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 Post subject: Hot intake manifold
PostPosted: Thu Mar 29, 2018 10:11 am 
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2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
Has anyone blocked heat crossing to intake? I hear a noise until the engine warms up. Why do slant 6s require such hot intake?


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Mar 29, 2018 11:55 am 
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EFI Slant 6

Joined: Thu Jun 04, 2015 6:19 pm
Posts: 317
Location: Florida
Car Model:
Yes, I did on mine, I'm also a south Fla guy, I used a SS plate to help reduce heat transfer, and incorporated an internal exhaust flow vane. I'm also port efi, so heat serves little purpose in my case.


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Mar 29, 2018 12:25 pm 
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2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
I did not put a deflector on mine, but I will make one like the stock one?


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Mar 29, 2018 3:18 pm 
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Board Sponsor
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Joined: Fri Nov 01, 2002 5:02 pm
Posts: 1813
Location: Waterloo, Iowa
Car Model: '23 T-bucket
oldtimer5151 wrote:
Why do slant 6s require such hot intake?

**********************************************************

It's for cold weather drive ability. The heat from the exhaust helps to keep the fuel in suspension in the air stream on acceleration. If one were to crack the throttle too hard while cold, the fuel can condense out of the charge and puddle on the intake plenum floor.

Roger


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Mar 29, 2018 9:11 pm 
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Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24233
Location: North America
Car Model:
It is not just for cold-weather driveability. It helps with that, yes, but intake manifold heat is beneficial no matter what the outside temperature is. See here. You hear a noise coming from the intake-to-exhaust junction? The solution is to fix it, not start disabling parts and systems because you don't quite understand them but you've decided you don't like them.

It is very much worth your while to get the good gaskets for the manifolds-to-head and intake-to-exhaust junctions.

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 Post subject: Re: Hot intake manifold
PostPosted: Mon Apr 02, 2018 7:03 pm 
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2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
Yes, I agree that a hot intake is good in cold weather. Here in Texas my intake is so hot that it will blister your hand if touched. The gas seems to boil in the carb. I made a metal gasket to Bloch off the exhaust under the carb. The stainless one had a small vane on one end. The car runs better but has a clicking noise in the exhaust until warm and quits. Evidently it was engineered to run that hot. Should I remove the block off plate and put back the original gasket? Thanks


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 Post subject: Re: Hot intake manifold
PostPosted: Tue Apr 03, 2018 5:09 am 
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Board Sponsor & Moderator
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 16447
Location: Blacksburg, VA
Car Model:
If I lived in Texas, I would leave it blocked until I saw a problem with driveability or MPG or something.

Lou

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 Post subject: Re: Hot intake manifold
PostPosted: Tue Apr 03, 2018 5:37 am 
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Turbo Slant 6

Joined: Wed Jun 13, 2012 4:39 am
Posts: 519
Location: Australia
Car Model:
In Australia which is a very similar climate to Florida it was not unusual to see slants with headers and no manifold heat whatsoever and they ran without issue. The hot box manifold heating would be vital in cold climates, but in warmer regions it’s not essential from my experience.


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 Post subject: Re: Hot intake manifold
PostPosted: Tue Apr 03, 2018 5:48 am 
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Turbo EFI
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Joined: Mon Aug 02, 2010 7:36 am
Posts: 1200
Location: Rome, GA
Car Model: 1963 Dart 270, 1980 D150
With headers and Offy intake mine runs without issue here in NW GA.

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― Hunter S. Thompson


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 Post subject: Re: Hot intake manifold
PostPosted: Wed Apr 04, 2018 10:55 am 
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2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
drgonzo wrote:
With headers and Offy intake mine runs without issue here in NW GA.
Thanks!!!


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 Post subject: Re: Hot intake manifold
PostPosted: Wed Apr 04, 2018 12:31 pm 
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Turbo EFI
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Joined: Wed Nov 23, 2011 11:07 am
Posts: 2125
Location: SF Bay Area
Car Model: 67 dart 2 door hardtop
SOunds like your problem is a leak, the clicking sound is an exhaust leak, likely seals up once hot, so it's a very narrow gap. Take Dan's advice and get a good sealing gasket. I like Remflex for this purpose, part number is 6008 i think.

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 Post subject: Re: Hot intake manifold
PostPosted: Thu Apr 05, 2018 12:27 pm 
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2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
Where can I find some?


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Apr 05, 2018 1:02 pm 
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EFI Slant 6
User avatar

Joined: Fri Sep 01, 2006 4:09 am
Posts: 396
Location: Tolland, Ct. 06084
Car Model: 65 Dart, 225, 4 spd od, hyd clutch, BBD, 2 1/4 exh
"Where can I find some?"

One way is to search on EBAY for:
6008 Remflex Exhaust Gaskets Slant 6

There are a couple of vendors on there now selling them

_________________
1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/


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 Post subject: Re: Hot intake manifold
PostPosted: Thu Apr 05, 2018 2:12 pm 
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Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24233
Location: North America
Car Model:
oldtimer5151 wrote:
Where can I find some?


They are right here.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

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 Post subject: Re: Hot intake manifold
PostPosted: Sun Apr 08, 2018 7:05 am 
Offline
2 BBL ''SuperSix''

Joined: Wed Feb 07, 2018 2:57 pm
Posts: 13
Car Model: 1963 plymouth valiant
I found it!!! Thanks!!!


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