perf-list-digest Saturday, December 12 1998 Volume 01 : Number 169



=======================================================================
Ford Truck Enthusiasts - Performance
Visit our web site: http://www.ford-trucks.com/
- - - - - - - - - - - - - - - - - - - - - - -
To unsubscribe, send email to:
majordomo ford-trucks.com
with the words "unsubscribe perf-list-digest" in the body of the
message.
=======================================================================
In this issue:

RE: FTE Perf - Long rods and more.
FTE Perf - C/R
RE: FTE Perf - C/R
FTE Perf - C6
RE: FTE Perf - C6

=======================================================================

----------------------------------------------------------------------

Date: Fri, 11 Dec 1998 10:31:15 -0500
From: Sleddog
Subject: RE: FTE Perf - Long rods and more.

the acceleration is not equal at 135 and 45 degrees. the velocity is equal at 0,90,180,270. otherwise i think you are reading it right.

sleddog

- ----------
From: Dave & Debby Anderson[SMTP:danders uswest.net]
Sent: Friday, December 11, 1998 1:49 AM
To: perf-list ford-trucks.com
Subject: Re: FTE Perf - Long rods and more.

>nice post Muel,

I agree, very well written.

Sleddog - I picked up your rod ratio spreadsheet some time ago but until
recently haven't had been able to spend any time with it. I haven't tried
to understand the formulas just yet (wish I'd paid more attention in
geometry class all those years ago) but in comparing the calculated values
of two different rod lengths I'm seeing that piston velocity is the same at
0, 90 and 180 degrees and piston acceleration is the same at 45 and 135
degrees, regardless of rod length.

The greatest difference in piston velocity is at 45 and 135 degrees, when
acceleration is equivalent. Since the return stroke from 181 to 360 is a
mirror image of 0 to 180 it would appear that the longer rod increases
piston velocity from 90 deg ATDC to 90 deg BTDC with a corresponding loss in
the 90 degrees both before and after TDC. I'll chew on this a while longer
but for now I gotta admit it doesn't make sense. I would think that the
effect of the increased rod length would cause the same dwell at BDC as it
does at TDC and the acceleration increase would have to occur between these
two points, reaching a maximum at 90 and 270 degrees. Am I misreading the
spreadsheet?

Chris - re calculating effective cr; given the limits on how steep a flat
tappet lobe ramp can be made I understand that port flow is effectively cut
off somewhere before the valve actually becomes fully closed. Do you know
if there a generally accepted lift at which this takes place or do
differences in valve seat widths and angles make for too many variables to
permit generalizations that are of any use?

Dave




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

------------------------------

Date: Fri, 11 Dec 1998 10:46:24 -0500
From: am14 daimlerchrysler.com
Subject: FTE Perf - C/R

Chuck Stevens writes: >>The difference is in the heads.........Chuck

And the deck heighth???????!!!! Right????????

Azie
Ardmore, Al.


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

------------------------------

Date: Fri, 11 Dec 1998 11:00:37 -0500
From: Sleddog
Subject: RE: FTE Perf - C/R

yup, and the deck heights. also the pistons went from single wybrows to double eyebrows (flattops) to dished pistons.

sleddog

- ----------
From: am14 daimlerchrysler.com[SMTP:am14 daimlerchrysler.com]
Sent: Friday, December 11, 1998 10:46 AM
To: Perf-list ford-trucks.com
Subject: FTE Perf - C/R

Chuck Stevens writes: >>The difference is in the heads.........Chuck

And the deck heighth???????!!!! Right????????

Azie
Ardmore, Al.


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



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

------------------------------

Date: Fri, 11 Dec 1998 17:47:50 -0500
From: am14 daimlerchrysler.com
Subject: FTE Perf - C6

Sleddog: I was off work yesterday and ran across an old friend that I
haven't seen in a while. He is a retired FOMOCO transmission Guru. We
discussed your tranny in great detail. The only thing that we both agree
on is the "sprague" (one way) clutch in the very rear of the main case is
bad. We discussed one other possibility, but kinda ruled it out, and that
was melted (welded together) clutch pack. Either one front or rear, but
like I said we kinda ruled this out, but neither of us was really sure. We
always got back to the one way clutch as binding. Either way, it is a
complete teardown and rebuild.

Sorry.

Azie
Ardmore, Al.


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

------------------------------

Date: Fri, 11 Dec 1998 18:39:28 -0500
From: Sleddog
Subject: RE: FTE Perf - C6

ok, anyone know if the sprag is something that high perf versions are
available? or only stock units.

well, i will be doing a teardown when i can, maybe in feb as i am too busy
at this point. will let everyone know what i find. thanks for all the
help.

sleddog

- ----------
From: am14 daimlerchrysler.com[SMTP:am14 daimlerchrysler.com]
Sent: Friday, December 11, 1998 5:47 PM
To: Perf-list ford-trucks.com
Subject: FTE Perf - C6

Sleddog: I was off work yesterday and ran across an old friend that I
haven't seen in a while. He is a retired FOMOCO transmission Guru. We
discussed your tranny in great detail. The only thing that we both agree
on is the "sprague" (one way) clutch in the very rear of the main case is
bad. We discussed one other possibility, but kinda ruled it out, and that
was melted (welded together) clutch pack. Either one front or rear, but
like I said we kinda ruled this out, but neither of us was really sure. We
always got back to the one way clutch as binding. Either way, it is a
complete teardown and rebuild.

Sorry.

Azie
Ardmore, Al.


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




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

------------------------------

End of perf-list-digest V1 #169
*******************************

....


To access the rest of this feature you must be a logged in Registered User Of Ford Truck Enthusiasts

Registration is free, easy and gives you access to more features.
If you are not registered, click here to register.
If you are already registered, you can login here.

If you are already logged in and are seeing this message, your web browser is blocking session cookies. Change your browser cookie settings to allow session cookies.




Advertising - Terms of Use - Privacy Policy - Jobs

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford is a registered trademark of the Ford Motor Company.