Your donations help keep this valuable resource free and growing. Thank you.
|
Billet FBS cylinder heads |
Post Reply | Page <1 3456> |
Author | |
74Bubblefender
AMC Addicted Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
Post Options
Thanks(0)
|
Hey is Andy still making these? I just got off the phone with Fred Brewer and Fred said something about Andy having a hard time finding someone to machine these. I cant remember all the specifics about what Fred told me but I would love to learn more about them.
Edited by 74Bubblefender - Nov/05/2012 at 12:41pm |
|
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
|
DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
Post Options
Thanks(0)
|
Has there ever been any progress on these ?
|
|
Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
|
|
74Bubblefender
AMC Addicted Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
Post Options
Thanks(0)
|
Yes, Fred sent me his last heads to copy and reproduce. Since then nothing new.
|
|
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
|
Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
Post Options
Thanks(0)
|
Not to be negative, but that will be one expensive piece of high silica Aluminum.
Billet Aluminum such as 6061 T651 grow at over twice the rate of cast iron.
High silica Aluminum can be equal to iron if thermal coefficent of expansion.
A properly fitted (cold) piece of 6061 might shear pins and or break a block
when warmed to 200 deg F.
Our billet 155 cid 6061 HD based motors grow about .033" from the crank CL to the head deck
from a 60 deg F start up to fully warmed up. This is a big problem if you have dissimilar materials
like an iron block and a billet aluminum head.
I had to address this problem in my billet manifold, it has high silica aluminum in several key parts.
|
|
Gremlin Dreams
|
|
jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
Post Options
Thanks(0)
|
^so cast aluminum is more stable, has lower expansion/contractaction rates than the typical aluminum billet material? Are billet aluminum cylinder blocks also usually 6061? I know forged pistons typically expand/contract much more than cast pistons, I hadn't really thought about billet blocks/heads having this problem too. |
|
71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
|
Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
Post Options
Thanks(0)
|
.0000124 inches per degree F.
Multiply by the length of the head and the temp change.
Cast aluminum is generaly between 5 and as high as 12 percent silica.
Manifolds and heads designed to mate to iron motors, also cast pistons
are high in silica content to closely match the groth rate of the block
and or heads.
So the answer is yes. It's just like pistons.
Billet race blocks and cases are usualy made of 7075
but some are like our HD based motors and are 6061.
This is ok since the heads are likely the same material.
So a 22" long head will see a seeing a temprature rise of 100 degrees
will grow .0273" over it's length. The growth is 3D, with and height also change.
The iron block will grow a little less than half that value.
This can and will put fretting and tension stresses on things like head bolts
and gaskets. Like freezing water in a block it can cause cracks.
This is why edelbrock and others cast their heads and manifolds even in todays
age of fast CNC machining.
I had more than a little trouble chasing down high silica material for the head plates
and water crossovers for my manifold.
Growth and expansion were figured into the mating parts like runners and plenum.
Dissimilar materials cause havoc in anything that changes temprature.
Ever wonder how much an airplane grows or shrinke with temprature?
Having been in the USAF and worked on C-130s I can tell you the change
is immense when the heat of the day hits a cold airframe in the morning.
|
|
Gremlin Dreams
|
|
jtsllc1
AMC Addicted Joined: Sep/24/2013 Location: ORFORDVILLE WI Status: Offline Points: 1037 |
Post Options
Thanks(0)
|
|
|
JTSLLC1
|
|
jtsllc1
AMC Addicted Joined: Sep/24/2013 Location: ORFORDVILLE WI Status: Offline Points: 1037 |
Post Options
Thanks(0)
|
Last set of Fred Brewer Racing Heads New still
in box. Ported ,valves T&D rocker system. Sheet metal tunnel ram intake
made for 2 4 4bl carbs. Nice and rare parts 4200.00 Seller Phone Number: 3146600455 |
|
JTSLLC1
|
|
jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
Post Options
Thanks(0)
|
What runner size, valve size, and what kind of air do they flow. What shape exhaust port?
|
|
jtsllc1
AMC Addicted Joined: Sep/24/2013 Location: ORFORDVILLE WI Status: Offline Points: 1037 |
Post Options
Thanks(0)
|
The rumor is these are Andys heads that he copied to make the billet heads to with stand the 2800 HP... I think the flow is in the 430 CFM and 300 CFM... Just call the number and ask.... Leon had a pair and these might have been his at one point...Maybe he will chime in and give some flow numbers
|
|
JTSLLC1
|
|
Post Reply | Page <1 3456> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |