geez you have some work to do.
but i think your the write man for the job.
whats the difference between the two heads,main differences apart from looks.
westi what the
1,610 posts · joined Aug 2005 ·
down sharon.
What has Dave Been Up To? 29th AUG 2015: 10.66@126.09mph!!
LIFE IN THE LOW LANE All people have the right to stupidity but some abuse the pr
2,534 posts · joined Mar 2007 ·
Noice Dave.
ACCEPT THAT SOME DAYS YOU ARE THE PIDGEON AND SOME DAYS YOU ARE THE STATUE
Alder Outlaws VW Racing - check it out on fb!!
Alder Outlaws VW Racing - check it out on fb!!
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Between these and the Pauter?westi wrote:geez you have some work to do.
but i think your the write man for the job.
whats the difference between the two heads,main differences apart from looks.
Primarilly the port size,
but the Pauter is much stronger in the rocker box support.
The Pauter comes rough CNC'd at the port flange,
and the holes are way big, exhaust too.
Also these have a different inlet approach angle
and the ports are better being closer together.
westi wrote:That's mad Alan.
westi what the
1,610 posts · joined Aug 2005 ·
sweet thanks dave
down sharon.
mactaylor Custom Title Time!
1,005 posts · joined Aug 2007 ·
yeah thanks why the change other than the obvious?
EVERLAST CONCRETE TANKS
1800 552 123
1800 552 123
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Nothing is obvious is it?!mactaylor wrote:yeah thanks why the change other than the obvious?
Wanting to go faster?
My plan for the current heads was to fill in the ports with aluminium plates,
to try and increase the air speed,
but other than having the car in pieces for a while,
and it being a comprimised result unless I make a new manifold,
and the exhaust hole also being too big,
and the chamber needing more work,
and....
I clean slate just seemed like a better way to go.
I wanted these about a year or so ago so saved up my gold coins for a whole year.
Hopefully next year I can get the rockers and covers before Warwick 2009.
These will fit some old Autocraft inlet manifolds that I have,
and the exhaust will just be a flange change.
westi wrote:That's mad Alan.
matberry Moderator Go hard or go home
8,114 posts · joined Mar 2006 ·
Go Volksie Go
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Made and fitted some inlet seats today.
They have .007" interference fit.
Material is Aluminium Bronze,
which has a high tensile strength,
and expands at a rate close to the head material.
The heads are put in the oven at 200 degrees C,
and I use this mandrel to fit the seats:
All done!
Ready to rough out the inlet ports.
They have .007" interference fit.
Material is Aluminium Bronze,
which has a high tensile strength,
and expands at a rate close to the head material.
The heads are put in the oven at 200 degrees C,
and I use this mandrel to fit the seats:
All done!
Ready to rough out the inlet ports.
westi wrote:That's mad Alan.
matberry Moderator Go hard or go home
8,114 posts · joined Mar 2006 ·
Looks good Dave.
Bet you love being able to do this at home these days.
Bet you love being able to do this at home these days.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
mactaylor Custom Title Time!
1,005 posts · joined Aug 2007 ·
looken good dave,hope you dont make muffins at the same time as heating your heads, makes them taste funny! hope you dont mind me asking on youre thread but want to know poundage valve springs i should put in my type 4 with 6mm valve stems and 7000rpm about a 280 deg @ 50 thou cam gotta order some this week, thanks
EVERLAST CONCRETE TANKS
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dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Hi Mac,
it DOES depend on the profile, but if it is a stable profile,
and less than 600 lift I would aim to shim the springs about 80 to 100 from bind,
and use a quality dual spring in 1.25" Outside diameter.
Make sure you use a rev limiter to cover your arse.
it DOES depend on the profile, but if it is a stable profile,
and less than 600 lift I would aim to shim the springs about 80 to 100 from bind,
and use a quality dual spring in 1.25" Outside diameter.
Make sure you use a rev limiter to cover your arse.
westi wrote:That's mad Alan.
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Current sponsors:
Engine with the short ram tubes.
Engine with the short ram tubes.
westi wrote:That's mad Alan.
mactaylor Custom Title Time!
