Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 5.0L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

5.0 Mustangs Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 05-19-2010   #1 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default 5.0 deck clearance questions, possible problems

At the and of last week I picked up my 5.0 HO block from the local machine shop. It was cleaned and got a fresh 4.030" bore. At the beginning of this week I installed two of the new pistons, KB116 hypers and here is the link:

KB Pistons for Automotive Applications

I became very confused when I measured the deck clearance. Well, not so much at the actual measurement, but the fact the it was different at the intake side of the piston and the exhaust side. The top of the piston on the intake side measured ~.005" below the deck, on the exhaust side it measured ~.014 below the deck! Is this normal, what should I do? Am I missing something?
I have been taking the measurements with a straight edge and a feeler gauge.

Any help is much appreciated!
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 05-19-2010   #2 (permalink)
bdbolling19 is offline Made Member

5.0L Member


Joined: Sep 2007
Posts: 1,465 Threads: 70
 bdbolling19's Country Flag  View bdbolling19's 16 photos
Port Townsend   Washington
bdbolling19 is on a distinguished road
Default

if you just had the block bored, and no other machining services performed, it would seem that the cylinders were not machined at a perfect right angle to the deck of the block.
__________________
If it's not broke, you're not trying hard enough.

1983 Mustang GT T-Top.

New T5 installed, driving my 'Stang again.
bdbolling19 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #3 (permalink)
black2002gt is offline Apprentice

5.0L Member


Joined: Nov 2005
Posts: 240 Threads: 29
 black2002gt's Country Flag  View black2002gt's 2 photos
near st louis   Illinois
black2002gt is on a distinguished road
Default

Quote:
Originally Posted by YLDPONY View Post
At the and of last week I picked up my 5.0 HO block from the local machine shop. It was cleaned and got a fresh 4.030" bore. At the beginning of this week I installed two of the new pistons, KB116 hypers and here is the link:

KB Pistons for Automotive Applications

I became very confused when I measured the deck clearance. Well, not so much at the actual measurement, but the fact the it was different at the intake side of the piston and the exhaust side. The top of the piston on the intake side measured ~.005" below the deck, on the exhaust side it measured ~.014 below the deck! Is this normal, what should I do? Am I missing something?
I have been taking the measurements with a straight edge and a feeler gauge.


Any help is much appreciated!
Wow somthing is not right. sounds like the machine shop did somthing wrong
black2002gt is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #4 (permalink)
spdjnky_42 is offline Top Dog

5.0L Member


Joined: Nov 2007
Posts: 13,639 Threads: 204
 spdjnky_42's Country Flag  View spdjnky_42's 21 photos
St.Louis   Missouri
spdjnky_42 is on a distinguished road
Send a message via Yahoo to spdjnky_42
Default

Man if you can send those hypers back then do it.
spdjnky_42 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #5 (permalink)
cindys_sn95 is offline Banned


Joined: Nov 2007
Posts: 7,991 Threads: 25
 cindys_sn95's Country Flag  View cindys_sn95's 7 photos
Gulfport   Mississippi
cindys_sn95 is on a distinguished road
Default

you need to have it paralell? decked. that will square the top of the block to crank center line.
cindys_sn95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #6 (permalink)
bob_90yj is offline Rookie

5.0L Member


Joined: Mar 2010
Posts: 6 Threads: 0
 bob_90yj's Country Flag
Leesville   Louisiana
bob_90yj is on a distinguished road
Default

BLOCK WORK 101
anytime you are having block work done, you should alignhone the mains, DECK the block 0 deck for better comp. bore and hone with plates, bore off the thrust/true bore to get proper alignment of cylinders to crank. there should be no gap going parallel to the wrist pin, side to side there may be a little gap, but VERY LITTLE that is why decking is also refered to as squaring the block. This is just my opinion.
__________________
86 lx 306 ported bigvalve e7te's 1.72 rr custom split lift split duration unltradyne pro-m 70mm t-body mac flowpath block was alignhoned bored off the thrust, lifter journals bored and bronzed cobra intake t-5 4:30's about 11.5:1 comp true flat top forged pistons. DAILY DRIVER

1994 GT 2 engines in the works 1st mild 302 gt40p top half good block work mild cam. 2nd 377 or 383 stroker have to make a choice soon, it will be blown or juiced yeet another choice.
bob_90yj is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #7 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Thanks for all the advice guys.
Last night I was trying to figure something out, and it hit me why I was getting different measurements on the two sides: Piston rock. The pistons were fit fairly tightly (by the machine shop), .0025"-.003" but they still have a little rock. Now that I realized this I measured the deck clearance parallel to the wrist pin and the pistons sit between .008" and .012" below the deck, too much from what I understand.

