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Username Post: Gasket Question        (Topic#301102)
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-12-13 10:44 AM - Post#2371680    

The gasket between the Int/Exh manifolds, silver metallic side of gasket, up or down ?

I'm guessing down.

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 


beagrizzly 
"12th Year" Gold Supporting Member
Posts: 2255
beagrizzly
Age: 71
Loc: south texas
Reg: 08-04-12
08-12-13 10:58 AM - Post#2371690    
    In response to 2D51STYDLX

the metallic side always goes toward the hottest part.

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-12-13 11:44 AM - Post#2371709    
    In response to beagrizzly

Thank you sir.


Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
whiskey1954 
"5th Year" Gold Supporting Member
Posts: 892
whiskey1954
Loc: central north carolina
Reg: 12-07-08
08-12-13 11:48 AM - Post#2371710    
    In response to beagrizzly

Beagrizzly: Not to sound like a dum-dum but which is hotter the head exhaust port or the exhaust manifold port. I have experience that both are to hot to touch in that area.



 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-12-13 02:37 PM - Post#2371779    
    In response to whiskey1954

That's the first thing that I thought of whiskey/ which is hotter ?

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



Edited by 4D50STYDLX on 08-12-13 02:38 PM. Reason for edit: No reason given.

 
whiskey1954 
"5th Year" Gold Supporting Member
Posts: 892
whiskey1954
Loc: central north carolina
Reg: 12-07-08
08-12-13 03:35 PM - Post#2371798    
    In response to 2D51STYDLX

4dor: I have always used mine with the shiny perforated toward me. Thinking that the head would always be flush or planed correctly. While on the other hand the manifold could be warped a little. Seeing the gasket is a little puffy on the shiny side. Even at that I am still curious as to which it the hotter of the 2



 
kzhurley 
Contributor
Posts: 130
kzhurley
Age: 38
Loc: Millersburg,Ohio
Reg: 01-02-12
08-12-13 05:50 PM - Post#2371840    
    In response to whiskey1954

I would think that the manifold side may be hotter due to the head side being water-cooled?

1950 Styleline Deluxe 2-door sedan..
348 tripower/NP833 4-Speed/3.73
1950 Styleline Deluxe 4-door..
Vortec 4200 I-6/4l60e/3.42/current project car
1956 Cadillac Coupe de Ville 500 efi/4l80e
1987 GMC R1500 Sierra Classic
454 tbi/700r4/3.42


 
whiskey1954 
"5th Year" Gold Supporting Member
Posts: 892
whiskey1954
Loc: central north carolina
Reg: 12-07-08
08-12-13 07:07 PM - Post#2371858    
    In response to kzhurley

kzhurley:



 
mahlmann 
"11th Year" Gold Supporting Member
Posts: 1829
mahlmann
Age: 77
Loc: Las Cruces, NM
Reg: 01-20-11
08-12-13 07:36 PM - Post#2371867    
    In response to whiskey1954

Interesting question! (Antique physicist speaking now.)

I'm betting on the cylinder head, since it's the source of the heat. The manifold is like a heat sink, which can't ever get hotter than the source. The further you get from the source, the lower the temperature is.

I put the solver side towards the head, which is what my machinist recommended.

Mike Ahlmann
Las Cruces, NM
'50 Tin Woodies (two) Ramon and Willard
'58 Impala Sport Coupe
'69 El Camino SS-396
'07 Ford F150 to haul parts for above
'16 Ford Explorer 3.5 EcoBoost - Red Rocket


 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-12-13 08:06 PM - Post#2371877    
    In response to mahlmann

Hmmmmmm, verdy intresting !

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
2blu52 
Deceased Member RIP
Posts: 19549
2blu52
Loc: Montana
Reg: 03-12-02
08-13-13 04:53 AM - Post#2371950    
    In response to mahlmann

  • mahlmann Said:
Interesting question! (Antique physicist speaking now.)

I'm betting on the cylinder head, since it's the source of the heat. The manifold is like a heat sink, which can't ever get hotter than the source. The further you get from the source, the lower the temperature is.

I put the solver side towards the head, which is what my machinist recommended.


I go with the head side as the exhaust is created there and cools as it moves out. The exhaust portion of the head is not water cooled.

"PEACE IS THAT GLORIOUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
Panama Red 
Contributor
Posts: 725
Panama Red
Age: 73
Loc: Jenison, Michigan
Reg: 08-29-10
08-13-13 10:06 AM - Post#2372044    
    In response to 2blu52

Ever seen an engine running hard on a dyno and the exhaust manifolds/headers turning cherry red? Now I've seen some Hot Red heads but never a head that turned red from the heat. I'd say the manifold is hotter.

