chris gt40

[Jim Cowden]

That looks neat.
I was never happy with the amount of pipe work on mine even though I think it likes the length , you have a good solution Chris.

Let me know how it goes I might be interested in doing something similar.

Good work
I havnt forgotten about the springs give me a week.

Jim

 

[Dave]

Great work Chris....lots of fab work which looks cool. Will be interesting to see what noise level you get from those mufflers.....might have to pinch that idea myself........

 

[chris]

hello jim take as long as you like i am very slow at this caper
from what i can see of other build logs have got to work out
extractors now and they are hurting my head trying to figure out
wich one first hope to test out mufflers on a 393 cleveland with
same heads as mine on the dyno in a few weeks.
dave thanks for the comments that is what this site is good
for selecting different ideas to use and change as required
my setup is not re packable without major surgery so may be
something to think about but it does not take up a lot of room
out back
chris

 

[chris]

hello finished off heat sheild tonight i am after some help with
exhaust on sbf firing13726548 for cicular motion in collectors
is this how it is meant to look like
2 3 7 1
5 8 6 4
how do you go about selecting wich exhaust is made first and
how to route them to collectors in what order? i am strugling
with this please help
thanks
chris

 

[Jim Cowden]

OK Goldsmith the jigs up, you keep telling me your no good at this, me thinks your fibbing.

Very neat Chris you have to be happy with that.

To finish it off you need to put it in a box and send it my way.

Jim

 

[Jimmy P]

Top drawer work Chris. Bloody nice job.....

 

[chris]

had a go at the exhausts today a lot of work most
of it tacked together need more bends
jim your standard of work is much higher than mine
so i doubt you would want the mufflers
chris

 

[chris]

last of photos did not load first time
chris

 

[chris]

hello everyone have spent last couple of weekends on exhaust
almost finished one side can get to all spark plugs easy
can only get primarys within about 60 mm of each other in length
ended up using spool gun to weld up two reasons poor eyesight
and two some gaps a little to big for me to tig
chris

 

[Clayton]

Looking good Chris,
Keep up the great work.

Clayton

 

[chris]

hello have been doing a bit of work on inlet as i have used all
of my bends for exhaust waiting for some more to arrive have
used 50 bends so far on exhaust
chris

 

[Jim Cowden]

Looking very smart Chris.
I bet you are hanging to fire her up.

60mm difference in pipe length is pretty good.
From memory I had 50-75mm.
It aint a perfect world.

Jim

 

[chris]

hello have done a little bit more on intake
port matched to heads
finaly tapped and bolted on throttle bodys
made levers and connected up linkage
just injectors and fuel rail to go
also made a radiater tank
chris

 

[chris]

have done a bit more set up posts for rails
pressed in bosses for injectors
trial fit injectors
now have to figure out how to make trumpets.
chris

 

[Jim Cowden]

Nice Chris.

Steve at Wollongong metalspinning has plenty of dies for trumpets.
If you want his # give me a call, he is cheap but they wont be as thick as the short ones you have on your manifold.
I cant see how you have attached them other than the tape, slip in fit ? maybe.
On mine I made 3mm flanges and had the trumpet pass through and I fuse welded them on the underside to make them look neat on the top side.

Jim

 

[chris]

thanks jim the trumpets are off the cobra so just there to check fit and
clearence i probably have to go from round at throttle body to oval with a dog leg to cross trumpets over so all help i really appreciate.
i assume there is a critical measuremnt for trumpet length to valve
for tune and power but hopefully i have enough power and will probably
go for what looks and performs ok and yes i will give you a call and get that number.
chris

 

[Jim Cowden]

A formula I use is 99000 divide by max rpm.
that will give a length from valve seat to end of trumpet.

It will give you the length in inches.
You might get it on your set up, my setup ended shorter because of the period look.

get a couple spare trumpets.
make a die out of timber to press down the the inside of the trumpet it will change the shape and give the transition.
You will need to plug the small end so the exit shape remains round.

If you want a dog leg you will need to probably do it in 2 parts.
I would work out your length first then look at the options.

Jim

 

[chris]

had a day off today for melbourne cup so made the trumpets
for the gt could not get to the length jim recommended so this
will have to do not sure how to filter them yet hopefully you blokes
will have some ideas for me.
chris

 

[Keith]

Hey Chris, your fabrication skills are amazing. There seem to be no machine shops left here in the UK that can do that sort of stuff, and we used to have thousands - perhaps they all emigrated :laugh:

One question: in your header design, you have elected to go upwards (from the ports) and rearwards level with valve covers and this seems to 'wrap' the valve covers with a lot of heat. How will you protect the valve train from excessive exhaust heat?

Good luck in the Melbourne mate..got a bob or two riding on it?

 

[David]

not sure how to filter them yet hopefully you blokes
will have some ideas for me.

Beautiful work as usual.

WRT filtering I considered sealing the clip against the engine and creating a giant airbox with filters in the sides.