Pulling Forum - 426 boost pressure

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426 boost pressure

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=152368
Printed Date: 27 Sep 2024 at 3:19pm
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Topic: 426 boost pressure

Posted By: AC D21
Subject: 426 boost pressure
Date Posted: 23 Jul 2018 at 1:06pm

How much boost can a stock D21 intake manifold take.

Replies:

Posted By: DrAllis
Date Posted: 24 Jul 2018 at 7:10am

More than 50, but not 100 psi.

Posted By: NEVER green
Date Posted: 24 Jul 2018 at 8:24am

A intercooled one would take more??

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2-8050 1-7080 6080 D-19 modelE & A 7040 R50

Posted By: AC D21
Date Posted: 24 Jul 2018 at 9:57am

Thanks

Posted By: DrAllis
Date Posted: 24 Jul 2018 at 3:31pm

Intercooler will take 100 psi, yes.

Posted By: injpumpEd
Date Posted: 25 Jul 2018 at 8:11am

a customer of mine in MN with a D21 that I built a 450 roosa pump for was running 7th gear one time and it blew the stock intake apart. I sold him an intercooler manifold that was gutted. He was running an S300 turbo and they will exceed 50 psi. The load that 7th gear put on it must have sent it to over 60 psi lol! Luckily he had side shields on it. Since that time, I tend to shy away from the small manifold, and go to the intercooler manifold, even if you have to gut it.

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!

Posted By: cms
Date Posted: 31 Jul 2018 at 10:37am

We blow a stock manifold apart at 45 psi with a s-400 3x3. Running ( different turbo set up)up to 70 psi now with intercooler gutted and ice box with no problem.