So here is my tentative plan:
I have the 4 corner pistons installed (1, 4, 5 and 8). I was going to haul it back to the machine shop and tell him I want it decked to as close to 0.000" deck clearance clearance as possible. Does this sound like a plan?
Oh, and I have Fel Pro .039" head gaskets, is 0" deck fine with these?

Thanks again for all the help!
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-20-2010   #8 (permalink)
cindys_sn95 is offline Banned


Joined: Nov 2007
Posts: 7,991 Threads: 25
 cindys_sn95's Country Flag  View cindys_sn95's 7 photos
Gulfport   Mississippi
cindys_sn95 is on a distinguished road
Default

with a .039 gasket, .000 deck would be about as perfect as you can get!
cindys_sn95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 05-23-2010   #9 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Okay, I took the block up to my machine shop yesterday. I had the four corner pistons installed. I told him that I wanted zero deck clearance, it would be okay if a couple of slugs peeked over the deck as much as .002 but I wanted none below.
So they will measure it, disassemble what's there and machine the deck

I really need to post some pictures of this project on here...
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-10-2010   #10 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Maybe I should start another thread to get input on this, but I will try it here first.

As I planned I had the block decked to 0.000" deck clearance. A couple of pistons sit a couple thousandths below the deck now, but they're close

Now for my next question/possible problem:
I have all the pistons installed right now and the rings seem to have quite a bit of friction on the fresh bores. I used the pre-gapped rings but also had my machine shop make sure they were correct. They opened up the top ring up a little bit to achieve .028" end gap. I also had them fit the pistons when the block was bored.
So here's my question: With all the pistons in place it takes ~30lb/ft of torque to turn the crank. Is this too much? Before the pistons were installed the crank turned feather-smooth, so I know it's not that. I coated the bores with a light coat of 30W oil before installing the pistons.
So should I be concerned, or is this an acceptable resistance? I am using Hastings plasma-moly lings by they way.

Any input is much appreciated!
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-10-2010   #11 (permalink)
89coupe is online now SHELBY GT 350 Member

5.0L Member


Joined: Nov 2008
Posts: 5,212 Threads: 6
 89coupe's Country Flag
Cartersville   Georgia
89coupe is on a distinguished road
Default

About 24-25 lbs is the norm. But depends on a few factors. Ring tension being one of them. I wouldnt be too concerned with 30lbs.
__________________
89 Coupe
347 in progress
89coupe is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-10-2010   #12 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Thanks much, that is good news indeed. I thought maybe a light coat of 30W wasn't enough so I added another thick coat. I thought I'd let it sit a few days like this and measure the required torque to turn the assembly in a few days, maybe it will be reduced with some added lubrication.

Quote:
Originally Posted by YLDPONY View Post
With all the pistons in place it takes ~30lb/ft of torque to turn the crank.
Edit: ~30(lb)(ft)

I have no idea how I made that mistake
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-10-2010   #13 (permalink)
need4spd90 is offline SHELBY GT 350 Member

5.0L Member


Joined: Apr 2009
Posts: 6,331 Threads: 44
 need4spd90's Country Flag
Mountain Top   Pennsylvania
need4spd90 is on a distinguished road
Default

glad to hear you got it straightened out
__________________
1987 Notchback - N/A stock 302, TFS heads, Holley Systemax, FTI cam, Astro A5
Best so far: 10.92 @ 123mph with a 1.49 60ft
need4spd90 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-10-2010   #14 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,724 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Quote:
Originally Posted by need4spd90 View Post
glad to hear you got it straightened out
Edit:
Got one problem straightened out

But thank you, I enjoy seeing these things get done right instead of just thrown together.
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 06-11-2010   #15 (permalink)
need4spd90 is offline SHELBY GT 350 Member

5.0L Member


Joined: Apr 2009
Posts: 6,331 Threads: 44
 need4spd90's Country Flag
Mountain Top   Pennsylvania
need4spd90 is on a distinguished road
Default

well hopefully there will be no more surprises lol
__________________
1987 Notchback - N/A stock 302, TFS heads, Holley Systemax, FTI cam, Astro A5
Best so far: 10.92 @ 123mph with a 1.49 60ft
need4spd90 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162