it!
I know of no way to figure SCR from cranking pressure. You have the variable of the intake valve closing point.

There are some ways to figure it. Several have figured it fore me in a couple different ways on the 302 which came out between 11.6 to 12.5 static (truely its just short of 9.0). This engine was built to embrace everything I have learned to keep air speed up. In many builds I have done it and its like having a couple lbs of boost.

Originally Posted by techinspector1

Perhaps, but I have no interest in introducing burnt gases into the system to reduce the charge density. If you must run EGR from an emissions standpoint, then fine. But if you don't, then the whole contraption is mis-engineered in the first place if you have to use EGR to make it work.

well i do not but you posted it ? its done on new cars every day many make very good HP with it

EGR is mostly for cruse conditions to enable advances in timing similar to the old days vaccum advance units of 15 to 25*. Dosent effect performance that much. Usally its shut down aroud 75% load or more. Its also come a long way since it was introduced.

Originally Posted by turbo2256b

There are some ways to figure it. Several have figured it fore me in a couple different ways on the 302 which came out between 11.6 to 12.5 static (truely its just short of 9.0).

Yeah, those several sure nailed it. hahahahahahahaha.
Would you like to share with us how you keep mixture speed up? What motor? What components?

Originally Posted by turbo2256b

Usally its shut down aroud 75% load or more.

That's great if you have electronic engine management, but it's pretty hard to do with a carburetor. I'm not trying to argue with anyone about EGR. I just don't plan to use it on any of my builds unless it has to be there to pass emissions.

Originally Posted by techinspector1

Yeah, those several sure nailed it. hahahahahahahaha.
Would you like to share with us how you keep mixture speed up? What motor? What components?

The caculations are not all that inacurate as it nailed it on most builds. However most have less dynamic than static.

In a nut shell it has to due with selecting componets that complement each other as well as possible and or modifing them to do so.
Would need a new topic started on it.

Originally Posted by techinspector1

That's great if you have electronic engine management, but it's pretty hard to do with a carburetor. I'm not trying to argue with anyone about EGR. I just don't plan to use it on any of my builds unless it has to be there to pass emissions.

Dont plan on any carbed motor builds using EGR myself.