perf-list-digest Tuesday, September 1 1998 Volume 01 : Number 076



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Ford Truck Enthusiasts - Performance
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In this issue:

RE: FTE Perf - 144 mph Ford Truck
Re: FTE Perf - compression ratio's
Re: FTE Perf - compression ratio's
FTE Perf - Piston Clearance

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Date: Mon, 31 Aug 1998 09:59:34 -0400
From: Sleddog
Subject: RE: FTE Perf - 144 mph Ford Truck

it was a teal, ginda green blueish color. rollbar, big meats in back.
looked more for drag racing than top speed runs. on TV they didn't show
any exotics, closest thing was a viper. almost every car was a vette,
stang, honda, datsun Z, etc. a few muscle cars, and a few trucks. a few
big rigs too. wild seeing a rig run over 130 mph on the straights.

sleddog

ps-that race was called the pony express 100 i think.

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From: J.S.H.[SMTP:F428 ford-trucks.com]
Sent: Monday, August 31, 1998 5:07 AM
To: perf-list ford-trucks.com
Subject: FTE Perf - 144 mph Ford Truck

I believe I saw this truck in person a while back. It was a yellow 50?
w/a full roll cage.
It looks like a typical nice lowered street truck except for the cage
and Silver State Classic
stickers on it.A real nice truck and I bet it really stands out in the
pits w/ all the Ferarris etc.

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Date: Mon, 31 Aug 1998 11:38:13 +0000
From: "Gary, 78 BBB"
Subject: Re: FTE Perf - compression ratio's

From: "Dale and Donna Carmine"
Subject: FTE Perf - compression ratio's
Date sent: Thu, 27 Aug 1998 17:50:20 -0500

> thought that you had to keep the piston below the deck or it would smack
> the head. What is the minimum acceptable piston/head clearance assuming
> stock rods and a reasonable (6K) rpm limit??

The closer you make this spec to zero the more care you need to take with
such minor details as rod, center to center length variance between rods,
piston compression height varience and deck relationship to main bearing
bores from one end to the other etc.. If you have no accurate way to
measure these parameters then 0.020" is too little IMHO but if you do and
they can be adjusted to match within 0.001" or so then you can bring them
right together as Sleddog suggested but only if you can match these
dimensions.

78 F-150, 2wd, 460, C-6, 235's "The Ex-Black Hole"
78 Bronco 351M, Np 435, Np 205, 33's "The Black Hole"
78 LIncoln Continental, 460, C-6, 19.5' long! "The Future.." :-)
9000#, in ground vehicle lift, Woooo Hoooo!

- -- Gary --
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Date: Mon, 31 Aug 1998 19:32:47 -0700
From: "George"
Subject: Re: FTE Perf - compression ratio's

You're talkin' Bad Boy tolerances. What heat expansion allowance is included
in an aluminum to steel clearance of .0.001"? That has to be an interesting
number.

George Miller


> thought that you had to keep the piston below the deck or it would smack
> the head. What is the minimum acceptable piston/head clearance assuming
> stock rods and a reasonable (6K) rpm limit??

The closer you make this spec to zero the more care you need to take with
such minor details as rod, center to center length variance between rods,
piston compression height varience and deck relationship to main bearing
bores from one end to the other etc.. If you have no accurate way to
measure these parameters then 0.020" is too little IMHO but if you do and
they can be adjusted to match within 0.001" or so then you can bring them
right together as Sleddog suggested but only if you can match these
dimensions.

78 F-150, 2wd, 460, C-6, 235's "The Ex-Black Hole"
78 Bronco 351M, Np 435, Np 205, 33's "The Black Hole"
78 LIncoln Continental, 460, C-6, 19.5' long! "The Future.." :-)
9000#, in ground vehicle lift, Woooo Hoooo!

- -- Gary --
== FTE: Uns*bscribe and posting info www.ford-trucks.com/faq.html


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Date: Mon, 31 Aug 1998 21:53:39 -0500
From: "wild.bunch"
Subject: FTE Perf - Piston Clearance

Y-Block guys tell me to set the deck height to 0 (zero) and use a Fel-Pro
Perma-Torque gasket for about .035" clearance. The Y head has lots of quench
and you need a tight clearnace to make it work. This is what I'm getting
ready to do with my block.

I recall that the first Iron Duke 4 cyl in the ch*v Citation were set up
with about .030 clearance, and when they got a few miles on them and
carboned up, there was a knock. This caused some service troubles.
Supposedly, between .040 to .060 is the gray zone, and outside of .060 the
quench doesn't work too good, like on the open chamber Mopar 440 heads, 68
and after. You wnat that quench to work because it will lower the octane
requirement for a given ratio

Aluminum would certainly be a factor due to the greater expansion of this
metal.

High RPM would figure: the greater the RPM, the greater the rod stretch.

Finally, since motors usually blow during the overlap period when the rod
bolts are under stress to stop the mass of the piston and there is no
"cushion" pushing back, like on the compression/firing cycles, I think that
long rod motors will be able to run a little closer clearance, due to the
fact the the deacceleration/acceleration of the piston at TDC is more gentle
for a long rod than a short one. I don't have an idea how much to allow for
on this point, tho.

tim

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End of perf-list-digest V1 #76
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