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  #16 (permalink)  
Old 07-13-2015, 08:16 AM
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Quote:
Originally Posted by Husein-p View Post
So no need to close this port ...
one question : why this intake manifold havent this port :
http://static.summitracing.com/globa...e/edl-7516.jpg
and this
http://static.summitracing.com/globa...DL-2601_xl.jpg

this is good to use this operating rpm range : 1,500-6,500 and secondary 1500-5500 !!!
but havent those port !
and high rpm manifolds havent this port like these :
http://static.summitracing.com/globa...edl-2814_w.jpg
http://static.summitracing.com/globa...2825_HX_xl.jpg
Those are all air-gap intakes. Designed to keep the fuel vapor cool for max power. Just like you want to do. Just what you want if you're at the strip, wide open.
Your stock intake had a crossover port to help in the everyday/anyday hot or cold weather of your stock motor.
THose air gap intakes work great on the drag strip but can be fun to tune for everyday driving.

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  #17 (permalink)  
Old 07-13-2015, 08:45 AM
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Quote:
Originally Posted by RWENUTS View Post
Those are all air-gap intakes. Designed to keep the fuel vapor cool for max power. Just like you want to do. Just what you want if you're at the strip, wide open.
Your stock intake had a crossover port to help in the everyday/anyday hot or cold weather of your stock motor.
THose air gap intakes work great on the drag strip but can be fun to tune for everyday driving.
In anyway , this port must remain open for every day usage with gm manifold if i closed this then my engine just good for high temp like 15 to up C
is this true ?
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Old 07-13-2015, 09:33 AM
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Open or closed, it makes no difference in your set up because you have headers. You have no valve on one exhaust to divert the hot gases thru there. Just remember that when the temp drops, your intake will stay cold for awhile until your motor fully warms up. Hot air rises. The heat for your intake will come from the lifter valley area. It will take longer to heat the intake. Not a problem if you're aware of it.
I've run headers in a cold climate for 50 years. Come cooler weather I always watch and listen for the tell tale signs of a cold intake.
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Old 07-13-2015, 02:02 PM
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Quote:
Originally Posted by RWENUTS View Post
Just remember that when the temp drops, your intake will stay cold for awhile until your motor fully warms up. Hot air rises. The heat for your intake will come from the lifter valley area. It will take longer to heat the intake. Not a problem if you're aware of it.
in ur opinion what hotter oil in lifter valley area ( About 150~200 Degrees C) or exhaust gas ( About 2500 Degrees C ) ?
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  #20 (permalink)  
Old 07-13-2015, 03:32 PM
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Quote:
Originally Posted by Husein-p View Post
in ur opinion what hotter oil in lifter valley area ( About 150~200 Degrees C) or exhaust gas ( About 2500 Degrees C ) ?
Well, duh!!
You answered your own question.
And it's not just the oil that's hot under the intake, it's the air too!
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Old 07-13-2015, 07:29 PM
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preheat fuel

Quote:
Originally Posted by Husein-p View Post
hot engine not hot intake manifold !
many high mpg experiments involved preheating the fuel for better mileage so yes,warm fuel too,mixed correctly with air
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Old 07-14-2015, 02:30 AM
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Quote:
Originally Posted by RWENUTS View Post
Well, duh!!
You answered your own question.
And it's not just the oil that's hot under the intake, it's the air too!
well, we will close the crossover port now heating 2500c Does not exist !! just oil heating remains !

Quote:
Just remember that when the temp drops, your intake will stay cold for awhile until your motor fully warms up
now we havent very hot intake just we have a warm intake not hot !!!

so closing this port makes change to cooling air/fuel coming to engine .
Quote:
it's the air too
air temp about 200c not more ! so is low is not important

Quote:
many high mpg experiments involved preheating the fuel for better mileage so yes,warm fuel too,mixed correctly with air
cool fuel with cool air mixed easy but in warm and hotting mode no where are your Source ?

Last edited by Husein-p; 07-14-2015 at 02:37 AM.
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  #23 (permalink)  
Old 07-14-2015, 06:20 AM
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wow ! please read this topic :
https://answers.yahoo.com/question/i...8205444AAi8FQ5
Quote:
Ok, everyone seems to have a different theory, even automotive engineers disagree on this subject. Here is the results of our own tests performed on the racetrack and dyno shop.
On a carburated engine, cold air lowered the horsepower and torque significantly when we used a freon system to take the intake air to below 75 degrees F. The colder we went the worse it got. We figured since the cold air holds more oxygen, it would increase performance, but the opposite happened. Why? After much testing we decided that the gasoline from the carburator was too cold to vaporize properly, thus expelling unburned gas out the tailpipe and wasting energy. By using hot water to heat the manifold, the performance increased greatly. Then we worked on a fuel injected engine, and found that the cold air had a similar effect, but to a lesser degree, untill we decided to heat the fuel before injecting it. Performance increased drastically with cold air and hot fuel, but after 3 catastrophic engine explosions, we also scrapped that idea as unsafe. I know a lot of engineers will dissagree with this, but it was documented over three years of trial and error testing.
its fun ! hot fuel with cold air have better performance but cold air/fuel is bad for burning ! so crossover port is important but cold air have to remain and suck in the intake manifold .
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Old 07-14-2015, 06:29 AM
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Helped a guy with that same thing 35 years ago on a 283.
We heated the fuel/air up to the point of the motor leaning out and coming apart.
But up to that limit, boy did it make some horsepower.
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Old 08-21-2015, 02:44 PM
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finally :
http://img.overpic.net/images/5/3/l/...h9ppkut8ts.jpg
http://img.overpic.net/images/a/3/3/...6419l262mu.jpg
OVERPIC.net ยป Image Hosting

but Exhaust port stay...
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  #26 (permalink)  
Old 08-21-2015, 11:10 PM
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That does not look efficient to me,,,
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Old 08-22-2015, 01:14 AM
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That does not look efficient to me,,,
Various Comments
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  #28 (permalink)  
Old 08-22-2015, 08:28 AM
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You or someone did a lot of grinding on that intake!
Why??
And an adaptor like that restricts flow too.
Just get the right intake.
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  #29 (permalink)  
Old 08-22-2015, 02:53 PM
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Quote:
Originally Posted by RWENUTS View Post
You or someone did a lot of grinding on that intake!
Why??
And an adaptor like that restricts flow too.
Just get the right intake.
i use Grinding Stone for cut these because Metal lathe cut machine cost is expensive and i use GS because is free !!!
my goal was cut those edge and i Reached to my goal !
those edge is molesting for Fueling and i removed !

for buying new intake manifold i have to spent money ! but this is free
i live in iran and iran is boycott and for importing intake from usa i must pay a high price !! but isnt important but carb is important and i imported this in ago

Last edited by Husein-p; 08-22-2015 at 03:00 PM.
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