weld el manifold
#1
weld el manifold
so i have a question. i am getting ready to build a manifold that will most likely be similar to artechs design. i have a choice between two flanges that are mostly the same other than weld el size. one is 1.25 and the other is 1.5
any preference or opinion from those who have experience?
any preference or opinion from those who have experience?
#3
Retired Mech Design Engr
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1.25 works very well for log manifold. El's and Tee's need only a little material removed for it all to fit in the cylinder port spacing. I built mine El, Tee, Tee, El.
Also, 1.5 usually needs to be flattened into the oval shape of the ports. There are flanges available for the 1.25 that transition perfectly from the Oval to the 1.25 diameter.
EDIT: Oh, you're not making a log. 1.25 still makes sense to me.
Also, 1.5 usually needs to be flattened into the oval shape of the ports. There are flanges available for the 1.25 that transition perfectly from the Oval to the 1.25 diameter.
EDIT: Oh, you're not making a log. 1.25 still makes sense to me.
#4
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1.25 supposedly spools faster. Its a pain to make 2 1.25" els fit over a t3 flange though. Lots of swearing and hammering. Any more than 2 meeting at the flange would be better.
I'm assuming hes talking about a flange that transitions to the right size. It makes it way easier to fit and weld your bits.
I'm assuming hes talking about a flange that transitions to the right size. It makes it way easier to fit and weld your bits.
#6
1.25 supposedly spools faster. Its a pain to make 2 1.25" els fit over a t3 flange though. Lots of swearing and hammering. Any more than 2 meeting at the flange would be better.
I'm assuming hes talking about a flange that transitions to the right size. It makes it way easier to fit and weld your bits.
I'm assuming hes talking about a flange that transitions to the right size. It makes it way easier to fit and weld your bits.
#10
1.25 spools better and I think will make more power unless you somehow manage some magical porting on the head oversized valves and mega lift cams shooting for north of 450hp. Having the exhaust gas slow down in large diameter tubes after leaving the head then speed back up as it necks down to the to the nozzle of the turbine will cost hp over keeping the velocity more constant.
400 hp here with 1.25" sch 40 longish equal length weld el manifold.
400 hp here with 1.25" sch 40 longish equal length weld el manifold.
#11
so my goal is 300whp but i do want to keep the torque lowish for drivetrain longevity. 300/260 i think would be nice.
This is on a VVT motor and i plan to rev to 7500. part of the reason i was originally leaning to 1.5, so that it could build good top end power.
i am probably overthinking it and it wont matter much either way
This is on a VVT motor and i plan to rev to 7500. part of the reason i was originally leaning to 1.5, so that it could build good top end power.
i am probably overthinking it and it wont matter much either way
#12
so my goal is 300whp but i do want to keep the torque lowish for drivetrain longevity. 300/260 i think would be nice.
This is on a VVT motor and i plan to rev to 7500. part of the reason i was originally leaning to 1.5, so that it could build good top end power.
i am probably overthinking it and it wont matter much either way
This is on a VVT motor and i plan to rev to 7500. part of the reason i was originally leaning to 1.5, so that it could build good top end power.
i am probably overthinking it and it wont matter much either way
#15
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You buy this head flange and 1.5" schedule 40 weld welds fit on perfectly. Well you buy that flange if 1.8, they also have the 1.6 flange if you need that.
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