High HP exhaust questions - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 43 (permalink) Old 08-16-2007, 12:16 AM Thread Starter
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High HP exhaust questions

Right now the 4" bend through my bed gets damn hot and I don't want to sacrifice power by a system being restricted. Modded H2E or GT42R will be going on in about 6 weeks and I want things to flow properly for the new lung.

For 550-600hp, is 4" down pipe enough?

When you turn up through the bed for stacks do you keep it 4" or up-size to 5" and then turn it up for less restriction?


Thanks,

Early99 CC LWB 4X4
Updated B codes, Modded H2E, Big oil, half filled block, studded, John Wood 4R100. 232K miles
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post #2 of 43 (permalink) Old 08-16-2007, 12:19 AM
 
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Re: High HP exhaust questions

House said he got more power by going to a single stack and one smooth elbow as opposed to duals and a restrictive splitter IIRC.

Point being, there is something to be gained in a high HP application by ensuring an open, properly sized, and the least restrictive exhaust possible.

Don't know how much testing there will be out there on 4"+ down pipes. Looks impossible to fit bigger to me without a body lift or firewall bashing, and not even sure anyone makes a bigger dp that will bolt in.

I think a 4" dp is fine, just make sure the rest of your exhaust is as open and unrestrictive as possible.

It's gonna get hot, that's hot stuff comin out of it!
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post #3 of 43 (permalink) Old 08-16-2007, 12:42 AM
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Re: High HP exhaust questions

Damn GR that was well said and even informative.

97 crew cab shorty-4x4 Lots of mods .
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post #4 of 43 (permalink) Old 08-16-2007, 01:10 AM
 
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Re: High HP exhaust questions

If the Y and elbows are mandrel bent and are properly sized they will work just fine. In real trucks going from single to dual stacks is a must if you increase HP or do an engine swap to something bigger.

4" DP is plenty big for the CFM these engines will flow. If you are worried you can go to 5" just after the DP and then all the way out to 5" stacks, but they'll still get hot.
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post #5 of 43 (permalink) Old 08-16-2007, 02:38 AM
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Re: High HP exhaust questions

Quote:
Originally Posted by strokin_early_99 View Post
For 550-600hp, is 4" down pipe enough?

Thanks,
Howard, I hope you have billet rods.
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post #6 of 43 (permalink) Old 08-16-2007, 04:03 AM Thread Starter
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Re: High HP exhaust questions

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Originally Posted by TerminatorEngineering View Post
Howard, I hope you have billet rods.
I am working on a lower unit fully built. I will be shooting for 600+ on fuel only. No spray of any kind. Right now I am looking at the future with every step I make.

To add a girdle, do I need to do any machining to the block?

Early99 CC LWB 4X4
Updated B codes, Modded H2E, Big oil, half filled block, studded, John Wood 4R100. 232K miles
Tows like a champ!

"Damn Larry, he passed us like a freight train passing a hobo!"
--Lisa P.

Just sold to Larry
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post #7 of 43 (permalink) Old 08-16-2007, 04:06 AM
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Re: High HP exhaust questions

Yup, line bore through the mains, with the girdle on.
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post #8 of 43 (permalink) Old 08-16-2007, 12:38 PM
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Re: High HP exhaust questions

Thats odd... because all of the girdles for all the gasser engines do not require a line hone... is this girdle made different... from the pictures that I have seen it just bolts on top of the main caps like all the others...
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post #9 of 43 (permalink) Old 08-16-2007, 12:40 PM
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Re: High HP exhaust questions

on another note... you can get a 6" oval pipe down through the firewall area without much modification at all... it would be a custom downpipe though... its almost 4" thick but its about 7-7.5" long on the cross section... easily flows more than 4" round
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post #10 of 43 (permalink) Old 08-16-2007, 01:57 PM
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Re: High HP exhaust questions

Quote:
Originally Posted by strokin_early_99 View Post

For 550-600hp, is 4" down pipe enough?


Thanks,

made 596/ 1200+ #2 only with a 3" downpipe, so yes a 4" will be plenty

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