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Reefmoto

  • Karma: +0/-0
What would be better for my 468
« on: March 13, 2016, 03:57:21 PM »
Going to be N/A, my buddy offered my some nickson headers but I have these barr marine

Here are the nickson



Thoughts?
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GT Jets

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Re: What would be better for my 468
« Reply #1 on: March 13, 2016, 04:17:26 PM »
Life is always better at a Barr...

Knowhatamean?

Those Nicksons might as well be a two barrel carburetor.
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

mash on it

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Re: What would be better for my 468
« Reply #2 on: March 13, 2016, 04:30:44 PM »
Quote from: GT Jets on March 13, 2016, 04:17:26 PM
Life is always better at a Barr...

Knowhatamean?

Those Nicksons might as well be a two barrel carburetor.

Are the Nicsons Really that bad?

Dan'l
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Reefmoto

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Re: What would be better for my 468
« Reply #3 on: March 13, 2016, 04:53:21 PM »
Quote from: GT Jets on March 13, 2016, 04:17:26 PM
Life is always better at a Barr...

Knowhatamean?

Those Nicksons might as well be a two barrel carburetor.

God I love the Barr!
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GT Jets

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Re: What would be better for my 468
« Reply #4 on: March 13, 2016, 05:19:22 PM »
Quote from: mash on it on March 13, 2016, 04:30:44 PM
Are the Nicsons Really that bad?

Dan'l

Maybe overstated it a little,  but those Barr center risers will outflow the living hell out of those logs.

GT
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Karma: +192/-0
Re: What would be better for my 468
« Reply #5 on: March 13, 2016, 05:19:45 PM »
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

vwagon13

  • Karma: +16/-0
Re: What would be better for my 468
« Reply #6 on: March 14, 2016, 02:42:36 AM »
Center exhaust can be different and look niiice.
Are you thinking thru transom or "over the top"?
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el mojado

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Re: What would be better for my 468
« Reply #7 on: March 14, 2016, 01:50:05 PM »
Related to this topic...i think; is there a way to plumb the water so that it still goes into the manifolds but not out of the exhaust pipe? Does that make sense? Any performance to be gained. I have similar exhaust : MerCruiser center rise aluminum manifolds.I currently have stainless pipe coming out of the top with water plumbed into the pipes.
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Reefmoto

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Re: What would be better for my 468
« Reply #8 on: March 14, 2016, 08:24:53 PM »
Quote from: vwagon13 on March 14, 2016, 02:42:36 AM
Center exhaust can be different and look niiice.
Are you thinking thru transom or "over the top"?

I'm thru transom, I have a cover over the engine
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GT Jets

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Re: What would be better for my 468
« Reply #9 on: March 14, 2016, 08:45:49 PM »
Quote from: el mojado on March 14, 2016, 01:50:05 PM
Related to this topic...i think; is there a way to plumb the water so that it still goes into the manifolds but not out of the exhaust pipe? Does that make sense? Any performance to be gained. I have similar exhaust : MerCruiser center rise aluminum manifolds.I currently have stainless pipe coming out of the top with water plumbed into the pipes.

Unless you have "dry" pipes you literally have to run water through the outlets.

I'm sure I am missing something in the question.

No going with yes,  but why?

GT

Sent from my SCH-I545 using SoCal Jet Boats mobile app

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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Reefmoto

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Re: What would be better for my 468
« Reply #10 on: March 14, 2016, 09:51:06 PM »



Where do I find replacement flaps for these tips? I think they are corsa??? About 3-3/4" inside id
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vwagon13

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Re: What would be better for my 468
« Reply #11 on: March 15, 2016, 01:08:54 AM »
CP,Hardin Marine. Different sizes. Slip in from in side,exhaust hose holds them in place. Pricey,but pretty cool.
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Reefmoto

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Re: What would be better for my 468
« Reply #12 on: March 15, 2016, 08:09:19 AM »
Quote from: vwagon13 on March 15, 2016, 01:08:54 AM
CP,Hardin Marine. Different sizes. Slip in from in side,exhaust hose holds them in place. Pricey,but pretty cool.

http://www.cpperformance.com/p-12576-4-internal-butterfly-style-rubber-replacement-exhaust-flapper.aspx
4" Internal Butterfly Style Rubber Replacement Exhaust Flapper

either 3.5" or 4" do those look right?
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JordanDangerfield

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Re: What would be better for my 468
« Reply #13 on: March 15, 2016, 08:51:32 AM »

Quote from: Reefmoto on March 15, 2016, 08:09:19 AM
http://www.cpperformance.com/p-12576-4-internal-butterfly-style-rubber-replacement-exhaust-flapper.aspx
4" Internal Butterfly Style Rubber Replacement Exhaust Flapper

either 3.5" or 4" do those look right?

That's what you need. IMCO makes them as well.


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el mojado

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Re: What would be better for my 468
« Reply #14 on: March 15, 2016, 08:59:51 AM »
Quote from: GT Jets on March 14, 2016, 08:45:49 PM
Unless you have "dry" pipes you literally have to run water through the outlets.

I'm sure I am missing something in the question.

No going with yes,  but why?

GT

Sent from my SCH-I545 using SoCal Jet Boats mobile app

Was thinking that by not routing water through exit pipe it might be louder and free up a little HP. I have two hoses coming from the top of manifolds dumping into exit pipes. Was thinking about just having those dump over the boat through an outlet fitting.... just thinking out loud. School me.
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vwagon13

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Re: What would be better for my 468
« Reply #15 on: March 15, 2016, 10:39:00 AM »
Yeah, agree w/"JordanD" . Those work. I was thinking 28195 (?)would work,but only in 4in.

Weather's beautiful uphere, but 80° Thursday an Friday!  Lov'n it!
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GT Jets

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Re: What would be better for my 468
« Reply #16 on: March 15, 2016, 12:12:17 PM »
Quote from: el mojado on March 15, 2016, 08:59:51 AM
Was thinking that by not routing water through exit pipe it might be louder and free up a little HP. I have two hoses coming from the top of manifolds dumping into exit pipes. Was thinking about just having those dump over the boat through an outlet fitting.... just thinking out loud. School me.

Do those pipes go through the transom,  or over transom.

The biggest problem is the temperature at the collector.

As for the HP, I'm thinking the 5hp isn't worth the loss of hearing and burnt skin. Lol

GT

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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

el mojado

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Re: What would be better for my 468
« Reply #17 on: March 15, 2016, 12:13:12 PM »
Through transom
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GT Jets

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Re: What would be better for my 468
« Reply #18 on: March 15, 2016, 12:18:15 PM »
Quote from: el mojado on March 15, 2016, 12:13:12 PM
Through transom

So how are you going to keep from burning up the exhaust hoses and the transom?

Dry exhaust runs in excess of 600°F.

Don't do it.

JMO
GT

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« Last Edit: March 15, 2016, 12:25:05 PM by GT Jets »
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

el mojado

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Re: What would be better for my 468
« Reply #19 on: March 15, 2016, 12:18:46 PM »
Thank you
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Reefmoto

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Re: What would be better for my 468
« Reply #20 on: March 15, 2016, 07:22:19 PM »
Thanks for the info, I'm going to order the 4" even though it's not quite 4"
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