boys and girls..
the 1000 engine is in its final stages and will get its shakedown in 2 weeks time at the speedtrials, lake gairdner, south OZ..
Im riding the bike if i can get the time off work and we are also taking a T500 down..
i will be taking lotsa pics and hopefuly can get the helmet cam sorted..
this was a test barrel... one cylinder on the dyno was making about 68hp at the rear at 7000 rpm and 45 ft/lb tourque..
the cracks are due to impurities in the alloy.. high iron content....
that has been sorted and the new pour was perfect!!
Last edited by shannon on Sat Apr 11, 2009 3:41 am, edited 1 time in total.
yep, extremely impressive, and the interesting thing is that those exhaust ports are smaller than the tr750.. less than 33% of the circumfrnce... ideally you could push the exhaust are to over 80% of the area if there is enough ring support and what you see there is close to 60% with room for more now that that water passages have been moved.
each inlet holds a block of 2 x rgv250 reed assemblies and carbs are 44mm mikuni's.
That's an impressive piece of work. It seems to be the logical next step in Brett's development with the welded block. The liner design is similar, as is are the ports to the crankcase for example - a logical progression.
I didn't realize that RGV reed cages were so large. I only have RS250 Aprilia cages and they are wide but not very tall and their port area is not as large as one might expect. Those look to be much larger. But with two per port that's a lot of port area. What do the intake manifolds look like?
I like those boysen ports between the intakes and transfer passages. Did those prove to be useful on the dyno in broadening the powerband? I have read mixed reviews on them. It seems that some engines respond well and on others it makes no difference.
Not that you need more power, but did you consider rotating the cylinders to a straight forward position? It makes the ports more effective because the gas gets a straighter shot.
It would require a whole new pattern and I have no idea how the heck that would be created. Even more work I guess.
Good luck and keep us posted
teazer
Last edited by tz375 on Tue Feb 17, 2009 4:17 pm, edited 1 time in total.
Lovely stuff!
Any plans to market the GT1000 blocks and heads?
Who is doing the 1000 pistons?
Any pictures of the cylinder head(s)???
If you make these available, I'll take two!!
Kris Bernstein wrote:Lovely stuff!
Any plans to market the GT1000 blocks and heads?
Who is doing the 1000 pistons?
Any pictures of the cylinder head(s)???
If you make these available, I'll take two!!
Kris Bernstein
You are on the way to build a 2000 cc ? on line or V engine?
Oh, I re-read your comments and no, I have two GT/TR750 motors I'm using for road racing and would like to get two of these top end assemblies.
I am also thinking Shannon might want a supplier/distributor for North America if he goes into full production.
These motors will piss off a bunch of otherwise smug TZ750 racers, me thinks...=
Kris.. Not my handy work but a life long friend.
more info later, but it will get its full shakedown next weekend at lake gairdner ( the aussie equivalent of bonneville)
I have a modified seeley TR500 that i am taking, along with the 1000 that i will be throwing a leg over..
If all things go well, then im sure that they might be available but not cheap.. the labour to make these has been countless..
I now have the basic core and pattern and I would like to keep a 750 version with some changes to port area, in particular the exhaust port.
Our racing laws and eligibility are fairly strict here so we cant get away with some of the stuff that you can.
anyways, must get off the computer.. busy trying to mount up a fuel pump to the TR.. the 38 mikuni's suck the bowls dry in under a minute at full noise. probably not a good thing on a 7 mile straightaway!!
Thanks for the update Shannon. Best of luck on the salt.
We may be blessed (or cursed) with more liberal rules about what is "vintage" but it does make for some interesting development.
We to run an original Seeley 750 that ran at Daytona in 1974. Always on the look out for go fast goodies.
Keep us in the loop!
=