1,005 posts · joined Aug 2007 ·
thanks dave just to confirm is that 80 - 100 pounds or 80 -100 thou from bind a standard type 4 spring is about 80 pound at 500 thou and about 30 pound at installed height. im putting in beehive springs just for fun see if it makes much difference, thanks again
EVERLAST CONCRETE TANKS
1800 552 123
1800 552 123
matberry Moderator Go hard or go home
8,114 posts · joined Mar 2006 ·
80 - 100 thou👍
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Yeah Matt is right.
I used to have around 140 seat and 350 nose pressure.
Beehive may struggle with that, but with light valve it should be fine
as long as the cam profile is not a bogus one.
I used to have around 140 seat and 350 nose pressure.
Beehive may struggle with that, but with light valve it should be fine
as long as the cam profile is not a bogus one.
westi wrote:That's mad Alan.
mactaylor Custom Title Time!
1,005 posts · joined Aug 2007 ·
yeah thanks hoping to get 100-330 somewhere round therewill see thanks both of you! how much does it cost to be a sponsor of the muffin man!!!!
EVERLAST CONCRETE TANKS
1800 552 123
1800 552 123
westi what the
1,610 posts · joined Aug 2005 ·
loverly work as always.
those heads rock.
dave what kind of differences in flow(cfm wise ) if any. does temperater make for the head flow benches.
and what kind of differences have you seen with venturi's.
pagey's got me thinking.we spoke the other night and i'm tinkering again.
those heads rock.
dave what kind of differences in flow(cfm wise ) if any. does temperater make for the head flow benches.
and what kind of differences have you seen with venturi's.
pagey's got me thinking.we spoke the other night and i'm tinkering again.
down sharon.
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
The superflow bench has a correction for the temp as it rises from the suction of the pump and where it blows out.
Higher temps have correction factors that reduce the inlet flow, and increase the exhaust.
Venturis in the carb or in the port near the seat?
The carb will most likely limit flow with a smaller venturi,
but larger vents may not let the carb work properly
(weber says 42mm is biggest for a 48IDA to get acceptable tuning through the range...bigger carb is different).
Have a look at some flow tests we did some years ago for interests sake:
Higher temps have correction factors that reduce the inlet flow, and increase the exhaust.
Venturis in the carb or in the port near the seat?
The carb will most likely limit flow with a smaller venturi,
but larger vents may not let the carb work properly
(weber says 42mm is biggest for a 48IDA to get acceptable tuning through the range...bigger carb is different).
Have a look at some flow tests we did some years ago for interests sake:
westi wrote:That's mad Alan.
westi what the
1,610 posts · joined Aug 2005 ·
cheers
you can never have to much info.
you can never have to much info.
down sharon.
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
I'll try to find the correction number for each temperature.
For some reason the sf600 bench had no temp change factor.
Perhaps the temp difference was not present due to the electric motors being out of the air flow.
On the 110 bench the air got very hot at low lift/low flow.
For some reason the sf600 bench had no temp change factor.
Perhaps the temp difference was not present due to the electric motors being out of the air flow.
On the 110 bench the air got very hot at low lift/low flow.
westi wrote:That's mad Alan.
0 posts · joined Feb 2005 ·
....love the Muffin Man stickers..... 👍
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
I needed to open up the exhaust seat hole.
So I made up some jigs to hold the head at a nine and a half degree angle.
These stepped spacers locate on the valve guide boss, and spring seat.
A pair of 10mm socket head cap screws go down and clamp the head down to the drill press table.
I did a bit of trial and error with some home made fly cutters.
The cutters locate on a dummy valve guide that taps lightly into the head.
In the end there are three steps.
The first cutter I made has a 2mm radius on the end, and a 30 degree angle.
The plan for this one is to give a good top angle to the valve seat.
Here is the home made cutter, and the finished hole showing the radius.
So I made up some jigs to hold the head at a nine and a half degree angle.
These stepped spacers locate on the valve guide boss, and spring seat.
A pair of 10mm socket head cap screws go down and clamp the head down to the drill press table.
I did a bit of trial and error with some home made fly cutters.
The cutters locate on a dummy valve guide that taps lightly into the head.
In the end there are three steps.
The first cutter I made has a 2mm radius on the end, and a 30 degree angle.
The plan for this one is to give a good top angle to the valve seat.
Here is the home made cutter, and the finished hole showing the radius.
westi wrote:That's mad Alan.
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
The other two steps are the seat hole its self,
and the inside of the seat hole so that the seat hole-cutter does not have to cut such a wide surface.