Jon Hansen

My '41 Chevy blog

Blog #2


 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-13-13 04:33 PM - Post#2372152    
    In response to Panama Red

I would think that different metals get cherry red at different temps, which could cause that. Plus the fact that they are much thinner than the head.
Could be a valid point though ?

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
DanD1950 
Contributor
Posts: 885
DanD1950
Loc: London Ont. Canada
Reg: 10-16-11
08-14-13 05:12 AM - Post#2372274    
    In response to 2D51STYDLX

The shinny side of any exhaust manifold gasket, always goes to the exhaust manifold. On many of the after market gasket sets, it will be stamped right onto the gasket; saying "manifold side"
Why I'm not sure; but I believe it has to do with the expansion and contraction of the manifold and it not sticking to the foil side of the gasket?

Dan


50 Styleline Deluxe, 2 Door Sedan, Was a 216cu", Three Speed Manual. She now has a 4.8Lt V8 LR4 injected engine, 4L60E 4 speed automatic, 10 bolt diff 342 gear with an Eaton C80 Locker



 
kzhurley 
Contributor
Posts: 130
kzhurley
Age: 38
Loc: Millersburg,Ohio
Reg: 01-02-12
08-14-13 12:25 PM - Post#2372374    
    In response to DanD1950

This weekend I'll have to shoot the IR thermometer on my dads 235 in his 48 P/U..Since now I'm curious about it...

1950 Styleline Deluxe 2-door sedan..
348 tripower/NP833 4-Speed/3.73
1950 Styleline Deluxe 4-door..
Vortec 4200 I-6/4l60e/3.42/current project car
1956 Cadillac Coupe de Ville 500 efi/4l80e
1987 GMC R1500 Sierra Classic
454 tbi/700r4/3.42


 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
08-14-13 12:29 PM - Post#2372376    
    In response to kzhurley

Good idea, can't wait for the results.

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
NWMO 52 Chevy 
Contributor
Posts: 774
NWMO  52 Chevy
Age: 53
Loc: Northwest Missouri
Reg: 11-10-10
08-14-13 04:15 PM - Post#2372416    
    In response to 2D51STYDLX

Hey all,

Always entertaining on here. I'd be very surprised if the head is even 1/2 the temp of the exhaust manifolds (assuming some minimum run time, 10 min or more?) I've never witnessed a dyno test, but I've seen exhaust glow cherry red on tractors, small engines, etc. I've read that it's often due to poor timing and unspent fuel combusting when it hits the hot manifold, seems logical).

While the metals are different between the manifold and head, I doubt there is any signficant difference in the "melting point". The manifolds have a much smaller mass over which to spread the heat, thus they would heat up more. I know some of the manifold "paints" advertise 1400 - 2000 degree temps. While it may not be water-cooled, the head is bolted directly to an even larger chuck of metal that is kept at 200 degrees or less typically. I would expect the block to pull much of the heat from the head as well.

I just wanted to get my two cents in and alway enjoy this board.

Chris



 
dsacton 
"4th Year" Silver Supporting Member
Posts: 1356
dsacton
Loc: Boulder, CO
Reg: 11-01-11
08-14-13 07:30 PM - Post#2372478    
    In response to NWMO 52 Chevy

Good analysis. Put me down for the exhaust too.

Can't wait...




Scott Acton
1954 Chevy Bel Air 2-door
http://www.my54chevy.com


 
2D51STYDLX 
"10th Year" Silver Supporting Member
Posts: 1208
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
09-05-13 08:00 AM - Post#2379376    
    In response to kzhurley

Hey kz, did you ever do the temp check ?

I'm still curious.

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
AngieWeaver 
Contributor
Posts: 759
AngieWeaver
Loc: NorthEastern WA
Reg: 07-16-13
09-05-13 09:06 AM - Post#2379388    
    In response to NWMO 52 Chevy

I agree. I think the exhaust side would be hotter...and I also think the puffy foil side helps to cushion slight warpages on the manifold. When we raced vw...I know it is much different but still...the egt was optimally 1380...and it had an aluminum head...so you would think the head wouldn't get that hot. Not sure what the optimal egt is on these motors...but it sure don't seem like the head would get very hot. Our diesel runs about 1250 according to the banks tuner...I have a point infra red pyrometer...I could see what the head and manifold on that run...boy do I wish I could just go fire up my 51 and see what it runs...
Great discussion.

1951 Business Coupe
1957 Chevy 3100 project
1973 Camaro type LT
2003 GMC 2500 8.1L4X4
2016 3500 Silverado Duramax
2015 Corvette Z06 DSOM w/kalahari brown
2013 Caprice PPV
Mopars and a few parts cars
http://www.AmericanClassicMetalPicke rs.com


 


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