Hi guys ,
i have not searched it to verify but i have some 3xv-50 barrels that i can try and do a port map for anyone that is interested . I can try and copy the flange adaptor too . I asked my tuner if there was any porting that could be improved upon and he told me to leave them as they were good enough as is .
cheers
I for one Neal would be interested in seeing a port map of the spr cylinders mate! It would be good to compare figures against my 92 sp cylinders!
Cheers,
Dan
I would like to have a look at the map Neal
No problem , after work tomorrow I will give it a bash
Is it the same as the 3XV2 SP port map? or has it been improved over the years?
I have given up trying to rub the ports with a pencil and my marking blue trick is not working either . I will try again .
I have been looking a stock 3xv00 barrels , i see that the powervalve protrudes a little into the ex port on the upper right hand corner . It looks like it blocks off the rhs extra exhaust port when fully open . Is that right ?
Comparing the 2 different barrels visually , you can see that the 50 barrel has more exhaust area than the 00 barrels .
The inlet boost port seems bigger on the 50 barrel as it is split in 2 . The 00 barrel tapers from the base of the barrel smaller to the side wall .
just rubbed my ports with a pencil, l/h upper cylinder was done with A4 paper,clear but not as accurate as the r/h lower cylinder that was done with tracing paper,had to reverse the tracing paper so it didn't pick up all the pencil marks!!
R cylinders tuned by Martin to (almost) SP spec... :)
r/h lower cylinder....... ;)
Were the powervalves tuned too ?
yeh, the powervalves were modded to match the main,and sub exhaust ports... :)
Any way you look at it that cylinder is severely lacking in blowdown angle area. Opening 80 deg ATDC is a bit OTT.
EEKNOWS, i'm assuming you're referring to the l/h upper cylinder? it is a rough trace indeed,but the outline shape of the exhaust port is quite different to the r/h lower cylinder,i wouldn't take too much notice of the figures either,i've just re-measured using my vernier gauge,and the exhaust ports are 26mm from the top of the cylinder....... :(
Neal, did you ever get anywhere with the map?
Want to send my spare cyl's for plating and porting at some point. Would be interesting to look at the -50 map.
Is there an accurate SP port map available from anybody else?
Yeah crank it owuld be interesting to see the port map on the -50 barrells, then we can copy it to our R heads....
Yup, thats what Im thinking. Not sure if the -50 with the tri-power valves will be possible to replicate on the R barrels.
SP may be the way to go.
simply blueprinting the barrel to casing and making sure your gasket doesnt get in the way, then cleaning up your inlet ports and a little to the rearmost port Chamfer and clean up, you can leave the inlet heights alone
then chamfer the exhaust and clean it out opening a little, set height to 26.5, a TZ is 25.3, you dont want to go there. side exhaust ports open a little and chamfer
that'll work a charm, then there's room for getting clever later.
thats it paul. not to much work on port heights, widening them will give more torque.
crank we can do some work and get those ponies screaming, what do you say?????
Wayne, do you have a porting tool (dremel) at your shop?
i sure do crank, you know my business, i do porting & gas flowing of head etc..... Hello........
Quote from: zoomzoom on January 24, 2013, 12:32:33 PM
i sure do crank, you know my business, i do porting & gas flowing of head etc..... Hello........
further to last post on cranks 3m1 thread.... now i really want to meet you!!!! ;)
that's handy to know, i want lessons! do you drink beer on hot nights?
Paul youll find me in speed and sound Mag, My company is called Elite Performance Centre.......
What I can do as a BEEG favour is sending a spare barrel up to Scott for you guys to look at . The deal is if I don't get it back I will do a track day with you guys and T bone you at the end of the straight . 1 by 1 at a time !
nice site, fair play to you
you didn't answer my question, i'm gonna hit the missile launch button in 5... 4.... 3....
Quote from: Paul on January 24, 2013, 12:43:49 PM
Quote from: zoomzoom on January 24, 2013, 12:32:33 PM
i sure do crank, you know my business, i do porting & gas flowing of head etc..... Hello........
further to last post on cranks 3m1 thread.... now i really want to meet you!!!! ;)
that's handy to know, i want lessons! do you drink beer on hot nights?
Paul im not a beer fan, but put a red square energizing in my hand and well drink all night, no matter how hot or cold it is.
Quote from: zoomzoom on January 24, 2013, 01:12:05 PM
Paul im not a beer fan
And you call yourself a South African :o ;D
Quote from: Neal on January 24, 2013, 12:58:54 PM
What I can do as a BEEG favour is sending a spare barrel up to Scott for you guys to look at . The deal is if I don't get it back I will do a track day with you guys and T bone you at the end of the straight . 1 by 1 at a time !
Wow, Neal that's a hell of a favour!!
Aren't those close to becoming "unobtanium" parts?
Neal. that would be awesome, is that our " your going away" present?? ha ha
eish , i said loan guys ! I will drop it with Paul on the weekend . The rules are simple - share the info with us all .
eish Neal. i meant "the loan of the barrel" is our present, we'll check it out with scott and return it in its original form, no extra mods done. hows that?
neal, your spare 50 barrels are they worked like on the bike or what, like james's
To me they look slightly touched on the inlet of the transfers - i will show you . The ones on the bike look untouched to me .
James' bike has TZ barrels on it .
So.....anybody with an SP port map to share??
This one has been around for ages, taken from a 91 SP I think.. don't worry too much about the outline of the ports, they had large chamfers which affects the shape on the paper, but the measurements are accurate. Generally the transfers are more than 38.5mm from the cylinder top, but these were a little higher, also the exhaust port is normally only 41mm wide.
(https://pure2strokespirit.net/forums/proxy.php?request=http%3A%2F%2Fi368.photobucket.com%2Falbums%2Foo127%2Fmartin1877jan%2FportmapSP.jpg&hash=84ee728ad2061ade90cc540ccacd2383189883ca)
This one is also fairly common..91 3XVR-SP
Yeah that last one is not accurate sadly. It looks like the vertical distances have been measured off the port rubbing rather than off the cylinder. So the chamfers have been included.
Dan