Re: importance of and improving power curve
Posted: Mon Sep 03, 2018 11:47 am
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You see them some on pulling trucks. Pro stock trucks is where I've seen them so far.
When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.randy331 wrote: ↑Mon Sep 03, 2018 12:02 pmYou see them some on pulling trucks. Pro stock trucks is where I've seen them so far.
A 4-2-1 header may be easier to fit in the chassis. There ain't much room on the drivers side to fit them. Driveshaft and driveshaft loops a differential etc.
A 4-2-1 may help the power curve and the power curve seems important in pulling trucks for sure.
Randy
Could you spec me a try Y ? I want more TQ at peak TQ more HP at peak HP and more power above peak HP.77cruiser wrote: ↑Mon Sep 03, 2018 12:19 pm When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.
http://www.speedtalk.com/forum/viewtopic.php?t=41836
No I'm a old rookie, I bet you have an idea of what you need. Pipemax would be a start.randy331 wrote: ↑Sat Sep 08, 2018 10:24 amCould you spec me a try Y ? I want more TQ at peak TQ more HP at peak HP and more power above peak HP.77cruiser wrote: ↑Mon Sep 03, 2018 12:19 pm When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.
http://www.speedtalk.com/forum/viewtopic.php?t=41836
In other words I want more power from 5000 rpm up to 9800 rpm.
Can you spec me that header ?? LOL
Randy
I would try and move the peaks up. If it runs up there, I would try and get the peak closer to where it runs. Pulling isn't my thing, but I still build a fair number of engines or do heads for them, and evertiime we moved the peaks up, it pulled better.randy331 wrote: ↑Sat Sep 08, 2018 10:24 amCould you spec me a try Y ? I want more TQ at peak TQ more HP at peak HP and more power above peak HP.77cruiser wrote: ↑Mon Sep 03, 2018 12:19 pm loo
When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.
http://www.speedtalk.com/forum/viewtopic.php?t=41836
In other words I want more power from 5000 rpm up to 9800 rpm.
Can you spec me that header ?? LOL
Randy
Dyno, and change primary lengths, collector lengths and merge type. Slip style headers are great for tuning the curve.randy331 wrote: ↑Sat Sep 08, 2018 10:24 amCould you spec me a try Y ? I want more TQ at peak TQ more HP at peak HP and more power above peak HP.77cruiser wrote: ↑Mon Sep 03, 2018 12:19 pm When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.
http://www.speedtalk.com/forum/viewtopic.php?t=41836
In other words I want more power from 5000 rpm up to 9800 rpm.
Can you spec me that header ?? LOL
Randy
I'd like to raise the peaks some, but I've seen the engine as high as 9600 and as low as 5200 during full throttle pulling.Frankshaft wrote: ↑Sat Sep 08, 2018 11:18 amI would try and move the peaks up. If it runs up there, I would try and get the peak closer to where it runs. Pulling isn't my thing, but I still build a fair number of engines or do heads for them, and evertiime we moved the peaks up, it pulled better.randy331 wrote: ↑Sat Sep 08, 2018 10:24 amCould you spec me a try Y ? I want more TQ at peak TQ more HP at peak HP and more power above peak HP.77cruiser wrote: ↑Mon Sep 03, 2018 12:19 pm loo
When I built my 4-2-1's they weren't too bad to build, a lot easier than 4-1. Calvin Elston told me way easier & less tubing plus easier fit. First time I ever tried anything like that.
http://www.speedtalk.com/forum/viewtopic.php?t=41836
In other words I want more power from 5000 rpm up to 9800 rpm.
Can you spec me that header ?? LOL
Randy
What do you think about trying more lift? That could possibly be better everywhere in that rpm range....randy331 wrote: ↑Sun Sep 09, 2018 4:19 pmI'd like to raise the peaks some, but I've seen the engine as high as 9600 and as low as 5200 during full throttle pulling.Frankshaft wrote: ↑Sat Sep 08, 2018 11:18 amI would try and move the peaks up. If it runs up there, I would try and get the peak closer to where it runs. Pulling isn't my thing, but I still build a fair number of engines or do heads for them, and evertiime we moved the peaks up, it pulled better.
If you can keep the truck hooked up at the end of the pull, TQ around peak TQ seems to help too.
With the ones I have info on, seems once they get below peak TQ rpm, it's lights out in a hurry.
I have a few things I'm planning on doing to try and raise the peaks.
Be nice to have it better everywhere.
Randy
How about a 30 degree radius intake seat? For big low lift flowz. And some major port bias? I think that would crank the port energy thru the roof.