View Poll Results: Max Timing advance for the FE446
less than 34
0
0%
36-37
0
0%
40-41
0
0%
42-43
0
0%
44-45
0
0%
Multiple Choice Poll. Voters: 8. You may not vote on this poll
Total Timing Advance
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Woohoo! Now I have the information I need!
I'll compute what the deck clearance is, based on your numbers. It would have been best if you had measured it, but this will have to do:
10.17" deck height, subtract
4.125/2 = 2.0625" crank throw, subtract
6.7" rod, subtract
1.388" compression height piston, leaves
.0195" deck clearance! We'll round it up to the nearest thousandth, so .020".
So we add your .041" head gasket and come up with .061" quench space. This is not optimal, so you'll need a little more timing.
See this article from KB.
Then read this one.
And finally this one.
Based on this, I'll err on the side of safety and vote somewhere around 38 degrees total. In reality with your quench space you may even need a little more. Next time you have the heads off, put in some .020" thick head gaskets. You'll get more compression, more power, less pinging, AND need less timing.
I'll compute what the deck clearance is, based on your numbers. It would have been best if you had measured it, but this will have to do:
10.17" deck height, subtract
4.125/2 = 2.0625" crank throw, subtract
6.7" rod, subtract
1.388" compression height piston, leaves
.0195" deck clearance! We'll round it up to the nearest thousandth, so .020".
So we add your .041" head gasket and come up with .061" quench space. This is not optimal, so you'll need a little more timing.
See this article from KB.
Then read this one.
And finally this one.
Based on this, I'll err on the side of safety and vote somewhere around 38 degrees total. In reality with your quench space you may even need a little more. Next time you have the heads off, put in some .020" thick head gaskets. You'll get more compression, more power, less pinging, AND need less timing.
Thread Starter
|
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Originally Posted by rusty70f100
Woohoo! Now I have the information I need!
I'll compute what the deck clearance is, based on your numbers. It would have been best if you had measured it, but this will have to do:
10.17" deck height, subtract
4.125/2 = 2.0625" crank throw, subtract
6.7" rod, subtract
1.388" compression height piston, leaves
.0195" deck clearance! We'll round it up to the nearest thousandth, so .020".
So we add your .041" head gasket and come up with .061" quench space. This is not optimal, so you'll need a little more timing.
See this article from KB.
Then read this one.
And finally this one.
Based on this, I'll err on the side of safety and vote somewhere around 38 degrees total. In reality with your quench space you may even need a little more. Next time you have the heads off, put in some .020" thick head gaskets. You'll get more compression, more power, less pinging, AND need less timing.
I'll compute what the deck clearance is, based on your numbers. It would have been best if you had measured it, but this will have to do:
10.17" deck height, subtract
4.125/2 = 2.0625" crank throw, subtract
6.7" rod, subtract
1.388" compression height piston, leaves
.0195" deck clearance! We'll round it up to the nearest thousandth, so .020".
So we add your .041" head gasket and come up with .061" quench space. This is not optimal, so you'll need a little more timing.
See this article from KB.
Then read this one.
And finally this one.
Based on this, I'll err on the side of safety and vote somewhere around 38 degrees total. In reality with your quench space you may even need a little more. Next time you have the heads off, put in some .020" thick head gaskets. You'll get more compression, more power, less pinging, AND need less timing.
thanks Kurt. That's all good information. can you confirm what my static CR is with that setup?
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Sure. We'll assume a few things:
1. That the Edelbrock head chambers are in fact 72cc's as advertised,
2. That you actually do have the .020" deck clearance that I calculated above,
3. That the piston dishes actually do come to 15cc's,
4. That 4.4" is the average bore diameter of the head gasket.
I'll use the calculator on KB-Silvolite.com. Very good site BTW.
With your current setup, it calculates out to 9.916:1 static compression, and 8.684:1 dynamic compression with the 521 roller cam.
If you put in the .020" thick Mr Gasket head gaskets, you'd get 10.451:1 static compression ratio, and 9.145:1 dynamic. I really think you could get away with it. With a 541 roller cam, it'd really work good...
Edit: With the 541 roller cam, you'd have 8.584:1 dynamic compression ratio with the .020" head gaskets. If you're looking for an upgrade, this is it. Cam and head gaskets...
1. That the Edelbrock head chambers are in fact 72cc's as advertised,
2. That you actually do have the .020" deck clearance that I calculated above,
3. That the piston dishes actually do come to 15cc's,
4. That 4.4" is the average bore diameter of the head gasket.
I'll use the calculator on KB-Silvolite.com. Very good site BTW.
With your current setup, it calculates out to 9.916:1 static compression, and 8.684:1 dynamic compression with the 521 roller cam.
If you put in the .020" thick Mr Gasket head gaskets, you'd get 10.451:1 static compression ratio, and 9.145:1 dynamic. I really think you could get away with it. With a 541 roller cam, it'd really work good...
Edit: With the 541 roller cam, you'd have 8.584:1 dynamic compression ratio with the .020" head gaskets. If you're looking for an upgrade, this is it. Cam and head gaskets...
Last edited by rusty70f100; Aug 9, 2005 at 07:00 PM.
Thread Starter
|
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Kurt, you've joined the ranks of Scouder and DF with the "Bigger Cam, Bigger Cam" approach.
Any idea what that does to the vacuum and idle? Remember, I'm pushing a 4600lb truck with PB, PS, AC etc.
Any idea what that does to the vacuum and idle? Remember, I'm pushing a 4600lb truck with PB, PS, AC etc.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well, you have the higher stall TC, what are you worried about? Vacuum goes down, idle RPM goes up, miles per gallon goes down. When you increase the idle RPM, vacuum goes back up. If you set the timing at idle a little higher, it helps with idle vacuum.
Thread Starter
|
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Originally Posted by strokster
That's all extremely valuable information. Now to digest, re-read and apply. Thanks for taking me back to school!!!
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