Here you can see how small the casting is in the throat.
The small hole was done with a guide boss cutter that I made in the early nineties,
for my first set of new heads and dual springs.
Once this was done,
I used larger cutter to make the actual seat hole.
The size is just larger than the proposed 39 to 40mm exhaust valve. (not sure yet)
I made this one 20 years ago to cut a hole in a stock head for a 40mm inlet valve.
But it worked great for this,
with just a light sharpen.
The tooth on the cutter is square,
it is just the angle of the pic that makes it look pointed.
It makes the seat hole flat on the bottom.
and the inside of the seat hole so that the seat hole-cutter does not have to cut such a wide surface.
Here you can see how small the casting is in the throat.
The small hole was done with a guide boss cutter that I made in the early nineties,
for my first set of new heads and dual springs.
Once this was done,
I used larger cutter to make the actual seat hole.
The size is just larger than the proposed 39 to 40mm exhaust valve. (not sure yet)
I made this one 20 years ago to cut a hole in a stock head for a 40mm inlet valve.
But it worked great for this,
with just a light sharpen.
The tooth on the cutter is square,
it is just the angle of the pic that makes it look pointed.
It makes the seat hole flat on the bottom.
westi wrote:That's mad Alan.
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
This is the finished recess, ready for a seat.
GREEN arrow is where the boss cutter opened out the throat.
BLUE arrow is the seat hole location.
RED arrow is the radius up to the chamber wall.
Yellow arrow is just short of the bore seal surface.
GREEN arrow is where the boss cutter opened out the throat.
BLUE arrow is the seat hole location.
RED arrow is the radius up to the chamber wall.
Yellow arrow is just short of the bore seal surface.
westi wrote:That's mad Alan.
13BVW Seriously Crusin Dubber
151 posts · joined Sep 2005 ·
Dave all this reminds me of "The worlds Fastest Indian"😂
13BVW 11.80@114mph
Dasdubber DAS Resto Haus
5,746 posts · joined Aug 2002 ·
I can certainly see why good quality head work costs so much. I wonder how many hours you'll have invested in these heads by the time they are done Dave?? Lots I am guessing!
Al
Al
LIFE IN THE LOW LANE All people have the right to stupidity but some abuse the pr
2,534 posts · joined Mar 2007 ·
A fair few cups of coffee and a few muffins I'd expect....
ACCEPT THAT SOME DAYS YOU ARE THE PIDGEON AND SOME DAYS YOU ARE THE STATUE
Alder Outlaws VW Racing - check it out on fb!!
Alder Outlaws VW Racing - check it out on fb!!
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
Made up the Exhaust seats today:
...and shrunk them in:
Supoib.
...and shrunk them in:
Supoib.
westi wrote:That's mad Alan.
Stanley I guess the reward is in the doing of it
4,523 posts · joined Mar 2003 ·
Nice work Dave.
I can't wait for the die grinder to make an appearance
I can't wait for the die grinder to make an appearance
dangerous 23 Windows of Awesome
5,901 posts · joined Jan 2005 ·
This is the 5th pair of heads that I have done from scratch over my racing years.Dasdubber wrote:.I wonder how many hours you'll have invested in these heads by the time they are done Dave?? Lots I am guessing!
Al
My first set of 044 castings are still on Wally's "bugger" turbo drag beetle.
I did a set of super flow astings after that (first 10's),
then AF bugpack heads when I went up to 4"(101.6mm) bore in 1995,(got into the nines with those)
and then my current Pauter heads.
This time the train of thought will be totally new,
when planning out the port and chamber shapes,
being that the plan is purely normally aspirated.
I am up to about 15 hours so far.
It would take a lot less time with equipment and machines designed for head work.
And you can purchases valve seats and guides, but you know me,
I like to do everything myself if I can.
Only the final seat cutting will be farmed out
because I no longer work for someone that has the tooling.
My Pauter heads took about 40 hours of work to get ready,
and I would say that these will be about 50 to 60 hours,
being that the chambers and ports are castings,
whereas the Pauter had rough CNC holes and chambers to begin with.
This time guesstimate does not include the many hours
of looking at the heads and planning ideas
as I sit with them on the couch, in bed, and on the toilet,
rolling them over and dreaming about a plan of attack.
You can probably double the hours if you include that.
westi wrote:That's mad Alan.