Cam "sound"
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Tuned
Joined: Jan 2004
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From: B.C.Canada, EH?
Cam "sound"
I have a question about my 460, but I think it applies to all engines. 1977 460,fuelie pistons,D3 heads, 214/224*@.050, 513/534 lift,112 C/L. cam, Performer intake, Edel 750.
Why does the cam "smooth out" as the engine warms up? It's got nothing to do with the choke, as it doesn't have one. I've noticed this on several modified engines, Ford and otherwise. The cam sounds great (nice and lumpy) when the engine is cold, or somewhat warm, but as it gets to operating temp (195*), it smooths out and idles like a stocker.
Any and all input appreciated.
Why does the cam "smooth out" as the engine warms up? It's got nothing to do with the choke, as it doesn't have one. I've noticed this on several modified engines, Ford and otherwise. The cam sounds great (nice and lumpy) when the engine is cold, or somewhat warm, but as it gets to operating temp (195*), it smooths out and idles like a stocker.
Any and all input appreciated.
Senior User
Joined: Nov 2008
Posts: 276
Likes: 0
From: Nashville NC
I have a question about my 460, but I think it applies to all engines. 1977 460,fuelie pistons,D3 heads, 214/224*@.050, 513/534 lift,112 C/L. cam, Performer intake, Edel 750.
Why does the cam "smooth out" as the engine warms up? It's got nothing to do with the choke, as it doesn't have one. I've noticed this on several modified engines, Ford and otherwise. The cam sounds great (nice and lumpy) when the engine is cold, or somewhat warm, but as it gets to operating temp (195*), it smooths out and idles like a stocker.
Any and all input appreciated.
Why does the cam "smooth out" as the engine warms up? It's got nothing to do with the choke, as it doesn't have one. I've noticed this on several modified engines, Ford and otherwise. The cam sounds great (nice and lumpy) when the engine is cold, or somewhat warm, but as it gets to operating temp (195*), it smooths out and idles like a stocker.
Any and all input appreciated.
Got a question for you though.
I see you have a 77 engine, but you have fuelie pistons in it, what or why was the reason you used those.
Just thinking, was it because the dish not as deep as the older model carb pistons & by using those it would raise the compression some. If I been reading right though, the compression height was a bit different on the later models & they sit lower in the bore, if I remember right.
Neil
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Tuned
Joined: Jan 2004
Posts: 325
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From: B.C.Canada, EH?
I put in an idea why over on 460.com, but that might not be the reason.
Got a question for you though.
I see you have a 77 engine, but you have fuelie pistons in it, what or why was the reason you used those.
Just thinking, was it because the dish not as deep as the older model carb pistons & by using those it would raise the compression some. If I been reading right though, the compression height was a bit different on the later models & they sit lower in the bore, if I remember right.
Neil
Got a question for you though.
I see you have a 77 engine, but you have fuelie pistons in it, what or why was the reason you used those.
Just thinking, was it because the dish not as deep as the older model carb pistons & by using those it would raise the compression some. If I been reading right though, the compression height was a bit different on the later models & they sit lower in the bore, if I remember right.
Neil
Here's the spec's:
1968-87 pistons - 1.760 pin height - .230 dish - cast
1988-92 pistons - 1.760 pin height - .072 dish - cast
1993-97 pistons - 1.770 pin height - .180 dish - hyper.
I'm no expert but, believe they could run a bit more comp on the later engines because of the fuel injection and computer controlled ignition advance.
Hope this helps....
Senior User
Joined: Nov 2008
Posts: 276
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From: Nashville NC
Yes sir, that help a bunch.
Humm, now if the D3 heads have 93 to 95cc chambers & if the 88 to 92 pistons with the 0.72 dish were used, wonder what the compression ratio would be.
Around 9.5:1 not to high for prem pump gas, right.
Neil
Humm, now if the D3 heads have 93 to 95cc chambers & if the 88 to 92 pistons with the 0.72 dish were used, wonder what the compression ratio would be.
Around 9.5:1 not to high for prem pump gas, right.
Neil
Thread Starter
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Tuned
Joined: Jan 2004
Posts: 325
Likes: 1
From: B.C.Canada, EH?
Good luck with your build...
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